CoP@Ni core-shell heterostructure nanowire array: A highly efficient electrocatalyst for hydrogen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Non-precious metal catalysts often suffer from suboptimal intermediate adsorption, limiting their efficiency in electrocatalytic hydrogen evolution.
• Developing efficient and cost-effective electrocatalysts is crucial for sustainable hydrogen production.

Purpose of the Study:

• To design and synthesize a novel core-shell heterostructure catalyst for improved electrocatalytic hydrogen evolution.
• To investigate the electronic structure and catalytic activity of the CoP@Ni heterostructure.

Main Methods:

• Hydrothermal reaction, thermal phosphorization, and electrodeposition were used to create the CoP@Ni core-shell nanowire array.
• Electrocatalytic performance was evaluated in alkaline electrolyte.
• Theoretical calculations were performed to understand the electronic structure and reaction mechanism.

Main Results:

• The CoP@Ni core-shell heterostructure exhibited excellent activity for hydrogen evolution, requiring only 71 mV overpotential to achieve 10 mA cm⁻².
• The catalyst demonstrated a low Tafel slope of 66 mV dec⁻¹, indicating efficient charge transfer.
• Theoretical analysis revealed metallic characteristics and a zero-bandgap, facilitating charge transfer and lowering the reaction energy barrier.

Conclusions:

• The CoP@Ni core-shell heterostructure significantly enhances intrinsic catalytic activity for hydrogen evolution by optimizing intermediate adsorption.
• Constructing heterostructures is a viable strategy for developing high-performance, cost-effective electrocatalysts for hydrogen production.