首页|Engineering rich defects in nitrogen-doped porous carbon to boost oxygen reduction reaction kinetics
Engineering rich defects in nitrogen-doped porous carbon to boost oxygen reduction reaction kinetics
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Metal-free carbon-based materials offer a promising alternative to Pt-based catalysts for the oxygen reduction reaction(ORR).However,challenges persist due to its sluggish kinetics and poor acid ORR performance.Here,we introduce a novel nitrogen-doped porous carbon with rich defects sites(such as pentagons,edge and vacancy defects)(PV/HPC)via a simple etching strategy.The PV/HPC demon-strates long-term stability and exceptional catalytic activity with half-wave potential of 0.9 V and average electron transfer number of 3.98 in alkaline solution while 0.78 V and 3.78 in acidic solution,indicating its efficiency and robustness as an ORR catalyst.Additionally,it achieves a higher kinetic current density of 91.9 mA cm-2 at 0.8 V,which is 1.75 times that of Pt/C(52.5 mA cm-2).Furthemore,it enables Al-air battery to attain a maximum power density of 487 mW cm-2,compared to 477 mW cm-2 for the Pt/C catalyst.Density functional theory(DFT)calculations elucidate that the introduction of multifunctional defects in nitrogen-doped porous carbon collectively reduces the reaction energy barrier of the departure of OH*and boosts the oxygen reduction reaction kinetics.This work presents a simple method to design durable and effective carbon-based ORR catalysts.
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