Precious Metal Free Hydrogen Evolution Catalyst Design and Application

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• The search for cost-effective, precious metal-free catalysts for hydrogen evolution reactions (HER) is a critical area of research.
• These catalysts are essential for the commercial viability of low-temperature electrolyzers used in hydrogen production.

Purpose of the Study:

• To review and critically analyze recent advancements in precious metal-free HER catalysts for both acidic and alkaline electrolytes.
• To evaluate common performance metrics, experimental methodologies, and catalyst design strategies.
• To discuss the crucial transition from laboratory-scale testing to single-cell evaluations for industrial scalability.

Main Methods:

• Comprehensive literature review of precious metal-free HER catalysts.
• Analysis of catalyst activity and stability measurements in half-cell and two-electrode configurations.
• Comparison of catalyst performance across different material families (e.g., MoS2, transition metal phosphides, carbides).

Main Results:

• Detailed assessment of catalyst performance metrics and experimental best practices.
• Identification of key catalyst families for acidic (MoS2-based, TMPs, TCs) and alkaline (NiMo, TMPs) electrolytes.
• Observation of a recent stagnation in enhancing the intrinsic activity of precious metal-free HER catalysts.

Conclusions:

• Precious metal-free HER catalysts are vital for advancing electrolyzer technology.
• Standardized testing and a focus on single-cell performance are needed for industrial scale-up.
• Future research should address the current limitations in intrinsic activity enhancement for these catalysts.