Intrator Jeremy A, Velazquez David A, Fan Sicheng, Mastrobattista Ellie, Yu Christine, Marinescu Smaranda C
Department of Chemistry, University of Southern California Los Angeles CA 900089 USA
Chem Sci. 2024 Feb 12;15(17):6385-6396. doi: 10.1039/d3sc06805f. eCollection 2024 May 1.
Electrochemical conversion of CO to value-added products serves as an attractive method to store renewable energy as energy-dense fuels. Selectivity in this type of conversion can be limited, often leading to the formation of side products such as H. The activity of a cobalt phosphino-thiolate complex ([Co(triphos)(bdt)]) towards the selective reduction of CO to formate is explored in this report. In the presence of HO, selective production of formate (as high as 94%) is observed at overpotentials of 750 mV, displaying negligible current degradation during long-term electrolysis experiments ranging as long as 24 hours. Chemical reduction studies of [Co(triphos)(bdt)] indicates deligation of the apical phosphine moiety is likely before catalysis. Computational and experimental results suggest a metal-hydride pathway, indicating an ECEC based mechanism.
将CO电化学转化为高附加值产品是一种将可再生能源存储为能量密集型燃料的有吸引力的方法。这种转化类型的选择性可能受到限制,常常导致副产物如H的形成。本报告探讨了钴膦硫醇配合物([Co(triphos)(bdt)])将CO选择性还原为甲酸盐的活性。在HO存在下,在750 mV的过电位下观察到甲酸盐的选择性生产(高达94%),在长达24小时的长期电解实验中,电流降解可忽略不计。[Co(triphos)(bdt)]的化学还原研究表明,顶端膦部分在催化之前可能发生脱配位。计算和实验结果表明存在金属氢化物途径,表明基于ECEC的机制。