Co Nanoparticles Confined in Mesoporous Mo/N Co‐Doped Polyhedral Carbon Frameworks towards High‐Efficiency Oxygen Reduction

Abstract

AbstractExploiting effective non‐noble metal electrocatalysts for oxygen reduction reaction (ORR) is crucial for fuel cells and metal‐air batteries. Herein, we designed and fabricated Co nanoparticles confined in Mo/N co‐doped polyhedral carbon frameworks (Co‐NP/MNCF) derived from polyoxometalate‐encapsuled metal–organic framework, which showed comparable ORR performance with commercial Pt/C and a larger diffusion‐limited current density. Moreover, the Co‐NP/MNCF also exhibited excellent ORR stability and methanol tolerance. These appealing performances can be attributed to the porosity regulation and heteroatom doping of metal–organic framework derived polyhedral carbon frameworks, which could be beneficial for the exposure of more active sites, the optimization of electronic structure and the mass transfer of electrolyte/electron/ion.