Effect of Temperature on Physical and Electrochemical Properties of the Monolithic Carbon-Based Bamboo Leaf to Enhanced Surface Area and Specific Capacitance of the Supercapacitor

The ZnCo2O4 nanorods and nanosheets were grown on nickel foam by a facile and effective hydrothermal method, respectively. The effect of the morphologies of the nanostructures on electrochemical performance was investigated. Importantly, ZnCo2O4 nanorod electrodes with a high specific surface area exhibited a higher specific capacitance of 2457.4 F g[Formula: see text] at 2 A g[Formula: see text] and remarkable cycling stability with capacitance retention of 97.7% after 1000 cycles, which are superior to those of ZnCo2O4 nanosheet electrodes. Such a result is well explained. The investigation on the electrochemical properties of these two nanostructures as electrodes confirmed that the morphology of active materials has an important impact on electrochemical properties.

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The effect of temperature on morphology and electrochemical properties of NiCo2S4 by hydrothermal synthesis

Functional Materials Letters ◽

10.1142/s1793604718500637 ◽

2018 ◽

Vol 11 (03) ◽

pp. 1850063

Author(s):

Yanwei Sui ◽

Haihua Hu ◽

Yuanming Zhang ◽

Bin Tang ◽

Jiqiu Qi ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Hydrothermal Method ◽

Current Density ◽

Level Structure ◽

Hydrothermal Process ◽

Effect Of Temperature ◽

Second Step ◽

Carbon Sphere

The hydrothermal method, using the template is a conspicuous way to change the morphology of the product, so it is used widely in many reports. The effect of temperature on morphology of NiCo2S4 by hydrothermal synthesis and its electrochemical properties is distinct as high-performance electrode materials for supercapacitors. With the help of the template (carbon sphere), different morphologies of NiCo2S4 under 90[Formula: see text]C, 120[Formula: see text]C and 180[Formula: see text]C were obtained. They have different properties after electrochemical analysis. In order to build a hierarchical multi-level structure, two-step vulcanization was carried out at each temperature, resulting in the difference in the morphology and performance of the six sample of electrodes. The obtained NiCo2S4 electrodes exhibit 1000[Formula: see text]F[Formula: see text]g[Formula: see text] at the current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text] in the second-step of the hydrothermal process under 120[Formula: see text]C, which is superior to the microblocks NiCo2S4 electrode (90[Formula: see text]C, 888[Formula: see text]F[Formula: see text]g[Formula: see text] at the current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text]) and microparticles NiCo2S4 electrode (180[Formula: see text]C, 574[Formula: see text]F[Formula: see text]g[Formula: see text] at the same current density) in the second-step hydrothermal, which shows a high-rate capability (640[Formula: see text]F[Formula: see text]g[Formula: see text] at 20[Formula: see text]A[Formula: see text]g[Formula: see text]). The obtained nanoparticles NiCo2S4 under 180[Formula: see text]C in the first-step hydrothermal electrode had an excellent cycle retention rate (89.7%), although its specific capacitance was lower. At the same time, the specific capacitance of these sample electrodes obtained in the second-step hydrothermal process is superior to those from the first-step. It was mainly attributed to the fact that temperature can influence the morphology by controlling ion exchange. And our experiment aims to use the hydrothermal method and the template method to find a more suitable temperature range to provide more ideas.

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Facile synthesis of highly porous N-doped CNTs/Fe3C and its electrochemical properties

RSC Advances ◽

10.1039/c6ra07101e ◽

2016 ◽

Vol 6 (50) ◽

pp. 44013-44018 ◽

Cited By ~ 10

Author(s):

Yanzhong Wang ◽

Guoxiang Zhang ◽

Guiwu Liu ◽

Wei Liu ◽

Huiyu Chen ◽

...

Keyword(s):

Specific Surface ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Surface Area ◽

Specific Surface Area ◽

High Specific Capacitance ◽

Large Specific Surface Area ◽

Facile Synthesis ◽

Highly Porous

Porous N-doped CNTs/Fe3C was synthesized by a facile method. N-doped CNTs/Fe3C possesses the large specific surface area up to 1021.26 m2g−1. It exhibits a high specific capacitance of 181 F g−1at 0.1 A g−1and excellent capacitance rate.

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Structure and Electrochemical Properties of Mn3O4 Nanocrystal-Coated Porous Carbon Microfiber Derived from Cotton

Materials ◽

10.3390/ma11101987 ◽

2018 ◽

Vol 11 (10) ◽

pp. 1987 ◽

Cited By ~ 3

Author(s):

Dongya Sun ◽

Liwen He ◽

Yongle Lai ◽

Jiqiong Lian ◽

Jingjing Sun ◽

...

