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Wednesday, September 17, 2025
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  • AI
    Artificial Intelligence

    Unified multimodal access layer for Quora’s Poe using Amazon Bedrock

    Artificial Intelligence

    5 Strategic Steps to a Seamless AI Integration

    Artificial Intelligence

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    Artificial Intelligence

    How Amazon Finance built an AI assistant using Amazon Bedrock and Amazon Kendra to…

    Artificial Intelligence

    5 Reasons Why Vibe Coding Threatens Secure Data App Development

  • Apple
    Here’s how the iPhone 17 Pro vapor chamber actually works

    Here’s how the iPhone 17 Pro vapor chamber actually works

    Mac Studio M3 Ultra owners can’t install macOS Tahoe yet

    Mac Studio M3 Ultra owners can’t install macOS Tahoe yet

    Apple’s new generative AI ‘answer engine’ might arrive sooner than we initially thought

    Apple Intelligence’s required iPhone storage in iOS 26 is actually good news

    Apple’s F1 movie gets Blu-ray release date, limited edition steelbook

    Apple’s F1 movie gets Blu-ray release date, limited edition steelbook

    Are the icons in iOS 26 slanted or crooked?

    Are the icons in iOS 26 slanted or crooked?

    macOS Tahoe just made hotspotting to your iPhone easier than ever

    macOS Tahoe just made hotspotting to your iPhone easier than ever

    Apple’s first OLED MacBook could have a touchscreen display

    Apple’s first OLED MacBook could have a touchscreen display

    OWC Thunderbolt 5 Hub review: Affordable super 80Gbps port booster

    Kuo: Apple to launch touch screen Macs, starting with OLED MacBook Pro

    Kuo: Apple to launch touch screen Macs, starting with OLED MacBook Pro

  • Crypto
    BTC Struggles to Hold $115K Despite Dovish Fed Shift

    BTC Struggles to Hold $115K Despite Dovish Fed Shift

    Bitcoin Briefly Shoots Past $116K After Fed Cuts Rates

    Bitcoin Briefly Shoots Past $116K After Fed Cuts Rates

    Global Crypto Market‑Maker Keyrock Acquires Turing Capital to Launch Asset & Wealth Management Division

    Global Crypto Market‑Maker Keyrock Acquires Turing Capital to Launch Asset & Wealth Management Division

    Stablecoin Sector Smashes Past the $290 Billion Milestone

    Stablecoin Sector Smashes Past the $290 Billion Milestone

    Bitcoin Options Turn Cautious As BTC Longs Increase Size

    Bitcoin Options Turn Cautious As BTC Longs Increase Size

    Gold Hits $3,700 as Sprott’s Wong Says Dollar’s Store-of-Value Crown May Slip

    Gold Hits $3,700 as Sprott’s Wong Says Dollar’s Store-of-Value Crown May Slip

    Markets Eye Fed’s Rate Path With Crypto Facing Uncertain Spillover

    Markets Eye Fed’s Rate Path With Crypto Facing Uncertain Spillover

    Bitcoin Price Watch: Technical Tension Builds Near $117K Resistance

    Bitcoin Price Watch: Technical Tension Builds Near $117K Resistance

    Grove Anchors $50M Tokenization of Apollo Diversified Credit Fund (ACRDX) on Plume

    Grove Anchors $50M Tokenization of Apollo Diversified Credit Fund (ACRDX) on Plume

  • Gaming
    Late Review of The Callisto Protocol

    Late Review of The Callisto Protocol

    REDRAGON S101 GAMING KEYBOARD

    Logitech’s Pro X2 Superstrike offers haptic clicks and rapid trigger

    The Gotham Knights Platinum ALMOST HAD ME IN TEARS

    The Gotham Knights Platinum ALMOST HAD ME IN TEARS

    Logitech has announced an affordable 8 Nm direct drive racing wheel setup with full TrueForce support, along with some fancy trick pedals I want to try for myself

    Logitech has announced an affordable 8 Nm direct drive racing wheel setup with full TrueForce support, along with some fancy trick pedals I want to try for myself

    Pokemon Violet – WalkThrough – Episode 85

    Pokemon Violet – WalkThrough – Episode 85

    The most affordable rapid trigger gaming keyboard actually worth buying has somehow become an even better deal, now costing less than $40

