A hierarchical WC/NiCoW hollow nanotube array as a highly efficient electrocatalyst for hydrogen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The hydrogen evolution reaction (HER) is crucial for sustainable hydrogen production.
• Developing efficient and cost-effective electrocatalysts for HER is a significant challenge.
• Bubble aggregation and reaction retardation hinder catalyst performance.

Purpose of the Study:

• To synthesize a novel hierarchical WC/NiCoW hollow nanotube array electrocatalyst.
• To investigate the structural and electrochemical properties of the catalyst for HER.
• To understand the mechanistic insights governing the enhanced HER kinetics.

Main Methods:

• Synthesis of hierarchical WC/NiCoW hollow nanotube arrays.
• Electrochemical characterization including HER activity and stability tests.
• Mechanistic studies to probe electron transfer and reaction steps.

Main Results:

• The synthesized WC/NiCoW hollow nanotube array facilitates rapid gas release, minimizing bubble aggregation.
• Enhanced electron transfer at the WC-NiCoW interface and an accelerated Volmer step were observed.
• The optimized WC/NCW-600 catalyst showed superior HER activity and over 72 hours of stability in acidic, neutral, and alkaline media.

Conclusions:

• Rational structural design of hierarchical hollow nanotubes is effective for advanced electrocatalysts.
• The WC/NiCoW electrocatalyst offers a promising solution for efficient and durable hydrogen production.
• This work provides new insights into designing robust electrocatalysts for sustainable energy applications.