High-performance Symmetric Supercapacitor Research Articles

Unveiling the synergistic effect of Co3O4/C3N5 architecture for the high performance symmetric hybrid supercapacitor

Unveiling the synergistic effect of Co3O4/C3N5 architecture for the high performance symmetric hybrid supercapacitor

High-performance symmetrical supercapacitor based on coal-derived porous carbon materials prepared via pyrolysis and KOH activation

High-performance symmetrical supercapacitor based on coal-derived porous carbon materials prepared via pyrolysis and KOH activation

Phenothiazine based donor-π-conjugated-donor electrode materials for high performance symmetric supercapacitor applications

Phenothiazine based donor-π-conjugated-donor electrode materials for high performance symmetric supercapacitor applications

Efficient construction of peanut shell-derived N-doped porous carbon materials for high-performance symmetric supercapacitors

Efficient construction of peanut shell-derived N-doped porous carbon materials for high-performance symmetric supercapacitors

Heteroatom-enriched carbon from acacia pods for high-performance symmetric supercapacitors: Balancing gravimetric and volumetric capacities

Heteroatom-enriched carbon from acacia pods for high-performance symmetric supercapacitors: Balancing gravimetric and volumetric capacities

Carbon Nanotubes Decorated Bimetallic Metal–Organic Framework Nanocomposite for High-Performance Symmetric Supercapacitor Device and Their Charge Storage Mechanism

Carbon Nanotubes Decorated Bimetallic Metal–Organic Framework Nanocomposite for High-Performance Symmetric Supercapacitor Device and Their Charge Storage Mechanism

Porous and high specific surface area carbon material derived from ginkgo leaves for high-performance symmetric supercapacitors

Carbon materials have the advantages of large surface area, high conductivity and stable chemical properties, and are widely used in the field of electrochemical energy storage. However, carbon materials currently have some problems such as high cost, complicated process and poor electrochemical performance. The development of low cost, environmental friendly and high specific capacitance porous carbon materials is of great significance for large-scale production and application. In addition, renewable, low-cost biomass materials are ideal precursors for the preparation of porous carbon materials. In this work, porous carbon materials were synthesized using ginkgo leaves as carbon source and KHCO3 as activator. The effect of activator mass on the structure and composition of porous carbon was studied in detail. The results show that when 3 g activator is added, the prepared carbon material (GCK-3) has a specific surface area of up to 2640 m2 g−1 and a rich hierarchical pore structure (including micro, medium and large pores). In addition, the carbon material retains a certain amount of the heteroatoms of the biomass itself, which can generate additional pseudocapacitance. Due to the advantages of composition and structure, GCK-3 shows good electrochemical performance and rate performance. A symmetric supercapacitor assembled from two identical GCK-3 electrodes has an energy density of 13.7 Wh kg−1 and exhibits good cycle stability with a capacitor retention rate of 100 % after 10,000 cycles. The green and low-cost carbon source precursor, simple synthesis method and excellent electrochemical properties all indicate that ginkgo leaf derived carbon materials have great application prospects.

One-Step Carbonization Synthesis of N, S Co-Doped Carbon Materials Derived from Agricultural Waste Peanut Shells for High-Performance Symmetric Supercapacitors.

Biomass carbon has the advantages of wide source, low cost and environmental protection, and has been widely used in the field of electrochemical energy storage. In this work, N and S co-doped carbon materials were prepared by using peanut shell as carbon source and thiourea as activator. When the peanut shell and activator were 2 g and 4 g, respectively, the prepared NSPC-4 had the largest specific surface area and special pore structure. Elemental analysis showed that the activator introduced more N, S and O atoms to the carbon material, and more heteroatoms helped to improve the surface structure of the carbon material and provide additional pseudocapacitance. In addition, NSPC-4 contains a short-range ordered graphite structure, which can provide excellent electrical conductivity. The electrochemical test results show that NSPC-4 has the largest specific capacitance. When the mass of the activator is higher than or below 4 g, the electrochemical performance of the carbon material will be reduced. The symmetric supercapacitor (SSC) assembled by NSPC-4 has an energy density of 8.3 Wh kg-1 when the power density is 350 W kg-1. The synthesis method is not only simple, green and economical, but also has important application value.

