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Architecting a Mesoporous N-Doped Graphitic Carbon Framework Encapsulating CoTe2 as an Efficient Oxygen Evolution Electrocatalyst

Author:
Liu, Ming, Lu, Xiaoqing, Guo, Chen, Wang, Zhaojie, Li, Yanpeng, Lin, Yan, Zhou, Yan, Wang, Shutao, Zhang, Jun
Source:
ACS applied materials & interfaces 2017 v.9 no.41 pp. 36146-36153
ISSN:
1944-8252
Subject:
carbon, catalysts, electrolysis, encapsulation, nanocrystals, oxygen production, porous media
Abstract:
To improve the efficiency of cobalt-based catalysts for water electrolysis, tremendous efforts have been dedicated to tuning the composition, morphology, size, and structure of the materials. We report here a facile preparation of orthorhombic CoTe₂ nanocrystals embedded in an N-doped graphitic carbon matrix to form a 3D architecture with a size of ∼500 nm and abundant mesopores of ∼4 nm for the oxygen evolution reaction (OER). The hybrid electrocatalyst delivers a small overpotential of 300 mV at 10 mA cm–², which is much lower than that for pristine CoTe₂ powder. After cycling for 2000 cycles or driving continual OER for 20 h, only a slight loss is observed. The mesoporous 3D architecture and the strong interaction between N-doped graphitic carbon and CoTe₂ are responsible for the enhancement of the electrocatalytic performance.
Agid:
5835356