Enhanced electrochemical performance of ball milled CoO for supercapacitor applications

Zheng, Chunrui; Cao, Chuanbao; Ali, Zulfiqar; Hou, Jianhua

doi:10.1039/c4ta02885f

Cited by 118 publications

(39 citation statements)

References 37 publications

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“…The straight line in the Nyquist plot with the slope of 45°, representing the finite‐length diffusion Warburg impedance (i. e., Warburg resistance), is mostly related to the diffusion of electrolyte ions. The electrochemical impedance spectra of these solvent systems were fitted by the ZView software with a typical equivalent electric circuit model (inset in Figure a), where R1 represent the resistance in bulk solution, R2 represents the charge‐transfer resistance, CPE corresponds to the constant phase element, and W1 is the Warburg resistance describing the electrolyte ion transport through the pores of microporous carbons . This model is based on the classical equivalent circuit model in which the capacitors are replaced by CPE representations, due to the non‐ideal capacitive behavior .…”

Section: Resultsmentioning

confidence: 99%

Ion Dynamics of Water‐in‐Salt Electrolyte with Organic Solvents in Nanoporous Supercapacitor Electrodes

Yang

et al. 2020

ChemElectroChem

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Water-in-salt electrolytes blended with organics solvents, that is, organic solvent/water mixed electrolytes, are promising for applications in next-generation energy storage devices vitally needed for industrial electrification and decarbonization. However, the electrolyte ion diffusion behaviors within nanoporous supercapacitor electrodes are poorly understood. Here a systematic investigation into supercapacitor resistances and ion kinetics is carried out experimentally and with numerical simulations. The electrochemical results on the nanoporous electrodes reveal a nonmonotonic (decreasing, increasing, and then decreasing) trend of supercapacitor resistances with increasing solvent mobility, challenging the long-held views that supercapacitor resistances decrease with elevated mobility of organic solvent. The abnormal trend is examined by numerical molecular dynamics simulations of electrolyte ion diffusion within 0.95 nm nanochannels. The electrolyte conductivity is related to cation-anion interactions within nanochannels. We further confirm the crucial interplay of the van der Waals sizes of solvent molecules and channel width in determining electrolyte conductivity in nanoporous electrodes.

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Section: Resultsmentioning

confidence: 99%

Ion Dynamics of Water‐in‐Salt Electrolyte with Organic Solvents in Nanoporous Supercapacitor Electrodes

Yang

et al. 2020

ChemElectroChem

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“…The charge storage is ascribed to the Faradaic redox reactions of CoO and NiO in the PVA-KOH electrolyte as follows: 65,66 However, unlike traditional pseudo-capacitive electrode, the CoO@NiO/ACT//ACT/graphene asymmetric cell displayed a quasi-rectangular CV geometry, indicating an electrochemical double layer capacitor behavior. Figure Based on the above electrochemical analysis, it can be seen that the electrochemical properties of CoO nanostructures are strongly morphology-dependent.…”

Section: Electrochemical Performancementioning

confidence: 98%

Microstructural design of hybrid CoO@NiO and graphene nano-architectures for flexible high performance supercapacitors

2015

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We demonstrate rational design and fabrication of CoO nano-architectures with different morphologies (sheet-like, petal-like and urchin-like) on flexible activated carbon textiles (ACT) by simply changing the reactant concentration.We further unveiled that the electrochemical properties of CoO nanostructures are morphology-dependent. The specific capacitance increased exponentially with the surface/volume ratio of nanostructures. The architecture with higher surface area exhibits better electrochemical performance. Due to its higher surface/volume ratio and better electrochemical performance, urchin-like CoO nanostructure was further chosen as a backbone to deposit NiO nanoflakes to construct a hierarchical core/shell CoO@NiO hybrid nanostructure. Flexible ACTs wrapped with conductive graphene were used as negative material. After coated with PVA-KOH polymer gel which served as both the solid state electrolyte and separator, the flexible core/shell CoO@NiO/ACT//ACT/graphene asymmetric cell exhibited an exceptional combination of electrochemical properties in terms of working potential (1.6 V), energy density (52.26 Wh kg -1 ), maxmium power density (9.53 KW kg -1 ), and cycling stability (97.53% capacitance retention after 2000 cycles even under harsh working condition). Such hierarchical nanostructure on cottonenabled flexible textile substrate should find more applications in next-generation flexible solid-state power sources for future wearable electronics.

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“…Carbon materials such as graphene, carbon nanotubes, and activated carbon are commonly used for double-layer capacitors because of their good electric conductivity, large surface area and outstanding long-term electrochemical stability [7,8]. On the other hand, transition metal oxides and conducting polymers are usually used for pseudocapacitors owing to their high specific capacitance [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

One-step solvothermal synthesis of different morphologies CuS nanosheets compared as supercapacitor electrode materials

Huang

Zhang

Fan

2015

Journal of Alloys and Compounds

178

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Enhanced electrochemical performance of ball milled CoO for supercapacitor applications

Cited by 118 publications

References 37 publications

Ion Dynamics of Water‐in‐Salt Electrolyte with Organic Solvents in Nanoporous Supercapacitor Electrodes

Ion Dynamics of Water‐in‐Salt Electrolyte with Organic Solvents in Nanoporous Supercapacitor Electrodes

Microstructural design of hybrid CoO@NiO and graphene nano-architectures for flexible high performance supercapacitors

One-step solvothermal synthesis of different morphologies CuS nanosheets compared as supercapacitor electrode materials

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