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

• Key Words:OXYGEN REDUCTION REACTION; ENHANCED CATALYTIC-ACTIVITY; REDUCED GRAPHENE OXIDE; HIGHLY EFFICIENT; ACTIVE-SITES; NITROGEN; HYBRID; COMPOSITE; NANOMATERIALS; POLYANILINE
• Abstract: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 20%Pt/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]
• Volume:57
• Issue:1
• Translation or Not:no