Nanoporous V-Doped Ni₅P₄ Microsphere: A Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction at All pH

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• The global shift towards a hydrogen economy necessitates sustainable hydrogen production methods.
• Electrocatalytic water splitting is a key technology, but platinum group metal (PGM) catalysts are expensive and scarce.
• Non-PGM electrocatalysts often exhibit insufficient activity and durability for the hydrogen evolution reaction (HER).

Purpose of the Study:

• To develop a cost-effective, highly active, and durable non-PGM electrocatalyst for the hydrogen evolution reaction (HER).
• To investigate the potential of vanadium-doped nickel phosphide (V-Ni5P4) as an all-pH HER electrocatalyst.

Main Methods:

• Synthesis and characterization of vanadium-doped nickel phosphide (V-Ni5P4).
• Electrochemical evaluation of V-Ni5P4 for HER across a wide pH range.
• Comparison of V-Ni5P4 performance with platinum-based catalysts.

Main Results:

• V-Ni5P4 demonstrates excellent HER activity comparable to platinum in alkaline media.
• Achieved low overpotentials of 13 mV at 10 mA cm-2 and 295 mV at 1000 mA cm-2.
• The catalyst exhibits durability at ultrahigh current densities (A cm-2).

Conclusions:

• Vanadium-doped nickel phosphide (V-Ni5P4) is a promising, low-cost electrocatalyst for efficient and durable hydrogen production.
• This development supports the advancement of the hydrogen economy through sustainable water splitting technologies.