NiCo2O4 with oxygen vacancies as better performance electrode material for supercapacitor

Yan, Dan; Wang, Wei; Luo, Xin; Chen, Chao; Zeng, Yan; Zhu, Zhihong

doi:10.1016/j.cej.2017.10.128

Cited by 238 publications

(135 citation statements)

References 41 publications

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“…Thes pecific capacitance of pure MnO 2 was 143.9 Fg À1 ,w hereas 164.8, 167.4, 181.4, 149 and 137.4 Fg À1 corresponded with ROV-1h, ROV-1.5h, ROV-2h, ROV-2.5h and ROV-3h, respectively.T hese resultsd emonstrated that the specific capacitance of d-MnO 2 was improved by as uitable concentrationo fo xygen vacancies, which was attributed to the higher surfacea dsorbed oxygen concentrationl eading to an increased surface activity and enhanced redox capacity. [49] When increasing the current density up to 10 Ag À1 ,t he capacitance retention rate of pure, ROV-1h, ROV-1.5h, ROV-2h and ROV-2.5h was 42.8 %, 47.8 %, 49.9 %, 53.1 %, 47.4 %a nd 46.9 %, respectively,s uggesting the rate capability was enhanced by the reductiono ft he lattice oxygen concentration (Figure 5d). However,e xcessive concentration of oxygen vacancies may hinder electron transfer and cause poor electrochemical performance.…”

Section: Electrochemical Testsmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO₂

et al. 2019

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Section: Electrochemical Testsmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO₂

et al. 2019

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“…65-3411) appeared in CNZO sample, which can exclude the possibility of solid-solution of ZnO with CoO-NiO. [36] In addition, the yellow dashed box shows lattice defects such as crystal dislocations, lattice distortion, and these defect states provide more oxygen vacancies and reactive sites, which increase the activity of the material and thus improve the electrochemical properties of the material. [24,47,48] In the present case, cubic CoO and cubic NiO both have crystal planes such as (111), (200), and (220).…”

Section: Resultsmentioning

confidence: 99%

“…Then, morphology has a great influence on electrochemical properties of the material. [35,36] Suitable oxygen vacancy concentration dramatically increased fast electron/ions kinetics and electrochemical cites for Faradaic reaction. [30] A large amount of charge is stored because the larger the specific surface area, the more ions in the solution can be in full contact with the active material.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Supercapacitors Based on Interwoven CoO‐NiO‐ZnO Nanowires and Porous Graphene Hydrogel Electrodes with Safe Aqueous Electrolyte for High Supercapacitance

Sun

Wang

et al. 2019

Adv Elect Materials

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pollution. [6,7] The electrode material is an important factor to determine the performance of supercapacitors. [8] At present, electrode materials are roughly classified into four categories: metal oxides, carbon materials, conductive polymers, metal sulfides, and others. Compared with the other materials, metal oxides are favored by researchers because of their low cost and extremely high theoretical specific capacitance. [9] Various metal oxides, such as CoO, [10] NiO, [11] ZnO, [12,13] Co 3 O 4 , [14] Fe 2 O 3 , [15] and MnO 2 [16,17] have been used as electrode materials for supercapacitors. ZnO is one of the typical semiconductor materials. Due to its good electrochemical activity, large specific surface area, low cost, easy manufacturing, and high mechanical flexibility, it is considered to be a promising electrode material for supercapacitors. [12] However, the theoretical specific capacitance of ZnO limits its application in energy storage fields such as supercapacitor. [18] CoO is applied as electrode widely due to its ultra-high theoretical specific capacitance and high redox activity. [19,20] However, the high electrical resistance and poor electrical conductivity during charge and discharge restrict the cycle stability of CoO. As one of the materials currently used in supercapacitor electrode materials, NiO has the advantages of high theoretical specific capacitance and large specific surface area, but it is well known that its cycle stability and rate performance are poor. [21] Therefore, the composite materials obtained by combining several of them can also take advantage of their long complements and fully exert their synergistic effects, so that the comprehensive electrochemical performance is improved significantly so as to solve the problems of single metal oxide electrode. [22,23] For example, the surface/volume ratio of the nanostructures can increase the specific capacitance exponentially. The urchinlike CoO nanostructures were selected as the framework for depositing NiO nanosheets to construct a graded core/shell CoO@NiO hybrid nanostructure. [24] Unfortunately, although it has a good specific capacitance and energy density, its cycle stability is poor. ZnO/CoO composite in situ grown on Ni foam was produced, although the cycle stability is improved, the general specific capacitance is less satisfactory. [25] Compared with the single metal oxides, the energy density, power density, Metal oxides-based supercapacitors have attracted much attention due to their easy fabrication and ultra-high theoretical specific capacitance. Here, a novel ternary metal oxide (CoO-NiO-ZnO, CNZO) in situ grown on Ni foam (CNZO@Ni foam) is prepared by one-pot hydrothermal synthesis and a subsequent annealing method. Compared with the corresponding binary and single metal oxides of CoO-ZnO, NiO-ZnO, CoO-NiO, CoO, NiO, and ZnO, this ternary metal oxide shows an ultra-high specific capacitance (areal capacitance) of 2115.5 F g −1 (4.23 F cm −2 ) at a current density of 1 A g −1 (2 mA cm −2 ). Further, a hybrid sup...

