Superior de/hydrogenation performances of MgH2 catalyzed by 3D flower-like TiO2@C nanostructures
作者:Zhang, M (Zhang, Meng)[ 1 ] ; Xiao, XZ (Xiao, Xuezhang)[ 1,3 ] ; Luo, BS (Luo, Bosang)[ 1 ] ; Liu, MJ (Liu, Meijia)[ 1 ] ; Chen, M (Chen, Man)[ 1 ] ; Chen, LX (Chen, Lixin)[ 1,2 ]
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JOURNAL OF ENERGY CHEMISTRY
卷: 46 页: 191-198
DOI: 10.1016/j.jechem.2019.11.010
出版年: JUL 2020
文献类型:Article
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摘要
Magnesium hydride has been seen as a potential material for solid state hydrogen storage, but the kinetics and thermodynamics obstacles have hindered its development and application. Three-dimensional flower-like TiO2@C and TiO2 were synthesized as the catalyst for MgH2 system and great catalytic activities are acquired in the hydrogen sorption properties. Experiments also show that the flower-like TiO2@C is superior to flower-like TiO2 in improving the hydrogen storage properties of MgH2. The hydrogen desorption onset and peak temperatures of flower-like TiO2 doped MgH2 is reduced to 199.2 degrees C and 245.4 degrees C, while the primitive MgH2 starts to release hydrogen at 294.6 degrees C and the rapid dehydrogenation temperature is even as high as 362.6 degrees C. The onset and peak temperatures of flower-like TiO2@C doped MgH2 are further reduced to 180.3 degrees C and 233.0 degrees C. The flower-like TiO2 @C doped MgH2 composite can release 6.0 wt% hydrogen at 250 degrees C within 7 min, and 4.86 wt% hydrogen at 225 degrees C within 60 min, while flower-like TiO2 doped MgH2 can release 6.0 wt% hydrogen at 250 degrees C within 8 min, and 3.89 wt% hydrogen at 225 degrees C within 60 min. Hydrogen absorption kinetics is also improved dramatically. Moreover, compared with primitive MgH2 and the flower-like TiO2 doped MgH2, the activation energy of flower-like TiO2@C doped MgH2 is significantly decreased to 67.10 kJ/mol. All the improvement of hydrogen sorption properties can be ascribed to the flower-like structure and the two-phase coexistence of TiO2 and amorphous carbon. Such phase composition and unique structure are proved to be the critical factor to improve the hydrogen sorption properties of MgH2, which can be considered as the new prospect for improving the kinetics of light-metal hydrogen storage materials. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
关键词
作者关键词:Hydrogen storage; Magnesium hydride; TiO2; Flower-like structure; Catalytic effects
KeyWords Plus:HYDROGEN STORAGE PROPERTIES; MAGNESIUM-BASED MATERIALS; DESORPTION PROPERTIES; SORPTION KINETICS; DEHYDROGENATION; NANOPARTICLES; NANOTUBES; MECHANISM; GRAPHENE; CARBON
作者信息
通讯作者地址: Xiao, XZ; Chen, LX (通讯作者)
显示更多Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China.
地址:
显示更多[ 1 ] Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
[ 2 ] Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310013, Zhejiang, Peoples R China
显示更多[ 3 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China
电子邮件地址:xzxiao@zju.edu.cn; lxchen@zju.edu.cn
基金资助致谢
基金资助机构显示详情授权号
National Basic Research Program of China
2018YFB1502104
National Natural Science Foundation of China
51571179
51671173
Guangdong Provincial Key Laboratory of Advance Energy Storage Materials
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出版商
ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS
期刊信息
Impact Factor (影响因子): Journal Citation Reports
类别 / 分类
研究方向:Chemistry; Energy & Fuels; Engineering
Web of Science 类别:Chemistry, Applied; Chemistry, Physical; Energy & Fuels; Engineering, Chemical