A hybrid-direct carbon fuel cell (HDCFC), consisting of a molten slurry of solid carbon black and (Li-K) 2 CO 3 added to the anode chamber of a solid oxide fuel cell, was characterized using currentpotential-power density curves, electrochemical impedance spectroscopy, and cyclic voltammetry. Two types of experimental setups were employed in this study, an anode-supported full cell configuration (two electrodes, two atmospheres setup) and a 3-electrode electrolyte-supported halfcell setup (single atmosphere). Anode processes with and without catalysts were investigated as a function of temperature (700-800ºC) and anode sweep gas (N 2 , 4-100 % CO 2 in N 2-CO 2). It was shown that the addition of silver based catalysts (Ag, Ag 2 O, Ag 2 CO 3) into the carbon-carbonate slurry enhanced the performance of the HDCFC.

A nano-fibrous, self-supported and lightweight SCR unit endowed with well-connected and open porosity, high reactivity, and tunable chemistry is herein proposed.

Hybrid direct carbon fuel cells (HDCFCs) consisting of a solid carbon (carbon black)-molten carbonate ((62-38 wt% Li-K) 2 CO 3 ) mixtures in the anode chamber of an anode-supported solid oxide fuel cell type full-cell are tested for their electrochemical performance between 700 and 800 • C. Performance was investigated using current-voltage-power density curves. In the anode chamber, catalysts are mixed with the carbon-carbonate mixture. These catalysts include various manganese oxides (MnO 2 , Mn 2 O 3 , Mn 3 O 4 , MnO), metal carbonates (Ag 2 CO 3 , MnCO 3 , Ce 2 (CO 3 ) 3 ), metals (Ag, Ce, Ni), doped-ceria (CeO 2 , Ce 1-x Gd x O 2-x/2 , Ce 1-x REE x O 2-δ (REE = Pr, Sm)) and metal oxides (LiMn 2 O 4 , Ag 2 O). Materials showing the highest activity in carbon black (Mn 2 O 3 , CeO 2 , Ce 0.6 Pr 0.4 O 2-δ , Ag 2 O) were subsequently tested for catalytic activity toward bituminous coal, as revealed by both I-V-P curves and electrochemical impedance spectroscopy (EIS). Catalytic activity was evaluated as a function of various physical characteristics of doped ceria and manganese-based materials.

No abstract