Synthesis process and catalytic activity of Nb 2 O 5 hollow spheres for reversible hydrogen storage of MgH 2

International Journal of Energy ResearchVolume 45, Issue 2 p. 3129-3141 RESEARCH ARTICLE Synthesis process and catalytic activity of Nb2O5 hollow spheres for reversible hydrogen storage of MgH2 Xuelian Zhang, Xuelian Zhang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorKe Wang, Ke Wang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorXin Zhang, Xin Zhang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorJianjiang Hu, Jianjiang Hu School of Chemistry and Chemical Engineering, Yantai University, Yantai, ChinaSearch for more papers by this authorMingxia Gao, Mingxia Gao State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorHongge Pan, Hongge Pan State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorYongfeng Liu, Corresponding Author Yongfeng Liu mselyf@zju.edu.cn orcid.org/0000-0002-4002-8265 State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, China Correspondence Yongfeng Liu, State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Email: mselyf@zju.edu.cnSearch for more papers by this author Xuelian Zhang, Xuelian Zhang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorKe Wang, Ke Wang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorXin Zhang, Xin Zhang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorJianjiang Hu, Jianjiang Hu School of Chemistry and Chemical Engineering, Yantai University, Yantai, ChinaSearch for more papers by this authorMingxia Gao, Mingxia Gao State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorHongge Pan, Hongge Pan State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorYongfeng Liu, Corresponding Author Yongfeng Liu mselyf@zju.edu.cn orcid.org/0000-0002-4002-8265 State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, China Correspondence Yongfeng Liu, State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Email: mselyf@zju.edu.cnSearch for more papers by this author First published: 28 September 2020 https://doi.org/10.1002/er.6006Citations: 18 Xuelian Zhang and Ke Wang contributed equally to this study. Funding information: National Key R&D Program of China, Grant/Award Number: 2018YFB1502102; National Natural Science Foundation of China, Grant/Award Numbers: 51671172, U1601212; National Youth Top-Notch Talent Support Program Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Summary High operation temperatures and slow reaction kinetics are major obstacles to use MgH2 as a solid hydrogen store. We report here the synthesis of Nb2O5 hollow spheres (o-Nb2O5) with wall thickness of approximately 50 nm and mossy surfaces using a facile hydrothermal and calcination process, which showed high activity in catalysis of MgH2 for hydrogen storage. The dehydrogenation onset temperature of MgH2 was decreased to 195°C with 7 wt% of o-Nb2O5. More than 5.5 wt% H2 can be desorbed at 300°C within 5 minutes. Hydrogen re-absorption starts even at 25°C and reaches 5.6 wt% within 5 minutes at 200°C. Practical hydrogen capacity stabilizes at 5.8 wt% after 10 cycles of hydrogen uptake/release. The o-Nb2O5 was found to be reduced in situ by MgH2 to low-valence Nb species during the initial dehydrogenation process, which functions as an active catalyst and leads to the enhanced dehydrogenation kinetics. Citing Literature Supporting Information Filename Description er6006-sup-0001-supinfo.docxWord 2007 document , 544.8 KB FIGURE S1. SEM image of the hydrothermal product Figure S2. Thermal conductivity of MgH2 with and without o-Nb2O5 as a function of temperature Figure S3. JMA plot of dehydrogenation of MgH2 + 7 wt% o-Nb2O5@C sample at 300°C Figure S4. TPD curves of MgH2 with and without o-Nb2O5 at different heating rates Table S1. Comparison on isothermal hydrogen sorption properties of catalyst-modified MgH2 systems Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume45, Issue2February 2021Pages 3129-3141 RelatedInformation