Self‐Supported ZIF‐Derived Co₃O₄ Nanoparticles‐Decorated Porous N‐Doped Carbon Fibers as Oxygen Reduction Catalyst

Abstract

Oxygen reduction is as ignificant cathodic reaction in the state-of-art clean energyd evices such as fuel cell and metal-oxygenb attery.H ere, ZIF-incorporatedh ybrid polymeric fibres have been fabricated by using ad ual-phase electrospinning method.T hese are then transformed into Co 3 O 4 -nanoparticle-decoratedp orous N-doped carbonf ibres (ZIF-Co 3 O 4 /NCF) through multi-step annealing treatment. The resultant ZIF-Co 3 O 4 /NCF is interweavedi nto as elf-supported film and can be used as ab i-functionalc atalyst for catalysing oxygen reduction in both aqueous and non-aqueous electrolytes. Electrochemicalt ests demonstrate that ZIF-Co 3 O 4 /NCF displays ah igh catalytic activity for oxygen re-ductionw ith ah alf-wavep otential (E 1/2 )o f0.813 V( vs. RHE) and an almost favourable four-electron reduction pathway in alkaline medium. ZIF-Co 3 O 4 /NCF catalysto nly shows 4mV negative shift of E 1/2 after 5000 continuous CV cycles. In addition, the ZIF-Co 3 O 4 /NCF can be applieda st he cathode catalyst of non-aqueousL i-O 2 battery,e xhibiting ar emarkable ORR activity in LiPF 6 contained 1,2-dimethoxyethane electrolyte. The excellent electrocatalytic performance of ZIF-Co 3 O 4 / NCF is probablyd ue to the abundance of active sites of graphitic carbon-wrapped Co 3 O 4 nanoparticles, as well as the cross-linked fibrousnitrogen-doped carbon texture. Yongin-si, Gyeonggi-do 446-701 (South Korea) Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices: A review

“…In addition to Fe-N4 coordinated active sites, pyridinic nitrogen and F-doped carbon fibres can act as additional active sites that have shown a synergistic positive behaviour with Fe-N. Less common electrospun materials have been studied recently such as transition metal oxides [193,[199][200][201][202]. Advantages of metal oxides are their chemically stable structure, easy tunability of electronic properties and electrocatalytic bi-functionality towards ORR and the oxygen evolution reaction (OER), providing application in water electrolysers (PEMWE) and metal-air batteries [193,[199][200][201][202]. Huang et al [34] grew ZnCo2O4 and NiCo2O4 nanowires on the surface of electrospun C fibres with an additional co-precipitation step during synthesis.…”

Binder‐Free Air Electrodes for Rechargeable Zinc‐Air Batteries: Recent Progress and Future Perspectives

“…For decades, numerous researches on highly efficient bifunctional oxygen electrocatalysts have been published. Table 1 summarizes recently studied catalysts with high bifunctional activities, which could be divided to noble metal‐based catalysts [ 68–74 ] , carbon‐based metal‐free catalysts, [ 75–80 ] and transition metal‐based catalysts (including metal/metal alloys [ 81–85 ] , oxides [ 86–88 ] , hydroxides [ 89–92 ] , chalcogenides [ 93–95 ] , phosphides [ 96–99 ] , nitrides [ 100–102 ] , carbides, [ 103–105 ] and MOFs [ 106,107 ] ). Especially, for metal chalcogenides, nitrides, and phosphides, they may be oxidized to the corresponding metal oxides/hydroxides in the oxidative environments of OER.…”

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“…Heterogeneous catalysts such as metal–organic framework derived catalysts could play a key role in the design of green catalytic protocols due to their recoverability, reusability, and stability in chemical processes. [ 1–4 ] Those are also widely used in photovoltaic devices, decomposers, sensors, and batteries. [ 5–7 ] Heterogeneous catalysts have also been to prominence in the field of heterocyclic synthesis because of mild reaction conditions, cost‐effectiveness, simple work‐up, atom economy, easy recyclability, and modifiable surface properties.…”