An international study with researchers from China, Spain, Germany and Korea advances low-cost, efficient green energy solutions. They describe how, in alkaline environments, nickel sulfide (NiS) electrodes transform into a mix of Ni3S2 and NiO, creating highly active sites that enhance hydrogen production. Synchrotron light experiments at CLAESS beamline were key to observe this transformation in real time, providing insights into how these changes improve the catalyst’s performance.
Unlocking hydrogen as an energy source is essential for the global green transition. However, current hydrogen production methods remain extremely energy-intensive and produce significant carbon dioxide emissions. Water electrolysis, which splits water into hydrogen and oxygen using renewable energy, offers a promising solution. To improve this process, developing low-cost, high-performance electrocatalysts is crucial. These catalysts speed up reactions and lower the activation energy required, particularly in the alkaline conditions common in industry. Current research focuses on creating efficient catalysts with dual active sites using inexpensive, abundant materials like metal chalcogenides, phosphides, and carbides. Despite progress, understanding the exact reaction mechanisms and active sites in alkaline conditions remains challenging.
In a recent study published in Nature Communications, researchers revealed that nickel sulfide (NiS) electrodes transform during use in alkaline conditions, forming highly active dual sites at the Ni3S2/NiO interface. This restructuring greatly enhances catalytic activity, significantly improving their efficiency in the hydrogen evolution reaction (HER). The work involved researchers from Xiamen and Fudan Universities (China), IMDEA Energy (Spain) alongside scientists from the ALBA Synchrotron, the Technical University of Darmstadt (Germany) and the Ulsan National Institute of Science and Technology (UNIST) (Republic of Korea).
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