Hydrogen Production from Ammonia Borane Hydrolysis Catalyzed by Metal Oxide-Based Materials

Ammonia borane (AB, NH 3 BH 3 ) has received much attention as a hydrogen storage material because of its high hydrogen content (19.6 wt %), low molecular weight, high solubility, high stability and non-toxicity. However, the rate of hydrogen release from AB in pure water is slow, so the development of catalysts has been a hot topic of research. A variety of high-performance catalysts have been developed to catalyze the hydrolysis of AB, but the oxidation and agglomeration of transition metals has affected their activity and stability. Metal oxides have attracted the interest of researchers as catalysts to solve this problem and various metal oxides have been developed to catalyze hydrogen production from AB hydrolysis. Therefore, a systematic analysis and summary of metal oxide-based catalysts can provide a better understanding of the development and guide for subsequent research. This review summarizes the progress of research on metal oxide-based catalysts, which is divided into two main categories: carbon-free support catalysts and carbon-based support catalysts. We emphasized on preparation methods, compositional structures, methods for performance optimization and hydrolysis mechanisms of catalysts. In addition, perspective of metal oxide catalysts are provided based on current research.