scholarly journals Electrodeposited Polyaniline Nanofibers and MoO3 Nanobelts for High-Performance Asymmetric Supercapacitor with Redox Active Electrolyte

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2303
Author(s):  
Wei Meng ◽  
Yanlin Xia ◽  
Chuanguo Ma ◽  
Xusheng Du
Keyword(s):  
High Performance ◽  
Hydrothermal Reaction ◽  
Conductive Polymer ◽  
Negative Electrode ◽  
Superior Performance ◽  
Molybdenum Oxides ◽  
Asymmetric Supercapacitor ◽  
Energy Storage Devices ◽  
Pani Nanofibers ◽  
Redox Active

Transition molybdenum oxides (MoO3) and conductive polymer (polyaniline, PANI) nanomaterials were fabricated and asymmetric supercapacitor (ASC) was assembled with MoO3 nanobelts as negative electrode and PANI nanofibers as a positive electrode. Branched PANI nanofibers with a diameter of 100 nm were electrodeposited on Ti mesh substrate and MoO3 nanobelts with width of 30–700 nm were obtained by the hydrothermal reaction method in an autoclave. Redox active electrolyte containing 0.1 M Fe2+/3+ redox couple was adopted in order to enhance the electrochemical performance of the electrode nano-materials. As a result, the PANI electrode shows a great capacitance of 3330 F g−1 at 1 A g−1 in 0.1 M Fe2+/3+/0.5 M H2SO4 electrolyte. The as-assembled ASC achieved a great energy density of 54 Wh kg−1 at power density of 900 W kg−1. In addition, it displayed significant cycle stability and its capacitance even increased to 109% of the original value after 1000 charge–discharge cycles. The superior performance of the capacitors indicates their promising application as energy storage devices.

scholarly journals Boosting the Electrochemical Performance of Polyaniline by One-Step Electrochemical Deposition on Nickel Foam for High-Performance Asymmetric Supercapacitor

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 270
Author(s):  
Syed Shaheen Shah ◽  
Himadri Tanaya Das ◽  
Hasi Rani Barai ◽  
Md. Abdul Aziz
Keyword(s):  
Energy Storage ◽  
High Performance ◽  
Nickel Foam ◽  
Conductive Polymer ◽  
Negative Electrode ◽  
Electrochemical Performances ◽  
Asymmetric Supercapacitor ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
One Step

Energy generation can be clean and sustainable if it is dependent on renewable resources and it can be prominently utilized if stored efficiently. Recently, biomass-derived carbon and polymers have been focused on developing less hazardous eco-friendly electrodes for energy storage devices. We have focused on boosting the supercapacitor’s energy storage ability by engineering efficient electrodes in this context. The well-known conductive polymer, polyaniline (PANI), deposited on nickel foam (NF) is used as a positive electrode, while the activated carbon derived from jute sticks (JAC) deposited on NF is used as a negative electrode. The asymmetric supercapacitor (ASC) is fabricated for the electrochemical studies and found that the device has exhibited an energy density of 24 µWh/cm2 at a power density of 3571 µW/cm2. Furthermore, the ASC PANI/NF//KOH//JAC/NF has exhibited good stability with ~86% capacitance retention even after 1000 cycles. Thus, the enhanced electrochemical performances of ASC are congregated by depositing PANI on NF that boosts the electrode’s conductivity. Such deposition patterns are assured by faster ions diffusion, higher surface area, and ample electroactive sites for better electrolyte interaction. Besides advancing technology, such work also encourages sustainability.

scholarly journals High Performance Asymmetric Supercapacitor Based on Hierarchical Carbon Cloth In Situ Deposited with h-WO3 Nanobelts as Negative Electrode and Carbon Nanotubes as Positive Electrode

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1195
Author(s):  
Jianhao Lin ◽  
Xusheng Du
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Hydrothermal Reaction ◽  
Synthesis Method ◽  
Negative Electrode ◽  
Current Collector ◽  
Cell System ◽  
Positive Electrode ◽  
Carbon Cloth ◽  
Asymmetric Supercapacitor

