Li/Na Modified Ni-SDC Anode for Methane-Fueled Solid Oxide Fuel Cells

Abstract

A facile chemical lithium/sodium insertion method has been developed to prepare Li/Na modified-NiO composites (Li/Na-NiO). The single cells were fabricated with a Li/Na modified NiO-Ce 0.8 Sm 0.2 O 1.9 (SDC) composite anode screened on a 300 µm La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3-δ (LSGM) electrolyte and a composite cathode consisting of Sr 0.95 Ce 0.05 CoO 3-δ and SDC (30 wt%). The cells with Li/Na modified Ni-SDC anode material deliver much higher open circuit voltages (OCV) than the cell with pure Ni-SDC anode. When wet CH 4 was used as fuel, the peak power densities of the cells with the Li and Na modified Ni-SDC anode reach about 212mW cm -2 and 231mW cm -2 at 800 o C, respectively, which were much higher than that with the pristine Ni-SDC anode. In addition, the cells with Li/Na modified Ni-SDC anode materials show better long-term stability at 800 o C. The preliminary results demonstrate that the Li/Na modified Ni-SDC anode materials are promising alternative anode for hydrocarbon-fueled solid oxide fuel cells.

Direct operation of methane fueled solid oxide fuel cells with Ni cermet anode via Sn modification

“…There has been considerable interest in the direct operation of solid oxide fuel cells (SOFCs) with hydrocarbon fuels [1][2][3][4][5][6][7][8][9][10][11]. Unlike an internal reforming, directly electrochemical oxidation of hydrocarbon in SOFCs do not need to introduce a substantial amount of H2O, CO2 or O2, which greatly simplifies the system and reduces the cost [12][13]. The most commonly used nickel/yttria-stabilized zirconia (Ni/YSZ) anodes have showed excellent performance in H2 fuel; however, there is serious carbon deposition when hydrocarbon fuels are used [1,2].…”

Recent advances in carbon-resistant anodes for solid oxide fuel cells

“…Moreover, they showed better long-term stability in 70 h, which was attributed to the unique ability of the alkaline metals to absorb H 2 O and CO 2 under the SOFC operating conditions. 141…”

“…Moreover, they showed better long-term stability in 70 h, which was attributed to the unique ability of the alkaline metals to absorb H 2 O and CO 2 under the SOFC operating conditions. 141 Takeguchi et al found that the addition of CaO with strong basicity to Ni-YSZ cermet modified the metal Ni to a slightly cationic state, which was effective in inhibiting carbon deposition without reducing the reforming activity. 24 Asamoto et al also drew a comparable conclusion, namely, that the addition of CaO to the Ni-SDC anode slightly reduced the MPD; however, it enhanced the stability of the SOFC performance and inhibited carbon deposition on the anode.…”

Progress in Solid Oxide Fuel Cells with Hydrocarbon Fuels

“…Liu et al studied the doping of alkali metals (Li or Na) with NiO powder to formulate anode material with enhanced features [59]. Both Li-Ni-SDC and Na-Ni-SDC anodes have been found to increase the capability of adsorbing water vapour and CO 2 under cell operating conditions, enhancing coking tolerance and prevent the deactivation of the anode.…”