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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 28, 2001
Accepted August 21, 2001

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effects of Interface Hydrophilicity and Metallic Compounds on Water-Splitting Efficiency in Bipolar Membranes

Moon-Sung Kang Akihiko Tanioka¹ Seung-Hyeon Moon^†

Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju 500-712, Korea ¹Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama,Meguro-ku, Tokyo 152, Japan

shmoon@kjist.ac.kr

Korean Journal of Chemical Engineering, January 2002, 19(1), 99-106(8), 10.1007/BF02706881

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Abstract

Bipolar membranes (BPMs) were prepared by using commercial ion exchange membranes and hydrophilic polymer as a binder to investigate the effects of the interface hydrophilicity on water-splitting capacity. In this study, polyHEMA/MPD cross-linked with TMC was used as a binding material to enhance the BPM interface hydrophilicity. The enhanced hydrophilicity of the BPM interface accelerated the water-splitting reaction because the hydrophilic polymer layer increases the water activity by attracting water from the ion exchange layers to the space charge region. In addition, a mechanism of the metal catalytic reaction was proposed. Metal species were immobilized in the BPM in a hydroxide form and possibly react with water molecules and the quaternary ammonium groups reversibly. It was also observed that metal species immobilized in the membrane improved the water-splitting efficiency by increment of the membrane wetness and enhancement of the membrane conductivity, with an apparent optimum_x000D_ metal concentration for the water-splitting reaction.

Keywords

Bipolar Membrane Hydrophilicity PolyHEMA/MPD Immobilization of Metallic Compound Metal Catalytic Reaction

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