    The most affordable rapid trigger gaming keyboard actually worth buying has somehow become an even better deal, now costing less than $40

    Forspoken Post-Game Review

    Forspoken Post-Game Review

    Subnautica 2 devs reveal the latest horrifying Leviathan to grace the deep sea: ‘It has 4 tentacles to grab, crush, swat, and terrify players’

    Subnautica 2 devs reveal the latest horrifying Leviathan to grace the deep sea: ‘It has 4 tentacles to grab, crush, swat, and terrify players’

    Sonic Frontiers Review Scores I Speak The Truth SEGA NEWS

    Sonic Frontiers Review Scores I Speak The Truth SEGA NEWS

  • Retro Rewind
    Retro Rewind: Game Players Issue 80 Magazine January 1996

    Retro Rewind: Game Players Issue 80 Magazine January 1996

    Retro Rewind: Video Game Trader Winter 2014

    Retro Rewind: Video Game Trader Winter 2014

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 57 April 1994

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

  • Tech Art
    Color theory explained

    Color theory explained

    MAGA Is Coming for the Arts!

    MAGA Is Coming for the Arts!

    Computer Art, Cyber Art, Multimedia Art, Digital Art Manipulation, Omni-Manipulation

    Computer Art, Cyber Art, Multimedia Art, Digital Art Manipulation, Omni-Manipulation

    How To Pick the Right Size/Resolution for your Art – Beginner Illustration Tips

    How To Pick the Right Size/Resolution for your Art – Beginner Illustration Tips

    HOW I DRAW DIGITAL ART USING CLIP STUDIO PAINT

    HOW I DRAW DIGITAL ART USING CLIP STUDIO PAINT

    How to Animate Characters inside Augmented Reality apps for Android in Unreal Engine 5

    How to Animate Characters inside Augmented Reality apps for Android in Unreal Engine 5

    Step By Step Vector Art A dog From Picture

    Step By Step Vector Art A dog From Picture

    Man Ray Was So Much More Than a Photographer

    Man Ray Was So Much More Than a Photographer

    Five New York City Art Shows to See Right Now

    Five New York City Art Shows to See Right Now

  • Tech Deals
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    Logitech G920 Driving Force Racing Wheel and Pedals, Force Feedback + Logitech G Driving…

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    Lenovo IdeaPad Laptop with Microsoft Office and 1TB Cloud Storage (1-Year)| 15.6 inch HD…

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    AC Adapter Charger Compatible with LaCie D2 Thunderbolt 2 3TB USB 3.0 3.5inch External…

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    MIXAGE 128GB MicroSDXC Memory Card U3 V30 A1 UH-I, 100MB/s Read 60MB/s Write 4K UHD for…

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    [5-Yrs Free Data Recovery] GIGASTONE 256GB SD Card, 4K Camera Pro, A1 V30 SDXC Memory…

    S101 4TB SSD SATA III 6Gb/s 2.5″ Internal Solid State Drive, Read Speed up to 550MB/sec,…

    S101 4TB SSD SATA III 6Gb/s 2.5″ Internal Solid State Drive, Read Speed up to 550MB/sec,…

  • Techs Got To Eat
    Spicy Chickpea Shakshuka Mug: 5-Minute Vegetarian Fuel

    Spicy Chickpea Shakshuka Mug: 5-Minute Vegetarian Fuel

    Bacon & Spinach Mug Quiche: 3-Minute Gourmet Breakfast

    Bacon & Spinach Mug Quiche: 3-Minute Gourmet Breakfast

    Cheesy Broccoli Rice Mug: 5-Minute Super Comfort Food

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    Top 10 Vegetarian Recipes for 2025: Easy and Nutritious Meals for Busy People

