Fabrication using sequence wet-chemical coating and electrochemical performance of Ni–Fe-foam-supported solid oxide electrolysis cell for hydrogen production from steam |
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| Authors: | R Visvanichkul P Puengjinda T Jiwanuruk S Peng-Ont N Sirimungkalakul W Ngampuengpis T Sornchamni P Kim-Lohsoontorn |
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| Affiliation: | 1. Centre of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;2. PTT Innovation Institute, PTT Public Company Limited, Ayutthaya, 13170, Thailand;3. Bio-Circular-Green Economy Technology & Engineering Center, BCGeTEC, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand |
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| Abstract: | Ni–Fe-alloy-foam supported solid oxide electrolysis cell with an arrangement of nickle and Sc0.1Ce0.005Gd0.005Zr0.89O2 (Ni-SCGZ) cathode, SCGZ electrolyte and Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) anode is successfully fabricated by the sequence wet-chemical coating. The multi-layer cathode with a gradient of thermal expansion coefficient (TEC) is deposited on the alloy-foam support. Two-step firing processes are applied including cathode pre-firing (1373 K, 2 h) and electrolyte sintering (1623 K, 4 h) using slow heating rate enhanced with compressive loading. The fabricated cell shows current density of ?0.95 Acm?2 at 1.1 V with H2O:H2 = 70:30 and 1073 K, providing hydrogen production rate at 4.95 × 10?6 mol s?1. However, performance degradation was observed with the rate of 0.08 V h?1, which can be ascribed to the delamination of BSCF anode under operating at high current density. |
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| Keywords: | Metal-supported solid oxide electrolysis cell Metal foam Ni–Fe alloy Foam Wet-chemical coating Steam electrolysis Hydrogen production |
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