Yoon, Kyung Joong Lee, Sung-il An, Hyegsoon Kim, Jeonghee Son, Ji-Won Lee, Jong-Ho Je, Hae-June Lee, Hae-Weon Kim, Byung-Kook 2024-01-20T10:04:16Z 2024-01-20T10:04:16Z 2021-09-05 2014-03-06 0360-3199 https://pubs.kist.re.kr/handle/201004/127005 To further develop solid oxide regenerative fuel cell (SORFC) technology, the effect of gas diffusion in the hydrogen electrode on the performance of solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is investigated. The hydrogen electrode-supported cells are fabricated and tested under various operating conditions in both the power generation and hydrogen production modes. A transport model based on the dusty-gas model is developed to analyze the multi-component diffusion process in the porous media, and the transport parameters are obtained by applying the experimentally measured limiting current data to the model. The structural parameters of the porous electrode, such as porosity and tortuosity, are derived using the Chapman-Enskogg model and microstructural image analysis. The performance of an SOEC is strongly influenced by the gas diffusion limitation at the hydrogen electrode, and the limiting current density of an SOEC is substantially lower than that of an SOFC for the standard cell structure under normal operating conditions. The pore structure of the hydrogen electrode is optimized by using poly(methyl methacrylate) (PMMA), a pore-forming agent, and consequently, the hydrogen production rate of the SOEC is improved by a factor of greater than two under moderate humidity conditions. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD HIGH-TEMPERATURE ELECTROLYSIS YTTRIA-STABILIZED ZIRCONIA MASS-TRANSFER MODELS INTERMEDIATE-TEMPERATURE OXYGEN-ELECTRODE DUSTY-GAS ELECTROCHEMICAL CHARACTERIZATION MICROSTRUCTURE DEGRADATION PERFORMANCE ANODE Gas transport in hydrogen electrode of solid oxide regenerative fuel cells for power generation and hydrogen production Article 10.1016/j.ijhydene.2013.12.142 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.39, no.8, pp.3868 - 3878 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 39 8 3868 3878 scie scopus 000332999800030 2-s2.0-84894086975 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article HIGH-TEMPERATURE ELECTROLYSIS YTTRIA-STABILIZED ZIRCONIA MASS-TRANSFER MODELS INTERMEDIATE-TEMPERATURE OXYGEN-ELECTRODE DUSTY-GAS ELECTROCHEMICAL CHARACTERIZATION MICROSTRUCTURE DEGRADATION PERFORMANCE ANODE Solid oxide regenerative fuel cell Solid oxide fuel cell Solid oxide electrolysis cell Gas diffusion Concentration polarization