    Bacon Mug Lasagna: 5-Minute Microwave Meat Lover’s Dream

    Bacon Mug Lasagna: 5-Minute Microwave Meat Lover’s Dream

    Bacon Fried Rice Mug: 5-Minute Microwave Meal

    Bacon Fried Rice Mug: 5-Minute Microwave Meal

    Bacon & Cheddar Mug Biscuit: 2-Minute Savory Comfort

    Bacon & Cheddar Mug Biscuit: 2-Minute Savory Comfort

    Loaded Bacon Cheesy Potato Mug: 5-Minute Comfort Food

    Loaded Bacon Cheesy Potato Mug: 5-Minute Comfort Food

    Peanut Butter Banana Mug Muffin: 5-Minute Protein Snack

    Peanut Butter Banana Mug Muffin: 5-Minute Protein Snack

  • Tesla
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    Maoershan EVA Hard Protective Travel Case Carrying Pouch Cover Bag for Tesla Charging…

    iJDMTOY 2pc Set Track Racing Style Direct Fit Silver Aluminum Accelerator and Brake Foot…

    iJDMTOY 2pc Set Track Racing Style Direct Fit Silver Aluminum Accelerator and Brake Foot…

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    Shakas Motorcycle Accelerator Throttle Seat, Temperature Resistant High Strength Alloy…

    1pc Wolf Pack Badges Emblems 3D Logo Replacement for Tsla Cybertruck 2024 Car Truck…

    1pc Wolf Pack Badges Emblems 3D Logo Replacement for Tsla Cybertruck 2024 Car Truck…

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    CAR PASS Leather and 3D Air Mesh Universal Fit Car Seat Covers, for…

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    Tesla partners with Uber Freight to offer Tesla Semi electric trucks at discounts

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    Tesla Cybertruck and new Model 3 miss the top marks in latest crash tests

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  • UFO
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    Womens Roswell High School Hornets V-Neck T-Shirt

    SOJOS Retro Polarized Square Aviator Sunglasses for Women Men Vintage 70s UV400 Protection Shade SJ2609

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    Mind-Blowing Moon Encounters: Unveiling the UFO Mystery

    Mind-Blowing Moon Encounters: Unveiling the UFO Mystery

    300PC Gold Glitter and Sage Green Happy 40th Birthday Decorations for Men/Women Greenery 40th Birthday Confetti for Table Forty Party Decor Supplies

    300PC Gold Glitter and Sage Green Happy 40th Birthday Decorations for Men/Women Greenery 40th Birthday Confetti for Table Forty Party Decor Supplies

    FOREO Call It A Night Revitalizing & Nourishing UFO Activated Mask, 7 count

    FOREO Call It A Night Revitalizing & Nourishing UFO Activated Mask, 7 count

    Slim 360W Charger for Dell Alienware 16 18 Area-51 AA16250 AA18250 P52E P52E002 P141F P141F002 Gaming Laptop 19.5V 16.92A Power Supply Adapter Cord

    Slim 360W Charger for Dell Alienware 16 18 Area-51 AA16250 AA18250 P52E P52E002 P141F P141F002 Gaming Laptop 19.5V 16.92A Power Supply Adapter Cord

    #1 UFO Lawyer Exposes TRUTH About John Mack & Roswell | Danny Sheehan

    #1 UFO Lawyer Exposes TRUTH About John Mack & Roswell | Danny Sheehan

    The Hidden Truth: Government Insiders Suppress Positive UFO Data | Ryan Bledsoe  DSH

    The Hidden Truth: Government Insiders Suppress Positive UFO Data | Ryan Bledsoe DSH

    Mototo 4 PCS 63 Inch Giant Inflatable Alien 31.5 Inch Jumbo Blow Up Alien Green Inflatable Toy for Space Party Decoration UFO Theme Spaceship Party Birthday Halloween Easter Christmas Home, Green Blue

    Mototo 4 PCS 63 Inch Giant Inflatable Alien 31.5 Inch Jumbo Blow Up Alien Green Inflatable Toy for Space Party Decoration UFO Theme Spaceship Party Birthday Halloween Easter Christmas Home, Green Blue

  • AI
    Artificial Intelligence

    Unified multimodal access layer for Quora’s Poe using Amazon Bedrock

    Artificial Intelligence

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    Artificial Intelligence

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    Artificial Intelligence

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    Artificial Intelligence

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    Artificial Intelligence

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    Artificial Intelligence

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  • Apple
    Here’s how the iPhone 17 Pro vapor chamber actually works

    Here’s how the iPhone 17 Pro vapor chamber actually works

    Mac Studio M3 Ultra owners can’t install macOS Tahoe yet

    Mac Studio M3 Ultra owners can’t install macOS Tahoe yet

    Apple’s new generative AI ‘answer engine’ might arrive sooner than we initially thought

    Apple Intelligence’s required iPhone storage in iOS 26 is actually good news

    Apple’s F1 movie gets Blu-ray release date, limited edition steelbook

    Apple’s F1 movie gets Blu-ray release date, limited edition steelbook

    Are the icons in iOS 26 slanted or crooked?

