Hou Pengfei, Wang Xiuping, Wang Zhuo, Kang Peng
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.
University of Chinese Academy of Sciences , 19A Yuquan Road , Beijing 100049 , China.
ACS Appl Mater Interfaces. 2018 Nov 7;10(44):38024-38031. doi: 10.1021/acsami.8b11942. Epub 2018 Oct 24.
Nickel nitride was employed as the carbon enrichment electrocatalyst to reduce CO both in the aqueous phase and at the gas-solid interface. In an aqueous electrolyte, the CO Faradaic efficiency reached 85.7% at -0.90 V versus reversible hydrogen electrode with a partial current density of 6.3 mA cm. When gaseous CO was used as a reactant in a flow cell, the CO Faradaic efficiency increased to 92.5% and current density reached 23.3 mA cm. By contrast, metallic Ni and NiO generated predominantly H. The increased amount of strong base sites in the NiN catalyst could enrich CO at the catalyst surface, and the utilization of gas phase electrolysis, has cooperatively enhanced reactivity.
氮化镍被用作碳富集电催化剂，用于在水相和气固界面还原一氧化碳。在水性电解质中，相对于可逆氢电极，在-0.90 V时CO法拉第效率达到85.7%，分电流密度为6.3 mA cm。当气态CO在流动池中用作反应物时，CO法拉第效率提高到92.5%，电流密度达到23.3 mA cm。相比之下，金属Ni和NiO主要生成氢气。NiN催化剂中强碱位点数量的增加可使CO在催化剂表面富集，并且气相电解的应用协同提高了反应活性。
