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Enhanced full-seawater splitting with a CoNiP@N,P-C core-shell electrocatalyst.

Fangyou Meng1, Qing Chen1, Kaiyi Shi1

  • 1School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun, 558000, China. andrewshikai@sgmtu.edu.cn.

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A novel core-shell electrocatalyst, CoNiP@N,P-C, shows excellent performance for seawater splitting. Its unique structure enhances catalytic activity for both hydrogen and oxygen evolution reactions, offering a promising approach for clean energy production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient electrocatalysts is crucial for sustainable energy technologies.
  • Seawater splitting presents a promising route for hydrogen production but faces challenges with catalyst stability and activity.
  • Bimetal phosphides offer potential as electrocatalysts, but their performance can be limited by structural stability.

Purpose of the Study:

  • To investigate a novel core-shell electrocatalyst, CoNiP@N,P-C, for overall seawater splitting.
  • To evaluate the electrochemical properties and catalytic performance of the CoNiP@N,P-C catalyst.
  • To understand the role of the core-shell structure in enhancing catalytic activity and stability.

Main Methods:

  • Synthesis of a core-shell electrocatalyst (CoNiP@N,P-C) with a protective carbon shell.
  • Electrochemical characterization using techniques like cyclic voltammetry and chronoamperometry in simulated and real seawater.
  • Density Functional Theory (DFT) calculations to analyze the hydrogen adsorption free energy (ΔGH*).

Main Results:

  • The CoNiP@N,P-C catalyst demonstrated low overpotentials of 234 mV (HER) and 314 mV (OER) in 1 M KOH + 0.5 M NaCl.
  • Achieved a cell voltage of 1.71 V at 10 mA cm-2 for full seawater splitting.
  • DFT calculations revealed a favorable ΔGH* of -0.19 eV for CoNiP@N,P-C, indicating enhanced hydrogen evolution kinetics.

Conclusions:

  • The core-shell structure of CoNiP@N,P-C effectively protects the active sites and enhances catalytic performance for seawater splitting.
  • The catalyst exhibits superior activity and stability, making it a promising candidate for overall water electrolysis.
  • This study introduces a viable strategy using bimetal phosphide core-shell structures for efficient and durable seawater electrolysis.