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This study engineered a novel CoP/CoNi2S4 composite catalyst for efficient water splitting and energy storage. The integrated catalyst shows superior performance in hydrogen evolution, oxygen evolution, and as a hybrid supercapacitor.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Integrated catalysts for water splitting, urea electrolysis, and energy storage are challenging to engineer.
  • Theoretical predictions suggested CoP/CoNi2S4 composites enhance hydrogen evolution reaction (HER) activity.

Purpose of the Study:

  • To fabricate and evaluate a CoP/CoNi2S4 nanorod structure for integrated electrocatalytic and energy storage applications.
  • To assess the catalyst's performance in overall water splitting, urea electrolysis, and as a hybrid supercapacitor.

Main Methods:

  • Fabrication of CoP/CoNi2S4 nanorod composite structure.
  • Electrochemical characterization of HER and oxygen evolution reaction (OER) performance in acidic, alkaline, and seawater electrolytes.
  • Testing of a symmetric electrolyzer with urea-added electrolytes.
  • Assembly and evaluation of a CoP/CoNi2S4//AC hybrid supercapacitor device.

Main Results:

  • The CoP/CoNi2S4 nanorod structure demonstrated exceptional HER activity across various conditions, surpassing commercial Pt/C at high current densities.
  • The catalyst exhibited superior OER activity in alkaline media and simulated seawater, outperforming commercial RuO2.
  • A symmetric electrolyzer using the composite achieved 10 mA cm-2 at 1.53 V in urea-added electrolytes.
  • The hybrid supercapacitor delivered an energy density of 50.9 Wh kg-1 with excellent cycling stability.

Conclusions:

  • The CoP/CoNi2S4 composite effectively integrates electrocatalytic and energy storage functionalities.
  • This multifunctional material shows significant promise for advanced energy conversion technologies.