LiBH4-MgH2 system in a 2 : 1 molar ratio constitutes a representative reactive hydride composite (RHC) for hydrogen storage. However, sluggish kinetics and poor reversibility hinder the practical applications. To ease these problems, amorphous TiB2 and NbB2 nanoparticles were synthesized and employed as catalysts for the 2LiBH(4)-MgH2 system. Isothermal de-/rehydrogenation and temperature programmed mass spectrometry (MS) measurements show that amorphous TiB2 and NbB2 nanoparticles can significantly improve the hydrogen storage performance of the 2LiBH(4)-MgH2 system. 9 wt% hydrogen can be released within only 6 min for nanoTiB(2)-doped 2LiBH(4)-MgH2, while for the undoped composite limited hydrogen of 3.9 wt% is released in 300 min at 400 degrees C. The dehydrogenation activation energies for the first and second steps are dramatically reduced by 40.4 kJ mol(-1) and 35.2 kJ mol(-1) after doping with nanoTiB(2). It is believed that TiB2 and NbB2 nanoparticles can first catalyze the dehydrogenation of MgH2, and then induce the decomposition of LiBH4 and meanwhile act as nucleation agents for MgB2, thereby greatly enhancing the kinetics of dehydrogenation. The present study gives clear evidence for the significant performance of transition metal boride species in doped RHCs, which is critically important for understanding the mechanism and further improving the hydrogen storage properties of RHCs.
机构:
Nankai Univ, Inst New Energy Mat Chem, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Key Lab Adv Energy Mat Chem MOE,Tianjin Key Lab M, Tianjin 300071, Peoples R ChinaHunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China
Zhao, Yanping
Ding, Liangzhong
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Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R ChinaHunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China
Ding, Liangzhong
Zhong, Tongsheng
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Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R ChinaHunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China
Zhong, Tongsheng
Yuan, Huatang
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Nankai Univ, Inst New Energy Mat Chem, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Key Lab Adv Energy Mat Chem MOE,Tianjin Key Lab M, Tianjin 300071, Peoples R ChinaHunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China
Yuan, Huatang
Jiao, Lifang
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Nankai Univ, Inst New Energy Mat Chem, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Key Lab Adv Energy Mat Chem MOE,Tianjin Key Lab M, Tianjin 300071, Peoples R ChinaHunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China
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Univ Sci & Technol China, Hefei 230026, Peoples R China
Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R ChinaUniv Sci & Technol China, Hefei 230026, Peoples R China
Wang, Kuikui
Kang, Xiangdong
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Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R ChinaUniv Sci & Technol China, Hefei 230026, Peoples R China
Kang, Xiangdong
Zhong, Yujie
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Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R ChinaUniv Sci & Technol China, Hefei 230026, Peoples R China
Zhong, Yujie
Hu, Chaohao
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Guilin Univ Elect Technol, Guangxi Key Lab Informat Mat, Guilin 541004, Peoples R ChinaUniv Sci & Technol China, Hefei 230026, Peoples R China
Hu, Chaohao
Ren, Jianwei
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CSIR, HySA Infrastruct Ctr Competence Mat Sci & Mfg, ZA-0001 Pretoria, South AfricaUniv Sci & Technol China, Hefei 230026, Peoples R China
Ren, Jianwei
Wang, Ping
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Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R ChinaUniv Sci & Technol China, Hefei 230026, Peoples R China
机构:
Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R ChinaShanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China
Pan, Yanbiao
Leng, Haiyan
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Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R ChinaShanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China
Leng, Haiyan
Wei, Jia
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Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R ChinaShanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China
Wei, Jia
Li, Qian
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Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R ChinaShanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China