JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Three-dimensional ordered mesoporous Co 3 O 4 enhanced by Pd for oxygen evolution reaction.

Scientific Reports 2017 January 31
Considerable efforts have been devoted recently to design and fabrication of high performance and low cost electrocatalysts for oxygen evolution reaction (OER). However, catalytic activity of current electrocatalysts is usually restricted by high onset potential and limited active sites. Herein, we fabricated three-dimensional (3D) highly ordered mesoporous Pd-Co3 O4 composite materials as excellent electrocatalysts for OER in alkaline solution with high activity and stability. Three-dimensional highly ordered mesoporous Co3 O4 material was firstly synthesized using mesoporous silica KIT-6 as hard template. Then, Pd-Co3 O4 nanomaterials were prepared by a simple reduction method. The as-prepared 3D mesoporous Pd-Co3 O4 catalysts have ordered mesoporous structure with a high surface area of 81.0 m2  g-1 . Three-dimensional highly ordered mesoporous structure can facilitate diffusion and penetration of electrolyte and oxygen. Moreover, the catalysts can also keep catalyst particles in a well dispersed condition with more catalytic active sites. Electrochemical measurements reveal that the 3D mesoporous Pd-Co3 O4 catalysts exhibit superior performance in alkaline solution with low onset potential (0.415 V vs. SCE) and excellent long-duration cycling stability.

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