Keyword(s):

Carbon Fiber ◽

Specific Surface ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Surface Area ◽

Porous Carbon ◽

High Specific Surface Area ◽

Cycle Stability ◽

Prepared Material ◽

Carbon Microfiber

Biomorphic Mn3O4 nanocrystal/porous carbon microfiber composites were hydrothermally fabricated and subsequently calcined using cotton as a biotemplate. The as-prepared material exhibited a specific capacitance of 140.8 F·g−1 at 0.25 A·g−1 and an excellent cycle stability with a capacitance retention of 90.34% after 5000 cycles at 1 A·g−1. These characteristics were attributed to the introduction of carbon fiber, the high specific surface area, and the optimized microstructure inherited from the biomaterial.

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Nano Carbon-based as Supercapacitor Electrode from Cocoa Skin

Proceeding International Conference on Science and Engineering ◽

10.14421/icse.v3.493 ◽

2020 ◽

Vol 3 ◽

pp. 175-178

Author(s):

Zulkaisi Dwi Pangarso ◽

Lina Cahyaningsih ◽

Kahfi Imam Faqih Kurnia ◽

Dyah Purwaningsih

Keyword(s):

Specific Capacitance ◽

Surface Area ◽

Electrode Material ◽

Pore Volume ◽

Supercapacitor Electrode ◽

Electrode Resistance ◽

Ft Ir ◽

Nano Carbon ◽

Resistance Value ◽

Carbon Based

Most cocoa shells contain carbon which can be used as an electrode. Through nano carbon, cocoa skin has the potential to be an electrode material in supercapacitors. Nano carbon is a form of carbon that has a large surface area and pore volume. Material characteristics through FT-IR test showed that the intensity of wave absorption in the graphite group (C-C) decreased which indicates an increase in carbon. The XRD results show that carbon nano has a peak of purity close to graphite at 2θ: 24.75º on the lattice values (002). So that the nano carbon based supercapacitor electrode has an electrode resistance value of 0.0307 S/m with a specific capacitance value of 5.19 F/g.

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Synthesis, Characterization, and Electrochemical Properties of Mn3O4/Cr2O3 Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.463-464.555 ◽

2012 ◽

Vol 463-464 ◽

pp. 555-559

Author(s):

Fen Ran ◽

Ling Ren Wang ◽

Lei Zhao ◽

Yong Tao Tan ◽

Ling Bin Kong ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Composite Materials ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Surface Area ◽

Coprecipitation Method ◽

Chemical Coprecipitation ◽

Charge Discharge ◽

Chemical Coprecipitation Method

Mn3O4/Cr2O3composite materials were prepared by a chemical coprecipitation method. The structures were characterized by using SEM and XRD, and the supercapacitive behaviors of these composite materials were investigated with cyclic voltammetry (CV) and charge–discharge tests. Morphology of Mn3O4/Cr2O3composite materials showed that the Mn3O4/Cr2O3composite materials containning a small amount of Cr2O3has a better dispersion compared with that containning a lage amount of it. Owing to the higher surface area and poor crystallization, the Mn3O4/Cr2O3composite materials containning a small amount of Cr2O3show much higher specific capacitance (The highest specific capacitance value of 494 F/g was obtained), and were more promising for applications in supercapacitors.

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External vibrations can destroy the specific capacitance of supercapacitors – from experimental proof to theoretical explanations

Journal of Materials Chemistry A ◽

10.1039/d0ta11794c ◽

2021 ◽

Author(s):

Sudipta Biswas ◽

Vikas Sharma ◽

Trilok Singh ◽

Amreesh Chandra

Keyword(s):

Metal Oxide ◽

Specific Capacitance ◽

Experimental Proof ◽

Carbon Based

External vibrations can destroy the specific capacitance in supercapacitors. Carbon based supercapacitors show a higher ability to absorb the impacts of external vibrations, in comparison to metal oxide based pseudocapacitors.

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Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Scientific Reports ◽

10.1038/s41598-021-81759-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jeongpil Kim ◽

Jeong-Hyun Eum ◽

Junhyeok Kang ◽

Ohchan Kwon ◽

Hansung Kim ◽

...

Keyword(s):

Graphene Oxide ◽

Pore Structure ◽

Specific Capacitance ◽

Surface Area ◽

Thermal Annealing ◽

High Performance ◽

Annealing Process ◽

Supercapacitor Electrode ◽

Simple Method ◽

Surface Areas

AbstractHerein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.

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