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Highly Electroactive Ni Pyrophosphate/Pt Catalyst toward Hydrogen Evolution Reaction.

Jayaraman Theerthagiri1, Eduardo S F Cardoso2, Guilherme V Fortunato2

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ACS Applied Materials & Interfaces
|January 10, 2019
PubMed
Summary

This study presents a novel, cost-effective electrocatalyst, β-Ni2P2O7/Pt, for efficient hydrogen production via water splitting. This platinum-decorated catalyst demonstrates excellent performance and durability, rivaling commercial benchmarks with significantly less platinum.

Keywords:
hydrogen evolution reactionnickelphosphateplatinumpyrophosphate

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Developing robust electrocatalysts for sustainable hydrogen generation through water splitting is crucial for energy research.
  • Reducing the high loading of platinum (Pt) in electrocatalysts is essential for cost-effective and efficient water splitting technologies.

Purpose of the Study:

  • To synthesize and evaluate novel, low-Pt loading electrocatalysts based on nickel pyrophosphate (β-Ni2P2O7) and nickel phosphate (Ni3(PO4)2) decorated with platinum for the hydrogen evolution reaction (HER).
  • To investigate the electrocatalytic performance and durability of these materials for efficient hydrogen production.

Main Methods:

  • Hierarchically structured β-Ni2P2O7 and Ni3(PO4)2 were synthesized using precipitation and solution combustion methods.
  • Platinum nanoparticles (Pt NPs) were decorated onto the nickel phosphate materials (β-Ni2P2O7/Pt and Ni3(PO4)2/Pt) using potassium hexachloroplatinate and ascorbic acid.
  • Electrochemical studies, including overpotential, Tafel slope, and exchange current density measurements, were conducted to assess HER performance and stability.

Main Results:

  • The β-Ni2P2O7/Pt electrocatalyst (1 μg·cm-2 Pt) exhibited excellent HER performance in acidic solution, with an overpotential of 28 mV at -10 mA·cm-2 and a Tafel slope of 32 mV·dec-1.
  • Performance metrics were comparable to commercial Vulcan/Pt (8.0 μg·cm-2 Pt) but with eight times less platinum loading.
  • The β-Ni2P2O7/Pt catalyst demonstrated remarkable stability, maintaining its performance after 12 days of testing, attributed to well-distributed Pt NPs within the β-Ni2P2O7 structure facilitating the Volmer-Tafel mechanism.

Conclusions:

  • The synthesized β-Ni2P2O7/Pt material is a highly promising, cost-effective electrocatalyst for efficient hydrogen production via water splitting.
  • The hierarchical structure and Pt NP distribution contribute to superior catalytic activity and durability, offering a viable alternative to high-Pt loading catalysts.