A novel strategy for reversible hydrogen storage in Ca(BH4)2

Abstract

We report that decomposition pathway of Ca(BH₄)₂ can be efficiently controlled by reaction temperature. That is, it decomposes into CaB₆ at a lower temperature range of 320 to 350 °C, but into amorphous boron at 400 to 450 °C. We identified the formation of CaB₂H₆ as the crucial intermediate step on the way to CaB₆ that only forms at 320 to 350 °C.