Electrochemical oxidation of sour natural gas over La0.4Ce0.6O1.8–La0.4Sr0.6TiO3±δ anode in SOFC: A mechanism study of H2S effects

Comparison of Different Perovskite Cathodes in Solid Oxide Fuel Cells

“…Various attempts have been made to operate SOFCs with natural gas . However, with natural gas, SOFC anode materials are required to have higher electrocatalytic activity, coking resistance, and H 2 S tolerance . Decomposition of natural gas at the anode can produce a carbon layer, which may block the active sites of the anode and decrease the full cell performance.…”

Highly cost-effective and sulfur/coking resistant VOx-grafted TiO2 nanoparticles as an efficient anode catalyst for direct conversion of dry sour methane in solid oxide fuel cells

“…A detailed mechanistic study can be found elsewhere. 36 Because the thickness of the YSZ electrolyte was 0.3 mm in the present study, the fuel cell performance was largely inuenced by the high ohmic resistance of the electrolyte. As such, EIS analysis was used to further evaluate the performance of the VO x /TiO 2 anode in various fuel environments (see Fig.…”

“…The maximum power density achieved in H 2 at 900 C was 170 mW cm À2 , and decreased to 140 mW cm À2 at 850 C. SOFC performance was enhanced when 0.5% H 2 S was introduced to the feed and the maximum power density reached 200 mW cm À2 in 0.5% H 2 S/H 2 at 900 C. The fact that H 2 S did not decrease but increase the performance of the anode was consistent with and explained in the previous work of our group and other researchers. 2,[36][37][38] The physico-chemically adsorbed sulfur species were actually a promoter of the electrochemical conversion of fuels, possibly via the surface -S-H group that is a more favorable intermediate of H 2 dissociation (comparing to -H). Mukundan et al 39 also showed that VO x /TiO 2 electrocatalysts were not deactivated by H 2 S. Fig.…”

“…The H 2 S in the feed may result in various redox couples, such as -HS/H 2 S, COS/CO and CS 2 /C, that may have facilitated sour gas conversion/oxidation and, thus, enhanced the SOFC performance. 2,36,37 Accordingly, the VO x /TiO 2 anode might have an increased surface density of those redox couples, leading to faster sour gas conversion in the SOFC.…”

Developing a Thermal- and Coking-Resistant Cobalt–Tungsten Bimetallic Anode Catalyst for Solid Oxide Fuel Cells

“…The high stability of the infiltrated LSCF cathode and the LST anode were reported elsewhere. 50,51 Thus, we maintain that the thermal stability of the metallic infiltrates is the key factor governing the long-term robustness of the specific cell (cf. the highly dispersive Co 3 W nanoparticles observed in Figure 1 after 24 h of annealing in H 2 ).…”