A P-doped PtNi alloy supported on N,C-doped TiO2 nanosheets as a stable electrocatalyst for the oxygen reduction reaction in an acidic electrolyte

Abstract

A P-doped PtNi alloy loaded on N,C-doped TiO₂ nanosheets (P–PtNi@N,C–TiO₂) exhibited excellent activity and durability for the oxygen reduction reaction (ORR) in 0.1 M HClO₄ solution with mass (4×) and specific (6×) activity several times higher than those of commercial 20 wt% Pt/C, respectively. The P dopant mitigated the dissolution of Ni and strong interactions between the catalyst and the N,C–TiO₂ support inhibited catalyst migration. This provides a new approach for the design of high-performance non-carbon-supported low-Pt catalysts to be used in harsh acidic environments.