Promoted hydrogen release from 3LiBH4/MnF2 composite by doping LiNH2: Elimination of diborane release and reduction of decomposition temperature |
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| Authors: | Yun Song Fang Fang Yongtao Li Qiyang Zhao Dalin Sun Qingan Zhang Liuzhang Ouyang Min Zhu |
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| Affiliation: | 1. Department of Materials Science, Fudan University, Shanghai 200433, China;2. School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China;3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | The evolution of diborane accompanying H2 release during the decomposition of transition metal borohydrides reduces the purity of evolved hydrogen and results in capacity loss during cycling. To solve the problem, a small amount of LiNH2 is doped into a 3LiBH4/MnF2 composite and the decomposition properties are investigated. The results show that after doping LiNH2, the formation of diborane during decomposition is effectively suppressed meanwhile the decomposition temperature is significantly reduced. Around 5 wt.% pure hydrogen can be released at 95–140 °C from 5 wt.% LiNH2-doped 3LiBH4/MnF2 composite. These improvements in the decomposition performance are mainly attributed to the prevention of the formation of B–H–B bonds for B2H6 and the destabilization of B–H bonds in borohydrides by the interaction of BH4− and NH2−. |
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| Keywords: | Hydrogen storage Transition metal borohydride Doping Decomposition |
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