Advanced Electrode Materials For Supercapacitors Research Articles

Zeolitic imidazolate framework@graphene oxide nanocomposites for efficient supercapacitor electrodes

Despite advancements in nanoscale electrode materials, the pursuit of dependable, effective, and environmentally sound supercapacitors continues. This study explores the potential of zeolitic imidazolate framework@graphene oxide (ZIF@GO) nanocomposites as a viable option by revealing their improved electrochemical performance, including enhanced charge storage capacity and prolonged cycling stability. The ZIF-8@GO electrode exhibited an exceptional specific capacitance of 1372.67F/g at 1 A/g, indicating remarkable energy storage capacity. Furthermore, it showed exceptional cycling stability and durability by maintaining 96.02% of its capacitance after 20,000 cycles. To further evaluate ZIF-8@GO for energy storage, an asymmetric supercapacitor was assembled using the engineered electrode and activated carbon as the cathode and anode, respectively. The ZIF-8@GO nanostructure device demonstrated outstanding energy storage capability, maintaining a high specific capacitance of 165.29F/g at 1 A/g. Additionally, the device exhibited remarkable stability and endurance after 20,000 cycles, retaining 87.47% of its initial value. The promising electrochemical performance and ability of ZIF-8@GO nanocomposite to maintain capacitance across multiple cycles suggest a potential for advanced supercapacitor electrode materials.

Synthesis and surface engineering of carbon-modified cobalt ferrite for advanced supercapacitor electrode materials

The precise design and surface modification of electrode materials are crucial challenges for advancing the supercapacitor technology. In this study, we report a straightforward two-step process for the synthesis of a cobalt ferrite (CoFe2O4)/carbon hetero nanostructure. The CoFe2O4 nanoparticles were first synthesized using a simple chemical oxidation method, followed by carbon modification using glucose. The modified samples were calcined at 400 and 600 °C for 4 h in N2 atmosphere to optimize the structural and electrochemical properties.. The increase in the grain size of carbon modified cobalt ferrite magnetic nanoparticles (MNPs) was observed from 22 to 28 nm with post annealing temperature. The presence of carbon was confirmed by the FTIR spectroscopy, FESEM and TEM analyses. The carbon decoration on the cobalt ferrite partially showed a core–shell like morphology. The saturation magnetization of bare cobalt ferrite was observed to be 76 emu/g and the same was decreased by the surface modification with carbon. A high specific capacitance of 323 F/g was observed for the carbon-modified cobalt ferrite MNPs annealed at 600 °C. The electrochemical impedance spectroscopy (EIS) analysis demonstrated that the charge-transfer resistance (Rct) decreased significantly in the carbon-modified CoFe2O4 MNPs, particularly for the sample annealed at 600 °C, with an Rct value of 17 Ω. The carbon layer effectively enhanced conductivity and reduced the electrode/electrolyte interface, led to the improved electrochemical performance, as reflected in the enhanced specific capacitance. An improved capacitance retention of 84 % was achieved in the case of carbon-modified cobalt ferrite MNPs based electrode even after 4000 cycles. The study suggested that the prepared carbon-modified cobalt ferrite MNPs stand in the limelight as a better candidate electrode material for the electrochemical applications.

Unraveling the Electrochemical Insights of Cobalt Oxide/Conducting Polymer Hybrid Materials for Supercapacitor, Battery, and Supercapattery Applications.

This review article focuses on the potential of cobalt oxide composites with conducting polymers, particularly polypyrrole (PPy) and polyaniline (PANI), as advanced electrode materials for supercapacitors, batteries, and supercapatteries. Cobalt oxide, known for its high theoretical capacitance, is limited by poor conductivity and structural degradation during cycling. However, the integration of PPy and PANI has been proven to enhance the electrochemical performance through improved conductivity, increased pseudocapacitive effects, and enhanced structural integrity. This synergistic combination facilitates efficient charge transport and ion diffusion, resulting in improved cycling stability and energy storage capacity. Despite significant progress in synthesis techniques and composite design, challenges such as maintaining structural stability during prolonged cycling and scalability for mass production remain. This review highlights the synthesis methods, latest advancements, and electrochemical performance in cobalt oxide/PPy and cobalt oxide/PANI composites, emphasizing their potential to contribute to the development of next-generation energy storage devices. Further exploration into their application, especially in battery systems, is necessary to fully harness their capabilities and meet the increasing demands of energy storage technologies.

