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Reduced mass transport resistance in polymer electrolyte membrane fuel cell by polyethylene glycol addition to catalyst ink
Affiliation:1. Fuel Cell Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Daejeon 34129, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;3. Major of Advanced Energy and Technology, University of Science and Technology, 217 Gajeong-ro, Yusong-gu, Daejeon 34112, Republic of Korea;1. Department of Chemical Engineering, Middle East Technical University, 06800 Ankara, Turkey;2. Department of Chemical Engineering, Ondokuz Mayis University, 55139 Samsun, Turkey;3. Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey;1. Department of Chemical Engineering, Middle East Technical University, 06800, Ankara, Turkey;2. Department of Chemical Engineering, Ondokuz Mayıs University, 55139, Samsun, Turkey;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Hubei Provincial Key Laboratory of Fuel Cells, Wuhan University of Technology, Wuhan, China, 430070;2. Wuhan WUT New Energy Co., Ltd., Wuhan, China, 430223;3. School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan, China, 430073;1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. Energy Conversion R&D Center, Central Academy of Dongfang Electric Corporation, Chengdu 611731, China;3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;4. Beijing Sino Hydrogen Technology Co., Ltd., Beijing 100084, China;1. 20/20 Laboratory for Fuel Cell and Green Energy RD&D, Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;2. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
Abstract:Effects of Polyethylene glycol (PEG) addition to cathode catalyst ink were investigated by changing the addition amount of PEG. Performance of the polymer electrolyte membrane fuel cells (PEMFCs) increased and then decreased at the higher current density than 1.5 A/cm2 as the amount of PEG addition increased. However, durability was not changed by the addition of PEG to the catalyst ink. Three different molecular weights of PEG were compared for PEG additives to cathode catalyst ink. Performance at high current density region increased and then decreased as PEG molecular weight increases from 200 to 10000. Increased performance by addition of PEG was attributed from reduced mass transport resistance. However, addition of large molecular weight PEG to catalyst ink reduced the performance because it lowered ionomer conductivity in the catalyst layer and then reduced proton transport resistance. Increased pore size in the catalyst layer and increased hydrophilicity on the electrode were also analyzed by addition of PEG to catalyst ink.
Keywords:Polymer electrolyte membrane fuel cell  Polyethylene glycol (PEG)  Catalyst layer  Pore size distribution  Mass transport resistance
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