Main content area

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

Liu, Ming, Lu, Xiaoqing, Guo, Chen, Wang, Zhaojie, Li, Yanpeng, Lin, Yan, Zhou, Yan, Wang, Shutao, Zhang, Jun
ACS applied materials & interfaces 2017 v.9 no.41 pp. 36146-36153
carbon, catalysts, electrolysis, encapsulation, nanocrystals, oxygen production, porous media
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.