    Are the icons in iOS 26 slanted or crooked?

    macOS Tahoe just made hotspotting to your iPhone easier than ever

    macOS Tahoe just made hotspotting to your iPhone easier than ever

    Apple’s first OLED MacBook could have a touchscreen display

    Apple’s first OLED MacBook could have a touchscreen display

    OWC Thunderbolt 5 Hub review: Affordable super 80Gbps port booster

    Kuo: Apple to launch touch screen Macs, starting with OLED MacBook Pro

    Kuo: Apple to launch touch screen Macs, starting with OLED MacBook Pro

  • Crypto
    BTC Struggles to Hold $115K Despite Dovish Fed Shift

    BTC Struggles to Hold $115K Despite Dovish Fed Shift

    Bitcoin Briefly Shoots Past $116K After Fed Cuts Rates

    Bitcoin Briefly Shoots Past $116K After Fed Cuts Rates

    Global Crypto Market‑Maker Keyrock Acquires Turing Capital to Launch Asset & Wealth Management Division

    Global Crypto Market‑Maker Keyrock Acquires Turing Capital to Launch Asset & Wealth Management Division

    Stablecoin Sector Smashes Past the $290 Billion Milestone

    Stablecoin Sector Smashes Past the $290 Billion Milestone

    Bitcoin Options Turn Cautious As BTC Longs Increase Size

    Bitcoin Options Turn Cautious As BTC Longs Increase Size

    Gold Hits $3,700 as Sprott’s Wong Says Dollar’s Store-of-Value Crown May Slip

    Gold Hits $3,700 as Sprott’s Wong Says Dollar’s Store-of-Value Crown May Slip

    Markets Eye Fed’s Rate Path With Crypto Facing Uncertain Spillover

    Markets Eye Fed’s Rate Path With Crypto Facing Uncertain Spillover

    Bitcoin Price Watch: Technical Tension Builds Near $117K Resistance

    Bitcoin Price Watch: Technical Tension Builds Near $117K Resistance

    Grove Anchors $50M Tokenization of Apollo Diversified Credit Fund (ACRDX) on Plume

    Grove Anchors $50M Tokenization of Apollo Diversified Credit Fund (ACRDX) on Plume

  • Gaming
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    Late Review of The Callisto Protocol

    REDRAGON S101 GAMING KEYBOARD

    Logitech’s Pro X2 Superstrike offers haptic clicks and rapid trigger

    The Gotham Knights Platinum ALMOST HAD ME IN TEARS

    The Gotham Knights Platinum ALMOST HAD ME IN TEARS

    Logitech has announced an affordable 8 Nm direct drive racing wheel setup with full TrueForce support, along with some fancy trick pedals I want to try for myself

    Logitech has announced an affordable 8 Nm direct drive racing wheel setup with full TrueForce support, along with some fancy trick pedals I want to try for myself

    Pokemon Violet – WalkThrough – Episode 85

    Pokemon Violet – WalkThrough – Episode 85

    The most affordable rapid trigger gaming keyboard actually worth buying has somehow become an even better deal, now costing less than $40

    The most affordable rapid trigger gaming keyboard actually worth buying has somehow become an even better deal, now costing less than $40

    Forspoken Post-Game Review

    Forspoken Post-Game Review

    Subnautica 2 devs reveal the latest horrifying Leviathan to grace the deep sea: ‘It has 4 tentacles to grab, crush, swat, and terrify players’

    Subnautica 2 devs reveal the latest horrifying Leviathan to grace the deep sea: ‘It has 4 tentacles to grab, crush, swat, and terrify players’

    Sonic Frontiers Review Scores I Speak The Truth SEGA NEWS

    Sonic Frontiers Review Scores I Speak The Truth SEGA NEWS

  • Retro Rewind
    Retro Rewind: Game Players Issue 80 Magazine January 1996

    Retro Rewind: Game Players Issue 80 Magazine January 1996

    Retro Rewind: Video Game Trader Winter 2014

    Retro Rewind: Video Game Trader Winter 2014

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 57 April 1994

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

  • Tech Art
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    Color theory explained

    MAGA Is Coming for the Arts!

