TY - JOUR
T1 - A simple approach to uniform PdAg alloy membranes: Comparative study of conventional and silver concentration-controlled co-plating
AU - Zeng, Gaofeng
AU - Shi, Lei
AU - Liu, Yunyang
AU - Zhang, Yanfeng
AU - Sun, Yuhan
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors acknowledge financial support partially from National 863 Project (No: 2012AA050104) and Advanced Coal Processing Project of Chinese Academic Sciences (No: XDA0704 0401). The authors thank Prof. Lai Z. for fruitful discussions.
PY - 2014/3
Y1 - 2014/3
N2 - An Ag-controlled co-plating method was developed for the preparation of palladium/silver alloy membranes on porous tubular alumina supports. By controlling the feed rate of Ag to the Pd bath, the concentration of the silver in the plating bath was restricted during the course of plating. As a result, preferential deposition of silver at the beginning was suppressed and uniform dispersion of silver inside the membrane with silver composition in the desired range was achieved. Ultrathin (∼2.5 μm) PdAg alloy membranes with uniform silver composition of ∼25% were successfully obtained. The membrane showed a hydrogen permeance of 0.88 mol m-2 s-1 and pure-gas H2/N2 selectivity of 2140 at 823 K with ΔP = 100 kPa. Only one hydride phase existed in the studied temperature range from 373 to 823 K with ΔPH=100kPa. Direct comparisons with the conventional simply-mixed co-plating method showed that membranes made by the novel Ag-controlled co-plating method had much more uniform silver distribution, smoother surface, denser membrane structure, higher utilization rate of metal sources, and shorter alloying time. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
AB - An Ag-controlled co-plating method was developed for the preparation of palladium/silver alloy membranes on porous tubular alumina supports. By controlling the feed rate of Ag to the Pd bath, the concentration of the silver in the plating bath was restricted during the course of plating. As a result, preferential deposition of silver at the beginning was suppressed and uniform dispersion of silver inside the membrane with silver composition in the desired range was achieved. Ultrathin (∼2.5 μm) PdAg alloy membranes with uniform silver composition of ∼25% were successfully obtained. The membrane showed a hydrogen permeance of 0.88 mol m-2 s-1 and pure-gas H2/N2 selectivity of 2140 at 823 K with ΔP = 100 kPa. Only one hydride phase existed in the studied temperature range from 373 to 823 K with ΔPH=100kPa. Direct comparisons with the conventional simply-mixed co-plating method showed that membranes made by the novel Ag-controlled co-plating method had much more uniform silver distribution, smoother surface, denser membrane structure, higher utilization rate of metal sources, and shorter alloying time. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
UR - http://hdl.handle.net/10754/575706
UR - https://linkinghub.elsevier.com/retrieve/pii/S0360319914000718
UR - http://www.scopus.com/inward/record.url?scp=84895441341&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2014.01.022
DO - 10.1016/j.ijhydene.2014.01.022
M3 - Article
SN - 0360-3199
VL - 39
SP - 4427
EP - 4436
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 9
ER -
