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Studies of current collection configurations and sealing for tubular hybrid-DCFC

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Abstract

Direct Carbon Fuel Cells (DCFC) offer efficient conversion of coal or biomass derived carbons to electricity. A Hybrid Direct Carbon Fuel Cell (HDCFC) is a type of DCFCs that combines solid oxide cell geometry with a molten carbonate fuel cell electrode. This study focused on investigating different current collection configurations and sealant for tubular HDCFC concept. A HDCFC used a gadolinia doped ceria (GDC) or a YSZ as the electrolyte, in composites with NiO and LSM as the anode and the cathode, respectively. Three different current collection configurations of HDCFC were investigated by AC impedance in order to study the electrochemical phenomena that occur at the electrodes surface. The AC impedance results showed that both the surface area and the position of the current collector inside of the anode chamber affect drastically both the series resistance (Rs) and the polarisation resistance (Rp) values. The lowest total resistance (Rtot) was achieved on Configuration b with silver wire interwoven nickel mesh attached to the side of the anode wall by silver paste (Rtot = 2.98 Ω) and while the highest Rtot was achieved on the configuration c with silver wire interwoven nickel mesh inserted into the mixture of carbon and carbonate (Rtot = 149 Ω). The leak test carried out on several sealants demonstrated that composite sealants of Toku P-24 paste and an alumina silicate disc produced a low degree of leaks due to both the high resistance to the carbonate mixture and high density sealing after curing compared to the ceramabond.
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Original languageEnglish
Pages (from-to)18788-18796
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number41
Early online date23 Feb 2016
DOIs
Publication statusPublished - 2 Nov 2016
Event3rd International Workshop on Molten Carbonates and Related Topics (IWMC) - Shenyang
Duration: 11 Jun 201513 Jun 2015

    Research areas

  • Fuel cell, DCFC, Sealant, CGO, LSM, Current collector

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