South Korean researchers develop cost-effective green hydrogen catalyst

A groundbreaking catalyst that could dramatically lower the cost of green hydrogen production has been developed by a joint research team from Chung-Ang University and the Korea Institute of Science and Technology (KIST).

The new catalyst utilizes non-precious metals, specifically a multi-metal phosphide nanoparticle (Co-Ni-Fe-P), to achieve performance comparable to expensive precious metal catalysts like platinum and iridium. Traditionally, these precious metals are essential for efficient water electrolysis, the process used to produce green hydrogen, but their high cost has been a major barrier to commercialization.

Researchers focused on anion exchange membrane (AEM) electrolysis, a promising alternative that reduces reliance on precious metals. However, existing non-precious metal catalysts often suffer from poor durability and efficiency in real operating conditions due to surface structure instability. The team's innovation lies in optimizing the cobalt content within the catalyst, which they discovered stabilizes the active structure on the catalyst's surface during operation. This 'surface reconstruction' phenomenon was identified as the key to maintaining high catalytic activity and long-term durability.

In rigorous testing, the new catalyst demonstrated exceptional performance. When applied to both the hydrogen and oxygen electrodes of an AEM electrolyzer, it achieved a high current density of 5.73 A/cm² at 2.0V. Even when used solely on the oxygen electrode, it recorded an impressive 11.43 A/cm² at 2.0V. Furthermore, the catalyst exhibited remarkable longevity, maintaining stable operation for over 500 hours at a commercial operating condition of 1.0 A/cm² without performance degradation.

This achievement is significant because it proves that non-precious metal catalysts can rival the performance of traditional precious metal-based electrolyzers. The research, published in the journal 'Advanced Functional Materials,' provides a comprehensive approach from catalyst composition control to real-time analysis of surface changes during operation, greatly enhancing its practical applicability and paving the way for more affordable and sustainable hydrogen energy.

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This research holds academic significance in precisely controlling the composition of non-precious metal multi-metal phosphide catalysts and clearly elucidating the principles of surface changes during operation through real-time analysis. It will serve as a milestone for developing low-cost electrolyzer electrodes that can achieve both high performance and high durability while reducing production costs by replacing expensive precious metal catalysts.