Direct carbon dioxide-methane solid oxide fuel cells integrated for high-efficiency power generation with La0.75Sr0.25Cr0.5Fe0.4Ni0.1O3–δ-based dry reforming catalyst

Abstract

Solid oxide fuel cell (SOFC) can directly convert carbon-based fuels to power with low environmental impact and high energy efficiency, while there is still one of the key challenges that carbon deposition over Ni-based cermet anodes causes serious performance degradation. Herein, a Ni-doped perovskite, La0.75Sr0.25Cr0.5Fe0.4Ni0.1O3–δ (LSCFN), is prepared to design exsolution systems and evaluated as the dry reforming catalyst for direct carbon dioxide-methane SOFCs. It is demonstrated that the reducing atmosphere in anode effectively induce the NiFe alloy nanoparticles exsolution from LSCFN, and provide abundant active sites for dry reforming. Anode supported single cells with LSCFN-Ce0.9Gd0.1O2–δ (LSCFN-GDC) composite reforming catalyst show excellent electrochemical performance in both H2 and CH4-CO2, and the peak power densities of 686.05 and 684.83 mW·cm−2 are obtained at 800 ℃, respectively. The dry reforming of 50 %CH4-50 %CO2 integrated with LSCFN-GDC reforming catalyst is sustained for 100 h stable performance at 700 ℃ without any degradation, which are further confined by the experimental verification and thermodynamic calculation. These results demonstrate that additional dry reforming catalyst is an effective strategy to effectively manipulate CH4-CO2 reforming and electrochemical performance for energy purposes.