Membrane Science and Technology

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Study on transport behaviors of vanadium ions and water across nano- porous proton-conductive membranes

Authors： SONG Shiqiang, CHEN Xiao, GUO Weinan, FAN Yongsheng, WANG Baoguo

Units： Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

KeyWords： all-vanadium redox flow battery； nano-porous proton-conductive membranes；vanadium ions penetration；water transport

ClassificationCode：TQ152

year,volume(issue):pagination： 2014, 34(1):9-14

Abstract：

Transport behaviors of different valence state hydrated vanadium ions, hydronium ion and water across nano-porous proton-conductive membranes were studied during charge/discharge cycles in all-vanadium redox flow battery，thus results contribute a basis for membranes materials optimization and battery electrolyte system management. By testing the processes of static self-discharge and constant current charge/discharge cycles, the factors influencing vanadium ions penetration and water transport through membranes were analyzed in details. The results revealed the transport discipline of vanadium ions and water penetrating through nano-porous proton-conductive membranes in vanadium redox flow battery. During self-discharge process, the mass transport and diffusion is mainly caused by vanadium ions concentration difference, while the net water migration across membrane can be ignored. In constant current charge/discharge cycles, the hydrated ions migration, concentration difference diffusion and osmotic pressure bring influence upon both negative and positive electrolytes crossover membranes simultaneously, which leads to the net water transport from positive electrolyte to negative electrolyte. Electrolyte management needs taking to keep VRB charge/discharge normal performance

Funds：

国家自然科学基金资助项目（21076112；21276134）；国家“863”（2012AA051203）和“973“计划（2010CB227202）

AuthorIntro：

宋士强（1988-），男，山东聊城人，硕士生，从事全钒液流电池过程与膜材料研究. *通讯作者，E-mail： bgwang@tsinghua.edu.cn

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