標題: Palladium based cermet composite for hydrogen separation at elevated temperature
作者: Tsai, Yen-Chang
Lin, Chien-Cheng
Lin, Wei-Lin
Wang, Jeng-Han
Chen, San-Yuan
Lin, Pang
Wu, Pu-Wei
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Palladium;Perovskite;Cermet;Hydrogen separation;Proton-conducting ceramic
公開日期: 15-一月-2015
摘要: A cermet composite consisting of palladium and BaCe0.4Zr0.4Gd0.1DY0.1O3-x (BCZGD) is fabricated by mixing palladium and BCZGD powders in a ball mill, followed by pressing and sintering at 1450 degrees C for 24 h in air. The Pd-BCZGD cermet demonstrates impressive hydrogen permeation flux in a mixture of hydrogen and carbon dioxide at elevated temperature, in which the palladium plays the predominant role of facile transport in the hydrogen atoms whereas the BCZGD provides channels for proton conduction. Material characterization including scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermo-gravimetric analysis (TGA) are performed. XRD patterns indicate pure phases of fcc palladium and perovskite BCZGD. SEM images and element mapping suggest a homogeneous mixture of cermet without noticeable defect and phase segregation. TGA results confirm stability of the cermet against carbon dioxide without chemical decomposition. The hydrogen permeation flux is determined via a gas chromatography from 400 to 700 degrees C at various hydrogen concentration gradients. We record a hydrogen flux of 1.25 cm(3) min(-1) cm(-2) in 50% hydrogen and 50% carbon dioxide at 700 degrees C, with a selectivity of H-2/CO2 approaching infinity. (C) 2014 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jpowsour.2014.10.085
http://hdl.handle.net/11536/124208
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2014.10.085
期刊: JOURNAL OF POWER SOURCES
Volume: 274
起始頁: 965
結束頁: 970
顯示於類別:期刊論文