Stack performance of phosphotungstic acid functionalized mesoporous silica (HPW-meso-silica) nanocomposite high temperature proton exchange membrane fuel cells

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Stack performance of phosphotungstic acid functionalized mesoporous silica (HPW-meso-silica) nanocomposite high temperature proton exchange membrane fuel cells

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Title: Stack performance of phosphotungstic acid functionalized mesoporous silica (HPW-meso-silica) nanocomposite high temperature proton exchange membrane fuel cells
Author/Creator: Zeng, J | Jin, Benqin | Shen, P K | He, B | Lamb, K | De Marco, R | Jiang, S P
Description: In this paper, a series of short stacks with 2-cell, 6-cell and 10-cell employing phosphotungstic acid functionalized mesoporous silica (HPW-meso-silica) nanocomposite proton exchange membranes (PEMs) have been successfully fabricated, assembled and tested from room temperature to 200 °C. The effective surface area of the membrane was 20 cm2 and fabricated by a modified hot-pressing method. With the 2-cell stack, the open circuit voltage was 1.94 V and it was 5.01 V for the 6-cell stack, indicating a low gas permeability of the HPW-meso-silica membranes. With the 10-cell stack, a maximum power density of 74.4 W (equivalent to 372.1 mW cm-2) occurs at 150 °C in H2/O2, and the stack produces a near-constant power output of 31.6 W in H2/air at 150 °C without external humidification for 50 h. The short stack also displays good performance and stability during startup and shutdown cycling testing for 8 days at 150 °C in H2/air. Although the stack test period may be too short to extract definitive conclusions, the results are very promising, demonstrating the feasibility of the new inorganic HPW-meso-silica nanocomposites as PEMs for fuel cell stacks operating at elevated temperatures in the absence of external humidification.
Relation: International Journal of Hydrogen Energy / Vol. 38, No. 29, pp.12830-12837
Relation: http://dx.doi.org/10.1016/j.ijhydene.2013.07.108
Year: 2013
Publisher: Elsevier Ltd.
Subject: FoR 0904 (Chemical Engineering) | proton exchange membrane fuel cells | phosphotungstic acid functionalized mesoporous silica | high temperature PEM | stack performance | startup and shut-down

Resource Type: Journal Article
Identifier: ISSN: 0360-3199
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