    MAGA Is Coming for the Arts!

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    Computer Art, Cyber Art, Multimedia Art, Digital Art Manipulation, Omni-Manipulation

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    How To Pick the Right Size/Resolution for your Art – Beginner Illustration Tips

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    How to Animate Characters inside Augmented Reality apps for Android in Unreal Engine 5

    How to Animate Characters inside Augmented Reality apps for Android in Unreal Engine 5

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    Man Ray Was So Much More Than a Photographer

    Man Ray Was So Much More Than a Photographer

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    Five New York City Art Shows to See Right Now

  • Tech Deals
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    Transcend 2TB External SSD, Up to 1,050MB/s, Dual USB Flash Drive for Pixel10, Tesla,…

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    Lenovo IdeaPad Laptop with Microsoft Office and 1TB Cloud Storage (1-Year)| 15.6 inch HD…

    Lenovo IdeaPad Laptop with Microsoft Office and 1TB Cloud Storage (1-Year)| 15.6 inch HD…

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    MIXAGE 128GB MicroSDXC Memory Card U3 V30 A1 UH-I, 100MB/s Read 60MB/s Write 4K UHD for…

    [5-Yrs Free Data Recovery] GIGASTONE 256GB SD Card, 4K Camera Pro, A1 V30 SDXC Memory…

    [5-Yrs Free Data Recovery] GIGASTONE 256GB SD Card, 4K Camera Pro, A1 V30 SDXC Memory…

    S101 4TB SSD SATA III 6Gb/s 2.5″ Internal Solid State Drive, Read Speed up to 550MB/sec,…

    S101 4TB SSD SATA III 6Gb/s 2.5″ Internal Solid State Drive, Read Speed up to 550MB/sec,…

  • Techs Got To Eat
    Spicy Chickpea Shakshuka Mug: 5-Minute Vegetarian Fuel

    Spicy Chickpea Shakshuka Mug: 5-Minute Vegetarian Fuel

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    Bacon & Spinach Mug Quiche: 3-Minute Gourmet Breakfast

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    Bacon Mug Lasagna: 5-Minute Microwave Meat Lover’s Dream

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    Bacon Fried Rice Mug: 5-Minute Microwave Meal

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    Bacon & Cheddar Mug Biscuit: 2-Minute Savory Comfort

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    FOREO Call It A Night Revitalizing & Nourishing UFO Activated Mask, 7 count

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    The Hidden Truth: Government Insiders Suppress Positive UFO Data | Ryan Bledsoe DSH

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    Mototo 4 PCS 63 Inch Giant Inflatable Alien 31.5 Inch Jumbo Blow Up Alien Green Inflatable Toy for Space Party Decoration UFO Theme Spaceship Party Birthday Halloween Easter Christmas Home, Green Blue

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Home MIT Tech

MIT engineers make converting CO2 into useful products more practical | MIT News

MIT Tech by MIT Tech
November 13, 2024
in MIT Tech
Reading Time: 5 mins read
125
A A
0


David L. Chandler | MIT News
2024-11-13 05:00:00
news.mit.edu

As the world struggles to reduce greenhouse gas emissions, researchers are seeking practical, economical ways to capture carbon dioxide and convert it into useful products, such as transportation fuels, chemical feedstocks, or even building materials. But so far, such attempts have struggled to reach economic viability.

New research by engineers at MIT could lead to rapid improvements in a variety of electrochemical systems that are under development to convert carbon dioxide into a valuable commodity. The team developed a new design for the electrodes used in these systems, which increases the efficiency of the conversion process.

The findings are reported today in the journal Nature Communications, in a paper by MIT doctoral student Simon Rufer, professor of mechanical engineering Kripa Varanasi, and three others.

“The CO2 problem is a big challenge for our times, and we are using all kinds of levers to solve and address this problem,” Varanasi says. It will be essential to find practical ways of removing the gas, he says, either from sources such as power plant emissions, or straight out of the air or the oceans. But then, once the CO2 has been removed, it has to go somewhere.

A wide variety of systems have been developed for converting that captured gas into a useful chemical product, Varanasi says. “It’s not that we can’t do it — we can do it. But the question is how can we make this efficient? How can we make this cost-effective?”