Neodymium oxide-based hybrid phase few-layer MoS2 nanocomposite as high-performance symmetric supercapacitor electrode

The two-dimensional layered materials (for example MoS2) are potential electrodes for supercapacitors with their excellent lamellar structure, high surface area, mechanical flexibility, and potential redox activity. However, due to restacking of chemical structure and low electrical conductivity of the pure MoS2 electrodes are prevented for energy storage applications. Therefore the electrodes are made up of a composite by a mixture of MoS2 and rare-earth metals significantly addressing these issues with improved electrical conductivity, large electrochemical active surface, and shorter ion-diffusion kinetics. In the present study, the MoS2 and MoS2/Nd2O3 composite were synthesized by hydrothermal method. The structural phase identification of prepared samples was accomplished by using an X-ray diffractometer (XRD) and Raman spectra. Furthermore, TEM reveals changes in the shape of nanosheets and interlayer spacing. The GCD of symmetric MoS2/Nd2O3 composite electrodes displayed remarkable charging/discharging performance, with increased stability and rate capability. The MoS2/Nd2O3 composite shows utmost Csp of 2528.18 Fg-1 at 1 Ag-1. In addition, the CV and GCD studies suggest that the electrodes exhibit pseudocapacitive behavior and excellent energy density(E) of 191 Wh kg−1 at 1474.1 W kg−1 power density(P) in 1M H2SO4. The supercapacitor device made up of MoS2/Nd2O3 composite shows greater performance in practical LED glowing applications. Therefore, the composites make advancements in energy storage devices like batteries and supercapbatteries due to their excellent energy storage, high electrochemically active surface area, and stability.

Electrochemical evaluation of cobalt oxide incorporated MoS2 ex/PANI ternary composite as a promising electrode for high-performance symmetric and asymmetric supercapacitors

Electrochemical evaluation of cobalt oxide incorporated MoS2 ex/PANI ternary composite as a promising electrode for high-performance symmetric and asymmetric supercapacitors

Cauliflower-like Ni/NiCoP@Boron-doped diamond composite electrodes for high-performance symmetric supercapacitors

Due to the lack of electrocatalytic active sites, the supercapacitors (SCs) even based on the most stable sp3 carbon material (Boron-doped diamond) suffer from poor capacitance and low energy density. Herein, a cauliflower-like biphasic Ni/NiCoP layer has been successfully deposited on the BDD film and further applied as binder-/current collector-free SC electrodes. In a redox-active aqueous electrolyte (0.05 M Fe(CN)63−/4− + 1.0 M KOH), the Ni/NiCoP@BDD electrode with exceptional cyclic stability (∼89.0 % after 10,000 cycles) delivers a specific capacitance of 256.1 mF cm−2 at a current density of 30 mA cm−2, about 2 times higher than that in inert electrolyte. Furthermore, such a symmetric PC device provides a desired energy density of 70.0 Wh kg−1 at a high power density of 3601 W kg−1.

Preparation of N and S heteroatoms doped activated carbon from stalks of Gossypium hirsutum L. flower for high-performance symmetric supercapacitor application

Preparation of N and S heteroatoms doped activated carbon from stalks of Gossypium hirsutum L. flower for high-performance symmetric supercapacitor application

Molten salt-confined construction of biocarbon 2D based on Megathyrsus Maximus biomass for high-performance symmetric supercapacitor

Exploring infinite resources, green strategy, and inexpensive for producing 2D biocarbon nanosheets is an essential method in renewable energy. This study aims to develop a eutectic salt-induced activation process for the production of porous carbon nanosheets with well-controlled microstructure using varying ZnCl2 molarity levels. The results showed that biocarbon featuring thin nanosheets with 2D structure and a high specific surface area of 1294 m2g−1 could be obtained in eutectic salt ZnCl2 at 0.5 molarity with a specific capacitance reaching 495 Fg−1. In addition, the capacitive properties of the cells decreased when the molarity was increased to 0.7 M, leading to a decline in specific capacitance to 171 Fg−1. Based on these results, the new and low-cost strategy of eutectic salt media provided an effective method of converting guinea grass into highly valuable biocarbon in the field of electrochemical energy storage.

