Incorporation of a Pd catalyst at the fuel electrode of a thin-film-based solid oxide cell by multi-layer deposition and its impact on low-temperature co-electrolysis

Authors
Thieu, Cam-AnhHong, JongsupKim, HyoungchulYoon, Kyung JoongLee, Jong-HoKim, Byung-KookSon, Ji-Won
Issue Date
2017-04-28
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.16, pp.7433 - 7444
Abstract
To enhance the electrochemical performance and syngas production in low-temperature co-electrolysis (LT-Co-EC), incorporation of Pd into the nickel-yttria-stabilized zirconia (Ni-YSZ) fuel electrode functional layer (FEFL) of a thin film-based solid oxide cell (TF-SOC) by multi-layer thin film deposition was investigated. The optimal configuration to insert a Pd layer without disturbing the surface and cross-sectional microstructure of the FEFL was fabricated by alternating multi-layer deposition of Pd by sputtering and nickel oxide-yttria-stabilized zirconia (NiO-YSZ) by pulsed laser deposition (PLD). TF-SOCs with Pd (Pd-cell) and without Pd (Ref-cell) were fabricated and compared based on the electrochemical reaction and syngas production in LT-Co-EC. The results showed that the catalytic activity by forming the Pd-Ni alloy on the electrochemical performance and thermochemical reaction are improved by Pd incorporation at low temperatures (<= 600 degrees C). Detailed microstructural analyses showed that Pd distributes from the electrode/electrolyte interface to a depth of several tens of microns in the anode support and forms a nano-structured Ni-Pd alloy, which contributes to improving the electrochemical reaction and thermochemical reactions such as water-gas-shift (WGS). It was also found that the performance stability was superior in the Pd-cell because pore array generation at the electrolyte/electrode interface was significantly suppressed in comparison with that of the Ref-cell.
Keywords
RENEWABLE ENERGY-SOURCES; NI BIMETALLIC CATALYSTS; SYNGAS PRODUCTION; STEAM/CO2 MIXTURES; CARBON-DIOXIDE; YSZ COMPOSITE; SOFC ANODES; PERFORMANCE; METHANE; MICROSTRUCTURE; RENEWABLE ENERGY-SOURCES; NI BIMETALLIC CATALYSTS; SYNGAS PRODUCTION; STEAM/CO2 MIXTURES; CARBON-DIOXIDE; YSZ COMPOSITE; SOFC ANODES; PERFORMANCE; METHANE; MICROSTRUCTURE; LT-Co-EC; Pd catalyst; TF-SOFC; fuel electrode
ISSN
2050-7488
URI
https://pubs.kist.re.kr/handle/201004/122832
DOI
10.1039/c7ta00499k
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KIST Article > 2017
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