Morphology tuning of porous CoO nanowall towards enhanced electrochemical performance as supercapacitors electrodes

Tang, Ning; Wang, Wei; You, Huihui; Zhai, Zhangjie; Hilario, Jonas; Zeng, Liang; Zhang, Lei

doi:10.1016/j.cattod.2018.03.024

Cited by 57 publications

(21 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the stacked structure, poor electronic conductivity and obvious volume change limit its application in SCs. It only shows a low specific capacitance of 100-400 F g −1 in practical, which is far below the theoretical value of 4292 F g −1 [18,19]. In order to address these disadvantages, some strategies have been employed, such as coating with carbon materials or conducting polymers to enhance the conductivity and accommodate the large volume change during charge/discharge process [20][21][22].…”

Section: Introductionmentioning

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: Introductionmentioning

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

“…The intensity ratio of D peak over G peak equals to 0.91, indicating the high degree of graphitization of CoP 3 /CP/CoO/NF. Moreover, four peaks located at 191, 474, 479, and 517 cm −1 are confirmed as precise vibration peaks of CoO, highlighting the hierarchical structure of internal CoO nanowire and CoP 3 particle encapsulated in CP 44,45…”

Section: Resultsmentioning

confidence: 75%

“…Moreover, four peaks located at 191, 474, 479, and 517 cm −1 are confirmed as precise vibration peaks of CoO, highlighting the hierarchical structure of internal CoO nanowire and CoP 3 particle encapsulated in CP. [44,45] The chemical states of elements are verified by X-ray photoelectron spectrometer (XPS). The survey spectrum of XPS exhibited in Figure 4c confirms that the CoP 3 /CP/CoO/NF consists of C, N, O, Co, Ni, and P. In Figure 4d, the C 1s spectrum can be split into graphitic carbon (CC/CC) at 284.8 eV, CP/COP at 285.9 eV, and OCO at 288.2 eV, respectively, indicating significant formation of phosphorus and existence of strong bonding between C and P atoms.…”

Section: Resultsmentioning

confidence: 99%

In Situ Growth of CoP₃/Carbon Polyhedron/CoO/NF Nanoarrays as Binder‐Free Anode for Lithium‐Ion Batteries with Enhanced Specific Capacity

2020

Small

View full text Add to dashboard Cite

Advanced functional materials enable lithium‐ion batteries to reach high specific capacity. To achieve this goal, nickel foam (NF), as current collector, is chosen to in situ form aligned nanoarrays composed of CoP3/carbon polyhedron (CP)/CoO. The CoO nanowire acts as bridge to link NF and CoP3/CP which not only reinforces the adhesion between active material and NF but also enhances the capacity of whole electrode. Besides, CoP3 is evenly coupled with CP, which can effectively buffer the volume expansion of CoP3 during the charge/discharge process. Moreover, the novel architecture of CoP3/CP/CoO/NF is beneficial to improve the electronic conductivity. As a result, the CoP3/CP/CoO/NF anode delivers an ultrahigh specific capacity of 1715 mAh g−1 at 0.5 A g−1 which can remain at 1150 mAh g−1 after 80 cycles, demonstrating the good durability. Thus, this work develops a facile strategy to design self‐supporting electrodes for an enhanced energy storage device.

show abstract

“…By comparison, a longer discharge time can clearly be identified for the ONF/CoOx electrode, indicating a higher specific capacity. The mass-specific capacitance of the ONF/CoOx electrode was calculated to be 475 F/g at 1 mA/cm 2 from GCD curves, which is larger than the recently reported CoO nanoparticles on NF substrate using a binder [44]. Figure 5c plots the EIS spectra of four samples in the frequency range of 1000 kHz to 0.01 Hz.…”

Section: Resultsmentioning

confidence: 75%

Binder-Free Nickel Oxide Lamellar Layer Anchored CoOx Nanoparticles on Nickel Foam for Supercapacitor Electrodes

et al. 2020

View full text Add to dashboard Cite

To enhance the connection of electroactive materials/current collector and accelerate the transport efficiency of the electrons, a binder-free electrode composed of nickel oxide anchored CoOx nanoparticles on modified commercial nickel foam (NF) was developed. The nickel oxide layer with lamellar structure which supplied skeleton to load CoOx electroactive materials directly grew on the NF surface, leading to a tight connection between the current collector and electroactive materials. The fabricated electrode exhibits a specific capacitance of 475 F/g at 1 mA/cm2. A high capacitance retention of 96% after 3000 cycles is achieved, attributed to the binding improvement at the current collector/electroactive materials interface. Moreover, an asymmetric supercapacitor with an operating voltage window of 1.4 V was assembled using oxidized NF anchored with cobalt oxide as the cathode and activated stainless steel wire mesh as the anode. The device achieves a maximum energy density of 2.43 Wh/kg and power density of 0.18 kW/kg, respectively. The modified NF substrate conducted by a facile and effective electrolysis process, which also could be applied to deposit other electroactive materials for the energy storage devices.

show abstract

Morphology tuning of porous CoO nanowall towards enhanced electrochemical performance as supercapacitors electrodes

Cited by 57 publications

References 31 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

In Situ Growth of CoP₃/Carbon Polyhedron/CoO/NF Nanoarrays as Binder‐Free Anode for Lithium‐Ion Batteries with Enhanced Specific Capacity

Binder-Free Nickel Oxide Lamellar Layer Anchored CoOx Nanoparticles on Nickel Foam for Supercapacitor Electrodes

Contact Info

Product

Resources

About

Morphology tuning of porous CoO nanowall towards enhanced electrochemical performance as supercapacitors electrodes

Cited by 57 publications

References 31 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

In Situ Growth of CoP3/Carbon Polyhedron/CoO/NF Nanoarrays as Binder‐Free Anode for Lithium‐Ion Batteries with Enhanced Specific Capacity

Binder-Free Nickel Oxide Lamellar Layer Anchored CoOx Nanoparticles on Nickel Foam for Supercapacitor Electrodes

Contact Info

Product

Resources

About

In Situ Growth of CoP₃/Carbon Polyhedron/CoO/NF Nanoarrays as Binder‐Free Anode for Lithium‐Ion Batteries with Enhanced Specific Capacity