High-Entropy Alloys for Hydrogen Production

February 4, 2025

Recent advancements in clean energy technology have brought into light the potential of high-entropy alloys (HEAs) for hydrogen production. These innovative materials can reduce the reliance on precious metals such as platinum. Researchers at the Centre for Nano and Soft Matter Sciences (CeNS) in Bengaluru have developed a new HEA catalyst, PtPdCoNiMn, which demonstrates enhanced efficiency in the electrolysis of water.

About High-Entropy Alloys

High-entropy alloys are metallic substances containing multiple elements, typically five or more, in nearly equal proportions. Their unique composition leads to increased stability and versatility. Unlike traditional alloys, HEAs rely on entropy to stabilise their structure, which allows for improved performance in various applications, including catalysis.

Catalyst Development Process

The CeNS researchers created the PtPdCoNiMn HEA catalyst using two distinct methods – electrodeposition and solvothermal synthesis.
The electrodeposition method was optimised for solvent choice and deposition potential, allowing for precise control over the alloy formation.
The solvothermal method involved careful selection of solvents and reducing agents to fine-tune the reaction and synthesis process.

Performance and Efficiency

The PtPdCoNiMn catalyst showed remarkable efficiency in hydrogen production.
It utilised seven times less platinum compared to conventional catalysts while maintaining superior catalytic performance.
The optimal binding of reaction intermediates on the catalyst surface contributed to its effectiveness.
This HEA has demonstrated high durability and stability, operating efficiently even in alkaline seawater environments for over 100 hours.

Practical Applications and Impact

This breakthrough in HEA development could revolutionise hydrogen production, making it cleaner and more affordable. The ability to use less expensive materials without compromising efficiency presents advantage for industries reliant on hydrogen. The research contributes to the broader goal of advancing renewable energy technologies and reducing reliance on fossil fuels.

Funding and Publication

The research was supported by India’s Anusandhan National Research Foundation (ANRF), which is administered by the Department of Science and Technology (DST). Findings from this research were published in reputable journals, including Advanced Functional Materials and Small, further validating the significance of this work within the scientific community.

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