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为改善新型高容量储氢材料Mg(BH4)2·2NH3的放氢性能,使用XRD、FTIR、TPD和Sieverts测试仪研究了KBF4的添加对Mg(BH4)2·2NH3放氢性能的影响。研究结果表明:KBF4与Mg(BH4)2·2NH3在球磨过程中可以发生相互作用,导致F部分替代[BH4]-中的H。F的掺杂显著降低了Mg(BH4)2·2NH3的放氢温度,其中10%(摩尔分数)F掺杂的Mg(BH4)2·2NH3的起始放氢温度为50℃,较原始Mg(BH4)2·2NH3降低了100℃,当加热至350℃,主要放氢反应结束,放氢量可达10%(质量分数);同时,F的掺杂还显著提高了Mg(BH4)2·2NH3的放氢动力学性能。
In order to improve the hydrogen desorption performance of Mg (BH4) 2.2NH3, a new type of high capacity hydrogen storage material, the effect of KBF4 addition on the desorption performance of Mg (BH4) 2.2NH3 was investigated by XRD, FTIR, TPD and Sieverts tester. The results show that KBF4 and Mg (BH4) 2 · 2NH3 can interact during ball milling, resulting in the substitution of F moiety for [BH4] -. The doping temperature of Mg (BH4) 2.2NH3 significantly decreases the hydrogen releasing temperature of Mg (BH4) 2.2NH3, and the initial hydrogen desorption temperature of 50% F (Mg4Br2NH3) (BH4) 2.2NH3 decreases by 100 ℃. When heated to 350 ℃, the main hydrogen desorption reaction is completed and the hydrogen desorption capacity can reach 10% (mass fraction). Meanwhile, the doping of F also increases the content of Mg (BH4) 2 · 2NH3 discharge kinetic performance.