High catalytic activity of Co<sub>3</sub>O<sub>4</sub> nanoparticles encapsulated in a graphene supported carbon matrix for oxygen reduction reaction

Xie, Guiting; Chen, Bohong; Jiang, Zhongqing; Niu, Xiaojun; Cheng, Siqing; Zhen, Zihao; Jiang, Yu; Rong, Haibo; Jiang, Zhong‐Jie

doi:10.1039/c6ra09528c

Cited by 14 publications

(8 citation statements)

References 61 publications

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“…Accordingly, the electron transfer number, n, was close 3.8, which is a value rather close to 4 of typical Pt [52]. Our methodology was consistent with what was reported in the literature [42,55]. According to a prior study, the Co3O4 catalyzed the ORR in a 2.9 to 3.4-electron route [56].…”

Section: Characterization Of Co3o4@pt/gn For Orr Activitiessupporting

confidence: 90%

Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

et al. 2020

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We demonstrate a facile fabrication scheme for Co3O4@CoO@Co (gradient core@shell) nanoparticles on graphene and explore their electrocatalytic potentials for an oxygen evolution reaction (OER) and an oxygen reduction reaction (ORR) in alkaline electrolytes. The synthetic approach begins with the preparation of Co3O4 nanoparticles via a hydrothermal process, which is followed by a controlled hydrogen reduction treatment to render nanoparticles with radial constituents of Co3O4/CoO/Co (inside/outside). X-ray diffraction patterns confirm the formation of crystalline Co3O4 nanoparticles, and their gradual transformation to cubic CoO and fcc Co on the surface. Images from transmission electron microscope reveal a core@shell microstructure. These Co3O4@CoO@Co nanoparticles show impressive activities and durability for OER. For ORR electrocatalysis, the Co3O4@CoO@Co nanoparticles are subjected to a galvanic displacement reaction in which the surface Co atoms undergo oxidative dissolution for the reduction of Pt ions from the electrolyte to form Co3O4@Pt nanoparticles. With commercial Pt/C as a benchmark, we determine the ORR activities in sequence of Pt/C > Co3O4@Pt > Co3O4. Measurements from a rotation disk electrode at various rotation speeds indicate a 4-electron transfer path for Co3O4@Pt. In addition, the specific activity of Co3O4@Pt is more than two times greater than that of Pt/C.

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Section: Characterization Of Co3o4@pt/gn For Orr Activitiessupporting

confidence: 90%

Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

et al. 2020

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“…Cobalt oxides based materials having superb structural and compositional semblance with enriched electroactive sites are considered as feasible candidate for ORR [ 16 , 17 , 18 ]. Hybridizing two metal oxides has been considered as potential class of alternatives that can significantly boost the electrochemical performance towards ORR [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Carbon Supported Engineering NiCo2O4 Hybrid Nanofibers with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction

et al. 2016

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The design of cheap and efficient oxygen reduction reaction (ORR) electrocatalysts is of a significant importance in sustainable and renewable energy technologies. Therefore, ORR catalysts with superb electrocatalytic activity and durability are becoming a necessity but still remain challenging. Herein, we report C/NiCo2O4 nanocomposite fibers fabricated by a straightforward electrospinning technique followed by a simple sintering process as a promising ORR electrocatalyst in alkaline condition. The mixed-valence oxide can offer numerous accessible active sites. In addition, the as-obtained C/NiCo2O4 hybrid reveals significantly remarkable electrocatalytic performance with a highly positive onset potential of 0.65 V, which is only 50 mV lower than that of commercially available Pt/C catalysts. The analyses indicate that C/NiCo2O4 catalyst can catalyze O2-molecules via direct four electron pathway in a similar behavior as commercial Pt/C catalysts dose. Compared to single NiCo2O4 and carbon free NiCo2O4, the C/NiCo2O4 hybrid displays higher ORR current and more positive half-wave potential. The incorporated carbon matrices are beneficial for fast electron transfer and can significantly impose an outstanding contribution to the electrocatalytic activity. Results indicate that the synthetic strategy hold a potential as efficient route to fabricate highly active nanostructures for practical use in energy technologies.

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“…Also, it was robust to allow the replacement of Zn anode and electrolyte periodically, which could be an ideal cathode electrocatalyst for EVs. Xie et al 117 reported a catalyst consisting of Co 3 O 4 nanoparticles encapsulated in a graphene supported carbon matrix (Co 3 O 4 @C/graphene) with higher electrocatalytic activity and better stability compared with commercial 20 wt % Pt/C. They proved the synergistic coupling between Co 3 O 4 and nitrogen-doped graphene.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

Nanostructured Electrode Materials for High-Energy Rechargeable Li, Na and Zn Batteries

Zhang

Liu

2017

Chem. Mater.

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Fossil fuel is the main energy resource currently. The continuous consumption of this nonrenewable resource has caused very serious environment problems, which has motivated tremendous research efforts in this century. Energy storage is critical to alleviate the current energy and environmental problems. Comparing to mechanical energy storage, rechargeable batteries allow energy storage with a smaller footprint. The intersection of rechargeable battery with nanomaterials has been a booming research topic recently and yielded new applications of nanomaterials as well as new solutions to many long-lived problems in battery science and technology. In this Perspective, we highlight the most recent (2015–2017) examples across lithium, sodium and zinc battery chemistries, where nanoscale materials tailoring and design addresses the intrinsic problems and limitations at both the materials level and device level. And a few principles are generalized at the end.

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High catalytic activity of Co₃O₄ nanoparticles encapsulated in a graphene supported carbon matrix for oxygen reduction reaction

Abstract: A simple method has been adopted for the synthesis of Co3O4 nanoparticles encapsulated in graphene supported carbon matrix, which could exhibit higher catalytic performance for oxygen reduction reaction than the commercial Pt/C.

Cited by 14 publications

References 61 publications

Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

Carbon Supported Engineering NiCo2O4 Hybrid Nanofibers with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction

Nanostructured Electrode Materials for High-Energy Rechargeable Li, Na and Zn Batteries

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High catalytic activity of Co3O4 nanoparticles encapsulated in a graphene supported carbon matrix for oxygen reduction reaction

Abstract: A simple method has been adopted for the synthesis of Co3O4 nanoparticles encapsulated in graphene supported carbon matrix, which could exhibit higher catalytic performance for oxygen reduction reaction than the commercial Pt/C.

Cited by 14 publications

References 61 publications

Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

Facile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytes

Carbon Supported Engineering NiCo2O4 Hybrid Nanofibers with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction

Nanostructured Electrode Materials for High-Energy Rechargeable Li, Na and Zn Batteries

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High catalytic activity of Co₃O₄ nanoparticles encapsulated in a graphene supported carbon matrix for oxygen reduction reaction