Nickel aluminum selenide wrapped by NiCoAl-layered double hydroxide enables a robust structure for supercapacitors

To explore a simple and convenient strategy for the construction of hybrid composites as advanced electrode materials for supercapacitors (SCs), this research realized the construction of nickel − aluminium selenide (NiAlSe)@NiCoAl-layered double hydroxide (NiCoAl-LDH) heterostructure. In-situ hybridization of NiCoAl-LDH nanosheets onto NiAlSe nanoparticles anchored on carbon cloth generates a special core–shell heterostructure, which enhances the exposure of active centers and increases the surface area. The formation of heterogeneous interfaces between NiAlSe and NiCoAl-LDH alters the electronic architecture and accelerates the electron/ion migration. By making full use of the structural benefits and the cooperative effect, the NiAlSe@NiCoAl-LDH composite electrode delivered a large capacitance (Cs) of 1789.2F/g at 1 A/g along with a high retention rate of 94.7 % over 5,000 cycles, which outperforms the bare NiAlSe and NiCoAl-LDH. Meanwhile, the assembled NiAlSe@NiCoAl-LDH hybrid supercapacitor (HSC) attained maximum specific energy (Es) of 71.5 Wh kg−1. This HSC device exhibits superior cyclic durability of 92.1 % after 30,000 cycles. Thereby, this research offers valuable insights into the construction of robust electrode materials for advanced HSC devices.

Controllable Metal–Organic Framework‐Derived NiCo‐Layered Double Hydroxide Nanosheets on Vertical Graphene as Mott–Schottky Heterostructure for High‐Performance Hybrid Supercapacitor

Layered double hydroxide (LDH) is considered a highly promising electrode material for supercapacitors (SCs) due to its high theoretical specific capacitance. However, LDH powders often suffer from poor electrical conductivity, structure pulverization, slow charge transport, and insufficient active sites. Herein, a self‐supporting electrode with a Mott–Schottky heterostructure has been designed for high‐performance SCs. The electrode consists of low crystallinity NiCo‐LDH nanosheets and vertical graphene (VG) directly grown on carbon cloth. The LDH was converted from a metal–organic framework (MOF) by the sol–gel method. This self‐supporting electrode provides fast charge transfer, reducing the pulverization effect and energy barrier. The Mott–Schottky heterostructure of LDH@VG regulates electron density and enhances electron transfer, as confirmed by density functional theory calculation. The optimized LDH@VG heterostructure electrode exhibits an excellent areal capacitance of 5513.8 mF cm−2 and rate capability of 82.1%. Furthermore, the fabricated hybrid SC demonstrates excellent energy density of 404.8 μWh cm−2 at 1.6 mW cm−2 and a remarkable cycling life, with a capacitance of 92.0% after 10 000 cycles. This work not only provides a simple dip‐coating and MOF conversion method to synthesize heterojunction‐based electrodes, but also broadens the horizon for designing advanced electrode materials for SCs.

Dense graphene composite hydrogels as advanced electrode materials for high-performance supercapacitors

In this work, alanine functionalized nanocellulose/graphene composite hydrogels (NCGHalas) were prepared via an easy hydrothermal reaction using alanine, GO, and nanocellulose as reactant. Thanks to this synthesis strategy, NCGHalas exhibited large bulk density, abundant heteroatom functional groups, reasonable porous structure and moderate specific surface area. Based on the above characteristics, the aqueous symmetric supercapacitors (ASSC) assembled by NCGHala25 presented high gravimetric and volumetric specific capacitance of 276.5 F g−1 and 320.8 F cm−3 at 0.3 A g−1, excellent rate performance (77.9 % at 10 A g−1), and long working life of 95.4 % retention after 10,000 cycles at 10 A g−1. Furthermore, the NCGHala25 based ASSC also exhibited large gravimetric and volumetric specific energy densities of 9.6 Wh kg−1 and 11.1 Wh L−1. More importantly, the flexible solid-state supercapacitors (FSSC) fabricated by NCGHala25 and PVA-KOH electrolyte delivered high specific capacitance (178.2 F g−1, 0.3 A g−1), and this value can be maintained for 74.2 % even at 10 A g−1.