The amorphous porous carbon incorporating 1D-nanofiber as electroactive biomass with integrated pyrolysis for high-performance symmetrical supercapacitors

Supercapacitors widely use electroactive biomass as a carbon electrode for energy conversion and storage. In this research, carbon electrodes were fabricated using Nipah mesocarp (NM) as the base material for symmetric supercapacitor cells. NM sample was physically and chemically activated using KOH 0.5 M and CO2 at varying temperatures of 700 °C, 800 °C, and 900 °C. Physical activation is integrated with the carbonization process in a nitrogen atmosphere. A sample obtained by subjecting CO2 to an activation temperature of 800 °C yields a high purity of 90 % carbon atoms with a 1D superstructure (nanofiber structure), which has a high specific surface area of 676 m2g−1 and a high specific capacitance of 300 Fg−1 at 1 Ag−1. Supercapacitors assembled using NM electroactive biomass can achieve a high power density of 146 W kg−1 and an energy density of 42 Wh kg−1 in a 1 M H2SO4. This electroactive biomass has great potential to be considered as an electrode material for energy storage devices or conversions that are abundantly available in the universe, renewable, and economical.

Porous carbon derived from center part of the corn cob for high-performance symmetrical supercapacitors

The central part of agricultural waste biomass corn cob was used as carbon precursor and KHCO3 as activating agent, and porous carbon materials were prepared by one-step carbonization method. The effect of KHCO3 on the structure and properties of porous carbon was studied. The results show that KHCO3 has an etching effect on porous carbon, and the greater the amount of KHCO3, the stronger the etching effect. The obtained biomass porous carbon material has abundant pores, reasonable pore size distribution and high specific surface area, which is conducive to ion transfer and charge storage. In addition, the heteroatom self-doping of porous carbon can improve surface hydrophilicity and generate additional pseudocapacitance, thereby improving its electrochemical properties. Electrochemical characterization shows that the porous carbon has a specific capacitor of up to 323 F g−1. The assembled symmetric supercapacitor (SSC) has an energy density of 20 Wh kg−1 at a power density of 350 W kg−1. This low-cost, high-performance electrode material has potential applications in high-power supercapacitors.

Facile synthesis of MnMoO4 nanostructures arrays as novel electrode materials for high-performance symmetric and asymmetric supercapacitor

Facile synthesis of MnMoO4 nanostructures arrays as novel electrode materials for high-performance symmetric and asymmetric supercapacitor

Highly conductive, mechanically robust and multi-purpose carbon aerogel composites derived from waste bread enable high-performance symmetric supercapacitors

