Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCo-LDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction

Zhou, Jiao–Jiao; Han, Xue; Tao, Kai; Li, Qin; Li, Yanli; Chen, Chen; Han, Lei

doi:10.1016/j.cej.2018.08.102

Cited by 222 publications

(70 citation statements)

References 64 publications

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“…[33] In the Co 2p spectrum (Figure 2c), two original peaks are located at 780.5 and 795.8 eV. The peak fits at 780.4 (Co 2p 3/2 ) and 795.6 eV (Co 2p 1/2 ) are assigned to the existence of Co 3 + , [34] and the peak fits at 782.2 (Co 2p 3/2 ) and 797.6 eV (Co 2p 1/2 ) are assigned to Co 2 + in the compound. The additional peaks at approximately 786, 790, 802 and 805 eV are satellite peaks for the Co 2p.…”

Section: Resultsmentioning

confidence: 95%

Facile Synthesis of Flower‐Like MnCo₂O₄@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Huang

Zhu

et al. 2019

ChemPlusChem

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Flower‐like MnCo2O4 was prepared in a self‐assembly process and used in the formation of MnCo2O4@polyaniline (MnCo2O4@PANi) that proceeds by a simple in situ polymerization. The MnCo2O4@PANi‐reduced graphite oxide (MnCo2O4@PANi‐rGO) composite was then synthesized by introducing rGO into MnCo2O4@PANi. This modification improves the overall electronic conductivity of the MnCo2O4@PANi‐rGO because of the dual conductive functions of rGO and PANi; it also provides a buffer for the changes in electrode volume during cycling, thus improving the lithium‐storage performance of MnCo2O4@PANi‐rGO. The electrochemical performance of the samples was evaluated by charge/discharge cycling testing, cyclic voltammetry, and electrochemical impedance spectroscopy. MnCo2O4@PANi‐rGO delivers a discharge capacity of 745 mAh g−1 and a Coulombic efficiency of 100 % after 1050 cycles at a current density of 500 mA g−1, and is a promising anode material for lithium‐ion batteries.

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Section: Resultsmentioning

confidence: 95%

Facile Synthesis of Flower‐Like MnCo₂O₄@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Huang

Zhu

et al. 2019

ChemPlusChem

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“…As well, these peaks at 784.62 eV, 788.86 eV, 797.05 eV and 804.54 eV could be assigned as satellite peaks to Co 2 + 2p and Co 3 + 2p. [25] The conclusion suggested that Co 2 + was transformed into CoO in the annealing of Cu(OH) 2 @ZIF-67 NRs/CF. However, the appearing of Co 3 + was attributed to the oxidation of Co 2 + valence due to the reduction of CuO, which illustrated the existed effect between Cu and Co.…”

Section: Resultsmentioning

confidence: 98%

“…The detailed calculations were based on the equation (4)- (5). The effective electrochemical surface areas (ECSA) of the electrodes is linearly proportional to the corresponding C dI value which is derived from the linear slope of the curve of current density versus scan rate, [25] as shown in Figure S10. The C dl value of the CuO x @CoO NRs/CF was calculated out to be 56.99 mF cm À 2 , which was markedly higher than that of Cu (OH) 2 @ZIF-67 NRs/CF (34.89 mF cm À 2 ), CoO/CF (49.58 mF cm À 2 ) and CuO x NRs/CF (26.51 mF cm À 2 ) ( Figure 4b).…”

Section: Resultsmentioning

confidence: 99%

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuO_x@CoO Nanorods Grown on Cu Foam

Pan¹,

Wang²,

Cai³

et al. 2020

ChemCatChem

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The fabrication of cost‐effective and performance‐advanced electrocatalysts is in great requirements for water splitting to achieve sustainable oxygen production. A simple and effective precursor of ZIF‐67 particles mounted on Cu(OH)2 nanorods was induced by a template alignment method. After annealing, hierarchical CoO polyhedron‐decorated CuO/Cu2O (CuOx) nanorods on Cu foam (denoted as CuOx@CoO NRs/CF) were achieved, which displayed the heterojunction in CuOx components, hierarchical configuration and outward active sites. These features, verified by HRTEM, SEM, XPS and EDX, optimized the oxygen evolution reaction (OER) electrocatalyst. Benefiting from its large electrochemical surface area and the synergetic effect between CuOx and CoO, CuOx@CoO NRs/CF exhibited considerable catalytic activity with a low overpotential of 254 mV to obtain a current density of 10 mA cm−2 in alkaline electrolyte and a scarce loss of the initial catalyst activity over 24 h and over 5000 cycles. This work provides a channel to enhance the performance in OER.

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“…. ARTICLES (Table S1) [27,33,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. The results indicated that the VO-rich Co 2 AlO 4 possessed a high OER kinetics.…”

Section: Methodsmentioning

confidence: 96%

Synthesis of ultrathin Co2AlO4 nanosheets with oxygen vacancies for enhanced electrocatalytic oxygen evolution

et al. 2019

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In this work, we reported the synthesis of twodimensional spinel structure of ultrathin Co 2 AlO 4 nanosheets via dealloying and subsequent annealing processes. Oxygen vacancy defects were further introduced into Co 2 AlO 4 nanosheets by a mild solvothermal reduction method, resulting in large electrochemical surface area and high active site densities, making the related Co atoms get electrons, and producing more empty orbitals. The positive charge of Co and Al atoms adjacent to the O vacancies in VO-rich Co 2 AlO 4 reduced significantly, that is, more electrons are concentrated on the Co and Al atoms. Those electrons closed to the Fermi level have a promoting effect during the H 2 O activation. As a result, the obtained ultrathin Co 2 AlO 4 nanosheets with oxygen vacancies show a low overpotential of 280 mV at the current density of 10 mA cm −2 and a small Tafel slope of 70.98 mV dec −1 . Moreover, it also displays a remarkable stability in alkaline solution, which is superior to most of the reported Co 3 O 4 electrocatalysts. The present work paves a new way to achieve efficient new energetic materials for sustainable community.

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Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCo-LDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction

Cited by 222 publications

References 64 publications

Facile Synthesis of Flower‐Like MnCo₂O₄@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Facile Synthesis of Flower‐Like MnCo₂O₄@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuO_x@CoO Nanorods Grown on Cu Foam

Synthesis of ultrathin Co2AlO4 nanosheets with oxygen vacancies for enhanced electrocatalytic oxygen evolution

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Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCo-LDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction

Cited by 222 publications

References 64 publications

Facile Synthesis of Flower‐Like MnCo2O4@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Facile Synthesis of Flower‐Like MnCo2O4@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuOx@CoO Nanorods Grown on Cu Foam

Synthesis of ultrathin Co2AlO4 nanosheets with oxygen vacancies for enhanced electrocatalytic oxygen evolution

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Facile Synthesis of Flower‐Like MnCo₂O₄@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Facile Synthesis of Flower‐Like MnCo₂O₄@PANi‐rGO: A High‐Performance Anode Material for Lithium‐Ion Batteries

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuO_x@CoO Nanorods Grown on Cu Foam