基于高熵效应的多原子共掺杂碳作为直接液体 燃料电池阴极催化剂的性能研究.

Fuel cells as a new type of clean energy, have become the potential alternatives to traditional fossil fuels. Oxygen reduction reaction (ORR) is the cathode procedure of fuel cells. It is of great significance to study more stable and economical high-activity electrocatalysts for the commercial development of fuel cells. Based on the advantages of high entropy effect, this work prepared multiple transition metal co-doped NSC materials (M-NSC, M =Co, Fe, Ni, Mn, Ce), in order to improve the catalytic performance of cathode catalysts. (CeMnFeCoNi)-NSC catalysts with different metal/carbon ratio were synthesized by high-temperature pyrolysis, and the influence of metal addition amounts on the microstructure and catalytic performance were studied. (CeMnFeCoNi)-NSC shows two-dimensional layered structure, providing a larger specific surface area and more active sites. Then (CeMnFeCoNi)NSC was used as the cathode catalyst of direct methanol fuel cells (DMFC) and direct borohydride fuel cells (DBFC), and the peak power densities were 19. 86 and 73.81 m·W cm-2, respectively, Compared with that of Fe-NC based DMFC and DBFC, the peak power densities were 7.92 and 52. 12 m·W cm-2, respectively. The high performance of (CeMnFeCoNi)NSC is mainly attributed to the M-N4 groups formed by metals and nitrogen, and the synergistic effect among multiple metals. Furthermore, it was found that the superior cell performance was achieved with the metal-to-carbon ratio of 1:50. This study provides a new idea for the composition design and performance regulation of carbon-based electrocatalysts. [ABSTRACT FROM AUTHOR]