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Introducing catalyst in alkaline membrane for improved performance direct borohydride fuel cells

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Qin, Haiying, Lin, Longxia, Chu, Wen, Jiang, Wei, He, Yan, Shi, Qiao, Deng, Yonghong, Ji, Zhenguo, Liu, Jiabin and Tao, Shanwen (2018) Introducing catalyst in alkaline membrane for improved performance direct borohydride fuel cells. Journal of Power Sources, 374 . pp. 113-120. doi:10.1016/j.jpowsour.2017.11.008 ISSN 0378-7753.

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Official URL: https://doi.org/10.1016/j.jpowsour.2017.11.008

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Abstract

A catalytic material is introduced into the polymer matrix to prepare a novel polymeric alkaline electrolyte membrane (AEM) which simultaneously increases ionic conductivity, reduces the fuel cross-over. In this work, the hydroxide anion exchange membrane is mainly composed of poly(vinylalcohol) and alkaline exchange resin. CoCl2 is added into the poly(vinylalcohol) and alkaline exchange resin gel before casting the membrane to introduce catalytic materials. CoCl2 is converted into CoOOH after the reaction with KOH solution. The crystallinity of the polymer matrix decreases and the ionic conductivity of the composite membrane is notably improved by the introduction of Co-species. A direct borohydride fuel cell using the composite membrane exhibits an open circuit voltage of 1.11 V at 30 °C, which is notably higher than that of cells using other AEMs. The cell using the composite membrane achieves a maximum power density of 283 mW cm−2 at 60 °C while the cell using the membrane without Co-species only reaches 117 mW cm−2 at the same conditions. The outstanding performance of the cell using the composite membrane benefits from impregnation of the catalytic Co-species in the membrane, which not only increases the ionic conductivity but also reduces electrode polarization thus improves the fuel cell performance. This work provides a new approach to develop high-performance fuel cells through adding catalysts in the electrolyte membrane.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Fuel cells, Impedance spectroscopy, Electrolytes -- Conductivity
Journal or Publication Title: Journal of Power Sources
Publisher: Elsevier S.A.
ISSN: 0378-7753
Official Date: 15 January 2018
Dates:
DateEvent
15 January 2018Published
14 November 2017Available
2 November 2017Accepted
Volume: 374
Page Range: pp. 113-120
DOI: 10.1016/j.jpowsour.2017.11.008
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 13 November 2017
Date of first compliant Open Access: 14 March 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
LR14B060002 Natural Science Foundation of Zhejiang Provincehttp://dx.doi.org/10.13039/501100004731
LY18B060005Natural Science Foundation of Zhejiang Provincehttp://dx.doi.org/10.13039/501100004731
No.11605280National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
EP/G030995/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
17ZR1436800Natural Science Foundation of Shanghaihttp://dx.doi.org/10.13039/100007219

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