Effects of assembly torque on a proton exchange membrane fuel cell with stamped metallic bipolar plates

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Title:	Effects of assembly torque on a proton exchange membrane fuel cell with stamped metallic bipolar plates
Authors:	Chen, CY (Chen, Chen-Yu) Su, SC (Su, Sheng-Chun)
Contributors:	機械工程系暨機械工程學系數位機電研究所
Keywords:	STAINLESS-STEEL 304 CONTACT RESISTANCE CORROSION-RESISTANCE SURFACE MODIFICATION FORMING PROCESS MICRO-CHANNELS PERFORMANCE FABRICATION ENERGY PEMFC STACK
Date:	2018-09-15
Issue Date:	2019-01-16 15:16:08 (UTC+8)
Abstract:	In this work, a proton exchange membrane fuel cell with stamped 304 stainless steel bipolar plates is successfully assembled, The total weight of the bipolar plates, membrane electrode assembly and gaskets in the fuel cell is reduced by 37% when replacing milled graphite plates by the stamped 304 stainless steel plates. Moreover, the gas leaking rates and electrochemical characteristics of the fuel cell at different assembly torques are studied. It is found that increasing the torque increases the sealing performance. However, an excess torque (>6 N-m) decreases the power due to a decrease in the porosity and hydrophobicity of the gas diffusion layer, and a deformation of the flow channels in the metallic plate. The pressure loss rate declines by 56% as the torque increases from 2 N-m to 7 N-m. The best performance is obtained at 6 N-m. The cell performance increases by about 21% as the torque increases from 2 N-m to 6 N-m. However, the performance decreases by about 11% as the torque further increases from 6 N-m to 7 N-m. The suspected reason for the above phenomenon is verified via the electrochemical impedance spectroscopies and the microscopic images of the gas diffusion layer. (C) 2018 Elsevier Ltd. All rights reserved.
Appears in Collections:	[Department of Mechanical Engineering ] journal articles

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