Direct CH4-CO2 solid oxide fuel cells combined with Li-doped perovskite dry reforming catalysts for high efficiency power generation

Direct CH4-CO2 solid oxide fuel cells (SOFC) have attracted considerable attention due to their potential for highefficiency power generation with low environmental impact. However, carbon deposition on Ni-based cermet anodes remains a critical challenge, leading to performance degradation. In this study, we propose a novel approach to address this issue by using a Li-doped perovskite, (La0.75Sr0.25)0.95Li0.1Cr0.5Fe0.4Ni0.1O3-delta (LSLCFN), as an exsolution system and a dry reforming catalyst for SOFCs. The LSLCFN catalyst exhibits enhanced carbon dioxide adsorption capacity, effectively reducing carbon deposition on the anode surface. In addition, the incorporation of Ni-Fe alloy nanoparticles facilitates dissolution in a reducing atmosphere and exhibits remarkable stability in the presence of carbon dioxide. Anode-supported single cells incorporating a LSLCFNCe0.9Gd0.1O2-delta(LSLCFN-GDC) composite as the anode active reforming layer exhibit excellent electrochemical performance when operated with both H2 and CH4-CO2 fuels. The peak power densities reach 904.86 and 825.37 mW cm-2 at 800 degrees C, respectively. Furthermore, the LSLCFN-GDC reforming layer maintains stable performance during the dry reforming of a 50%CH4-50%CO2 fuel mixture for 100 h at 700 degrees C, with negligible carbon deposition. These results highlight the effectiveness of employing a dry reforming catalyst to enhance CH4-CO2 reforming and optimize electrochemical performance for efficient energy conversion in SOFCs.

Automated summary

This study proposes a novel approach to address the carbon deposition issue in direct CH4-CO2 solid oxide fuel cells (SOFC) by using a Li-doped perovskite as an exsolution system and a dry reforming catalyst. The results show that this approach effectively reduces carbon deposition and improves the electrochemical performance of fuel cells.