Journal
JOURNAL OF POWER SOURCES
Volume 272, Issue -, Pages 696-702Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.09.017
Keywords
Mesoporous carbon nitride; Three-dimensional graphene; Hollow nanosphere; Oxygen reduction reaction; Electrocatalyst
Funding
- National Natural Science Foundation of China [21275023]
- Natural Science Foundation of Jiangsu Province [BK2012593]
- Project of Young Teacher Overseas Training of Jiangsu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [BM2012110]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Hollow mesoporous carbon nitride nanosphere (HMCN) is firstly prepared via an etching route using hollow mesoporous silica as a sacrificial template. The as-obtained HMCN is a uniform spherical particle with a diameter of similar to 300 nm, and possesses a high specific surface area up to 439 m(2) g(-1). Hollow mesoporous carbon nitride nanosphere/three-dimensional (3D) graphene composite (HMCN-G) is subsequently fabricated via a hydrothermal treatment of HMCN with graphene oxide. As an electrocatalyst for oxygen reduction reaction (ORR), the HMCN-G shows significantly enhanced electrocatalytic activity compared to bulk graphitic carbon nitride (g-C3N4) and HMCN in terms of the electron-transfer number, current density and onset potential. Increased density of catalytically active sites and improved accessibility to electrolyte enabled by the hollow and mesoporous architecture of HMCN, and high conductivity induced from graphene are considered to contribute to the remarkable electrocatalytic performance of the HMCN-G. Furthermore, HMCN-G exhibits superior methanol tolerance to Pt/C catalyst, suggesting that it is a promising metal-free electrocatalyst for polymer electrolyte membrane fuel cell (PEMFC). (C) 2014 Elsevier B.V. All rights reserved.
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