Enhanced electrocatalytic oxygen reduction reaction for Fe–N₄–C by the incorporation of Co nanoparticles

Abstract

Oxygen reduction reaction (ORR) catalytic activity can be improved by means of enhancing the synergy between transition metals. In this work, novel porous Fe-N4-C nanostructure enwrapping uniformly dispersed Co nanoparticle...

Nitrogen‐doped Graphene Loaded with Cobalt Nanoparticles as Efficient Electrocatalysts for Oxygen Reduction Reaction

“…Clearly, Co/NÀ G has the higher specific surface area which may expose more active centers to contact reactants, thereby increasing the ORR activity. [47] The pore-diameter distribution curve of the catalysts shows that the Co/NÀ G possessed a much richer pore structure compared to the NÀ G (Figure 4b). The micropores ChemistrySelect played a vital role for ORR performance improvement, [48] while the mesopores can effectively transport matter.…”

“…The two catalysts have specific surface area (BET) of 598.0 m 2 /g and 351.4 m 2 /g, respectively. Clearly, Co/N−G has the higher specific surface area which may expose more active centers to contact reactants, thereby increasing the ORR activity [47] . The pore‐diameter distribution curve of the catalysts shows that the Co/N−G possessed a much richer pore structure compared to the N−G (Figure 4b).…”

Highly-dispersed and high-metal-density electrocatalysts on carbon supports for the oxygen reduction reaction: from nanoparticles to atomic-level architectures

“…Inspired by this, it is necessary to add some synergistic components to accurately adjust the interaction and make SACs have an optional local environment, hence improving their catalytic performances [141]. The introduction of synergistic components (such as homogeneous NPs [142] or heterogeneous NPs [143]) can controllably adjust the electronic and geometric structures of SACs and improve the graphitization of carbon supports, hence improving the activity, selectivity, and stability of SACs for the ORR [144]. On the contrary, some transition metal SACs (MN 4 sites) can also promote noble metal NPs for the ORR due to the synergistic effects [145,146].…”

Hydrogel-Derived Co3ZnC/Co Nanoparticles with Heterojunctions Supported on N-Doped Porous Carbon and Carbon Nanotubes for the Highly Efficient Oxygen Reduction Reaction in Zn–Air Batteries

“…In addition to the porous structures, M–N x moieties along with compound or metallic NPs are also crucial for ORR catalysis, and several literature studies have confirmed the synergistic effect among the NPs and M–N x moieties. − The bimetallic carbide Co 3 ZnC belongs to these compounds possessing appreciable ORR performance in an alkaline medium . It promotes electron transfer from Co NPs to Co 3 ZnC/Co heterojunctions, thus contributing to the enhanced catalytic activity toward the ORR. , However, in 0.1 M KOH, the Co-based catalysts with the Co 3 ZnC/Co heterojunctions still display the ORR half-wave potentials ( E 1/2 , vs reversible hydrogen electrode (RHE)) more negative than 0.83 V, , inferior than other Co–N–C materials , and hence further modification of Co 3 ZnC/Co-containing catalysts is necessary for the requirement of next-generation energy devices.…”