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Gadolinium doped ceria-impregnated nickel-yttria stabilised zirconia cathode for solid oxide electrolysis cell |
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| Authors: | Pattaraporn Kim-Lohsoontorn Yu-Mi KimNavadol Laosiripojana Joongmyeon Bae |
| Affiliation: | a Department of Chemical Engineering, Mahidol University, Nakorn Pathom 73170, Thailand b KI for Eco-Energy, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305 701, Republic of Korea c Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305 701, Republic of Korea d The Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand |
| Abstract: | Steam electrolysis (H2O → H2 + 0.5O2) was investigated in solid oxide electrolysis cells (SOECs). The electrochemical performance of GDC-impregnated Ni-YSZ and 0.5% wt Rh-GDC-impregnated Ni-YSZ was compared to a composite Ni-YSZ and Ni-GDC electrode using a three-electrode set-up. The electrocatalytic activity in electrolysis mode of the Ni-YSZ electrode was enhanced by GDC impregnation. The Rh-GDC-impregnated Ni-YSZ exhibited significantly improved performance, and the electrode exhibited comparable performance between the SOEC and SOFC modes, close to the performance of the composite Ni-GDC electrode. The performance and durability of a single cell GDC-impregnated Ni-YSZ/YSZ/LSM-YSZ with an H2 electrode support were investigated. The cell performance increased with increasing temperature (700 °C-800 °C) and exhibited comparable performance with variation of the steam-to-hydrogen ratio (50/50 to 90/10). The durability in the electrolysis mode of the Ni-YSZ/YSZ/LSM-YSZ cell was also significantly improved by the GDC impregnation (200 h, 0.1 A/cm2, 800 °C, H2O/H2 = 70/30). |
| Keywords: | Solid oxide electrolysis cell Hydrogen production Steam electrolysis Ceria Impregnation |
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