Perspectives and challenges of metal boron hydrides for energy applications
(2017) E-MRS Fall Meeting — Location: Warsaw, Poland (18.September.2017)
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- Metal boron hydrides M(BxHy)n have been attracting increasing interest from the energy applications point of view, especially in the context of solid-state hydrogen storage, superionic conductivity and CO2 conversion [1]. Metal tetrahydroborate M(BH4)n like LiBH4, Mg(BH4)2 and Ca(BH4)2, with hydrogen gravimetric density higher than 10 mass%, have been extensively investigated for high density hydrogen storage [2]. Metal dodecaborate M2(B12H12)n with a stable icosahedral cage structure, known as the dehydrogenation intermediate of M(BH4)n, has been widely regarded as one of the main reasons responsible for the degraded re-hydrogenation [3]. M2(B12H12)n, on the other hand, favors its potential application as superionic conductor. Recently, we found that the ionic conductivity of a bimetallic dodecaborate LiNaB12H12 could reach 0.79 S/cm at 550 K above its order-disorder phase transition. This value is 10 times higher than that of its single counterpart of Li2B12H12 and Na2B12H12 at the same temperature [4]. Furthermore, we found that metal tetrahydroborate KBH4 is capable of converting CO2 to methanol and methane in water-free conditions without using catalyst [5]. In the presentation, we will overview the recent progresses and discuss the perspectives and challenges of metal boron hydrides for energy-related applications.
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Li H.-W., He L., Nakajima H., Filinchuk, Y., Hagemann H., Jensen T.R., & Akiba E. (2017). Perspectives and challenges of metal boron hydrides for energy applications. E-MRS Fall Meeting, Warsaw, Poland. https://hdl.handle.net/2078.5/126790