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 Investigation of in-situ catalytic combustion in polymer-electrolyte-membrane fuel cell during combined chemical and mechanical stress test
Tác giả hoặc Nhóm tác giả: Phi Manh Ngo, Hironori Nakajima, Takahiro Karimata, Tomoko Saitou, Kohei Ito
Nơi đăng: Journal of Power sources; Số: 542;Từ->đến trang: 231803;Năm: 2022
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
This study is focused on elucidating the catalytic combustion phenomenon in proton-exchange-membrane fuelcells. A visualization cell and an infrared (IR) camera are used to capture the thermal behavior under combinedchemical and mechanical accelerated stress conditions in situ. Catalyst coated membrane (CCM) embedded in thecell is subjected to a relative humidity (RH) cycling test under open-circuit voltage (OCV) conditions at atmosphericpressure and at a cell temperature of 80 ◦C. The temperature distribution on the gas diffusion layersurface at the cathode is captured through a high-transmittance glass window (ZnS window). Continuous IRimaging revealed a hot spot at ca. 500 RH cycles, suggesting the existence of a pinhole in the degraded CCM andthe occurrence of catalytic combustion there. The occurrence of the hot spot coincides with the time at which theelectrochemical indicators detect membrane failure, i.e., hydrogen crossover rate, OCV. Furthermore, a postmortem analysis revealed a 105-μm diameter pinhole, the position of which matched that of the hot spot. Thispinhole is responsible for the rapid increase in the hydrogen crossover rate as well as the significant decrease inthe OCV at 500 RH cycles until the end of the durability test.
ABSTRACT
This study is focused on elucidating the catalytic combustion phenomenon in proton-exchange-membrane fuelcells. A visualization cell and an infrared (IR) camera are used to capture the thermal behavior under combinedchemical and mechanical accelerated stress conditions in situ. Catalyst coated membrane (CCM) embedded in thecell is subjected to a relative humidity (RH) cycling test under open-circuit voltage (OCV) conditions at atmosphericpressure and at a cell temperature of 80 ◦C. The temperature distribution on the gas diffusion layersurface at the cathode is captured through a high-transmittance glass window (ZnS window). Continuous IRimaging revealed a hot spot at ca. 500 RH cycles, suggesting the existence of a pinhole in the degraded CCM andthe occurrence of catalytic combustion there. The occurrence of the hot spot coincides with the time at which theelectrochemical indicators detect membrane failure, i.e., hydrogen crossover rate, OCV. Furthermore, a postmortem analysis revealed a 105-μm diameter pinhole, the position of which matched that of the hot spot. Thispinhole is responsible for the rapid increase in the hydrogen crossover rate as well as the significant decrease inthe OCV at 500 RH cycles until the end of the durability test.
[ investigation of in-situ catalytic combustion in polymer-electrolyte-membrane fuel cell during combined chemical and mechanical stress test.pdf ]
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