Oxygen Doping Induced by Nitrogen Vacancies in Nb4N5 Enables Highly Selective CO2 Reduction

被引：53

作者：

Fu, Jiantao ^{[1
]}

Bao, Haihong ^{[1
]}

Liu, Yifan ^{[2
]}

Mi, Yuying ^{[1
]}

Qiu, Yuan ^{[1
]}

Zhuo, Longchao ^{[3
]}

Liu, Xijun ^{[1
]}

Luo, Jun ^{[1
]}

机构：

[1] Tianjin Univ Technol, Sch Mat Sci & Engn, Inst New Energy Mat & Low Carbon Technol, Ctr Electron Microscopy, Tianjin 300384, Peoples R China

[2] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Guangdong, Peoples R China

[3] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Shaanxi, Peoples R China

来源：

SMALL | 2020年 / 16卷 / 02期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

CO2; electroreduction; electrocatalysis; Nb4N5; nitrogen vacancies; surface engineering; EFFICIENT ELECTROCATALYST; ELECTROREDUCTION; CATALYSTS; AMMONIA;

D O I：

10.1002/smll.201905825

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Surface vacancy engineering holds great promise for boosting the electrocatalytic activity for CO2 reduction reaction; however, the vacancies are generally unstable and may degrade into the inactive phase during electrolysis. Stabilizing the vacancy-enriched structure by heteroatoms can be an effective strategy to get a robust and active catalyst. Herein, a nitrogen-vacancy enriched Nb4N5 on N-doped carbons is constructed, which is thereafter stabilized by a self-enhanced oxygen doping process. This oxygen-doped complex is used as an effective CO2 catalyst, which exhibits a maximum CO Faradaic efficiency of 91% at -0.8 V (vs reversible hydrogen electrode, RHE) and long-term stability throughout 30 h of electrocatalysis. Density function theory calculations suggest that the incorporation of oxygen in Nb4N5 facilitates the formation of *COOH and thus promotes the CO2 reduction.

引用

页数：7

共 40 条

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