Sustainable biomass-based carbon aerogels have attracted extensive concerns in the area of energy storage and wearable sensory electronics. However, the pristine porosity and low weight of aerogels result in unsatisfactory mechanical and electrical properties, limiting their practical applications. Herein, activated porous carbon (APC), reduced graphene oxide (rGO) and carbon nanoparticles (CNP) are utilized as raw materials to develop a novel type of hierarchically waste bread-derived carbon aerogel via a stepwise activation/calcination strategy. The obtained bread-derived carbon aerogels, named APC-rGO/CNP, exhibits an outstanding electrical conductivity (∼3.23 S cm−1) and a high compressive modulus (∼124.60 MPa) by the synergistic bonding interactions. As a supercapacitor electrode, the APC-rGO/CNP composite manifests an excellent capacitance of 474.8 F g−1 (1.0 A g−1). Furthermore, an all-solid-state symmetric APC-rGO/CNP//APC-rGO/CNP supercapacitor with polyvinyl alcohol/potassium hydroxide (PVA/KOH) gel electrolyte realizes an energy density of 17.4 Wh kg−1 at 895 W kg−1. Notably, even under large compressive stress of 20 kPa, the supercapacitor still achieves a high energy density of 25.6 Wh kg−1 at a power density of 822.8 W kg−1, as well as an excellent capacitance retention of 93.8 % over 10,000 cycles. Finally, we demonstrate the potential of the APC-rGO/CNP composite as a responsive pressure sensor with an ultra-wide detecting span of 0–3 MPa and a moderate sensitivity of 0.22 kPa−1, which can detect keyboard pressing and fist clenching movements distinctively. Overall, the desirable mechanical performances and electrical conductivity of the APC-rGO/CNP composites facilitate the development of versatile nanomaterials to exploit state-of-the-art wearable electronics.

High performance symmetric supercapacitors based on Au incorporated CrN thin films fabricated by reactive magnetron sputtering

Recently, transition metal nitrides are being investigated extensively as potential supercapacitor material. In the present study, Au incorporated CrN (Au_CrN) thin films have been synthesized using reactive magnetron co-sputtering technique for application as supercapacitor electrode material. Films have been prepared at different Ar to N2 flow rates keeping total deposition pressure constant to achieve the required structural phase in the sample. Electrochemical properties of the deposited materials have been investigated with a three-electrode system in 0.5 M H2SO4 aqueous electrolyte. The CrN thin film deposited under 3:1 Ar: N2 partial pressure or flow rate ratio shows the highest specific capacitance. Upon Au incorporation, the film shows an areal capacitance of 56.8 mFcm−2 at 1.0 mAcm−2discharge current density which is an almost nine-fold enhancement in specific capacitance value compared to pristine CrN sample. Symmetric supercapacitors have also been developed by sandwiching two identical Au_CrN thin film electrodes, which have found to deliver excellent specific capacitance of 86.03 mFcm−2at 1.0 mAcm−2 discharge current density with no decline in capacitance value till 20,000 cycles. Furthermore, it can deliver a high energy density of 52.02mWhcm−2and a power density of 0.12mWcm−2. The electrochemical properties of the supercapacitors fabricated with the Au_CrN thin film electrodes are found to be better than most of the results reported so far in the literature with CrN electrodes. Results of the present study clearly demonstrate that these Au enhanced CrN films prepared by easily scalable and highly reproducible magnetron sputtering technique have great potential as a high capacitance supercapacitor electrode material.

Physical activation assisted porous activated carbon from Strychnos Potatorum shells for high-performance symmetric supercapacitors

Herein, low-cost activated carbon (AC) prepared from Strychnos Potatorum shells using CO2 as an activating agent via physical activation technique. Waste biomass-derived AC have the merits of excellent conductivity and highly porous with high-surface area. Electrochemical assessments indicated that the prepared Strychnos Potatorum derived activated carbon (SPAC) electrode exhibited superior electrochemical performance. The experimental data showed that the specific capacitance of 352.5 F g−1 at 0.5 A g−1 and retained 140 F g−1 at 20 A g−1. Symmetric supercapacitors SPAC//SPAC device displayed an impressive specific capacitance of 147 F g−1 at 0.1 A g−1 and an energy density of 20.41 W h kg−1 at 100 W kg−1 and retained 2.7 Wh kg−1 at 10000 W kg−1. Furthermore, these supercapacitors demonstrated exceptional cyclability, maintaining capacity retention of 92.3 % over 10,000 charge–discharge cycles at 1 A g−1. This research work underscores the promising potential of AC materials derived from Strychnos Potatorum shells in development of high-performance supercapacitors.

Design of High-Performance Symmetric Supercapacitor Based on WSe2 Nanoflakes for Energy Storage Applications

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications