Effect of nanoparticle composition on oxygen reduction reaction activity of Fe/N-C catalysts: a comparative study

被引：22

作者：

Huang, Xiaoqin ^{[1
]}

Wu, Xiuju ^{[1
]}

Niu, Yanli ^{[1
]}

Dai, Chunlong ^{[1
]}

Xu, Maowen ^{[1
]}

Hu, Weihua ^{[1
]}

机构：

[1] Southwest Univ, Inst Clean Energy & Adv Mat, Fac Mat & Energy, Chongqing Key Lab Adv Mat & Technol Clean Energie, 2 Tiansheng, Chongqing 400715, Peoples R China

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2019年 / 9卷 / 03期

关键词：

NITROGEN-DOPED CARBON; HIGH ELECTROCATALYTIC ACTIVITY; GRAPHENE-LIKE CARBON; ONE-POT SYNTHESIS; GRAPHITIC CARBON; IRON; SITES; NANOTUBES; SPHERES; ARRAYS;

D O I：

10.1039/c8cy02385a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The Fe/N-C catalyst is a type of promising catalyst to replace costly Pt/C for oxygen reduction reaction (ORR). The Fe agglomerates in the Fe/N-C catalyst are capable of enhancing the ORR activity, but the effect of the agglomerate composition has not received prior investigation. In this paper, three Fe/N-C catalysts composed of different Fe-based nanoparticles including metal/oxide, carbide, and nitride on nitrogen-doped graphene sheets (denoted as Fe/Fe3O4@N-G, Fe3C@N-G and FexN@N-G, respectively) are synthesized and their oxygen reduction reaction activities are compared. Electrochemical evaluation reveals an order of Fe/Fe3O4@N-G > FexN@N-G > Fe3C@N-G in ORR activity, and the best Fe/Fe3O4@N-G catalyst is even superior to the commercial Pt/C catalyst. Detailed structure and composition analyses suggest that the excellent catalytic performance is tightly associated with the high N (particularly pyridinic-N) dopants and the chemical composition of metal agglomerates in the catalyst. Our work explores a highly active ORR electrocatalyst and also reveals the effect of agglomerate composition on the activity, which may provide valuable insights into the rational design and controllable synthesis of sustainable high-performance ORR electrocatalysts.

引用

页码：711 / 717

页数：7

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