Electrode Material For High-performance Supercapacitors Research Articles

KCl-assisted synthesis of hierarchically porous carbon materials from water-soluble 2-hydroxyethyl cellulose for high-performance green supercapacitors

Hierarchically porous carbon materials (HPCMs) with large specific surface area (SSA) and interconnected hierarchical pore structures were prepared from 2-hydroxyethyl cellulose (HEC) via eco-friendly ice-templating and KCl-assisted carbonization. Morphological assessments revealed that the HPCMs had sponge-like porous structures with thin carbon sheets and interconnected pores. With increasing amounts of KCl, the SSA and pore volume of the HPCMs increased to 1095.74 m2 g−1 and 1.23 cm3 g−1, respectively. In a three-electrode system, the HPCM-based electrode exhibited a high specific capacitance of 278.09 F g−1 at 1 A g−1 in a 6.0 M KOH electrolyte. In a two-electrode system, a symmetric capacitor device exhibited a high specific capacitance of 67.23 F g−1 at 1 A g−1 with a capacitance retention of ∼80% at 30 A g−1, and an excellent cycling ability of ∼100% after 10,000 cycles at 10 A g−1. Additionally, a symmetric device showed a high-power and high-energy density of 15,000 W kg−1 and 9.34 Wh kg−1, respectively. These results reveal that HPCMs prepared from HEC with KCl can be a potential electrode material for high-performance green supercapacitors.

Construction of high-performance asymmetric supercapacitor based on FeCo-LDH@C3N4 composite electrode material with penetrating structure

The layered structure of layered double hydroxides (LDH) is the key to its use as an electrode material, however, the lack of efficient charge exchange between layered structures severely limits the application of LDH in supercapacitors. In this work, FeCo-LDH was composited with C3N4 by hydrothermal method, and a penetrating structure was built using the layered structure of the two materials. The penetrating structure provides a channel for charge transfer between FeCo-LDH layers and also solves the self-stacking problem of C3N4. The structure of the composites was explored by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscope (TEM), and the results showed that FeCo-LDH composited with C3N4 and formed a penetrating structure. In addition, the electrochemical behavior of the electrode material was evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). Electrochemical test results show that it has a high specific capacity (593 C g−1) at 1 A g−1. Furthermore, in order to study the energy storage properties of the composites, the optimal composites were designed as positive electrode as asymmetric supercapacitors, and the designed asymmetric supercapacitor still has a retention rate of 83.72 % after 10,000 cycles. This attractive performance reveals that FeCo-LDH@C3N4 could as an electrode material for high-performance supercapacitors.

Hierarchical core-shell NiCoSe2@nickel cobalt layered double hydroxide nanocomposite as high-performance electrode materials for asymmetric supercapacitors

As an efficient energy storage device, supercapacitors have exhibited excellent charge storage capacity and stable cycling performance. However, the lower energy density makes it difficult to meet the performance requirements in practical applications. Here, a core-shell structure of NiCoSe2@NiCo-LDH was synthesized on carbon cloth by a two-step method. The NiCoSe2@NiCo-LDH composite as electrode of supercapacitor exhibited a specific capacitance of 2609.1 mF cm−2 (1242.4F g−1) in three-electrode system, which was far higher than that of the NiCoSe2 electrode material, maintaining 85 % of the original capacity after 2000 cycles. The NiCoSe2@NiCo-LDH and activated carbon materials were further assembled to an asymmetric supercapacitor to verify their performance of real applications. The device exhibited a specific capacity of 912.5 mF cm−2 at a current density of 2 mA cm−2 and maintained 96.19 % of its original capacity after 2000 cycles, demonstrating its application potential.

