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Hybrid direct carbon fuel cell anode processes investigated using a 3-electrode half-cell setup

AuthorsDeleebeeck, L.; Arenillas de la Puente, Ana ; Menéndez Díaz, José Ángel ; Hansen, K. Kammer
KeywordsDirect carbon fuel cell (DCFC)
Cyclic voltammetry (CV)
Bituminous coal
Carbon monoxide
Carbon dioxide
Issue Date26-Dec-2014
CitationInternational Journal of Hydrogen Energy 40(4): 1945-1958 (2015)
AbstractA 3-electrode half-cell setup consisting of a yttria-stabilized zirconia (YSZ) electrolyte support was employed to investigate the chemical and electrochemical processes occurring in the vicinity of a model hybrid direct carbon fuel cell (HDCFC) anode (Ni-YSZ) in contact with a molten carbon-alkali carbonate slurry. Electrochemical testing, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), with and without the Ni-YSZ layer highlighted the promotional effect of the Ni-YSZ anode layer, and revealed the contributions of Ni/NiO, and potentially K/K2O, redox couple(s). Treated anthracite and bituminous coals, as well as carbon black, were tested, revealing similar open circuit potential and activation energies in mixed 96–4 vol% N2–CO2 and 50–50 vol% CO–CO2 environments between 700 and 800 °C. Bituminous coal showed the highest activity, likely associated to a high O/C ratio and hydrogen content. Based on acquired data, a reaction scheme was proposed for processes at the working electrode, including the role of bubble formation in the vicinity of the electrochemically active solid/molten medium interface.
Publisher version (URL)http://dx.doi.org/10.1016/j.ijhydene.2014.12.012
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