Conn Center for Renewable Energy Research, University of Louisville, 216 Eastern Parkway, Louisville, KY, 40292, USA.
ChemSusChem. 2020 Jun 8;13(11):3028-3033. doi: 10.1002/cssc.202000464. Epub 2020 May 4.
Efficient electroreduction of carbon dioxide has been a widely pursued goal as a sustainable method to produce value-added chemicals while mitigating greenhouse gas emissions. Processes have been demonstrated for the electroreduction of CO to CO at nearly 100 % faradaic efficiency, and as a consequence, there has been growing interest in the further electroreduction of carbon monoxide. Oxide-derived copper catalysts have promising performance for the reduction of CO to hydrocarbons but have still been unable to achieve high selectivity to individual products. A pulsed-bias technique is one strategy for tuning electrochemical selectivity without changing the catalyst. Herein a pulsed-bias electroreduction of CO was investigated on oxide-derived copper catalyst. Increased selectivity for single-carbon products (i.e., formate and methane) was achieved for higher pulse frequencies (<1 s pulse times), as well as an increase in the fraction of charge directed to CO reduction rather than hydrogen evolution.
高效电还原二氧化碳作为一种可持续的方法，可同时生产高附加值化学品和减少温室气体排放，一直是一个广泛的研究目标。已经有研究证明了在近 100%法拉第效率下将 CO 电还原为 CO，因此，人们对进一步将一氧化碳电还原越来越感兴趣。氧化物衍生的铜催化剂在将一氧化碳还原为碳氢化合物方面具有很有前景的性能，但仍然无法实现对个别产物的高选择性。脉冲偏压技术是一种在不改变催化剂的情况下调节电化学选择性的策略。在此，在氧化物衍生的铜催化剂上研究了 CO 的脉冲偏压电还原。对于更高的脉冲频率（<1s 的脉冲时间），可以实现对单碳产物（即甲酸盐和甲烷）更高的选择性，以及更多的电荷用于 CO 还原而不是析氢。
