What is it about?
Alkaline hydrogen evolution reaction is of great significance as a way to produce green hydrogen while using non-precious catalysts. We have developed a new composite catalyst entirely composed of non-noble elements to overcome the kinetic limitations that have hindered efficient HER in alkaline media. Our catalyst owes its efficiency to the presence of bridging oxygen that acts as a relay to transport the hydrogen intermediate among catalytic sites. Using DFT and isotope experiments, we show that the HER pathway follows the Tafel mechanism, rarely observed in alkaline media.
Photo by Magic Keegan on Unsplash
Why is it important?
Our findings highlight new ways to design non-noble catalysts for high-efficiency alkaline HER electrocatalysis. In our catalyst, the catalytic sites are bonded via bridging oxygen, which plays as critical role in adsorbing and relaying intermediate H*, thereby enabling a sustained high performance in alkaline media.
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This page is a summary of: Composite non-noble system with bridging oxygen for catalyzing Tafel-type alkaline hydrogen evolution, Proceedings of the National Academy of Sciences, December 2022, Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.2209760120.
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