Vanadium Oxide-Based Electrode Materials for Advanced Supercapacitors: A Review

Vanadium Oxide-Based Electrode Materials for Advanced Supercapacitors: A Review

β-Ni(OH)2 nanoparticles@activated sugarcane bagasse carbon nanocomposites as an advanced hybrid electrode material for asymmetric supercapacitors

β-Ni(OH)2 nanoparticles (NPs)@activated sugarcane bagasse carbon (ASBC) nanocomposites (N@ASBC NCps) with different Ni loadings were synthesized using a hydrothermal process. The products were characterized using techniques such as X-ray diffraction (XRD), field emission scanning and transmission electron microscopy (FE-SEM and TEM), Raman spectroscopy, and Fourier transform infrared spectroscopy (FT-IR). Electrochemical performance of the products was studied. Interestingly, the maximum specific capacitance of 1213.32 F/g at 1 A/g could be achieved in a 3N@ASBC NCps positive electrode. Concurrently, the ASBC negative electrode revealed a high specific capacitance of 233.34 F/g at 1 A/g. Additionally, the fabricated asymmetric supercapacitor (ASC), ASC-ASBC//3N@ASBC NCps, had a specific capacitance (Csc) of 34.03 F/g at 1 A/g with a specific energy density (Ed) and specific power density (Pd) of 9.93 Wh/kg and 181.26 W/kg, respectively. Moreover, the device could maintain 69.47% of its capacity after a 5000-cycle test.

Chemically Synthesized Sb-Doped SnO2 Nanoparticles for Supercapacitor Application

This study explores the potential of antimony tin oxide (ATO) as an electrode material for supercapacitor applications. ATO, known for its exceptional electrical conductivity and stability, was synthesized using the coprecipitation method followed by calcination. The resulting ATO powder underwent thorough characterization through X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). XRD analysis confirmed the tetragonal morphology and phase purity of ATO nanoparticles, while SEM revealed a sphere-like structure with an irregular surface. FTIR spectroscopy identified various functional groups, including O–H stretching, C–H symmetric and asymmetric vibrations, and the characteristic–SnO2; vibration mode, providing insights into the surface properties crucial for electrochemical performance. Electrochemical evaluations, conducted through cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy, demonstrated a specific capacitance of 140 F/g for the ATO electrode. This notable specific capacitance highlights the potential of ATO as an advanced electrode material for supercapacitors, showcasing its suitability for applications requiring rapid charge-discharge cycles and high specific power. This research contributes to the understanding of ATO’s structural and functional aspects, emphasizing its promising role in advancing supercapacitor technology. The synthesized ATO nanoparticles, characterized by their unique morphology and enhanced electrochemical performance, pave the way for cleaner and more efficient energy storage solutions.

CoNiO2/Co3O4 Nanosheets on Boron Doped Diamond for Supercapacitor Electrodes.

Developing novel supercapacitor electrodes with high energy density and good cycle stability has aroused great interest. Herein, the vertically aligned CoNiO2/Co3O4 nanosheet arrays anchored on boron doped diamond (BDD) films are designed and fabricated by a simple one-step electrodeposition method. The CoNiO2/Co3O4/BDD electrode possesses a large specific capacitance (214 mF cm-2) and a long-term capacitance retention (85.9% after 10,000 cycles), which is attributed to the unique two-dimensional nanosheet architecture, high conductivity of CoNiO2/Co3O4 and the wide potential window of diamond. Nanosheet materials with an ultrathin thickness can decrease the diffusion length of ions, increase the contact area with electrolyte, as well as improve active material utilization, which leads to an enhanced electrochemical performance. Additionally, CoNiO2/Co3O4/BDD is fabricated as the positive electrode with activated carbon as the negative electrode, this assembled asymmetric supercapacitor exhibits an energy density of 7.5 W h kg-1 at a power density of 330.5 W kg-1 and capacity retention rate of 97.4% after 10,000 cycles in 6 M KOH. This work would provide insights into the design of advanced electrode materials for high-performance supercapacitors.

