A solid oxide carbon fuel cell operating on pomelo peel char with high power output

The pomelo peel char (PC) was prepared and used as fuel for solid oxide electrolyte direct carbon fuel cells with nickel-yttrium stabilized zirconia anode, thin-film YSZ electrolyte, and La_0.8Sr_0.2MnO₃ cathode. The power densities of fuel cells operating on PC and catalyst-loaded PC (PCC) fuels achieved 309 and 518 mW cm⁻² at 850°C, respectively, which are among the highest power densities reported in the literature on DCFCs. The PC exhibited superior gasification reactivity than coal char due to its unique reticulated foam carbon structure with a homogeneously distributed inherent catalyst. The stability tests at a current density of 50 mA cm⁻² and 825°C indicate that the cell using PC fuel operated in a more stable manner than that using PCC, and the fuel availabilities for PC and PCC were 47.25% and 34.71%, respectively. The results suggest that PC is a promising solid carbonaceous fuel for solid oxide electrolyte direct carbon fuel cells based on its adequate gasification reactivity and high compatibility with the fuel cells.