Slashing CO2

Founded: 2021

HQ: Paris, France

CO2 reborn.

Big Picture

Since the Industrial Revolution, we’ve been forced to accept a grim trade-off. In exchange for making the fuels, plastics, and countless other goods that enrich our lives, we’ve had to live with releasing harmful carbon emissions into the air. What if the process could work the other way around, capturing CO2 and infinitely upcycling it as fuel and many other of life’s necessities?

How it Works

Dioxycle’s platform uses water and electricity at low temperatures to convert carbon captured from the air or industrial emissions into fresh outputs. The gasses pass through a catalyst-loaded membrane that can convert CO2 into some of the highest-value chemicals like ethylene. The CO2-derived outputs can be used as-is or as carbon-free feedstocks for other chemicals, polymers, or fuel.

Unfair Advantage

Dioxycle’s membrane electrode assembly is designed to maximize CO2 conversion efficiency while minimizing system input costs. The core electrolyzer system fits into a shipping container, enabling modularity and co-location at industrial sites for on-site capture and conversion of CO2 gas into highly valuable chemicals and fuels at prices that make them competitive with fossil fuels. 


Gigatons of CO2

potentially upcycled by 2050


Sarah holds a PhD in Chemistry focused on electrochemical CO2 reduction from the University of Cambridge. Sarah has also completed double degrees in chemistry and economics at École Polytechnique, an MPhil in Chemistry at the University of Cambridge, and a Postdoc in the Jaramillo Lab at Stanford University.


David holds a PhD in Chemistry focused on the photochemical conversion of biomass to hydrogen from the University of Cambridge. David also completed postdoctoral research at the University of Cambridge, Collège de France, and Stanford University, where he was a Lindemann Trust Fellow.

Dioxycle raises $17 million for its electrolyzer that turns CO2 into ethylene


Gas diffusion electrodes, reactor designs and key metrics of low-temperature CO2 electrolysers

Nature Energy

Electrifying start-up

Nature Catalysis