Remarkable hydrogen absorption/desorption behaviors and mechanism of sodium alanates in-situ doped with Ti-based 2D MXene
作者:Jiang, RC (Jiang, Ruicheng)[ 1 ] ; Xiao, XZ (Xiao, Xuezhang)[ 1,2 ] ; Zheng, JG (Zheng, Jiaguang)[ 1 ] ; Chen, M (Chen, Man)[ 1 ] ; Chen, LX (Chen, Lixin)[ 1 ]
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MATERIALS CHEMISTRY AND PHYSICS
卷: 242
文献号: 122529
DOI: 10.1016/j.matchemphys.2019.122529
出版年: FEB 15 2020
文献类型:Article
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摘要
MXene has proven to be an excellent catalyst for the energy storage materials. By doping MXene, the hydrogen absorption and desorption performances and cycling stability of NaAlH4 can be significantly improved. However, the preparation and doping of MXene still have a great influence on its catalytic performance. In this work, Ti3C2 with great morphology and high purity was prepared by MILD method (using HCl and fluoride salt instead of using HF). The as-synthesized MXene were in-situ doped into NaH/Al to prepare the Ti3C2-doped NaH/Al composite. At the temperature of 110 degrees C, the Ti3C2-doped NaH/Al composite uptakes 4.2 wt% H-2 within 4.5 min. The initial dehydrogenation temperature of Ti3C2-doped NaH/Al composite is reduced to 76 degrees C, which is one of the lowest dehydrogenation temperatures of the reported Ti-doped sodium alanate. Ti3C2-doped NaH/Al composite possesses much lower active energy (92.5 kJ/mol for the first step and 58.1 kJ/mol for the second step), compared with the as-milled NaAlH4. Ti3C2-doped NaH/Al composite also has an extraordinary cycling hydrogen absorption and desorption properties, 99% of initial capacity can be maintained after 10 cycles. After microstructure analysis, It can be found that after ball milling, Ti3C2 decomposed into Ti and TiFx nanoclusters, which uniformly distributed on the surface of NaH/Al particles. These active titanium acts as a fast channel for hydrogen absorption and desorption. Moreover, Ti3C2-doped NaH/Al composite has a higher content of high-valence Ti compared with Ti3C2-doped NaAlH4, which may explain why its hydrogen storage properties are better than that of Ti3C2-doped NaAlH4.
关键词
作者关键词:Sodium alanates; MXene; Hydrogen storage properties; Active titanium
KeyWords Plus:CATALYTIC-ACTIVITY; STORAGE PROPERTIES; NAALH4; DEHYDROGENATION; TITANIUM; MICROSTRUCTURE; PERFORMANCES; COMPOSITE; KINETICS; HYDRIDES
作者信息
通讯作者地址: Xiao, XZ; Chen, LX (通讯作者)
显示更多Zhejiang Univ, State Key Lab Silicon Mat, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China.
地址:
显示更多[ 1 ] Zhejiang Univ, State Key Lab Silicon Mat, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China
显示更多[ 2 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, 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 Key R&D Program of China
2018YFB1502104
National Natural Science Foundation of China
51571179
51671173
Open Foundation of the Guangdong Provincial Key Laboratory of Advance Energy Storage Materials
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出版商
ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
期刊信息
Impact Factor (影响因子): Journal Citation Reports
类别 / 分类
研究方向:Materials Science
Web of Science 类别:Materials Science, Multidisciplinary