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Template-Directed Bifunctional Dodecahedral CoP/CN@MoS₂ Electrocatalyst for High Efficient Water Splitting.

Jian-Gang Li¹, Kefeng Xie², Huachuan Sun¹

¹School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan 430074 , P.R. China.

ACS Applied Materials & Interfaces

|September 20, 2019

Summary

Noble metal-free electrocatalysts were developed for efficient hydrogen and oxygen generation. The novel CoP/CN@MoS2 material shows promising bifunctional catalytic activity in both acidic and alkaline conditions.

Keywords:

CoP/CN@MoS2 bifunctional herterostructures synergisitic effect water splitting

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Published on: August 7, 2018

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Developing efficient, earth-abundant bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains a significant challenge.
Noble metal-based catalysts are effective but costly, driving research into alternative materials.

Purpose of the Study:

To synthesize and characterize a novel, hierarchical dodecahedral-structured cobalt phosphide/nitrogen-doped carbon/molybdenum disulfide (CoP/CN@MoS2) electrocatalyst.
To evaluate the bifunctional electrocatalytic performance of the synthesized material for both HER and OER.
To elucidate the synergistic effects contributing to the enhanced catalytic activity through theoretical calculations.

Main Methods:

Hierarchical dodecahedral CoP/CN@MoS2 synthesized using ZIF-67 as a template, followed by calcination and solvothermal methods.
Electrocatalytic performance for HER and OER evaluated in acidic and alkaline aqueous solutions.
Density functional theory (DFT) calculations employed to investigate the electronic structure and catalytic mechanisms.

Main Results:

The CoP/CN@MoS2 hybrid catalyst demonstrated excellent HER activity in acidic (overpotential of 144 mV at 10 mA/cm²) and alkaline (149 mV) media.
The catalyst also exhibited superior OER performance in 1.0 M KOH, with an overpotential of 289 mV at 10 mA/cm².
Synergistic effects between CoP, nitrogen-doped carbon, and MoS2 significantly enhanced electrocatalytic kinetics.

Conclusions:

The developed CoP/CN@MoS2 material represents a highly efficient, noble metal-free bifunctional electrocatalyst.
The hierarchical structure and synergistic coupling of components are key to achieving enhanced HER and OER performance.
This study offers a promising pathway for designing advanced non-precious metal catalysts for clean energy applications.