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Thesis
Home   /   Thesis   /   Electrochemical and chemical regeneration of hydrogen storage materials based on ammine metal borohydrides

Electrochemical and chemical regeneration of hydrogen storage materials based on ammine metal borohydrides

Abstract

Hydrogen is considered as the energy carrier of tomorrow. However, in addition to the fact that the production and distribution chain is not yet operational, there are real scientific, technological and economic barriers to its storage for mobile or stationary applications. Although, there are storage solutions in compressed or chemisorbed form in metal hydrides, the performance and associated costs of these solutions only partially fulfil the specifications of the various applications. This is why research has increased significantly in the last decade on hydrogen storage materials, particularly complex chemical hydrides, which have the major advantage of larger storage capacity in hydrogen. One of the interesting compounds developed by CEA LITEN focuses on the family of metal borohydrides complexed with ammonia. Several ammine metal borohydride compounds desorb more than 10% hydrogen at moderate temperatures (<200°C). However, thermodynamics does not allow direct rehydrogenation of amorphous metal boron nitride by-products. Hence, the chemical regeneration of the compounds remain as the main challenge for unlocking their commercial potential. LITEN has unique experience on chemical regeneration pathways of these compounds. This thesis project will expand and improve upon the regeneration process by a novel electrochemical approach. The research activities will benefit from a custom electrochemical cell that can operate up to 200 °C and 20 bar hydrogen pressure conditions. The ultimate goal is the development energy efficient regeneration process for ammine metal borohydrides.

Laboratory

Département des Technologies des NanoMatériaux (LITEN)
Service des Technologies Durables pour le Cycle des matières (DRT)
Laboratoire des technologies de valorisation des procédés et des matériaux pour les EnR
Montpellier
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