Heterogeneous atoms-doped titanium carbide as a precious metal-free electrocatalyst for oxygen reduction reaction

被引:22
作者
Cui, Xiangzhi [1 ]
Meng, Lu [2 ]
Zhang, Xiaohua [1 ,3 ]
Wang, Xingang [1 ]
Shi, Jianlin [1 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
[2] Shanghai Baosteel Ind Technol Serv CO LTD, Shanghai 201900, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
上海市自然科学基金; 中国国家自然科学基金;
关键词
Titanium carbide; ORR; Dopant; Heterogeneous atom; Cooperative effects; TRANSITION-METAL; CARBON CATALYSTS; PERFORMANCE; GRAPHENE; POLYANILINE; DURABILITY; NITRIDE; IRON;
D O I
10.1016/j.electacta.2018.10.169
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Developing precious metal-free electrocatalysts with both high and stable oxygen reduction reaction (ORR) electrochemical activity is still the key challenge in the wide application of clean energy, e.g. fuel cells or metal air batteries. Here, TiC based precious metal-free ORR catalyst has been studied by doping heterogeneous atoms. N-doping results in enhanced ORR performance of N/TiC, which was further elevated by introducing metal (e.g. Fe, Co) into TiC powders. Especially, the resultant Fe-N/TiC demonstrates the highest ORR activity among the prepared samples, which exhibits approximate 4e(-) pathway with a comparable electron-transfer number to the benchmark 20 wt%Pt/C, and much higher methanol tolerance than the latter in alkaline media. The high ORR performance of Fe-N/TiC composite could be ascribed to the cooperative effects of both N and metal doping, in which the N doping would lead to the change of electronic structure near the TiC surface and the formation of C-N active sites, and the metal species addition leads to the formation of a certain amount of Me-N-x active sites resulting in the further ORR activity enhancement. The reasonably high and stable electrochemical catalytic activity and the excellent methanol tolerance make the precious-metal free Fe-N/TiC composite a promising candidate cathode catalyst in ORR. (C) 2018 Published by Elsevier Ltd.
引用
收藏
页码:384 / 392
页数:9
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