Template-free synthesis of hierarchical yolk-shell Co and N codoped porous carbon microspheres with enhanced performance for oxygen reduction reaction

被引:46
作者
Chao, Shujun [1 ,2 ]
Cui, Qian [1 ]
Wang, Kui [1 ]
Bai, Zhengyu [1 ]
Yang, Lin [1 ]
Qiao, Jinli [1 ,3 ]
机构
[1] Henan Normal Univ, Key Lab Green Chem Media & React, Collaborat Innovat Ctr Henan Prov Fine Chem Green, Sch Chem & Chem Engn,Minist Educ, Xinxiang 453007, Peoples R China
[2] Xinxiang Med Univ, Dept Chem, Xinxiang 453007, Peoples R China
[3] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
基金
中国国家自然科学基金;
关键词
Template-free synthesis; Yolk-shell; Porous structure; Transition metal and N codoped carbon materials; Oxygen reduction reaction; Oxygen evolution reaction; NONPRECIOUS METAL CATALYST; PEM FUEL-CELLS; HIGHLY EFFICIENT; MESOPOROUS CARBONS; ALKALINE MEDIA; DOPED CARBON; NITROGEN; ELECTROCATALYSTS; GRAPHENE; SUPERCAPACITORS;
D O I
10.1016/j.jpowsour.2015.04.049
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 structures and compositions of materials have important influences on their performance. Herein, hierarchically structured yolk-shell Co and N codoped porous carbon microspheres (YS-Co/N-PCMs) have been successfully synthesized by using low-cost melamine, formaldehyde and cobalt acetate as raw materials via a facile template-free hydrothermal method and a subsequent pyrolysis. The formation process of the yolk-shell precursor is systematically investigated, involving a morphological evolution process from solid microspheres, ultrathin and wrinkled shells wrap, to yolk-shell structure formation. More importantly, the unique structure combines the favorable features towards oxygen reduction reaction (ORR), such as high surface area, sufficient Co-Nx and graphitic N active sites and suitable pore structures. As a result, the YS-Co/N-PCMs catalyst shows high catalytic activity for ORR in alkaline media for fuel cells, which not only outperforms commercial Pt-based catalysts in terms of resistance to methanol crossover and long-time stability, but is also better than many non-precious metal doped carbon-based catalysts reported previously. In addition, the YS-Co/N-PCMs catalyst also has high catalytic activity toward oxygen evolution reaction (OER). Therefore, the YS-Co/N-PCMs catalyst may serve as a promising alternative to Pt/C catalyst for ORR and OER in alkaline media. (c) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:128 / 135
页数:8
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