Urchin-like tungsten oxide (WO3) microspheres self-assembled with nanobelts are deposited on the surface of the hydrophilic carbon cloth (CC) current collector via hydrothermal reaction. The WO3 nanobelts in the urchin-like microspheres are in the hexagonal crystalline phase, and their widths are around 30–50 nm. The resulted hierarchical WO3 / CC electrode exhibits a capacitance of 3400 mF / cm2 in H2SO4 electrolyte in the voltage window of −0.5 ~ 0.2 V, which makes it an excellent negative electrode for asymmetric supercapacitors. To improve the capacitive performance of the positive electrode and make it comparable with that of the WO3 / CC electrode, both the electrode material and the electrolyte have been carefully designed and prepared. Therefore, the hydrophilic CC is further coated with carbon nanotubes (CNTs) to create a hierarchical CNT / CC electrode via a convenient flame synthesis method, and a redox-active electrolyte containing an Fe2+ / Fe 3+ couple is introduced into the half-cell system as well. As a result, the high performance of the asymmetric supercapacitor assembled with both the asymmetric electrodes and electrolytes has been realized. It exhibits remarkable energy density as large as 403 μW h / cm2 at 15 mW / cm2 and excellent cyclic stability after 10,000 cycles.

In Situ Growth of FeCo-Selenide on Ni Foam as High-Performance Electrode for Electrochemical Energy Storage Devices

NANO ◽  
2018 ◽  
Vol 13 (07) ◽  
pp. 1850078 ◽  
Author(s):  
An Ye ◽  
Jiqiu Qi ◽  
Yanwei Sui ◽  
Fei Yang ◽  
Fuxiang Wei ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Performance ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Storage Device ◽  
Asymmetric Supercapacitor ◽  
Ni Foam ◽  
Energy Storage Devices ◽  
Practical Applications ◽  
Nanosheet Arrays

A solid-state energy storage device has been fabricated using FeCo-selenide nanosheet arrays as positive electrode and Fe2O3 nanorod as negative electrode. As an electrode material, the ternary FeCo-selenide nanosheet arrays supported by Ni foam show a highest specific capacitance of 978 F/g (specific capacity of 163[Formula: see text]mAh/g) at 1 A/g and a superior cycle behavior of 81.2% are obtained after 5000 cycles at current density of 4 A/g. The asymmetric supercapacitor achieves the maximum energy density of 34.6[Formula: see text]W[Formula: see text]h/kg at the power density of 759.6[Formula: see text]W/kg. Furthermore, the superior cycling stability with 83% retention of initial capacitance after 5000 cycles further verify the practical applications of FeCo-selenide//Fe2O3 asymmetric supercapacitor. Meanwhile, the LED bulb and the light board of “CUMT” are lighted by connecting several capacitors to form a series circuit.

scholarly journals Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Xiaona Wang ◽  
Zhenyu Zhou ◽  
Zhijian Sun ◽  
Jinho Hah ◽  
Yagang Yao ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Superior Performance ◽  
High Mass ◽  
Mass Loading ◽  
Energy Storage Devices ◽  
Free Standing ◽  
Cell Potential

Abstract Coaxial fiber-shaped supercapacitors are a promising class of energy storage devices requiring high performance for flexible and miniature electronic devices. Yet, they are still struggling from inferior energy density, which comes from the limited choices in materials and structure used. Here, Zn-doped CuO nanowires were designed as 3D framework for aligned distributing high mass loading of MnO2 nanosheets. Zn could be introduced into the CuO crystal lattice to tune the covalency character and thus improve charge transport. The Zn–CuO@MnO2 as positive electrode obtained superior performance without sacrificing its areal and gravimetric capacitances with the increasing of mass loading of MnO2 due to 3D Zn–CuO framework enabling efficient electron transport. A novel category of free-standing asymmetric coaxial fiber-shaped supercapacitor based on Zn0.11CuO@MnO2 core electrode possesses superior specific capacitance and enhanced cell potential window. This asymmetric coaxial structure provides superior performance including higher capacity and better stability under deformation because of sufficient contact between the electrodes and electrolyte. Based on these advantages, the as-prepared asymmetric coaxial fiber-shaped supercapacitor exhibits a high specific capacitance of 296.6 mF cm−2 and energy density of 133.47 μWh cm−2. In addition, its capacitance retention reaches 76.57% after bending 10,000 times, which demonstrates as-prepared device’s excellent flexibility and long-term cycling stability.

