Tsai, C. W.C. W.TsaiHAO MING CHENRU-SHI LIULee, J. F.J. F.LeeChang, S. M.S. M.ChangWeng, B. J.B. J.Weng2018-09-102018-09-102012http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000301615100039&KeyUID=WOS:000301615100039http://scholars.lib.ntu.edu.tw/handle/123456789/369523Co-based catalysts of the reaction by which hydrogen was obtained from NaBH4 solution were prepared by chemical reduction in a liquid phase. X-ray diffraction and scanning electron microscopy analyses showed that the as-prepared Fe@Co catalyst was ultrafine and amorphous. The calculated Arrhenius activation energy of the Fe@Co catalyst was 35.62(1) kJ mol-1 while that of the Co catalyst was 38.81(2) kJ mol-1, demonstrating that Fe@Co nanoparticles reduce the activation energy of the reaction more than does a Co nanocatalyst. X-ray absorption spectroscopy (XAS) clearly reveals the valences of Fe and Co. The Fe valence of Fe@Co is smallest among three catalysts because of the Co shell. The molar ration of Fe to Co is 1: 2 as determined by using XPS analysis, indicating that the novel catalyst reduces costs. The generation of hydrogen is schematically elucidated. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.Core-shell catalyst; Hydrogen generation; Magnetic recycle; Sodium borohydride; X-ray absorption spectroscopy[SDGs]SDG7Arrhenius activation energy; Chemical reduction; Co catalysts; Co Nanoparticles; Co-based catalysts; Core-shell; Fe valence; Hydrogen generation; Liquid Phase; Magnetic recycle; Nano-catalyst; Novel catalysts; Scanning electrons; Sodium borohydride; Sodium borohydrides; Ultrafine; XPS analysis; Activation energy; Hydrogen; Hydrogen production; Nanomagnetics; Scanning electron microscopy; Semiconducting bismuth compounds; Sodium; X ray absorption spectroscopy; X ray diffraction; Catalystsjournal article10.1016/j.ijhydene.2011.11.0382-s2.0-84856572683WOS:000301615100039