Symbiotic CeH2.73/CeO2 catalyst: A novel hydrogen pump

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	Symbiotic CeH2.73/CeO2 catalyst: A novel hydrogen pump
	Lin, HJ ; Tang, JJ ; Yu, Q ; Wang, H ; Ouyang, LZ ; Zhao, YJ ; Liu, JW ; Wang, WH ; Zhu, M
刊名	NANO ENERGY
	2014
卷号	9 页码:80
关键词	Hydrogen storage MgH2 Symbiotic CeH2.73/CeO2 Catalysis In situ HRTEM Theoretical calculations
ISSN号	2211-2855
通讯作者	Yu, Q (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
中文摘要	Using additives/catalysts to destabilize hydrides of high hydrogen storage density, e.g. MgH2 with 7.6 wt%-H and desorption temperature as high as 300-400 degrees C, is one of the most important strategies to overcome the hurdle of applying hydrogen storage materials in technologies related to hydrogen energy. Despite tremendous efforts, to develop additives/catalysts with high catalytic activity and easy doping remains a great challenge. Here, we report a simple method to induce a novel symbiotic CeH2.73/CeO2 catalyst in Mg-based hydrides, which is capable of massive fabrication. More importantly, we reveal a spontaneous hydrogen release effect at the CeH2.73/CeO2 interface, which leads to dramatic increase of catalysis than either sole CeH2.73 or CeO2 catalyst. Maximum hydrogen desorption temperature reduction of MgH2 could reach down to similar to 210 degrees C as molar ratio of CeH2.73 to CeO2 was 1:1. The dynamic boundary evolution during hydrogen desorption was observed in the symbiotic CeH2.73/CeO2 at atomic resolution using in situ High-Resolution Transmission Electron Microscope (HRTEM). Combining the ab-initio calculations, which show significant reduction of the formation energy of V-H (hydrogen vacancy) in the CeH2.73/CeO2 boundary region in comparison to those in the bulk MgH2 and CeH2.73, we demonstrate that the outstanding catalytic activity can be attributed to the spontaneous hydrogen release effect at the CeH2.73/CeO2 interface. (C) 2014 Elsevier Ltd. All rights reserved.
资助信息	Ministry of Science and Technology of China [2010CB631302]; National Natural Science Foundation of China [U1201241, 51071068, 51271078]; KLGHEI [KLB11003]; Fundamental Research Funds for the Central Universities
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59334]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Lin, HJ,Tang, JJ,Yu, Q,et al. Symbiotic CeH2.73/CeO2 catalyst: A novel hydrogen pump[J]. NANO ENERGY,2014,9:80.
APA	Lin, HJ.,Tang, JJ.,Yu, Q.,Wang, H.,Ouyang, LZ.,...&Zhu, M.(2014).Symbiotic CeH2.73/CeO2 catalyst: A novel hydrogen pump.NANO ENERGY,9,80.
MLA	Lin, HJ,et al."Symbiotic CeH2.73/CeO2 catalyst: A novel hydrogen pump".NANO ENERGY 9(2014):80.