Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 43, Pages 21471-21477Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05018a
Keywords
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Funding
- National Natural Science Foundation of China [21375123]
- 973 Project [2011CB911002]
- Ministry of Science and Technology of China [2013YQ170585]
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Developing highly efficient and low-cost noble metal-free catalysts toward hydrogen evolution from water splitting is an attractive alternative strategy to solve the ever-increasing environmental contamination and energy demand. Herein, a porous CoP electrocatalyst with a concave polyhedron (CPH) structure was facilely prepared by a topological conversion strategy using Co-MOF (ZIF-67) polyhedrons as the precursor. The morphology of Co-MOFs is well inherited by the as-prepared CoP sample due to the multi-step calcination process at low temperature, which results in the formation of a porous structure. Compared with the contrastive CoP nanoparticles (NPs), the obtained porous CoP CPH electrocatalyst exhibits a remarkably enhanced electrocatalytic performance with a current density of 10 mA cm(-2) at an overpotential of 133 mV and a superior durability for the hydrogen evolution reaction (HER) in acid media. A small Tafel slope of ca. 51 mV dec(-1) reveals a Volmer-Heyrovsky mechanism during the HER. This work provided a new insight to fabricate morphology-controlled transition metal phosphides with a porous structure via topological conversion, which have importantly potential applications, such as electrocatalysis, photocatalysis and sensors, thanks to their porosity and controllability.
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