电催化剂
选择性
法拉第效率
纳米颗粒
材料科学
乙醇
化学工程
合金
催化作用
纳米技术
化学
电化学
物理化学
冶金
有机化学
电极
工程类
作者
Sibo Shen,Xianyun Peng,Lida Song,Yuan Qiu,Chao Li,Longchao Zhuo,Jia He,Junqiang Ren,Xijun Liu,Jun Luo
出处
期刊:Small
[Wiley]
日期:2019-07-24
卷期号:15 (37)
被引量:72
标识
DOI:10.1002/smll.201902229
摘要
Abstract The CO 2 reduction reaction (CO 2 RR) driven by renewable electricity represents a promising strategy toward alleviating the energy shortage and environmental crisis facing humankind. Cu species, as one type of versatile electrocatalyst for the CO 2 RR, attract tremendous research interest. However, for C 2 products, ethanol formation is commonly less favored over Cu electrocatalysts. Herein, AuCu alloy nanoparticle embedded Cu submicrocone arrays (AuCu/Cu‐SCA) are constructed as an active, selective, and robust electrocatalyst for the CO 2 RR. Enhanced selectivity for EtOH is gained, whose Faradaic efficiency (FE) reaches 29 ± 4%, while ethylene formation is relatively inhibited (16 ± 4%) in KHCO 3 aqueous solution. The ratio between partial current densities of EtOH and C 2 H 4 ( j EtOH / j C2H4 ) can be tuned in the range from 0.15 ± 0.27 to 1.81 ± 0.55 by varying the Au content of the electrocatalysts. The combined experimental and theoretical calculation results identify the importance of Au in modifying binding energies of key intermediates, such as CH 2 CHO*, CH 3 CHO*, and CH 3 CH 2 O*, which consequently modify the activity and selectivity ( j EtOH / j C2H4 ) for the CO 2 RR. Moreover, AuCu/Cu‐SCA also shows high durability with both the current density and FE EtOH being largely maintained for 24 h electrocatalysis.
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