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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. [ABSTRACT FROM AUTHOR]

3D hierarchical porous Fe, N‐doped hollow carbon nano‐spheres (Fe−N−C HPNCs) as efficient ORR electrocatalyst were obtained using melamine‐formaldehyde resin (MF) nanospheres as thermal sacrificial hard template to optimize the pore structure and provide nitrogen source to the catalyst. The optimized Fe−N−C HPNCs catalyst exhibited excellent catalytic activity with onset (Eonset) and half‐wave (E1/2) potential (Eonset=1.07 V; E1/2=0.90 V vs. RHE) superior to commercial Pt/C catalyst in 0.1 M KOH solution, and demonstrated excellent stability. When applied as cathode electro‐catalyst in a Zn‐air battery, it produced maximum power density (Pmax) of 127 mW cm−2, which is higher than that of commercial Pt/C (Pmax=119 mW cm−2). It also showed good activity (Eonset=0.89 V; E1/2=0.78 V) in 0.1 M HClO4 electrolyte with significantly enhanced stability (ΔE1/2=−7 mV) relative to the Pt/C catalyst (ΔE1/2=−27 mV). [ABSTRACT FROM AUTHOR]