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“…Hence, the capacitance of MCo 2 O 4 (M= Mn, Ni, Cu, and Zn) is high compared to CO. The obtained results in this work is compared with recently published works, as given in Table . Compared to all the recently published works, the presented research work reveals the maximum capacitance value of 1074.0, 1564.2, 2041.7, 1293.2 and 1659.1 F g −1 at a current density of 1 A g −1 for CO, MCO, NCO, CCO, and ZCO nanorods respectively.…”

Section: Resultsmentioning

confidence: 99%

Incorporating Mn²⁺/Ni²⁺/Cu²⁺/Zn²⁺ in the Co₃O₄ Nanorod: To Investigate the Effect of Structural Modification in the Co₃O₄ Nanorod and Its Electrochemical Performance

Mary

Bose

2019

ChemistrySelect

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The major key component for developing a high-efficiency supercapacitor device is electrode and electrolyte material. This research paper demonstrates the structural modification of Co 3 O 4 nanorod and the electrochemical behavior of Co 3 O 4 nanorod in different aqueous electrolytes such as KOH, PVA/ KOH, NaOH, KCl, and Na 2 SO 4 . The pseudocapacitive behavior of Co 3 O 4 is varying in the order of KOH > NaOH > PVA/KOH > Na 2 SO 4 > KCl. The storage capability of MCo 2 O 4 (where M = Mn, Ni, Cu, and Zn) nanorods has been compared with Co 3 O 4nanorod in the KOH electrolyte environment. The material in the form of nanorods is beneficial for an efficient pathway to penetrate an OH À ion into the electroactive material. Among other cobaltite (MCo 2 O 4 ), NiCo 2 O 4 nanorod exhibits the outstanding capacitance value of 2041.7 F g À 1 at a current density of 1 A g À 1 . NiCo 2 O 4 j j NiCo 2 O 4 symmetric supercapacitor system delivers the maximum energy density of 25.42 W h kg À 1 at a current density of 0.5 A g À 1 .

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NiCo2O4 with oxygen vacancies as better performance electrode material for supercapacitor

Cited by 238 publications

References 41 publications

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO₂

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO₂

Hybrid Supercapacitors Based on Interwoven CoO‐NiO‐ZnO Nanowires and Porous Graphene Hydrogel Electrodes with Safe Aqueous Electrolyte for High Supercapacitance

Incorporating Mn²⁺/Ni²⁺/Cu²⁺/Zn²⁺ in the Co₃O₄ Nanorod: To Investigate the Effect of Structural Modification in the Co₃O₄ Nanorod and Its Electrochemical Performance

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NiCo2O4 with oxygen vacancies as better performance electrode material for supercapacitor

Cited by 238 publications

References 41 publications

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO2

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO2

Hybrid Supercapacitors Based on Interwoven CoO‐NiO‐ZnO Nanowires and Porous Graphene Hydrogel Electrodes with Safe Aqueous Electrolyte for High Supercapacitance

Incorporating Mn2+/Ni2+/Cu2+/Zn2+ in the Co3O4 Nanorod: To Investigate the Effect of Structural Modification in the Co3O4 Nanorod and Its Electrochemical Performance

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Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO₂

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO₂

Incorporating Mn²⁺/Ni²⁺/Cu²⁺/Zn²⁺ in the Co₃O₄ Nanorod: To Investigate the Effect of Structural Modification in the Co₃O₄ Nanorod and Its Electrochemical Performance