Li Huaxin, Yue Xian, Che Jing, Xiao Zhou, Yu Xianbo, Sun Fenglei, Xue Chao, Xiang Junhui
Center of Materials Science and Optoelectronics Engineering, College of Materials Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China.
ChemSusChem. 2022 Apr 7;15(7):e202200226. doi: 10.1002/cssc.202200226. Epub 2022 Feb 24.
The electrocatalytic reduction of CO (CO RR) to CO, formate, methane, and other high-value compounds is a promising technique. However, current electrocatalysts suffer from drawbacks such as few active catalytic sites, poor selectivity and low stability, etc, which restrict the practical application. Although monatomic metal catalysts have been widely reported in recent years, high performance non-noble metal aerogels were rarely investigated for electrocatalytic CO RR. Herein, Cu-Bi aerogels with boosted CO RR activity were well constructed by a simple one-step self-assembly method. The resultant Cu Bi exhibits excellent CO RR activity with high faradaic efficiency (FE) of 96.57 % towards HCOOH at a potential of -0.9 V vs. RHE, and the FE remains over 80.18 % in a wide potential window (-0.8 V to -1.2 V vs. RHE). It demonstrated that the enhanced CO RR activity of Cu-Bi aerogels could be attributed to the 3D self-supporting structure of the catalysis, synergistic effect, and low interfacial charge transfer resistance.
将一氧化碳电催化还原（CO RR）为一氧化碳、甲酸盐、甲烷及其他高价值化合物是一项很有前景的技术。然而，目前的电催化剂存在活性催化位点少、选择性差和稳定性低等缺点，这限制了其实际应用。尽管近年来单原子金属催化剂已被广泛报道，但用于电催化CO RR的高性能非贵金属气凝胶却很少被研究。在此，通过一种简单的一步自组装方法成功构建了具有增强CO RR活性的Cu-Bi气凝胶。所得的Cu Bi在相对于可逆氢电极（RHE）为-0.9 V的电位下对HCOOH表现出优异的CO RR活性，法拉第效率（FE）高达96.57%，并且在较宽的电位窗口（相对于RHE为-0.8 V至-1.2 V）内FE保持在80.18%以上。结果表明，Cu-Bi气凝胶增强的CO RR活性可归因于催化的三维自支撑结构、协同效应以及低界面电荷转移电阻。
