Catalytic Enhancement of Solid Carbon Oxidation in HDCFCs

Lisa Deleebeeck, Davide Ippolito, Kent Kammer Hansen

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Abstract

Hybrid direct carbon fuel cells (HDCFCs) consisting of a solid carbon (carbon black)-molten carbonate ((62-38 wt% Li-K)2CO3) mixtures in the anode chamber of an anode-supported solid oxide fuel cell (SOFC)-type full-cell (NiO-yttria-stablized zirconia (YSZ)|YSZ|lanthanum strontium manganite (LSM)-YSZ/LSM) are tested for their electrochemical performance between 700 and 800°C. Performance was investigated using electrochemical impedance spectroscopy (EIS) and current-potential-power density curves. EIS data is interpreted using a model circuit (R-RQ-RQ-RQ), and the dominant processes revealed by the impedance data as a function of temperature, anode and cathode atmospheres, and their flow rates are discussed. In the anode chamber, catalysts are mixed with the carbon-carbonate mixture. These catalysts include various manganese oxides (MnO2, Mn2O3, and Mn3O4, Fig. 1) and doped-ceria (CeO2, Ce1-xGdxO2, Ce1-xRExO2 (RE = Pr, Gd, Sm, etc.)), the effectiveness of these families of catalysts are discussed with respect to electrochemical, chemical and post-mortem analysis. Fig. 1. Current-potential-power density curves acquired for a blank (SiC) and manganese oxide (MnO2, Mn2O3, Mn3O4) catalysts suspended in the carbon-carbonate mixture in the anode chamber of an HDCFC. 96-4 vol% N2-CO2 (anode), air (cathode), 755°C, 0-600 mA, 50 mA/step. Power density corrected to cathode geometric surface area. [Formula]
Original languageEnglish
JournalElectrochemical Society. Meeting Abstracts (Online)
VolumeMA2014-01
Issue number16
Pages (from-to)20732-20732
ISSN2151-2043
Publication statusPublished - 2014
Event225th ECS Meeting - Orlando, FL, United States
Duration: 11 May 201415 May 2014
Conference number: 225

Conference

Conference225th ECS Meeting
Number225
CountryUnited States
CityOrlando, FL
Period11/05/201415/05/2014

Keywords

  • Carbon Fuel Cells

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