As electrochemical technologies become increasingly important in our energy paradigm, especially hydrogen and CO2 reduction, there is a need to examine them holistically. Furthermore, for such technologies to become practical, they need to operate at high current densities to minimize various cell costs. This operating space necessitates the need for efficient transport of reactants and removal of products from the reaction site. For example, one of the main challenges towards achieving high-efficiency fuel generators performing CO2 reduction are the mass-transport limitations in traditional aqueous systems due to CO2 interactions/solubility and boundary-layer thickness. To circumvent these issues, gas-diffusion electrodes (GDEs) are considered wherein the reactants and products are fed or removed in a vapor form into a porous 3-D electrode that leverage knowledge from the fuel-cell and electrolyzer fields. In this talk, we will explore the various tradeoffs endemic in GDE architectures for various electrochemical reactions including CO2 and CO reduction and O2 and H2 consumption and evolution with a focus on the interfacial phenomena at the catalyst/ionomer interface and the local reaction microenvironment.

Controlling electrochemical reactivity at the ionomer/catalyst interface

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