Diffusion-layer-free air cathode based on ionic conductive hydrogel for microbial fuel cells

文献类型： 外文期刊

第一作者： Li, Yi

作者： Li, Yi;Guan, Weikai;Shi, Xiaowen;Zhang, Xinquan;Wang, Xu;Mao, Xuhui;Yang, Wulin;Liu, Xue;Zhang, Enren

作者机构：

关键词： Microbial fuel cell; Air cathode; Hydrogel; Diffusion layer

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 743 卷

页码：

收录情况： SCI

摘要： High hydraulic pressure in air-cathode microbial fuel cells (MFCs) can lead to severe cathodic water leakage and power reduction, thereby hindering the practical applications of MFCs. In this study, an alternative air cathode without a diffusion layer was developed using a cross-linked hydrogel, oxidized konjac glucomannan/2-hydroxypropytrimethyl ammonium chloride chitosan (OM), for ion bridging. The cathode was placed horizontally to avoid hydraulic pressure on its surface. Ion transportation was sustained with a minimal OKH hydrogel loading of 10 mg/cm(2). A maximum power density of 1.0 +/- 0.04 W/m(2) was achieved, which was only slightly lower than the 1.28 +/- 0.02 W/m(2) of common air cathodes. Moreover, the cost of the OKH hydrogel is only $0.12/m(2), which can reduce similar to 85% of the cathode cost without using the advanced polyvinylidene fluoride diffusion layer. Therefore, the development of this new diffusion-layer-free air cathode using conductive ionic hydrogel provides a low-cost strategy for stable MFC operation, thereby demonstrating great potential for practical applications of MFC technology. (C) 2020 Published by Elsevier B.V.

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