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Synergistically Coupled CoMoP/Cr(OH)3 for Electrocatalytic Water Splitting.

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Summary

This study introduces a novel bifunctional electrocatalyst made of CoMoP and Cr(OH)3 for efficient water splitting. The new material significantly enhances hydrogen and oxygen evolution reactions for renewable energy production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Developing cost-effective bifunctional electrocatalysts for overall water splitting is essential for renewable energy production.
  • Existing catalysts often face challenges in efficiency and stability.

Purpose of the Study:

  • To design and synthesize a novel bifunctional electrocatalyst with enhanced activity and stability for overall water splitting.
  • To investigate the synergistic effects between CoMoP nanosheets and Cr(OH)3 nanoblocks in a heterostructure.

Main Methods:

  • Hydrothermal synthesis and electrodeposition were employed to assemble the CoMoP/Cr(OH)3 heterostructure on Nickel Foam (NF).
  • Electrochemical techniques were used to evaluate the electrocatalytic performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).

Main Results:

  • The CoMoP/Cr(OH)3/NF electrode exhibited low overpotentials of 88 mV for HER and 207 mV for OER at 10 mA cm-2.
  • The assembled CoMoP/Cr(OH)3||CoMoP/Cr(OH)3//NF system achieved an overall water splitting voltage of 1.52 V at 10 mA cm-2, surpassing many existing catalysts.
  • The strong coupling interface facilitated d-d orbital hybridization, increasing active sites and charge transfer efficiency.

Conclusions:

  • The CoMoP/Cr(OH)3 heterostructure demonstrates superior bifunctional electrocatalytic activity and stability for overall water splitting.
  • This work presents a rapid and rational strategy for developing advanced bimetallic phosphide/hydroxide heterostructured electrocatalysts.