Facile synthesis of NiMoO4@MnO2 nanoflower and waste biomass-derived N, P, and S self-doped carbon for advanced asymmetric supercapacitor electrode materials

Green energy storage technologies have been demonstrated by the use of sustainable biomass-derived carbon as an electrode. Herein, for a high performance all-solid-state asymmetric supercapacitor, we used biowaste material to derive multi-heteroatom doped carbon as a non-faradaic electrode along with NiMoO4@MnO2 Nano-flower-like hybrid structure on nickel foam as a Faradaic electrode. Due to the combined effect of the large specific surface area, hierarchical porous structure of biomass-derived activated carbon (FDAC3) and the highly specific capacitance of the NiMoO4@MnO2 hybrid, designed all-solid-state asymmetric supercapacitor achieved a remarkable specific capacitance of 109.1 F g−1 at 1.4 A g−1 and maximum specific energy of 54.7 Wh/kg within a voltage window of 1.8 V. Moreover, for the practical application of designed cell devices, two different devices were connected in a series to light up different colors light emitting diodes (LEDs). These findings provide new insights to realize the full utilization of biomass waste and a novel low-cost pathway for producing high-performance materials for energy storage applications.

Ternary oxides of MnCuNi nanocomposite for enhanced supercapacitor applications

MnO2/CuO/NiO nanocomposites were synthesized at 180 °C via a straightforward hydrothermal approach. The aqueous solutions of Mn, Cu, and Ni salts were combined with KMnO4 to produce these nanomaterials. The same molar ratios were explored to achieve mixed-oxide active materials. The resultant nanocomposites exhibited a phase blend comprising tetragonal -MnO2, monoclinic -CuO, and cubic -NiO. Specifically, the Mn:Cu:Ni nanocomposite with a 1:1:1 ratio showed an impressive specific capacitance of 754.61Fg-1 at a scan rate of 5 mVs−1 and maintained 74 % of its capacity after 5000 cycles, indicating its excellent cyclic stability. This composite electrode surpassed all individual electrodes tested, highlighting its potential as a superior electrode material for supercapacitors. Regarding its performance metrics, the areal capacitance was recorded at 108.79 mFcm−2, while the areal energy and power densities were 0.0283 mWhcm-2 and 0.315 mWcm−2, respectively. These findings signify a significant stride in the development of advanced electrode materials for supercapacitors, suggesting potential applications in other transition-metal-oxide-based electrode innovations.

Nickel-cobalt layer double hydroxide @ lignin-based hollow carbon quasi core-shell structure for high-performance supercapacitors

The physicochemical properties of an advanced supercapacitor electrode material can be co-tailored by incorporating various active materials into a hierarchical micro-/nano-architecture with a core-shell structure. Herein, we presented the development of high-performance supercapacitor electrode materials of quasi core-shell architectures based on nickel-cobalt layered double hydroxides supported on lignin-based hollow carbon (NiCoLDH@LHC) nanocomposites. The synthesis involves a novel approach combining enzymatic hydrolysis lignin (EHL) as a carbon source and magnesium oxide (MgO) as a template, utilizing evaporation-induced self-assembly (EISA) followed by carbonization. The manipulation of the mass ratio of NiCoLDH/LHC can induce alterations in its apparent morphology, stratified porosity, and active site, thereby an influence on its electrochemical performance. The optimal NiCoLDH@LHC90 nanocomposites display a unique flower-like spherical structure with open pores, a substantial specific surface area (SSA), and numerous electrochemically active sites. In addition, the density functional theory (DFT) calculations demonstrate that the higher density of Ni3+/Co3+ cations induced by the incorporation of LHC can increase the conductivity of NiCoLDH materials. Notably, these nanocomposites exhibit a remarkable specific capacitance of up to 640 C g−1 at 1 A g−1, with exceptional cycling stability (93.66% retention over 10,000 cycles). Furthermore, an assembled NiCoLDH@LHC90//LHC asymmetric supercapacitor demonstrates an impressive energy density (power density) of 35.44 Wh kg−1 (200.01 W kg−1). The physicochemical properties of an advanced supercapacitor electrode material can be finely tuned by incorporating various active materials into a hierarchical micro-/nano-architecture with a core-shell structure.

