O 2 2- /O - functionalized oxygen-deficient Co 3 O 4 nanorods as high performance supercapacitor electrodes and electrocatalysts towards water splitting

Cheng, Guanhua; Kou, Tianyi; Zhang, Jie; Si, Conghui; Gao, Hui; Zhang, Zhonghua

doi:10.1016/j.nanoen.2017.05.043

Cited by 311 publications

(122 citation statements)

References 66 publications

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“…The catalytic performanceso fthe Co 3 O 4 catalysts prepared with different calcination temperatures (300, 400, and5 00 8C) are shown in Figure1 1a.C learly,t he Co 3 O 4 (300) catalysto btained at 300 8Ce xhibits the highest catalytic activitya mong all the Co 3 O 4 catalysts and achieved complete CO conversion at approximately 115 8C. Conversely, the small grains can be reduced to produce more crystal defects, [32] which is consistent with the H 2 -TPR results. The H 2 -TPR profiles of the Co 3 O 4 catalysts are shown in Figure 11 b.…”

Section: In Situ Raman Spectroscopysupporting

confidence: 83%

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Zhang

et al. 2018

ChemCatChem

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Herein, a facile strategy for the in situ growth of a Co3O4‐based precursor with unique hierarchical architectures oriented diagonal or perpendicular to Ni surfaces is reported. This strategy to prepare grafted ZIF‐67@Co3O4 and MOF‐199@Co3O4 precursor structures is based on a simple hydrothermal synthesis method to obtain the Co3O4 precursor and the subsequent in situ growth of ZIF‐67 and MOF‐199, respectively. The morphologies of the Co3O4 products can be tailored by controlling the solvent polarity and concentration of precipitants. CO is chosen as a probe molecule to evaluate the catalytic performance of the as‐synthesized Co3O4‐based oxide catalysts, and the structure–activity relationships are confirmed by using TEM, H2 temperature‐programmed reduction, X‐ray photoelectron spectroscopy, Raman spectroscopy and in situ Raman spectroscopy, and extended X‐ray absorption fine structure analysis. These analysis results demonstrate that irislike Co3O4 exhibits a high catalytic activity for CO oxidation and contains an abundance of surface defect sites (Co3+ species) to result in an excellent low‐temperature reducibility, oxygen vacancies and unsaturated chemical bonds on the surface. Moreover, we used in situ Raman spectroscopy to record the structural transformation of Co3O4 directly during the reaction, which confirmed that CO oxidation on the surface of Co3O4 can proceed through the Langmuir–Hinshelwood mechanism (<200 °C) and the Mars–van Krevelen mechanism (>200 °C).

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Section: In Situ Raman Spectroscopysupporting

confidence: 83%

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Zhang

et al. 2018

ChemCatChem

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“…Compared with other literatures, it has higher energy density and power density. [34][35][36][37] In addition, cycle stability is another significant parameter of supercapacitors. Thus, the stability and durability of the assynthesized Co 3 O 4 -600 electrodes are also evaluated up to 10,000 cycles by the repeated charge-discharge tests at a constant current density of 3 A g À 1 .…”

Section: Capacity Of Co 3 Omentioning

confidence: 99%

Synthesis of Homogeneous Hollow Co₃O₄ Microspheres for Enhanced Cycle Life and Electrochemical Energy Storage Performance

et al. 2020

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How to achieve a balance between excellent pseudocapacitive performance and simplicity of the synthetic pathway of Co3O4 is still a challenge. Herein, hollow Co3O4 microspheres were synthesized through a facile template‐free solvothermal approach with a following calcination treatment. The synthetic Co3O4 exhibited remarkable electrochemical properties in terms of high specific capacity 922.7 F g−1 at 1 A g−1, superior rate capability with 67.7 % capacitance retention (1–20 A g−1), as well as excellent cycling stability (105.6 % retention after 10000 cycles). A hybrid supercapacitor device is also successfully assembled consisting of a Co3O4 cathode and a reduced graphene oxide anode with a wide potential window of 0–1.65 V, which delivers a high energy density and an outstanding cycle lifetime. These superior electrochemical properties will render the hollow Co3O4 microsphere material as an attractive material for promising application in high‐performance electrochemical energy storage systems.

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“…Recently, Zhang et al . found that the defects of electrode materials can be tuned by the annealing in the air . Taking the cobalt oxide as an example (Figure a), rich oxygen vacancies (Co 2+ sites) occurred in the Co 3 O 4 during the calcination process.…”

Section: Recently Emerging Approaches For Surface Engineeringmentioning

confidence: 99%

“…[50] Recently, Zhang et al found that the defects of electrode materials can be tuned by the annealing in the air. [49] Taking the cobalt oxide as an example (Figure 1a), rich oxygen vacancies (Co 2 + sites) occurred in the Co 3 O 4 during the calcination process. As shown in Figure 1b, the Co 3 + /Co 2 + molar ratio of Co 3 O 4 -250 is approximately 1.21, which is much lower than that of pristine Co 3 O 4 (2).…”

Section: Surface Functionalizationmentioning

confidence: 99%

Surface Engineering for Advanced Aqueous Supercapacitors: A Review

Yang

et al. 2019

ChemElectroChem

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Considerable attention has been focused on aqueous supercapacitors (SCs), owing to their large power density and excellent cycling stability, which makes them more suitable for high power applications. However, the lower energy densities (E) of aqueous SCs as compared to batteries have impeded their range of commercial applications. To overcome this challenge, intensive studies have been devoted to the topic, in which surface engineering becomes critical to the high‐performance electrode design due to the efficient manipulation of a material surface to boost energy storage while maintaining the integrity of interior of the material. The purpose of this Minireview article is to highlight recent significant breakthroughs realized through surface engineering approaches such as surface functionalization, heterostructure design, and surface charge modulation. Current challenges, emerging trends, and opportunities for advanced SCs are discussed accordingly.

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O 2 2- /O - functionalized oxygen-deficient Co 3 O 4 nanorods as high performance supercapacitor electrodes and electrocatalysts towards water splitting

Cited by 311 publications

References 66 publications

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Synthesis of Homogeneous Hollow Co₃O₄ Microspheres for Enhanced Cycle Life and Electrochemical Energy Storage Performance

Surface Engineering for Advanced Aqueous Supercapacitors: A Review

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O 2 2- /O - functionalized oxygen-deficient Co 3 O 4 nanorods as high performance supercapacitor electrodes and electrocatalysts towards water splitting

Cited by 311 publications

References 66 publications

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Synthesis of Homogeneous Hollow Co3O4 Microspheres for Enhanced Cycle Life and Electrochemical Energy Storage Performance

Surface Engineering for Advanced Aqueous Supercapacitors: A Review

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Synthesis of Homogeneous Hollow Co₃O₄ Microspheres for Enhanced Cycle Life and Electrochemical Energy Storage Performance