Abstract
Sodium borohydride was once looked at as a promising way to store hydrogen for use in polymer electrolyte membrane (PEM) fuel cells. Concerns regarding hydrogen storage capacity and sustainability of the reactants resulted in its disqualification as a viable hydrogen source in transportation vehicles. Sodium borohydride is still a promising hydrogen storage medium to meet power demands for applications such as remote sensor networks and off-grid communications. In this paper, we discuss the use of acid accelerators to enhance the borohydride hydrolysis reaction when combined with solid borohydride and liquid water. Specifically, we report results for hydrochloric acid, sulfuric acid, citric acid, and acetic acid. As a first approximation, yield of the reaction is above 90% for all these acids and a zero-order dependence on pH was observed.
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