Instability of the CuCl2-NH3BH3 mixture followed by TGA and DSC

► Ammonia borane NH3BH3 (AB) destabilization can be achieved by adding CuCl2. ► The stability of CuCl2-AB when stored under Ar at 20 °C over 6 months was assessed. ► CuCl2-NH3BH3 evolves with time, decomposing at slow kinetics. ► Long-term storage of CuCl2-AB is inconceivable for safety and performances reasons.