Enhanced Effect of an External Electric Field on NH(3)BH(3) Dehydrogenation: an AIMD Study for Thermolysis.
Enhanced Effect of an External Electric Field on NH(3)BH(3) Dehydrogenation: an AIMD Study for Thermolysis.
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外部电场对 NH3BH3 脱氢的增强作用:热解的 AIMD 研究
DOI:
10.1021/acsomega.2c02401
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发表时间:
2022-06-21
期刊:
影响因子:
4.1
通讯作者:
Ji, Guang-Fu
中科院分区:
文献类型:
--
作者:
Huang, Yao-Yao;Ji, Lin-Xiang;He, Zheng-Hua;Ji, Guang-Fu
How to improve the dehydrogenation properties of ammonia borane (AB, NH3BH3) is always a challenge for its practical application in hydrogen storage. In this study, we reveal the enhanced effect of an external electric field (Eext) on AB dehydrogenation by means of the ab initio molecular dynamics method. The molecular rotation induced by an electrostatic force can facilitate the formation of the H–N···B–H framework, which would aggregate into poly-BN species and further suppress the generation of the volatile byproducts. Meanwhile, the dihydrogen bond (N–Hδ+···δ−H–B) is favorably formed under Eext, and the interaction between relevant H atoms is enhanced, leading to a faster H2 liberation. Correspondingly, the apparent activation energy for AB dissociation is greatly reduced from 18.42 to around 15 kcal·mol–1 with the application of an electric field, while that for H2 formation decreases from 20.4 to about 16 kcal·mol–1. In the whole process, the cleavage of the B–H bond is more favorable than that of the N–H bond, no matter whether the application of Eext. Our results give a deep insight into a positive effect of an electric field on AB dehydrogenation, which would provide an important inspiration for hydrogen storage in industry applications.
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