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Plasma enabled non-thermal phosphorization for nickel phosphide hydrogen evolution catalysts.

Xiuqi Wu1, Yanru Guo, Teng Wang

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|March 22, 2019
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This study presents a new, safer method for creating nickel phosphide (Ni2P) catalysts using H2 plasma and red phosphorus at low temperatures. The resulting Ni2P nanosheet arrays on nickel foam show excellent performance for hydrogen evolution reactions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Nickel phosphide (Ni2P) is a promising catalyst for the hydrogen evolution reaction (HER).
  • Traditional Ni2P synthesis methods involve high temperatures or toxic phosphorus sources like PH3.
  • Developing safer and more efficient synthesis routes for Ni2P is crucial for advancing HER technologies.

Purpose of the Study:

  • To develop a low-temperature, safe synthesis method for Ni2P nanosheet arrays on nickel foam (Ni2P/NF).
  • To investigate the catalytic activity and stability of the synthesized Ni2P/NF for the hydrogen evolution reaction.

Main Methods:

  • Synthesis of Ni2P/NF using H2 plasma-activated red phosphorus and a NiO/NF precursor at 250 °C.
  • Characterization of the Ni2P/NF material structure and composition.
  • Electrochemical testing of the Ni2P/NF electrode for hydrogen evolution reaction (HER) in acidic media.

Main Results:

  • Successfully synthesized self-supported Ni2P nanosheet arrays on nickel foam (Ni2P/NF) at a low temperature of 250 °C.
  • The H2 plasma activation of red phosphorus enabled a safer synthesis route, avoiding toxic PH3.
  • The Ni2P/NF electrode exhibited excellent HER activity and good mechanical strength, along with acid stability.

Conclusions:

  • H2 plasma-activated red phosphorus offers a safe and efficient pathway for low-temperature Ni2P synthesis.
  • The resulting Ni2P/NF nanosheet arrays are highly effective electrocatalysts for the hydrogen evolution reaction.
  • This method provides a viable alternative for producing advanced HER catalysts.