Development of Mn(i)-based catalysts for CO₂ hydrogenation/dehydrogenation in the context of hydrogen storage/release systems

This chapter provides a comprehensive overview of recent advancements in Mn(i)-catalysed hydrogenation and dehydrogenation reactions, with a focus on their application in hydrogen storage systems. It explores the reactivity of Mn(i) complexes and their formate analogues, as well as their catalytic mechanisms, highlighting the potential of these catalysts to contribute to a circular carbon economy. The chapter investigates the use of carbonate and hydroxide salts as well as amines as environmentally friendly materials for hydrogen storage, demonstrating substantial efficiency and high hydrogen evolution yield with excellent reloading purity. The systems’ operation below 100 °C suggests the possibility of waste heat management and integration into the storage process. The chapter also discusses the challenges and limitations encountered, such as the decreased yield in subsequent cycles and the solubility issues of certain CO₂ absorbents. Overall, the chapter presents Mn(i) catalysts as promising candidates for renewable energy applications, offering insights into current challenges and future perspectives for the development of efficient, affordable, and sustainable hydrogen storage technologies.