Synthesis of copper-cobalt hybrid oxide microflowers as electrode material for supercapacitors

Jin, Cen; Cui, Yingxue; Zhang, Guofeng; Luo, Wenhao; Liu, Yanxia; Sun, Yan; Tian, Zhangmin; Zheng, Weitao

doi:10.1016/j.cej.2018.02.117

Cited by 75 publications

(22 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S4. Moreover, no satellite peak of Cu 2+ (centered at 942.4 eV) is observed in the spectrum, manifesting the only existence of Cu 0 and Cu + [ 41 , 42 ]. In addition, the Cu LMM Auger spectrum is further used to distinguish the metallic Cu and Cu + ions (Fig.…”

Section: Resultsmentioning

confidence: 99%

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

et al. 2021

View full text Add to dashboard Cite

Although CoO is a promising electrode material for supercapacitors due to its high theoretical capacitance, the practical applications still suffering from inferior electrochemical activity owing to its low electrical conductivity, poor structural stability and inefficient nanostructure. Herein, we report a novel Cu0/Cu+ co-doped CoO composite with adjustable metallic Cu0 and ion Cu+ via a facile strategy. Through interior (Cu+) and exterior (Cu0) decoration of CoO, the electrochemical performance of CoO electrode has been significantly improved due to both the beneficial flower-like nanostructure and the synergetic effect of Cu0/Cu+ co-doping, which results in a significantly enhanced specific capacitance (695 F g−1 at 1 A g−1) and high cyclic stability (93.4% retention over 10,000 cycles) than pristine CoO. Furthermore, this co-doping strategy is also applicable to other transition metal oxide (NiO) with enhanced electrochemical performance. In addition, an asymmetric hybrid supercapacitor was assembled using the Cu0/Cu+ co-doped CoO electrode and active carbon, which delivers a remarkable maximal energy density (35 Wh kg−1), exceptional power density (16 kW kg−1) and ultralong cycle life (91.5% retention over 10,000 cycles). Theoretical calculations further verify that the co-doping of Cu0/Cu+ can tune the electronic structure of CoO and improve the conductivity and electron transport. This study demonstrates a facile and favorable strategy to enhance the electrochemical performance of transition metal oxide electrode materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Meanwhile, the formation of metal oxide as contamination formed only from heating the CuCo‐precursor in N 2 or argon atmosphere. Besides, the porosity property mainly comes from the thermal degradation of PVP in the air …”

Section: Resultsmentioning

confidence: 99%

“…Besides, the porosity property mainly comes from the thermal degradation of PVP in the air. [28] Interestingly, if the PVP was incorporated in the hydrothermal reactors containing the metal oxide precursors, it can be worked as a capping agent that can prevent the agglomeration of particles during the synthesis process of metal oxide. [29] Here, a well-controlled procedure for the preparation of CuCo 2 O 4 porous structures with different morphologies has been established using the surfactant PVP through a hydrothermal reaction at 140°C for 8 h followed by the annealing at 400°C for 4 h in the air.…”

Section: Resultsmentioning

confidence: 99%

Tunability of Porous CuCo₂O₄ Architectures as High‐Performance Electrode Materials for Supercapacitors

et al. 2019

View full text Add to dashboard Cite

Copper cobaltite (CuCo2O4) porous structures with different morphologies are prepared through a hydrothermal method and subsequent annealing process. The tunability of morphologies is succeeded by simply regulation of solvent medium and amount of the polyvinylpyrrolidone (PVP) which is served as structure directing agent. All the prepared samples have a mesoporous nature. Specifically, the CuCo2O4‐porous structures with flowers morphology have a higher surface area (43.2 m2 g−1) and porosity (0.18 cm3 g−1) than the other porous nano structures such as flakes, blades and wires. The maximum specific capacity of CuCo2O4‐Flowers is 466.4 C g−1 at a current density of 2 A g−1. The cycling stability of CuCo2O4‐Flowers shows capacity retention of 86.3 % at a high current density of 15 A g−1 after completion of 5000 charge‐discharge cycles. The electrochemical results demonstrate that the CuCo2O4‐Flower shows superior performance than the CuCo2O4‐Flakes, Blade and Wires.

show abstract

“…It is investigated that copper cobalt hybrid oxide exhibited better specific capacitance 405.36 F/g at 20 A/g with retention capacitance of 99.4%. Asymmetric supercapacitor based on positive electrode of CuCoOH and negative electrode of active copper showed a high energy density of 32.2 Whk/g at 644 Wk/g …”

Section: Introductionmentioning

confidence: 99%

“…Asymmetric supercapacitor based on positive electrode of CuCoO-H and negative electrode of active copper showed a high energy density of 32.2 Whk/g at 644 Wk/g. 26 In this study, hybrid composite La 2-x Co x CuO 4 (x = 0, 0.1, 0.2, and 0.3) was prepared using a cost-effective and facile synthesis method. This hybrid composite is a novel material, which is not reported earlier for supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

et al. 2019

View full text Add to dashboard Cite

Summary Hybrid composites La2‐xCoxCuO4 (x = 0, 0.1, 0.2, and 0.3) are prepared using one‐step simple hydrothermal route as electrodes for supercapacitors. The effect of varying cobalt content on morphological, structural, and electrochemical properties has been explored using X‐ray diffraction, scanning electron microscopy, and cyclic voltammetry, respectively. The structural parameters obtained by X‐ray diffraction showed tetragonal phase of hybrid composite without any evident impurity phases. The analysis of morphological properties suggested a strong correlation with electrochemical properties, for instance, a relationship between fabric porous structures and electrochemically active sites for redox reactions and intercalation/de‐intercalation processes. The hybrid composite electrodes demonstrated high specific capacitance of the order of 1304 F/g at 10 mV/s scan rate and exhibited decreasing trend on increasing scan rate. Hybrid composites were also tested for their ability as an electrode of high performance supercapacitors in different aqueous electrolytes, i. e, KOH, H2SO4, and Na2SO4 to optimize the best compatible electrolyte. The composite electrode material showed excellent cyclic stability and 98% capacitance retention for 1 A/g after 2000 cycles. The remarkable performance of hybrid composite electrode entails its potential for commercial applications of supercapacitors.

show abstract

Synthesis of copper-cobalt hybrid oxide microflowers as electrode material for supercapacitors

Cited by 75 publications

References 57 publications

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

Tunability of Porous CuCo₂O₄ Architectures as High‐Performance Electrode Materials for Supercapacitors

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

Contact Info

Product

Resources

About

Synthesis of copper-cobalt hybrid oxide microflowers as electrode material for supercapacitors

Cited by 75 publications

References 57 publications

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

Tunability of Porous CuCo2O4 Architectures as High‐Performance Electrode Materials for Supercapacitors

Fabrication of novel hybrid composite La2-xCoxCuO4electrode for high performance supercapacitors

Contact Info

Product

Resources

About

Tunability of Porous CuCo₂O₄ Architectures as High‐Performance Electrode Materials for Supercapacitors

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors