Publication date: 6th November 2020
Electrocatalytic conversion of water and CO2 into fuels and chemicals has obtained large attention as potential routes for large scale energy storage and renewable feedstock. However, the scaling and intensifying electrocatalytic CO2 conversion faces many challenges. My work targets electrocatalytic reduction processes for upscaled reactors, operation at a typical current density > 200 mA/cm2.
One of the well-known issues at these high current density is the mass transport limitation of e.g. dissolved CO2 in aqueous phase. Gas-phase CO2 conversion has been extensively explored in literature to mitigate the CO2 diffusion limitation. At the same time, electrochemical reduction in vapour phase introduces challenges regarding water management and product cross-over. Therefore, new strategies that can boost the mass transport in water-based electrochemical systems do have potential for large scale CO2 reduction. Moreover, other electrochemical systems, such as flow batteries and membrane technologies, benefit from the same mass transfer enhancement in water-based systems. For enhancing mass transfer in aqueous electrochemical systems, gas bubbles play a central role. For many processes, gas bubbles decelerate the process via electrical resistance and shielding catalytic area. However, when controlling the gas bubble movements, we can leverage the convective properties of gas bubbles to improve the mass transfer. In this talk, I will highlight the perspectives for CO2 reduction in gas phase, but also possibilities for CO2 reduction at high current density in aqueous phase.
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 852115)
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