Multiscale porous molybdenum phosphide of honeycomb structure for highly efficient hydrogen evolution

Nanoscale
Mengjie HouZuofeng Chen

Abstract

The hydrogen evolution reaction (HER) based on electrochemical water splitting is considered a promising strategy to produce clean and sustainable hydrogen energy. Searching for non-noble metal based electrocatalysts with high efficiency and durability toward the HER is vitally necessary. In this work, we report a novel method for synthesizing molybdenum phosphide (MoP) supported on multiscale porous honeycomb carbon (MoP@HCC) and the application of this catalyst material in acidic media for water electrolysis. Due to the unique structure of the catalyst material, the as-prepared MoP@HCC shows remarkable electrocatalytic activity and stability in 0.5 M H2SO4 aqueous solution. The hybrid catalyst could deliver a current density of 10 mA cm-2 at a low overpotential of 129 mV, with an onset overpotential of 69 mV and a Tafel slope of 48 mV dec-1, outperforming most of the current noble-metal-free electrocatalysts. This study demonstrates an effective way for multiscale control of the MoP structure via overall consideration of the mass transport, and the accessibility, quantity and capability of active sites toward the HER.

References

May 11, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Qiyu YuXun Wang
Jun 15, 2013·Journal of the American Chemical Society·Eric J PopczunRaymond E Schaak
Nov 14, 2013·Journal of the American Chemical Society·Yujie SunChristopher J Chang
Aug 8, 2014·Chemical Communications : Chem Comm·Joshua M McEnaneyRaymond E Schaak
Sep 18, 2014·Chemical Communications : Chem Comm·Lin Feng PanHua Gui Yang
Feb 11, 2015·Journal of the American Chemical Society·Charles C L McCroryThomas F Jaramillo
Apr 26, 2015·Nature Communications·Qi LuJingguang G Chen
Oct 6, 2015·Angewandte Chemie·Yu-Jia TangShu-Hong Yu
Nov 9, 2017·ACS Applied Materials & Interfaces·Weiqiang TangZuofeng Chen

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Methods Mentioned

BETA
X-ray
scanning electron microscopy
transmission electron microscopy
chemical vapor deposition
electron diffraction

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