Exploring the potential of reduced graphene oxide/polyaniline (rGO@PANI) nanocomposites for high-performance supercapacitor application

This study introduces a facile synthesis method for synthesizing reduced graphene oxide (rGO) nanosheets with surface decoration of polyaniline (PANI). The resultant rGO@PANI nanocomposite (NC) exhibit substantial potential as advanced electrode materials for high-performance supercapacitors. The strategic integration of PANI onto the rGO surface serves dual purposes, effectively mitigating agglomeration of rGO films and augmenting their utility in supercapacitor applications. The PANI coating manifests a highly porous and nanosized morphology, fostering increased surface area and optimized mass transport by reducing diffusion kinetics. The nanosized structure of PANI contributes to the maximization of active sites, thereby bolstering the efficacy of the nanocomposites for diverse applications. The inherent conductive nature of the rGO surface significantly expedites electron transport, thereby amplifying the overall electrochemical performance of the nanocomposites. To systematically evaluate the influence of PANI concentration on the electrode performance, varying concentrations of PANI were incorporated. Notably, an elevated PANI concentration was found to enhance the response owing to the unique morphology of PANI. Remarkably, the 5 % rGO@PANI NC emerged as the most promising candidate, demonstrating exceptional response characteristics with a specific capacitance of 314.2 F/g at a current density of 1 A/g. Furthermore, this catalyst exhibits outstanding long-term stability, retaining approximately 92 % of its capacitance even after enduring 4000 cycles. This research underscores the significance of the synergistic integration of rGO and PANI in the design of high-performance supercapacitors. The elucidation of the underlying mechanisms governing the improved electrochemical properties contributes to the fundamental understanding of nanocomposite behavior, thereby paving the way for the rational design of next-generation energy storage materials.

Development of CNT/Fe2O3 nanocomposites as electrode materials for advanced supercapacitors

Investigating the electrochemical behavior of the CNT/Fe2O3 nanocomposite revealed compelling insights. TEM analysis confirmed the uniform attachment of Fe2O3 nanoparticles to the surface of CNTs. Consequently, in the three-electrode system, the CNT/Fe2O3 nanocomposite hybrid electrode exhibited impressive electrochemical performance. Achieving a high capacitance of approximately 512 F/g at a current density of 1 A/g, the CNT/Fe2O3 nanocomposite electrode showcased a remarkable energy density of 29.5 Wh/kg at a power density of 2.8 kW/kg. The exceptional electrochemical properties of CNT Fe2O3 nanocomposites position them as promising electrode materials for supercapacitors.

Synthesis of surfactant-assisted nickel ferrite nanoparticles (NFNPs@surfactant) to amplify their application as an advanced electrode material for high-performance supercapacitors.

Nickel ferrite nanoparticles (NFNPs) were synthesized in an alkaline medium (pH ∼ 11) using a wet chemical co-precipitation technique. To probe the effect of surfactants on the surface morphology, particle size and size distribution of nanoparticles; two surfactants, namely, cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulphate (SDS), were applied. The native and surfactant-assisted nickel ferrite NPs were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), dynamic light scattering (DLS) and transmission electron microscopy (TEM). The addition of surfactants (CTAB/SDS) effectively controlled the secondary growth of nickel ferrite particles and reduced their size, as examined by XRD, AFM, DLS, SEM and TEM. Characterization technique results affirmed that CTAB is a more optimistic surfactant to control the clustering, dispersion and particle size (∼22 nm) of NFNPs. To identify the impact of ferrite particle size on charge storage devices, their electrochemical properties were studied by using cyclic voltammetry (CV), galvanic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) in 1 M KOH electrolyte through three-electrode assembly. NiFe2O4@CTAB showed a specific capacity of 267.1 C g-1, specific capacitance of 593.6 F g-1 and energy density of 16.69 W h kg-1, which was far better than the performances of other synthesized native NFNPs and NiFe2O4@SDS having larger surface areas.

