Improved vanadium barrier properties of perfluorinated sulfonic acid membranes for vanadium redox flow battery

International Conference on Process Engineering and Advanced Materials 2018

Sha'Rani, S.S.^1,2 ; Abouzari-Lotf, E.^2,3 ; Nasef, M.M.^2,4 ; Ahmad, A.^2,3 ; Ting, T.M.^5 ; Ali, R.R.^1

Malaysia-Japan International Institute of Technology, International Campus, Universiti Teknologi Malaysia, Jalan Semarak, Kuala Lumpur

54100, Malaysia^1

Advanced Materials Research Group, Center of Hydrogen Energy, Universiti Teknologi Malaysia, Jalan Semarak, Kuala Lumpur

54100, Malaysia^2

Department of Chemical Engineering, Univeristi Teknologi Malaysia, Johor Bahru

81310, Malaysia^3

Chemical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar, Perak

32610, Malaysia^4

Nuclear Agency (Nuclear Malaysia) Bangi, Selangor, Kajang

43000, Malaysia^5

关键词: Battery performance;    Coulombic efficiency;    Perfluorinated sulfonic acid membranes;    Poly(diallyldimethylammonium chloride);    Polyelectrolyte layers;    Sodium styrene sulfonates;    Vanadium permeabilities;    Vanadium redox flow batteries;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/458/1/012079/pdf
DOI  :  10.1088/1757-899X/458/1/012079

来源: IOP

【 摘 要 】

The search for highly vanadium selective membrane for vanadium redox flow battery (VRFB) is fast growing to accelerate the commercialization of VRFB. Currently, VRFB is challenged by high vanadium permeability through the membranes lowering the battery performance. In this paper, a simple and effective strategy for improving the vanadium barrier permeability of the membranes, without altering the desired proton conductivity, was reported by applying layer(s) of polyelectrolytes. A commercial perfluorinated sulfonic acid membrane, GN115 was modified by layer of positively charged poly(diallyldimethylammonium chloride) (PDDA) or consecutive layers of PDDA and negatively charged poly(sodium styrene sulfonate) (PSS). Upon surface modification, the membranes exhibited a reduced vanadium permeability with a slight decreased in proton conductivity values compared with the pristine GN115 and N117. As a result, higher coulombic efficiency was obtained in VRFB single cell with the modified membranes. This confirms that the addition of the polyelectrolyte layers can suppress the vanadium permeability of the membranes.