A highly active and stable electrocatalyst for the oxygen reduction reaction based on a graphene-supported g-C3N4@cobalt oxide core-shell hybrid in alkaline solution

被引：109

作者：

Jin, Jutao ^{[1
,2
]}

Fu, Xiaogang ^{[1
,3
]}

Liu, Qiao ^{[1
,2
]}

Zhang, Junyan ^{[1
]}

机构：

[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2013年 / 1卷 / 35期

关键词：

METAL-FREE ELECTROCATALYSTS; FREE ACTIVATION; AIR BATTERIES; FUEL-CELL; LI-AIR; CATALYSTS; EVOLUTION; NANOCRYSTALS; PERFORMANCE; OXIDATION;

D O I：

10.1039/c3ta11144j

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：

A novel hybrid, with g-C3N4 embedded CoO particles covalently supported on a two-dimensional graphene sheet, is synthesized by a facile and scalable method towards the oxygen reduction reaction (ORR) for fuel cells. The composite hybrid with a suitable loading of g-C3N4@cobalt oxide on graphene exhibits excellent electrocatalytic activity and a dominant four-electron oxygen reduction pathway in basic solution. The kinetic-limiting current density (J(k)) is 16.78 mA cm(-2) at -0.25 V, approaching that of 20% Pt-C (17.22 mA cm(-2)) at the same potential. The performance gap between the hybrid and 20% Pt-C in terms of the half-wave potential difference (Delta E-1/2) is 25 mV in alkaline solution. Furthermore, the hybrid is robust and methanol tolerant, making it a good candidate as a cathodic electrocatalyst in fuel cells.

引用

页码：10538 / 10545

页数：8

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