摘要：SummaryLow-temperature solid oxide fuel cells (LT-SOFCs) are a promising next-generation fuel cell due to their low cost and rapid start-up, posing a significant challenge to electrode materials with high electrocatalytic activity. Herein, we reported the bimetallic nanoparticles encapsulated in carbon nanotubes (NiFe@CNTs) prepared by carefully controlling catalytic pyrolysis of waste plastics. Results showed that plenty of multi-walled CNTs with outer diameters (14.38 ± 3.84 nm) were observed due to the smallest crystalline size of Ni-Fe alloy nanoparticles. SOFCs with such NiFe@CNTs blended in anode exhibited remarkable performances, reaching a maximum power density of 885 mW cm−2at 500°C. This could be attributed to the well-dispersed alloy nanoparticles and high graphitization degree of NiFe@CNTs to improve HOR activity. Our strategy could upcycle waste plastics to produce nanocomposites and demonstrate a high-performance LT-SOFCs system, addressing the challenges of sustainable waste management and guaranteeing global energy safety simultaneously.Graphical abstractDisplay OmittedHighlights•The M@CNTs from the waste plastics were utilized as anode additive of LT-SOFCs•The effects of active metal species on the quality of nanocomposite were studied•Maximum power density of 885 mW cm−2at 500°C was obtained with NiFe@CNTs•The excellent performances of SOFCs could be attributed to the improved HOR activityElectrochemical energy production; Materials science; Energy materials.
