Holey graphene interpenetrating networks for boosting high-capacitive Co3O4 electrodes via an electrophoretic deposition process

Yun, Micun; Ma, Yuhong; Zhuo, Chen; Ji, Haomin; Han, Jiemin; Wang, Mei; Tong, Zhaomin; Liu, Xiao; Jia, Suotang; Chen, Xuyuan

doi:10.1016/j.ceramint.2021.06.143

Cited by 12 publications

(4 citation statements)

References 36 publications

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“…can ameliorate the inherent electric conductivity and volume changes in redox reactions of the Co 3 O 4 [ 20 ]. In our previous work, we synthesized holey graphene-coated Co 3 O 4 cubes and obtained a gravimetric capacity of 1085.6 C g −1 , which is notably higher than that of pure Co 3 O 4 cubes [ 21 ]. Nonetheless, these 2D materials usually have a low specific capacity, and the decrease in Co 3 O 4 content will inevitably result in a decrease in the actual specific capacity of active materials [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Cobalt Oxide (CoOx) Nanowires with Different Aspect Ratios for High Performance Hybrid Supercapacitors

Zhuo

et al. 2023

Nanomaterials

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Cobalt oxide (CoOx) nanowires have been broadly explored as advanced pseudocapacitive materials owing to their impressive theoretical gravimetric capacity. However, the traditional method of compositing with conductive nanoparticles to improve their poor conductivity will unpredictably lead to a decrease in actual capacity. The amelioration of the aspect ratio of the CoOx nanowires may affect the pathway of electron conduction and ion diffusion, thereby improving the electrochemical performances. Here, CoOx nanowires with various aspect ratios were synthesized by controlling hydrothermal temperature, and the CoOx electrodes achieve a high gravimetric specific capacity (1424.8 C g−1) and rate performance (38% retention at 100 A g−1 compared to 1 A g−1). Hybrid supercapacitors (HSCs) based on activated carbon anode reach an exceptional specific energy of 61.8 Wh kg−1 and excellent cyclic performance (92.72% retention, 5000 cycles at 5 A g−1). The CoOx nanowires exhibit great promise as a favorable cathode material in the field of high-performance supercapacitors (SCs).

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Section: Introductionmentioning

confidence: 99%

Mesoporous Cobalt Oxide (CoOx) Nanowires with Different Aspect Ratios for High Performance Hybrid Supercapacitors

Zhuo

et al. 2023

Nanomaterials

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“…As a result, the electrochemical behavior of Co 3 O 4 /rGO nanocomposite makes it an obvious option for a high-performance supercapacitor. M. Yun et al [50] used a one-step hydrothermal assembly procedure to make a high-capacitive Co 3 O 4 /HG composite electrode. Holey graphene offers a suitable framework for high electrical conductivity in the prepared electrode; the numerous holes in holey graphene give a shorter ion channel, and the Co 3 O 4 nanoparticles encapsulated in the holey graphene network give high capacitance.…”

Section: Cobalt Oxide-graphene Compositesmentioning

confidence: 99%

Perspective Chapter: Graphene Based Nanocomposites for Supercapacitor Electrodes

Ullah¹,

Khan²,

Rashid³

et al. 2023

Updates on Supercapacitors

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The demand for engineering and advancement of supercapacitor electrodes are increasing globally. To address the production and storage capacity of the supercapacitor electrodes, the development of new kind of composite materials are highly needful. To design materials with high surface area, excellent conductivity, porosity, and mechanical stability are the main critical points that need to be addressed. Various strategies have been utilized to fabricate excellent composite materials for supercapacitor electrodes. The effect of many composite materials was found to enhance the cyclability and storage capacities of the supercapacitor electrodes. In a class of materials, graphene-based nanocomposites and their derivatives were found to be the most excellent and suitable candidates to design and fabricate supercapacitor electrodes. The alliance of several active materials when analyzed with graphene and its derivatives was found to improve further the performance and stability of supercapacitor electrodes.

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“…The rare-earth oxide Co 3 O 4 , owing to its high theoretical capacity, controllable morphology and multiple valence states, has been considered as a competitive material in various fields, including energy storage, catalysis and sensing [ 28 , 29 , 30 ]. However, the poor conductivity and low cycling stability restrict its application as a high-performance active electrode material in supercapacitor and electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Plasma-Engineered N-CoOx Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis

2022

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Surface engineering has achieved great success in enhancing the electrochemical activity of Co3O4. However, the previously reported methods always involve high-temperature calcination processes which are prone to induce agglomeration of the nanostructure, leading to the attenuation of performance. In this work, Co3O4 nanowires were successfully modified by a low-temperature NH3/Ar plasma treatment, which simultaneously generated a porous structure and efficient nitrogen doping with no agglomeration. The modified N-CoOx electrode exhibited remarkable performance due to the synergistic effect of the porous structure and nitrogen doping, which provided additional active sites for faradic transitions and improved charge transfer characteristics. The electrode achieved excellent supercapacitive performance with a maximum specific capacitance of 2862 mF/cm2 and superior cycling retention. Furthermore, the assembled asymmetric supercapacitor (N-CoOx//AC) device exhibited an extended potential window of 1.5 V, a maximum specific energy of 80.5 Wh/kg, and a maximum specific power of 25.4 kW/kg with 91% capacity retention after 5000 charge–discharge cycles. Moreover, boosted hydrogen evolution reaction performance was also confirmed by the low overpotential (126 mV) and long-term stability. This work enlightens prospective research on the plasma-enhanced surface engineering strategies.

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Holey graphene interpenetrating networks for boosting high-capacitive Co3O4 electrodes via an electrophoretic deposition process

Cited by 12 publications

References 36 publications

Mesoporous Cobalt Oxide (CoOx) Nanowires with Different Aspect Ratios for High Performance Hybrid Supercapacitors

Mesoporous Cobalt Oxide (CoOx) Nanowires with Different Aspect Ratios for High Performance Hybrid Supercapacitors

Perspective Chapter: Graphene Based Nanocomposites for Supercapacitor Electrodes

Plasma-Engineered N-CoOx Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis

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