Abstract
Solid oxide fuel cells (SOFCs) using oxygen-containing low concentration coal mine methane (O-LCM, CH4<30 %) for power generation are an attractive way to cleanly and efficiently convert abundant O-LCM resources into clean energy. However, direct use of O-LCM for power generation leads to low internal reforming performance and anode coking problems. Therefore, in this study, simulated O-LCM (30 vol% CH4-70 vol% air) was used as fuel and Ni–BaO–CeO2 (NBC) and Ni–BaO-(Ce,Zr)O2 (NBCZ) catalysts were prepared to improve the electrochemical performance and carbon deposition resistance of SOFCs. The composite catalyst containing nanoscale Ni and (Ce,Zr)O2 solid solution with abundant oxygen vacancies are favorable for the enhancement of CH4 reforming and the elimination of carbon deposit. The results show that the NBCZ-modified SOFCs using O-LCM exhibits the much better electrochemical performance, resistance to carbon deposits and discharging stability than the NBC-modified SOFCs. The research provides a strategy for the utilization of O-LCM for power generation via SOFCs.
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