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CoP-nanorod-doped Co heterostructured electrode for efficient electrocatalytic hydrogen evolution reaction.

Yuanze Wei1, Shiyu Yang1, Danyang Yu1

  • 1Department of Chemical Engineering, Liaodong University Dandong 118001 China zoubenxue@liaodongu.edu.cn.

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A novel cobalt phosphide-doped cobalt metal on nickel foam (CoP/Co/NF) electrode demonstrates superior hydrogen evolution reaction (HER) performance. This advanced electrocatalyst offers efficient, stable, and low-energy hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient electrocatalysts is crucial for hydrogen evolution reaction (HER) in sustainable energy technologies.
  • Heterogeneous structures and synergistic effects are key to enhancing electrocatalytic activity and stability.

Purpose of the Study:

  • To design and synthesize a high-performance cobalt phosphide-doped cobalt metal on nickel foam (CoP/Co/NF) electrocatalytic electrode.
  • To investigate the synergistic effects of heterogeneous Co and CoP structures for improved electrocatalysis.
  • To evaluate the catalytic activity, stability, and mechanism of the CoP/Co/NF electrode for HER.

Main Methods:

  • A two-step synthesis strategy involving electrodeposition and low-temperature phosphorization.
  • Characterization of the electrode's hierarchical architecture and electrochemical active surface area (ECSA).
  • Electrochemical testing in 1 M KOH electrolyte to assess HER performance, including overpotential and Tafel slope.
  • Long-term stability testing and theoretical DFT calculations.

Main Results:

  • The CoP/Co/NF electrode exhibited a hierarchical sea-urchin-like architecture with a large ECSA (537.5 cm²).
  • Excellent catalytic activity for HER was observed, with optimized overpotentials of 23 mV at 10 mA cm⁻² and 56 mV at 100 mA cm⁻².
  • The catalyst demonstrated a low Tafel slope (27.1 mV dec⁻¹) and remarkable stability over 100 hours at 100 mA cm⁻².
  • DFT calculations indicated that the CoP/Co interface is electron-rich, facilitating water dissociation and optimizing hydrogen adsorption.

Conclusions:

  • The designed CoP/Co/NF electrode shows exceptional performance for the hydrogen evolution reaction.
  • The hierarchical heterogeneous structure and synergistic effects between CoP and Co are responsible for the enhanced electrocatalytic activity and stability.
  • This material holds significant promise for efficient and durable hydrogen production.