Carbon neutral hydrogen storage and release cycles based on dual-functional roles of formamides.

Nat Commun

Leibniz-Institut für Katalyse e.V, 18059, Rostock, Germany.

Published: June 2023

The development of alternative clean energy carriers is a key challenge for our society. Carbon-based hydrogen storage materials are well-suited to undergo reversible (de)hydrogenation reactions and the development of catalysts for the individual process steps is crucial. In the current state, noble metal-based catalysts still dominate this field. Here, a system for partially reversible and carbon-neutral hydrogen storage and release is reported. It is based on the dual-functional roles of formamides and uses a small molecule Fe-pincer complex as the catalyst, showing good stability and reusability with high productivity. Starting from formamides, quantitative production of CO-free hydrogen is achieved at high selectivity ( > 99.9%). This system works at modest temperatures of 90 °C, which can be easily supplied by the waste heat from e.g., proton-exchange membrane fuel cells. Employing such system, we achieve >70% H evolution efficiency and >99% H selectivity in 10 charge-discharge cycles, avoiding undesired carbon emission between cycles.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10287642PMC
http://dx.doi.org/10.1038/s41467-023-39309-4DOI Listing

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