Lamaison Sarah, Wakerley David, Kracke Frauke, Moore Thomas, Zhou Lan, Lee Dong Un, Wang Lei, Hubert McKenzie A, Aviles Acosta Jaime E, Gregoire John M, Duoss Eric B, Baker Sarah, Beck Victor A, Spormann Alfred M, Fontecave Marc, Hahn Christopher, Jaramillo Thomas F
Collège de France, Sorbonne University, Laboratory of the Chemistry of Biological Processes, CNRS UMR 8229, Paris, 75231, France.
SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.
Adv Mater. 2022 Jan;34(1):e2103963. doi: 10.1002/adma.202103963. Epub 2021 Oct 21.
CO emissions can be transformed into high-added-value commodities through CO 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 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 conversion toward sought-after products.
通过CO电催化，CO排放可以转化为高附加值商品；然而，要在全球范围内扩大规模，需要高效的低成本电催化剂。受其他新兴技术启发，作者报告了一种在低成本锌基质中含有高度分散银位点的气体扩散电极的开发。这种催化剂在CO生成方面表现出前所未有的银质量活性：在0.17毫克银时为-614毫安/平方厘米。随后的电解质工程表明，卤化物阴离子可以进一步提高锌-银催化剂的稳定性和活性，优于纯银和金。构建了膜电极组件，并将其与将CO转化为乙酸盐和乙醇的微生物过程相结合。综合起来，这些概念为设计用于将CO转化为所需产品的催化剂和系统提供了途径。
