Carbon deposition behaviour in metal-infiltrated gadolinia doped ceria electrodes for simulated biogas upgrading in solid oxide electrolysis cells

JOURNAL OF POWER SOURCES

卷:293

Article

Duboviks, V.¹  Lomberg, M.¹  Maher, R. C.²  Cohen, L. F.²  Brandon, N. P.¹  Offer, G. J.³ 

[1] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2BP, England

[2] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BP, England

[3] Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2BP, England

关键词: Solid oxide fuel cells;    Electrolysis;    Raman spectroscopy;    Carbon deposition;    Metal infiltration technique;    Biogas upgrade;   

DOI  :  10.1016/j.jpowsour.2015.06.003

来源: Elsevier

【 摘 要 】

One of the attractive applications for reversible Solid Oxide Cells (SOCs) is to convert CO2 into CO via high temperature electrolysis, which is particularly important for biogas upgrading. To improve biogas utility, the CO2 component can be converted into fuel via electrolysis. A significant issue for SOC operation on biogas is carbon-induced catalyst deactivation. Nickel is widely used in SOC electrodes for reasons of cost and performance, but it has a low tolerance to carbon deposition. Two different modes of carbon formation on Ni-based electrodes are proposed in the present work based on ex-situ Raman measurements which are in agreement with previous studies. While copper is known to be resistant towards carbon formation, two significant issues have prevented its application in SOC electrodes namely its relatively low melting temperature, inhibiting high temperature sintering, and low catalytic activity for hydrogen oxidation. In this study, the electrodes were prepared through a low temperature metal infiltration technique. Since the metal infiltration technique avoids high sintering temperatures, Cu-Ce0.9Gd0.1O2-delta (Cu-CGO) electrodes were fabricated and tested as an alternative to Ni-CGO electrodes. We demonstrate that the performance of Cu-CGO electrodes is equivalent to Ni-CGO electrodes, whilst carbon formation is fully suppressed when operated on biogas mixture. (C) 2015 Elsevier B.V. All rights reserved.B.V

【 授权许可】

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