Two dual-cation transition metal fluorides K₂TiF₆ and K₂NbF₇ are introduced into Mg(BH₄)₂ by ball-milling to catalyze the dehydrogenation of Mg(BH₄)₂. According to the DSC and TPD results, the onset dehydrogenation temperature of Mg(BH₄)₂ doped with K₂TiF₆ and K₂NbF₇ are remarkably reduced to 105.4 and 118.0 °C, respectively. Meanwhile, both the K₂TiF₆ and K₂NbF₇ catalyzed systems can release more than 6.4 wt% H₂ under 280 °C, showing an improvement in dehydrogenation kinetics. In addition, the reversible capacity of the Mg(BH₄)₂–3%K₂TiF₆ system is 2.7 wt% at 280 °C in 250 min, which is enhanced comparing to that of pristine Mg(BH₄)₂. X-ray diffraction, Fourier-transformed infrared and ¹¹B nuclear magnetic resonance investigations reveal that the K₂TiF₆ actually acts as a catalytic precursor to react with Mg(BH₄)₂, forming active hydrides of KBH₄ and TiH₂, which further serve as catalyzing agents to facilitate the re-generation of Mg(BH₄)₂ from intermediates under moderate conditions.

通过球磨将两种双阳离子过渡金属氟化物K ₂ TiF ₆和K ₂ NbF ₇引入Mg（BH ₄）_2中，以催化Mg（BH ₄）₂的脱氢。根据DSC和TPD结果，掺杂有K ₂ TiF ₆和K ₂ NbF ₇的Mg（BH ₄）₂的起始脱氢温度分别显着降低至105.4和118.0℃。同时，K ₂ TiF ₆和K ₂ NbF ₇催化体系在280°C下可释放超过6.4 wt％的H ₂，显示出脱氢动力学的改善。此外，Mg（BH ₄）₂ –3％K ₂ TiF ₆体系在280°C下250分钟内的可逆容量为2.7 wt％，这与原始Mg（BH ₄）₂的可逆容量相比有所提高。X射线衍射，傅立叶变换红外光谱和¹¹ B核磁共振研究表明，K ₂ TiF ₆实际上充当与Mg（BH ₄）₂反应的催化前体，形成KBH ₄和TiH的活性氢化物₂进一步充当催化剂以促进在中等条件下从中间体再生Mg（BH ₄）₂。