Enhancing the electrochemical and photoelectrochemical effects in CNTs@CoMgS@AC nanocomposite based electrode materials for advanced hybrid supercapacitors

Hybrid supercapacitors (HSCs) have received a lot of interest because of their excellent stability and energy storage capacity. To design a HSC device, we synthesized cobalt magnesium sulfide (CoMgS) using an easy hydrothermal technique. Thesurface properties, crystallinity, elemental analysis, and homogeneity are analysed. The CNT@CoMgS nanocomposite is demonstrated a considerably improved specific capacity (Qs) of 698.88C/g or 1164.8F/g compared to the other samples. The CNT@CoMgS//AC-based HSC revealed a high Qs value of 249.88C/g and an energy density of 70 Wh/kg with an astonishing power density of 880 W/kg. In photoelectrochemical activity, the CNT@CoMgS electrode exhibited a fast response and recovery time with good photoactivity, which is used to perform excellent photo switching. Hence, the CNT@CoMgS@AC electrode demonstrated extraordinary performance because of its largesurface area, quick transport of charge carriers, and extraordinary rate capability, which emphasizes its promise for electrochemical energy storage applications.

Cobalt- and calcium-based metal–organic frameworks (MOFs) as an advanced electrode material for supercapacitors

ABSTRACT Cobalt- and calcium-based metal–organic frameworks (Co-MOF and Ca-MOF) [Co (tpa) (Mi) and Ca (tpa)] (tpa = terephthalic acid and Mi = methyl imidazole) were synthesised through solvothermal method. Structural characterisation revealed that metal centres are equally occupied by Co2+ and Ca2+ ions. Supercapacitive behaviour of synthesised Co-MOF and Ca-MOF was evaluated using cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS) measurements in 6 M KOH as electrolyte. The Co- and Ca-MOFs exhibited outstanding specific capacitance of 1726 and 185 Fg−1 at a discharge current density of 1 Ag−1, good rate capability, and 97.4% capacitance retention after 3000 cycles. To the best of our knowledge, Co-MOFs and Ca-MOFs are used in supercapacitor, and their encouraging properties indicate that Co-/Ca-MOF can be a promising candidate as an advanced electrode material for supercapacitors.

Synthesis of Nickel Oxide Nanoarchitecture Crystals as an Advanced Electrode Material for Supercapacitors

A NiO nanoarchitecture with a chain-like structure material was synthesized using a CTAB-assisted sonochemical method and then applied as an electrode in supercapacitors. Spectral analysis like XRD, FTIR and SEM was used to characterize the crystalline nature, internal structure and morphological properties of NiO nanoarchitecture. At a scan rate of 5 mV s-1, the NiO material exhibits a pseudocapacitive charge storage mechanism and provides a specific capacitance of 562 with good rate capabilities. Moreover, the chain-like NiO material exhibits outstanding cycle stability, retaining 96% of the original capacitance after 3,000 cycles at a scan rate of 100 mV s-1. The high-performance, chain-like nanostructured NiO material is easy to make and is of great interest for improved energy storage devices.

Hierarchical porous nickel tin sulfide nanosheets as a binder free electrode for hybrid supercapacitor

The utilization of free-standing sulfide-based hybrid nanostructures plays a paramount role in supplying the steadily increasing demand for energy storage devices. Herein, this report presents the growth of outstanding binder-free Ni-Sn sulfide thin films for high-performance supercapacitors via the revised successive ionic layer adsorption and reaction (r-SILAR) method. Molar concentration ratios between Ni/Sn have been studied, and the optimum designed mesoporous Nix-Sn1.0xS/Ni foam (NF), a single cathode electrode material, successfully achieved outstanding specific capacitance of 2890 F/g at 5 A/g, capacitance retention of 85 %, and coulombic efficiency of 100 % after 10,000 cycles. Moreover, the constructed Nix-Sn1.0xS/NF//activated carbon (AC) hybrid supercapacitor device delivers an ultrahigh power density of 53.469 KW/Kg and capacitance retention of 95 % with robust long-term cycling stability up to1000 cycles. The superior electrochemical performance of the prepared Nix-Sn1.0xS electrode could be attributed to: (i) the synergistic effect of the two binary metal sulfides (Ni/Sn) into reversible faradaic redox reaction; (ii) the growing mechanism of the ultra-thin film (1.2 nm) as a binder-free electrode, enhance the ions insertion/extraction, and (iii) the formation of hierarchically flower-like architecture with uniform mesopores provides a high surface area (62.2 m2/g) and intensifies active sites for faradaic redox reactions. These encouraging results present a novel avenue for constructing advanced free-standing electrode materials for high-performance supercapacitors.