In the new study, the team focused on the electrochemical conversion of CO2 to ethylene, a widely used chemical that can be made into a variety of plastics as well as fuels, and which today is made from petroleum. But the approach they developed could also be applied to producing other high-value chemical products as well, including methane, methanol, carbon monoxide, and others, the researchers say.

Currently, ethylene sells for about $1,000 per ton, so the goal is to be able to meet or beat that price. The electrochemical process that converts CO2 into ethylene involves a water-based solution and a catalyst material, which come into contact along with an electric current in a device called a gas diffusion electrode.

There are two competing characteristics of the gas diffusion electrode materials that affect their performance: They must be good electrical conductors so that the current that drives the process doesn’t get wasted through resistance heating, but they must also be “hydrophobic,” or water repelling, so the water-based electrolyte solution doesn’t leak through and interfere with the reactions taking place at the electrode surface.

Unfortunately, it’s a tradeoff. Improving the conductivity reduces the hydrophobicity, and vice versa. Varanasi and his team set out to see if they could find a way around that conflict, and after many months of trying, they did just that.

The solution, devised by Rufer and Varanasi, is elegant in its simplicity. They used a plastic material, PTFE (essentially Teflon), that has been known to have good hydrophobic properties. However, PTFE’s lack of conductivity means that electrons must travel through a very thin catalyst layer, leading to significant voltage drop with distance. To overcome this limitation, the researchers wove a series of conductive copper wires through the very thin sheet of the PTFE.

“This work really addressed this challenge, as we can now get both conductivity and hydrophobicity,” Varanasi says.

Research on potential carbon conversion systems tends to be done on very small, lab-scale samples, typically less than 1-inch (2.5-centimeter) squares. To demonstrate the potential for scaling up, Varanasi’s team produced a sheet 10 times larger in area and demonstrated its effective performance.

To get to that point, they had to do some basic tests that had apparently never been done before, running tests under identical conditions but using electrodes of different sizes to analyze the relationship between conductivity and electrode size. They found that conductivity dropped off dramatically with size, which would mean much more energy, and thus cost, would be needed to drive the reaction.

“That’s exactly what we would expect, but it was something that nobody had really dedicatedly investigated before,” Rufer says. In addition, the larger sizes produced more unwanted chemical byproducts besides the intended ethylene.

Real-world industrial applications would require electrodes that are perhaps 100 times larger than the lab versions, so adding the conductive wires will be necessary for making such systems practical, the researchers say. They also developed a model which captures the spatial variability in voltage and product distribution on electrodes due to ohmic losses. The model along with the experimental data they collected enabled them to calculate the optimal spacing for conductive wires to counteract the drop off in conductivity.

In effect, by weaving the wire through the material, the material is divided into smaller subsections determined by the spacing of the wires. “We split it into a bunch of little subsegments, each of which is effectively a smaller electrode,” Rufer says. “And as we’ve seen, small electrodes can work really well.”

Because the copper wire is so much more conductive than the PTFE material, it acts as a kind of superhighway for electrons passing through, bridging the areas where they are confined to the substrate and face greater resistance.

To demonstrate that their system is robust, the researchers ran a test electrode for 75 hours continuously, with little change in performance. Overall, Rufer says, their system “is the first PTFE-based electrode which has gone beyond the lab scale on the order of 5 centimeters or smaller. It’s the first work that has progressed into a much larger scale and has done so without sacrificing efficiency.”

The weaving process for incorporating the wire can be easily integrated into existing manufacturing processes, even in a large-scale roll-to-roll process, he adds.

“Our approach is very powerful because it doesn’t have anything to do with the actual catalyst being used,” Rufer says. “You can sew this micrometric copper wire into any gas diffusion electrode you want, independent of catalyst morphology or chemistry. So, this approach can be used to scale anybody’s electrode.”

“Given that we will need to process gigatons of CO2 annually to combat the CO2 challenge, we really need to think about solutions that can scale,” Varanasi says. “Starting with this mindset enables us to identify critical bottlenecks and develop innovative approaches that can make a meaningful impact in solving the problem. Our hierarchically conductive electrode is a result of such thinking.”

The research team included MIT graduate students Michael Nitzsche and Sanjay Garimella,  as well as Jack Lake PhD ’23. The work was supported by Shell, through the MIT Energy Initiative.

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