Publication date: 15th December 2025
The pursuit of environmentally sustainable energy solutions has placed significant focus on hydrogen production and storage for industrial applications. Developing efficient technologies for storing and transporting hydrogen is crucial, and Liquid Organic Hydrogen Carriers (LOHCs) present a promising strategy.[1-5] Traditionally, the hydrogenation (loading) and dehydrogenation (releasing) of LOHC pairs rely on costly metal catalysts, often requiring high temperatures and high pressures using molecular hydrogen.
In response to these challenges, a more sustainable approach is being explored using electrocatalysis in aqueous media. Herein we propose the reversible hydrogenation and dehydrogenation of an amine/nitrile pair under mild conditions, establishing this pair as a potentially effective LOHC system.[6] Specifically, a green, selective, and efficient electrochemical synthesis is proposed to convert amines into nitriles. This process avoids harsh reaction conditions and has the significant advantage of producing molecular hydrogen as the sole byproduct. Furthermore, this innovative approach includes the design and synthesis of metallic electrodes specifically optimized to facilitate the reverse reaction: the reduction of nitriles into amines. This comprehensive methodology has demonstrated high efficiency, achieving conversion > 90%. These advancements collectively contribute to a reversible hydrogenation/dehydrogenation cycle, providing a viable, high-efficiency, and potentially scalable solution for industrial hydrogen storage applications.
Authors acknowledge the European Commission Horizon Europe Program via PeCATHs (Grant Agreement no. 101191948) and project UJI-B2022-33 funded by University Jaume I.
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