One-pot hydrothermal preparation of Cu2O-CuO/rGO nanocomposites with enhanced electrochemical performance for supercapacitor applications

Nathan, D. Muthu Gnana Theresa; Boby, S. Jacob Melvin; Basu, Prabir; Mahesh, R.; Harish, S.; Joseph, Shibu; Sagayaraj, P.

doi:10.1016/j.apsusc.2017.12.199

Cited by 87 publications

(1 citation statement)

References 57 publications

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“…The FTIR spectra were applied to further investigate the phase classification of the obtained composites. As seen in Figure 2c, the peaks located at ∼498 and ∼601 cm −1 correspond to the stretching vibrations of Cu−O, 28,29 further revealing the successful hybrid of CRGO and CCO nanosheets. A thermogravimetry (TG) curve was performed to determine the content of CRGO in the composite.…”

Section: Resultsmentioning

confidence: 85%

Facile Self-Assembly Solvothermal Preparation of CuO/Cu₂O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

et al. 2021

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Copper oxide is considered as a potential anode material for lithium-ion batteries (LIBs), which have attracted huge amounts of research ardor owning to the high capacity and ultrahigh theoretical capacity, twice that of a graphite anode. However, the practical application of the copper oxide anodes is hindered by their inherent properties, including low conductivity and huge volume variation of active materials during the lithiation reaction. Consequently, a novel CuO/Cu 2 O/coal-based reduced graphene oxide nanosheet composite (CCO/CRGO) with porous structure and conductive network was constructed via a mild solvothermal self-assembly method. Thanks to the unique structure, which facilitates the electronic transference and ion diffusion while also easing the volume expansion of copper oxides, the obtained CCO/CRGO anode exhibits a higher reversible capacity of 586 mAh g −1 at 1 A g −1 with impressive stability, and the capacity restored to 767 mAh g −1 when the current density reduced to 0.1 A g −1 . Electrochemical kinetic analysis of CCO/CRGO indicates that the capacitive contribution is the most of the capacity stems, which can improve the rate performance of the CCO/CRGO electrode. Considering the desirable electrochemical performance and the simple synthesis route, CCO/CRGO may be a candidate when used as an anode material for high-rate LIBs.

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Section: Resultsmentioning

confidence: 85%

Facile Self-Assembly Solvothermal Preparation of CuO/Cu₂O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

et al. 2021

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Oriented Catalytic Oxidation Induced Fabrication of CuO/Mn₃O₄ Hierarchical Arrays as Binder‐Free Electrodes for High‐Performance Supercapacitor

Huang

Shi

et al. 2021

Adv Materials Inter

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sulfides, [11] and transition metal oxides (TMOs). [12][13][14][15] TMOs are usually considered to be a potentially ideal electrode material due to their rich valence states and diversified structure styles, enabling efficient Faradaic redox reactions and a high theoretical capacity. [16][17][18] Noteworthy, CuO as one kind of TMOs has been paid exceptional attention on the account of its rich reserves, unique physicochemical properties, non-toxic properties, and environmental stability. [19][20][21] When employed as electrode material for supercapacitors, CuO typically possesses an attractive theoretical capacity of 1800 F g −1 . [22] Unfortunately, single and pristine CuO always suffers from undesirable specific capacity and unsatisfactory cycling stability because of the poor intrinsic conductivity and deteriorating structural collapse during charging/discharging processes, which has critically hindered its application in supercapacitors. [23,24] To address the performance deficiencies of CuO electrode materials, various CuO-based hybrid materials with diversified hierarchical micro-/nano-structures have been explored as the effective alternatives for supercapacitors, which display superior electrochemical performance owing to the improved ionic and electronic transfer. [25,26] In particular, when designed to grow on conductive substrates, the CuO-based hybrid materials could be directly applied as binderfree electrodes for supercapacitors, and generally exhibit much enhanced electronic conductivity and structural stability. [27][28][29][30][31][32][33] Up to now, most of such CuO-based hybrids as binder-free electrodes are usually derived from the Cu(OH) 2 nanoarray templates, which are in-situ grown on Cu or Ni substrates, simply by thermal dehydration. Through subsequent chemical deposition or etching with transition metal salts under specific reaction conditions, the generated CuO nanorod arrays from the Cu(OH) 2 nanoarray templates would evolve into the target products with various hybrid components and rich nanostructures. For example, taking advantage of this strategy, Chen et al. have synthesized CuO@MnO 2 nanowire arrays on Cu grids by the combination of wet etching and hydrothermal deposition, the obtained hybrid electrode displays improved specific capacitance due to the synergistic interaction of each component. [27]

