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Abstract CO 2 emissions can be transformed into high‐added‐value commodities through CO 2 electrocatalysis; however, efficient low‐cost electrocatalysts are needed for global scale‐up. Inspired by other emerging technologies, the authors report the development of a gas diffusion electrode containing highly dispersed Ag sites in a low‐cost Zn matrix. This catalyst shows unprecedented Ag mass activity for CO production: − 614 mA cm −2 at 0.17 mg of Ag. Subsequent electrolyte engineering demonstrates that halide anions can further improve stability and activity of the Zn–Ag catalyst, outperforming pure Ag and Au. Membrane electrode assemblies are constructed and coupled to a microbial process that converts the CO to acetate and ethanol. Combined, these concepts present pathways to design catalysts and systems for CO 2 conversion toward sought‐after products.
Lamaison et al. (Thu,) studied this question.