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Zero-Gap Electrolyzers Accelerate Reconstruction of Cu2O-Derived Catalysts under CO2 Reduction
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-12-04 , DOI: 10.1021/acsenergylett.4c02634
Jehad Abed, Ivan Grigioni, Talha Kose, Wajdi Alnoush, Sungjin Park, Annalisa Polo, Byoung-Hoon Lee, David Sinton, Drew Higgins, Edward H. Sargent

To scale carbon dioxide reduction (CO2R), establishing a structure–property–performance relationship of the catalyst under the reaction conditions is a priority. Particularly in membrane electrode assembly (MEA) electrolyzers, knowledge about the valence state and coordination environment of the catalyst is of value yet limited. We developed an MEA electrolyzer that utilizes X-ray absorption spectroscopy to investigate the structural evolution of Cu2O-derived catalysts under CO2R and compare the same catalysts in a flow cell. Additionally, we study the influence of CO reduction and incorporating Ag on the reconstruction of the catalyst. We find that the strong reduction environment in the MEA and feeding CO leads to reconstruction of Cu2O particles, favoring higher coordination and lower oxidation states, which coincides with a shift in the reaction selectivity from C2+ to hydrogen. Conversely, incorporating small amounts of Ag in the catalyst restricts the reconstruction. These findings advocate for in situ studies in zero-gap electrolyzers.

中文翻译:


零间隙电解槽在 CO2 还原下加速 Cu2O 衍生催化剂的重构



为了扩大二氧化碳还原 (CO2R) 的规模,在反应条件下建立催化剂的结构-性能-性能关系是当务之急。特别是在膜电极组件 (MEA) 电解槽中,关于催化剂的价态和配位环境的知识很有价值,但有限。我们开发了一种 MEA 电解槽,它利用 X 射线吸收光谱来研究 Cu2O 衍生催化剂在 CO2R 下的结构演变,并比较流通池中的相同催化剂。此外,我们还研究了 CO 还原和掺入 Ag 对催化剂重构的影响。我们发现,MEA 和进料 CO 中的强还原环境导致 Cu2O 颗粒的重建,有利于更高的配位和更低的氧化态,这与反应选择性从 C2+ 转变为氢相吻合。相反,在催化剂中掺入少量 Ag 会限制重建。这些发现主张在零间隙电解槽中进行原位研究。
更新日期:2024-12-04
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