Liquid-phase chemical hydrogen storage materials

TLDR

Hydrogen is a promising energy carrier, but its widespread adoption is hindered by storage challenges; liquid‑phase chemical hydrogen storage materials such as aqueous sodium borohydride, ammonia borane, hydrazine, hydrazine borane, and formic acid offer high gravimetric and volumetric densities, low risk, and compatibility with existing transport infrastructure. This review surveys recent progress in hydrogen generation from these liquid‑phase chemical hydrogen storage materials and their regeneration. The authors compile and analyze studies on the generation and regeneration of hydrogen from these materials, providing a comprehensive overview of current research.

Abstract

In the search for future energy supplies, the application of hydrogen as an energy carrier is seen as a prospective issue. However, the implementation of a hydrogen economy is suffering from several unsolved problems. Particularly challenging is the storage of appropriate amounts of hydrogen. In this context one of the promising hydrogen storage techniques relies on liquid-phase chemical hydrogen storage materials, in particular, aqueous sodium borohydride, ammonia borane, hydrazine, hydrazine borane and formic acid. The use of these materials in hydrogen storage provides high gravimetric and volumetric hydrogen densities, low potential risk, and low capital investment because it is largely compatible with the current transport infrastructure. In this review, we survey the research progresses in hydrogen generation from these liquid-phase chemical hydrogen storage materials and their regeneration.