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

标题

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

作者

作者:Lin, HJ (Lin, Huai-Jun)^[1 ]; Tang, JJ (Tang, Jia-Jun)^[3,1 ]; Yu, Q (Yu, Qian)^[2,5 ]; Wang, H (Wang, Hui)^[1 ]; Ouyang, LZ (Ouyang, Liu-Zhang)^[1 ]; Zhao, YJ (Zhao, Yu-Jun)^[3 ]; Liu, JW (Liu, Jiang-Wen)^[1 ]; Wang, WH (Wang, Wei-Hua)^[4 ]; Zhu, M (Zhu, Min)^[1 ]

期刊信息

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.

关键词

作者关键词:Hydrogen storage; MgH2; Symbiotic CeH2.73/CeO2; Catalysis; In situ HRTEM; Theoretical calculations

作者信息

作者信息

通讯作者地址:Yu, Q (通讯作者)

Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.   增强组织信息的名称     University of California System     United States Department of Energy (DOE)     University of California Berkeley     Lawrence Berkeley National Laboratory

地址:

	[ 1 ] S China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510640, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA   增强组织信息的名称     United States Department of Energy (DOE)     University of California System     Lawrence Berkeley National Laboratory     University of California Berkeley
	[ 3 ] S China Univ Technol, Dept Phys, Guangzhou 510640, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 4 ] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China   增强组织信息的名称     Chinese Academy of Sciences     Institute of Physics, CAS
	[ 5 ] Zhejiang Univ, Ctr Electron Microscopy, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China   增强组织信息的名称     Zhejiang University

电子邮件地址:gyu@lbl.gov; whw@iphy.ac.cn; memzhu@scut.edu.cn

出版商

ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

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