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Core–Shell Nanostructured Hybrid of Nickel Hydroxide Supported on Copper Hydroxide Nanorod Arrays Used as Advanced Supercapacitors with High Efficiency and Ultraperformance

Tian

Zhong

et al. 2021

Advanced Sustainable Systems

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continuously. Therefore, the exploration of new energy storage materials as well as the development of energy storage devices has become the core issues for the utilization and transformation of new energies. [1,2] It is well-known that supercapacitors, as a kind of nontoxic and environment-friendly apparatus for electricity storage and conversion in practical applications, have higher power density and longer cycling capacity, which overcome some drawbacks of traditional dielectric capacitors and chemical batteries. Unfortunately, much lower energy densities of supercapacitors have prevented their extensive applications in energy storage devices.At present, transition metal hydroxides, as a new type of pseudocapacitor materials, have been widely explored and further used in the fields of catalysis, electrochemistry, separation, and biotechnology. As a result, they have been attracting extensive attention from both the academic and industrial circles. Likewise, some inherent advantages of these transition metal hydroxides can be observed including superior redox activity, steerable chemical composition, diversiform physical morphology enormous, Langmuir surface area exposure, inherent high stability of atoms, and good anion exchange behavior. Therefore, the transition metal hydroxide has been broadly used for different electrode materials in the realm of supercapacitors. [3,4] Nevertheless, the electrochemical performance plus the practical application of supercapacitors prepared with transition metal hydroxides are usually hindered by their inherent low electrical conductivities from 10 −13 to 10 −17 S cm −1 . [5] Nickel hydroxide (Ni(OH) 2 ) is a classic transition-metal hydroxide applied in a variety of fields, which has been deemed to be an auspicious electrode on account of its remarkable specific capacitance, low cost, simple operation, and various physical morphologies. [6] However, it has been found that Ni(OH) 2 has poor electrical conductivity, which seriously hinders the transmission of electrons and slows down the redox reaction, resulting in poor rate capability. [7][8][9] Generally, one common strategy for tackling this problem is based on the combination of Ni(OH) 2 and conductive frameworks such as carbon materials, AC, graphene, and copperThe fascinating search for ultraefficient and high-powered supercapacitors has stimulated continuous exploration of diverse energy storage materials like transition metal hydroxides with core-shell structure. Thus in this paper, a novel core-shell hybrid electrode material of nickel hydroxide (Ni(OH) 2 ) supported on copper hydroxide nanorod arrays (Cu(OH) 2 NAs), which is constructed on copper foam as the substrate by an in situ chemical oxidation reaction accompanied by chemical bath deposition, is reported. As a result, it is found that the pre-fabricated Cu(OH) 2 @Ni(OH) 2 electrode has a remarkable areal capacitance of 9.27 F cm −2 and good cycling performance (retains 92.38% after 6000 cycles) compared to its counterpart Cu(OH) 2 nanorods (88.57%). Additio...

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One-pot hydrothermal preparation of Cu2O-CuO/rGO nanocomposites with enhanced electrochemical performance for supercapacitor applications

Cited by 87 publications

References 57 publications

Facile Self-Assembly Solvothermal Preparation of CuO/Cu₂O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

Facile Self-Assembly Solvothermal Preparation of CuO/Cu₂O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

Oriented Catalytic Oxidation Induced Fabrication of CuO/Mn₃O₄ Hierarchical Arrays as Binder‐Free Electrodes for High‐Performance Supercapacitor

Core–Shell Nanostructured Hybrid of Nickel Hydroxide Supported on Copper Hydroxide Nanorod Arrays Used as Advanced Supercapacitors with High Efficiency and Ultraperformance

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One-pot hydrothermal preparation of Cu2O-CuO/rGO nanocomposites with enhanced electrochemical performance for supercapacitor applications

Cited by 87 publications

References 57 publications

Facile Self-Assembly Solvothermal Preparation of CuO/Cu2O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

Facile Self-Assembly Solvothermal Preparation of CuO/Cu2O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

Oriented Catalytic Oxidation Induced Fabrication of CuO/Mn3O4 Hierarchical Arrays as Binder‐Free Electrodes for High‐Performance Supercapacitor

Core–Shell Nanostructured Hybrid of Nickel Hydroxide Supported on Copper Hydroxide Nanorod Arrays Used as Advanced Supercapacitors with High Efficiency and Ultraperformance

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Facile Self-Assembly Solvothermal Preparation of CuO/Cu₂O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

Facile Self-Assembly Solvothermal Preparation of CuO/Cu₂O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

Oriented Catalytic Oxidation Induced Fabrication of CuO/Mn₃O₄ Hierarchical Arrays as Binder‐Free Electrodes for High‐Performance Supercapacitor