Effect of Small Nb-doping Amount on the Performance of BaCoO3-δ-based Perovskite as Bifunctional Oxygen Catalysts

被引：9

作者：

Li, Kangming ^{[1
]}

Yin, Meiyao ^{[1
]}

Wang, Zhigang ^{[2
]}

Chen, Xiaoyang ^{[1
]}

Zhu, Tenglong ^{[1
]}

Wang, Juan ^{[1
]}

Dewangan, Nikita ^{[2
]}

Yu, Yang ^{[1
,2
]}

Zhong, Qin ^{[1
]}

Kawi, Sibudjing ^{[2
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China

[2] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117582, Singapore

来源：

CHEMISTRYSELECT | 2018年 / 3卷 / 44期

基金：

中国国家自然科学基金;

关键词：

perovskite oxides; doping effect; nonprecious electrocatalyst; bifunctional oxygen electrocatalyst; fuel cell; ELECTROCATALYTIC ACTIVITY; PERMEABLE MEMBRANES; CATHODE MATERIAL; REDUCTION; OXIDE; EVOLUTION; NANOPARTICLES; ELECTRODE; OXIDATION;

D O I：

10.1002/slct.201802906

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Perovskite oxides are of great interest as cost-effective replacements for noble metals and oxides employed in bifunctional electrocatalysts including the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this work, a series of Bi/Nb co-doped BaCoO3-delta-based perovskite oxides BaBi0.05Co0.95-xNbxO3-delta (BBC0.95-xNx, x=0.1, 0.15, 0.2) were synthesized and evaluated as oxygen electrocatalysts for ORR and OER. It is interesting to note that Nb-doping amount is related to the contents of surface oxygen vacancies and oxidation states of cobalt, subsequently inducing performance differences among BBC0.95-xNx. Results show that BBC0.95-xNx have bifunctional electrocatalytic activities toward both ORR and OER in alkaline media. Compared with the BBC0.85N0.1 and BBC0.8N0.15, BBC0.75N0.2 with the highest Nb-doping rate delivered a lowest total overpotential between the ORR and the OER. Moreover, the BBC0.95-xNx catalysts deliver outstanding durability and methanol tolerance for ORR, better than Pt/C. BBC0.95-xNx holding promising application as nonprecious bifunctional catalysts.

引用

页码：12424 / 12429

页数：6