选择性
电化学
法拉第效率
解吸
密度泛函理论
碳纤维
材料科学
电极
电解质
化学
化学工程
无机化学
催化作用
吸附
复合数
物理化学
有机化学
计算化学
复合材料
工程类
作者
Yugang Gao,Shiyang Yu,Peng Zhou,Xixi Ren,Zeyan Wang,Zhaoke Zheng,Peng Wang,Hefeng Cheng,Yuanyuan Liu,Wei Wei,Ying Dai,Baibiao Huang
出处
期刊:Small
[Wiley]
日期:2021-12-16
卷期号:18 (9)
被引量:16
标识
DOI:10.1002/smll.202105212
摘要
The electrochemical CO2 reduction reaction (CO2 RR) has great potential in realizing carbon recycling while storing sustainable electricity as hydrocarbon fuels. However, it is still a challenge to enhance the selectivity of the CO2 RR to single multi-carbon (C2+ ) product, such as C2 H4 . Here, an effective method is proposed to improve C2 H4 selectivity by inhibiting the production of the other competitive C2 products, namely C2 H5 OH, from Cu2 O/C composite. Density functional theory indicates that the heterogeneous structure between Cu2 O and carbon is expected to inhibit C2 H5 OH production and promote CC coupling, which facilitates C2 H4 production. To prove this, a composite electrode containing octahedral Cu2 O nanoparticles (NPs) (o-Cu2 O) with {111} facets and carbon NPs is constructed, which experimentally inhibits C2 H5 OH production while strongly enhancing C2 H4 selectivity compared with o-Cu2 O electrode. Furthermore, the surface hydroxylation of carbon can further improve the C2 H4 production of o-Cu2 O/C electrode, exhibiting a high C2 H4 Faradaic efficiency of 67% and a high C2 H4 current density of 45 mA cm-2 at -1.1 V in a near-neutral electrolyte. This work provides a new idea to improve C2+ selectivity by controlling products desorption.
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