吸附
化学
催化作用
电化学
无机化学
电解质
氧化还原
碘
X射线光电子能谱
光谱学
衰减全反射
卤素
吸收(声学)
红外光谱学
吸收光谱法
离子
光化学
物理化学
电极
化学工程
材料科学
有机化学
复合材料
工程类
物理
量子力学
烷基
作者
Xinyue Wang,Chenyan Guo,Bowen Zhu,D.Q. Xiao,Dunfeng Gao,Zhi Liu,Fan Yang
摘要
The electrolyte effect has been key to the electrochemical CO2 reduction reaction (CO2RR) and has received extensive attention in recent years. Here we combined atomic force microscopy, quasi-in situ X-ray photoelectron spectroscopy, and in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) to study the effect of iodine anions on Cu-catalyzed CO2RR in the absence or presence of KI in the KHCO3 solution. Our results suggested that iodine adsorption caused coarsening of the Cu surface and altered its intrinsic activity for CO2RR. As the potential of the Cu catalyst became more negative, there was an increase in surface iodine anion concentration ([I-]), which could be connected to the reaction-enhanced adsorption of I- ions accompanying the increase in CO2RR activity. A linear relationship was observed between [I-] and current density. SEIRAS results further suggested that the presence of KI in the electrolyte strengthened the Cu-CO bond and facilitated the hydrogenation process, enhancing the production of CH4. Our results have thus provided insight into the role of halogen anions and aided in the design of an efficient CO2RR process.
科研通智能强力驱动
Strongly Powered by AbleSci AI