电合成
材料科学
原位
催化作用
化学工程
纳米技术
电化学
电极
有机化学
物理化学
化学
工程类
作者
Ding Pan,Julius Kühne,Saswati Santra,Reinhard Zell,Philipp Zellner,Tim Rieth,Jian Gao,Jianian Chen,Guanda Zhou,Johannes Dittloff,Knut Müller‐Caspary,Ian D. Sharp
标识
DOI:10.1002/aenm.202303936
摘要
Abstract Electrochemical CO 2 reduction is of tremendous interest for storing chemical energy from renewable sources while reducing CO 2 emissions. While copper is one of the most effective catalysts, it suffers from low selectivity and limited long‐term durability. Here, these limitations are overcome by engineering Nafion coatings on CuO nanoparticle‐based catalysts supported on glassy carbon. By tuning the Nafion thickness and internal structure, it is shown that both the selectivity to multicarbon (C 2+ ) products and long‐term stability can be dramatically enhanced. Optimized catalyst layers reach Faradaic efficiencies for C 2+ products of 86% during long‐term testing for 200 h, with no evidence for performance degradation. Indeed, the C 2+ Faradaic efficiency increases during testing, which is attributed to favorable in situ electrochemical fragmentation of catalytic nanoparticles. Finally, the optimized Nafion/Cu catalytic coatings are utilized to create scalable membrane electrode assemblies for CO 2 electrolysis, yielding significantly enhanced C 2 H 4 selectivity (≈58%) and activity at technologically‐relevant currents of 1–2 A. These results highlight the potential for creating multi‐functional Nafion coatings on CO 2 reduction catalysts to favorably tune the reaction environment, while also promoting in situ transformations to active and selective nanoscale structures and morphologies, not just on model surfaces but also in state‐of‐the‐art gas diffusion electrodes.
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