Li Hefei, Liu Tianfu, Wei Pengfei, Lin Long, Gao Dunfeng, Wang Guoxiong, Bao Xinhe
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2021 Jun 21;60(26):14329-14333. doi: 10.1002/anie.202102657. Epub 2021 May 17.
Electrochemical CO reduction reaction (CO RR) to multicarbon hydrocarbon and oxygenate (C ) products with high energy density and wide availability is of great importance, as it provides a promising way to achieve the renewable energy storage and close the carbon cycle. Herein we design a Cu-CuI composite catalyst with abundant Cu /Cu interfaces by physically mixing Cu nanoparticles and CuI powders. The composite catalyst achieves a remarkable C partial current density of 591 mA cm at -1.0 V vs. reversible hydrogen electrode in a flow cell, substantially higher than Cu (329 mA cm ) and CuI (96 mA cm ) counterparts. Induced by alkaline electrolyte and applied potential, the Cu-CuI composite catalyst undergoes significant reconstruction under CO RR conditions. The high-rate C production over Cu-CuI is ascribed to the presence of residual Cu and adsorbed iodine species which improve CO adsorption and facilitate C-C coupling.
通过电化学将一氧化碳还原反应（CO RR）转化为具有高能量密度和广泛可用性的多碳烃和含氧化合物（C）产物具有重要意义，因为它为实现可再生能源存储和闭合碳循环提供了一条有前景的途径。在此，我们通过物理混合铜纳米颗粒和碘化亚铜粉末设计了一种具有丰富Cu⁺/Cu界面的Cu-CuI复合催化剂。在流动池中，相对于可逆氢电极，该复合催化剂在-1.0 V时实现了显著的591 mA cm⁻²的C分电流密度，大大高于Cu（329 mA cm⁻²）和CuI（96 mA cm⁻²）对应物。在碱性电解质和外加电势的诱导下，Cu-CuI复合催化剂在CO RR条件下发生显著重构。Cu-CuI上的高速率C生成归因于残余Cu和吸附碘物种的存在，它们改善了CO吸附并促进了C-C偶联。
