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Stabilizing and Activating Metastable Nickel Nanocrystals for Highly Efficient Hydrogen Evolution Electrocatalysis.

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Manganese doping enhances metastable hexagonal-close-packed nickel (hcp Ni) for efficient alkaline hydrogen evolution reaction (HER). This cost-effective electrocatalyst offers high activity and stability, approaching platinum performance.

Keywords:
dopinghexagonal-close-packedhydrogen evolution reactionmetastablenickel

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing high-performance, cost-efficient electrocatalysts for hydrogen evolution reaction (HER) is crucial but challenging.
  • Metastable phases in electrocatalysts offer potential for improved activity and stability.
  • Understanding doping effects on metastable materials is key to unlocking their catalytic potential.

Purpose of the Study:

  • To investigate the impact of doping engineering on metastable hexagonal-close-packed nickel (hcp Ni) for alkaline HER.
  • To achieve an extremely active and stable electrocatalyst for efficient electrochemical hydrogen generation.
  • To explore the role of manganese (Mn) doping in enhancing the stability and activity of hcp Ni.

Main Methods:

  • Theoretical predictions and experimental validation were employed.
  • Manganese (Mn) doping was introduced into the metastable hcp Ni structure.
  • Electrochemical performance was evaluated using techniques like chronopotentiometry and Tafel slope analysis.

Main Results:

  • Manganese doping significantly improved the stability of metastable hcp Ni by lowering formation energy and stabilizing the lattice.
  • The MnO/hcp Ni surface demonstrated enhanced HER activity due to favorable water adsorption and dissociation kinetics.
  • The Mn-doped hcp Ni electrocatalyst achieved a low overpotential (80 mV at 10 mA/cm²) and Tafel slope (68 mV/dec), comparable to commercial Pt/C.

Conclusions:

  • Doping engineering is a critical, yet underexplored, strategy for optimizing metastable electrocatalysts.
  • Manganese-doped hcp Ni represents a highly active and stable non-noble metal electrocatalyst for alkaline HER.
  • This work highlights the potential of metastable materials and doping strategies for advancing electrochemical hydrogen production.