Dual chalcogenide coordination engineering on a self-supported alloy electrode for enhanced hydrogen evolution...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The electrochemical hydrogen evolution reaction (HER) is crucial for green hydrogen production.
• Developing cost-effective and high-performance catalysts is essential for scalable HER.
• Transition-metal chalcogenides offer a promising route for advanced HER catalysts.

Purpose of the Study:

• To synthesize and evaluate a novel, self-supported, three-dimensional nano-catalyst for enhanced HER performance.
• To investigate the effect of dual sulfur and selenium incorporation on catalyst properties and HER kinetics.
• To explore the potential of the new catalyst for efficient alkaline water electrolysis.

Main Methods:

• One-step chemical vapor deposition (CVD) to synthesize a nano three-dimensional self-supported catalyst (CNSSe).
• Incorporation of dual sulfur (S) and selenium (Se) onto a Monel alloy framework.
• Density functional theory (DFT) calculations to analyze hydrogen adsorption free energy (ΔG_H*).

Main Results:

• The synthesized CNSSe catalyst demonstrated a favorable ΔG_H* of 0.105 eV, indicating low hydrogen coverage.
• Dual S and Se introduction led to heterogeneous catalyst structures and improved reaction kinetics.
• The optimized CNSSe electrocatalyst exhibited over 100% enhanced HER performance compared to single-element catalysts.

Conclusions:

• The novel CNSSe electrocatalyst significantly boosts HER performance in alkaline media.
• The catalyst's efficiency is attributed to its unique structure and the synergistic effect of dual S and Se.
• This development holds substantial potential for improving the performance and economic viability of green hydrogen production technologies.