Three-dimensional Co3O4@C@Ni3S2 sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors

2015 ◽  
Vol 3 (31) ◽  
pp. 16150-16161 ◽  
Author(s):  
Dezhi Kong ◽  
Chuanwei Cheng ◽  
Ye Wang ◽  
Jen It Wong ◽  
Yaping Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Solid State ◽  
High Performance ◽  
Three Dimensional ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Cycle Stability ◽  
Asymmetric Supercapacitors

A novel asymmetric supercapacitor composed of Co3O4@C@Ni3S2 NNAs as the positive electrode and activated carbon (AC) as the negative electrode can deliver a high energy density and excellent long cycle stability.

scholarly journals Phenazine–Based Covalent Organic Framework Cathode Materials with High Energy and Power Densities

2019 ◽  
Author(s):  
Edon Vitaku ◽  
Cara Gannett ◽  
Keith Carpenter ◽  
Luxi Shen ◽  
Hector Abruna ◽  
...  
Keyword(s):  
Energy Storage ◽  
Conductive Polymer ◽  
Electrical Energy ◽  
High Energy ◽  
Energy Storage Devices ◽  
Electrical Energy Storage ◽  
Storage Devices ◽  
Redox Sites ◽  
Redox Active ◽  
Power Densities

Redox-active covalent organic frameworks (COFs) are promising materials for energy storage devices because of their high density of redox sites, permanent and controlled porosity, high surface areas, and tunable structures. However, the low electrochemical accessibility of their redox-active sites has limited COF-based devices either to thin films (<250 nm) grown on conductive substrates, or to thicker films (1 µm) when a conductive polymer is introduced into the COF pores. Electrical energy storage devices constructed from bulk microcrystalline COF powders, eliminating the need for both thin-film formation and conductive polymer guests, would offer both improved capacity and potentially scalable fabrication processes. Here we report on the synthesis and electrochemical evaluation of a new phenazine-based 2D COF (DAPH-TFP COF), as well as its composite with poly(3,4-ethylenedioxythiophene) (PEDOT). Both the COF and its PEDOT composite were evaluated as powders that were solution-cast onto bulk electrodes serving as current collectors. The unmodified DAPH-TFP COF exhibited excellent electrical access to its redox sites, even without PEDOT functionalization, and outperformed the PEDOT composite of a previously reported anthraquinone-based system. Devices containing DAPH-TFP COF were able to deliver both high energy (250 Wh/kg) and power densities (2950 W/kg), validating the promise of unmodified redox-active COFs that are easily incorporated into electrical energy storage devices.

scholarly journals In-Situ Synthesis of Heterostructured Carbon-Coated Co/MnO Nanowire Arrays for High-Performance Anodes in Asymmetric Supercapacitors

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3218
Author(s):  
Guoqing Chen ◽  
Xuming Zhang ◽  
Yuanhang Ma ◽  
Hao Song ◽  
Chaoran Pi ◽  
...  
Keyword(s):  
Electron Transfer ◽  
High Performance ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Vanadium Nitride ◽  
Carbon Cloth ◽  
Energy Storage Devices ◽  
Capacitance Performance

Structural design is often investigated to decrease the electron transfer depletion in/on the pseudocapacitive electrode for excellent capacitance performance. However, a simple way to improve the internal and external electron transfer efficiency is still challenging. In this work, we prepared a novel structure composed of cobalt (Co) nanoparticles (NPs) embedded MnO nanowires (NWs) with an N-doped carbon (NC) coating on carbon cloth (CC) by in situ thermal treatment of polydopamine (PDA) coated MnCo2O4.5 NWs in an inert atmosphere. The PDA coating was carbonized into the NC shell and simultaneously reduced the MnCo2O4.5 to Co NPs and MnO NWs, which greatly improve the surface and internal electron transfer ability on/in MnO boding well supercapacitive properties. The hybrid electrode shows a high specific capacitance of 747 F g−1 at 1 A g−1 and good cycling stability with 93% capacitance retention after 5,000 cycles at 10 A g−1. By coupling with vanadium nitride with an N-doped carbon coating (VN@NC) negative electrode, the asymmetric supercapacitor delivers a high energy density of 48.15 Wh kg−1 for a power density of 0.96 kW kg−1 as well as outstanding cycling performance with 82% retention after 2000 cycles at 10 A g−1. The electrode design and synthesis suggests large potential in the production of high-performance energy storage devices.

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