Mg hydride is a competitive candidates for hydrogen storage based on its high gravimetric hydrogen capacity and accessibility. In this study, a small amount of KOH and graphene were added into MgH₂ by high energy ball milling. MgH₂ doped with both KOH and graphene has a greatly improved hydrogen storage performance. The existence of graphene and the in-situ formed KMgH₃ and MgO decreased activation energy of MgH₂ to 109.89 ± 6.03 kJ/mol. The both KOH and graphene doped sample has a reversibly capacity of 5.43 wt % H₂ and can released H₂ as much as 6.36 times and 1.84 times faster than those of undoped sample and only KOH doped sample at 300 °C, respectively. The addition of graphene not only can provide more “H diffusion channels”, but also can disperse the catalyst.

氢化镁因其高重量氢容量和可及性而成为储氢的竞争性候选物。在这项研究中，通过高能球磨将少量的KOH和石墨烯添加到MgH _2中。掺有KOH和石墨烯的MgH ₂具有大大改善的储氢性能。石墨烯的存在以及原位形成的KMgH ₃和MgO将MgH _2的活化能降低到109.89±6.03 kJ / mol。掺杂KOH和石墨烯的样品均具有5.43 wt％H ₂的可逆容量，并且可以释放H ₂在300°C时分别比未掺杂样品和仅KOH掺杂样品快6.36倍和1.84倍。石墨烯的添加不仅可以提供更多的“ H扩散通道”，而且可以分散催化剂。