Ultrahigh-Loading Zinc Single-Atom Catalyst for Highly Efficient Oxygen Reduction in Both Acidic and Alkaline Media

被引：553

作者：

Li, Jia ^{[1
]}

Chen, Siguo ^{[1
]}

Yang, Na ^{[1
]}

Deng, Mingming ^{[1
]}

Ibraheem, Shumaila ^{[1
]}

Deng, Jianghai ^{[1
]}

Li, Jing ^{[1
]}

Li, Li ^{[1
]}

Wei, Zidong ^{[1
]}

机构：

[1] Chongqing Univ, Chongqing Key Lab Chem Proc Clean Energy & Resour, Sch Chem & Engn, Chongqing 400044, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2019年 / 58卷 / 21期

基金：

中国国家自然科学基金;

关键词：

electrocatalysis; fuel cells; metal-air batteries; oxygen reduction reaction; zinc; CARBON;

D O I：

10.1002/anie.201902109

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Atomically dispersed Zn-N-C nanomaterials are promising platinum-free catalysts for the oxygen reduction reaction (ORR). However, the fabrication of Zn-N-C catalysts with a high Zn loading remains a formidable challenge owing to the high volatility of the Zn precursor during high-temperature annealing. Herein, we report that an atomically dispersed Zn-N-C catalyst with an ultrahigh Zn loading of 9.33wt% could be successfully prepared by simply adopting a very low annealing rate of 1 degrees min(-1). The Zn-N-C catalyst exhibited comparable ORR activity to that of Fe-N-C catalysts, and significantly better ORR stability than Fe-N-C catalysts in both acidic and alkaline media. Further experiments and DFT calculations demonstrated that the Zn-N-C catalyst was less susceptible to protonation than the corresponding Fe-N-C catalyst in an acidic medium. DFT calculations revealed that the Zn-N-4 structure is more electrochemically stable than the Fe-N-4 structure during the ORR process.

引用

页码：7035 / 7039

页数：5