Hollow Spheres of Iron Carbide Nanoparticles Encased in Graphitic Layers as Oxygen Reduction Catalysts

被引:846
作者
Hu, Yang [1 ,2 ]
Jensen, Jens Oluf [1 ]
Zhang, Wei [3 ]
Cleemann, Lars N. [1 ]
Xing, Wei [2 ]
Bjerrum, Niels J. [1 ]
Li, Qingfeng [1 ]
机构
[1] Tech Univ Denmark, Dept Energy Convers & Storage, DK-2800 Lyngby, Denmark
[2] Chinese Acad Sci, Changchun Inst Appl Chem, Lab Adv Power Sources, Changchun 130022, Peoples R China
[3] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark
基金
新加坡国家研究基金会; 中国国家自然科学基金;
关键词
electrocatalysis; fuel cells; iron carbides; nonprecious metal catalysts; oxygen reduction reaction; HIGH ELECTROCATALYTIC ACTIVITY; CARBON NANOTUBES; METAL ELECTROCATALYSTS; FUEL-CELLS; POLYANILINE; GRAPHENE; ARRAYS;
D O I
10.1002/anie.201400358
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nonprecious metal catalysts for the oxygen reduction reaction are the ultimate materials and the foremost subject for low-temperature fuel cells. A novel type of catalysts prepared by high-pressure pyrolysis is reported. The catalyst is featured by hollow spherical morphologies consisting of uniform iron carbide (Fe3C) nanoparticles encased by graphitic layers, with little surface nitrogen or metallic functionalities. In acidic media the outer graphitic layers stabilize the carbide nanoparticles without depriving them of their catalytic activity towards the oxygen reduction reaction (ORR). As a result the catalyst is highly active and stable in both acid and alkaline electrolytes. The synthetic approach, the carbide-based catalyst, the structure of the catalysts, and the proposed mechanism open new avenues for the development of ORR catalysts.
引用
收藏
页码:3675 / 3679
页数:5
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