ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
3 years ago

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

Architecting a Mesoporous N-Doped Graphitic Carbon Framework Encapsulating CoTe2 as an Efficient Oxygen Evolution Electrocatalyst
Yanpeng Li, Jun Zhang, Yan Zhou, Chen Guo, Zhaojie Wang, Yan Lin, Ming Liu, Shutao Wang, Xiaoqing Lu
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.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b09897

DOI: 10.1021/acsami.7b09897

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