Fabricating Pt/CeO2/N-C ternary ORR electrocatalysts with extremely low platinum content and excellent performance

摘要

The research of high efficiency low platinum materials for oxygen reduction reaction (ORR) attracts attention in the field of energy conversion and storage. This study reports a high-efficient ternary ORR electrocatalyst containing N-doped carbon/CeO2-supported platinum catalyst (Pt/CeO2/N-C) with extremely low Pt content, which is fabricated by a facile two-step procedure using polyaniline (PANI) as an N source. The doped chloroplatinic anions are reduced to form evenly dispersed Pt nanoparticles (NPs) incorporated with the N-doped carbon matrix. A combination of Pt NPs with exposed highly active (111) facets, CeO2, and active pyridinic N contributed to enhanced ORR performance and stability. The activity of our Pt-0.1/CeO2/N-C catalyst containing only 5.6 wt of Pt reaches 238.46 mA mg (-1)(Pt), four times advanced than commercial 20Pt/C catalyst (58.8 mA mg (-1)(Pt)). These findings reveal an important new strategy for designing high-yield and cost-effective Pt-based ORR catalysts in simple and easy way. GRAPHICS