锌
电解质
电催化剂
电化学
法拉第效率
氧化还原
催化作用
无机化学
氧化态
X射线光电子能谱
化学
材料科学
电极
化学工程
冶金
物理化学
工程类
生物化学
作者
Van‐Huy Nguyen,Michael Shincheon Jee,Da Hye Won,Hee-Suk Jung,Hyung Suk Oh,Byoung Koun Min,Yun Jeong Hwang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2017-11-02
卷期号:5 (12): 11377-11386
被引量:124
标识
DOI:10.1021/acssuschemeng.7b02460
摘要
Here, we have developed porous nanostructured Zn electrocatalysts for CO2 reduction reaction (CO2RR), fabricated by reducing electrodeposited ZnO (RE-Zn) to activate the CO2RR electrocatalytic performance. We discovered that the electrochemical activation environment using CO2-bubbled electrolyte during reducing ZnO in a pretreatment step is important for highly selective CO production over H2 production, while using Ar gas bubbling instead can lead to less CO product of the Zn-based catalyst in CO2RR later. The RE-Zn activated in CO2-bubbled electrolyte condition achieves a Faradaic efficiency of CO production (FECO) of 78.5%, which is about 10% higher than that of RE-Zn activated in Ar-bubbled electrolyte. The partial current density of CO product had more 10-fold increase with RE-Zn electrodes than that of bulk Zn foil at −0.95 V vs RHE in KHCO3. In addition, a very high FECO of 95.3% can be reached using the CO2-pretreated catalyst in KCl electrolyte. The higher amount of oxidized zinc states has been found in the high performing Zn electrode surface by high-resolution X-ray photoelectron spectroscopy studies, which suggest that oxidized zinc states induce the active sites for electrochemical CO2RR. Additionally, in pre- and post-CO2RR performance tests, the carbon deposition is also significantly suppressed on RE-Zn surfaces having a higher ratio of oxidized Zn state.
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