Lee, Byung-Seok Park, Hee-Young Choi, Insoo Cho, Min Kyung Kim, Hyoung-Juhn Yoo, Sung Jong Henkensmeier, Dirk Kim, Jin Young Nam, Suk Woo Park, Sehkyu Lee, Kwan-Young Jang, Jong Hyun 2024-01-20T04:34:37Z 2024-01-20T04:34:37Z 2021-09-05 2016-03 0378-7753 https://pubs.kist.re.kr/handle/201004/124328 The effect of temperature and pressure, and diffusion layer thickness is assessed on performance of a proton exchange membrane water electrolyzers (PEMWEs) with an ultralow iridium oxide (IrO2) loading (0.1 mg cm(-2)) anode prepared by electrodeposition and a Pt/C catalyzed cathode with a Pt loading of 0.4 mg cm(-2). Increasing pressure to 2.5 bar at 120 degrees C enhances the water electrolysis current, so the anode electrodeposited with 0.1 mg cm(-2) IrO2 gives a current density of 1.79 A cm(-2) at 1.6 V, which is comparable to the conventional powder-type IrO2 electrode with 2.0 mg cm(-2) at a temperature of 120 degrees C and pressure of 2.5 bar. The major factors for cell performances are rationalized in terms of over potentials, water flow rates and thickness of diffusion layers, based on polarization behavior and ac-impedance response. (C) 2016 Elsevier B.V. All rights reserved. English Elsevier BV Polarization characteristics of a low catalyst loading PEM water electrolyzer operating at elevated temperature Article 10.1016/j.jpowsour.2015.12.139 1 Journal of Power Sources, v.309, pp.127 - 134 Journal of Power Sources 309 127 134 N scie scopus 000371549100016 2-s2.0-84956648253 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article IMPEDANCE HYDROGEN-PRODUCTION FUEL-CELLS COMPOSITE MEMBRANE STEAM ELECTROLYSIS EVOLUTION REACTION ANODE CATALYST STORAGE ELECTROCATALYSTS ELECTRODES Polymer electrolyte membrane water electrolyzer High temperature Pressure Iridium oxide Electrodeposition Oxygen evolution reaction