Journal article
Hybrid direct carbon fuel cell anode processes investigated using a 3-electrode half-cell setup
A 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 96-4vol% N2-CO2 and 50-50vol% 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.
| Language: | English |
|---|---|
| Year: | 2015 |
| Pages: | 1945-1958 |
| ISSN: | 18793487 and 03603199 |
| Types: | Journal article |
| DOI: | 10.1016/j.ijhydene.2014.12.012 |
| ORCIDs: | Kammer Hansen, Kent |
Activation energy Bituminous coal Carbon black Carbon dioxide Carbon monoxide Cyclic voltammetry Cyclic voltammetry (CV) Direct carbon fuel cell (DCFC) Direct carbon fuel cells (DCFC) Electrochemical impedance spectroscopy Electrochemical process Electrochemical testing Electrodes Half-cell Hydrogen contents Nickel Open circuit potential Promotional effect Reaction schemes Working electrode Yttria stabilized zirconia Yttria-stabilized zirconias (YSZ) Zirconia