Perylene-Templated Hierarchically Porous Carbon Fibers as Efficient Supercapacitor Electrode Material

Abstract Nitrogen-doped nanoporous carbon fibers were prepared using chromonic perylene bisimide self-assemblies as templates. The method involves the formation of perylene-templated silica followed by carbonization and etching. This strategy does not require any additional carbon or nitrogen precursor and therefore omits the associated impregnation step. The obtained carbon fibers were tested as electrode materials for supercapacitor applications. Owing to the high surface area (695 m2 g−1) and well-developed porosity (pore volume ca. 0.67 cm3 g−1) with hierarchical micro- and mesopore structures, N-doping and high-wettability, amorphous carbon fibers show excellent electrical double-layer capacitance with faradaic pseudocapacitance performance in an aqueous electrolyte solution (1 M H2SO4). A working electrode prepared from the optimal sample achieved a high specific capacitance of 317 F g−1 at a current density of 1 A g−1 with excellent capacitance retention of 80% at a high current density of 50 A g−1 suggesting a fast electrolyte ion diffusion at the electrode surface. The electrode also showed outstanding cycle stability of 99% after 10,000 successive charge-discharge cycles. These results show the high potential of chromonic-derived hierarchically porous carbon fibers as electrode materials for high-performance supercapacitors with advantages over electrospinning and catalytic fabrication methods, such as the absence of heavy metals and organic solvents in the preparation procedure.

A novel composite based on NiCo2O4@NG/MnOOH nanorods for high-performance supercapacitor electrodes

For attaining an enhanced supercapacitor performance, electrode materials enriched with high conductivity, large surface area, rational porous structure, and high capacitance are desirable. Composites based on ternary transition metal oxides enriched with nitrogen-doped graphene are considered novel materials for supercapacitor electrodes. Herein, the composite of nitrogen-doped graphene with NiCo2O4 and MnOOH (abbreviated as NCO-NtG-MOOH) is synthesized through the facile three-step hydrothermal method for the first time and investigated for its chemical composition, morphology, and electrochemical properties. The as-synthesized NCO-NtG-MOOH ternary composite showed remarkable battery-type capacitive behavior owing to the multiple oxidation states, 1D rods-like morphology, inherent porosity, conductivity offered by nitrogen-doped graphene, and synergetic contribution of each component of the composite. For comparison, composite based on binary metal oxide NiCo2O4@Nitrogen-doped graphene (abbreviated as NCO-NtG) is synthesized through the same hydrothermal method. The results specified that NCO-NtG-MOOH composite-based electrode outperformed the NCO-NtG with a specific capacitance delivery of 525.72 Fg−1 at a current density of 1 Ag−1, and cyclic stability of 94.99 % over 2000 continuous charge-discharge cycles. A symmetric coin cell supercapacitor device fabricated using the NCO-NtG-MOOH electrode delivered remarkable electrochemical performance, including a specific capacitance of 42.9 Fg−1 at 0.25 Ag−1, working voltage window of 0–1.2 V, an energy density of 7.2 Wh kg−1 at a power density of 548.72 W kg−1, and capacitance retention of 88 % after 2000 cycles. Thus, indicating the prospective usage of NCO-NtG-MOOH as a high-performance supercapacitor electrode material.

Carbon-Encased Mixed-Metal Selenide Rooted with Carbon Nanotubes for High-Performance Hybrid Supercapacitors.

Transition metal-based compounds with high theoretical capacitance and low cost represent one class of promising electrode materials for high-performance supercapacitors. However, their low intrinsic electrical conductivity impedes their capacitive effect and further limits their practical application. Rational regulation of their composition and structure is, therefore, necessary to achieve a high electrode performance. Herein, a well-designed carbon-encased mixed-metal selenide rooted with carbon nanotubes (Ni-Co-Se@C-CNT) was derived from nickel-cobalt bimetallic organic frameworks. Due to the unique porous structure, the synergistic effect of bimetal selenides and the in situ growth of carbon nanotubes, the composite exhibits good electrical conductivity, high structural stability and abundant redox active sites. Benefitting from these merits, the Ni-Co-Se@C-CNT exhibited a high specific capacity of 554.1 C g-1 (1108.2 F g-1) at 1 A g-1 and a superior cycling performance, i.e., 96.4% of the initial capacity was retained after 5000 cycles at 10 A g-1. Furthermore, a hybrid supercapacitor assembled with Ni-Co-Se@C-CNT cathode and activated carbon (AC) anode shows a superior energy density of 38.2 Wh kg-1 at 1602.1 W kg-1.

Coupling of chrysanthemum-shaped cobalt hydroxide and nitrogen-doped carbon dots for high-performance hybrid supercapacitors

• Due to the negative potential of NQDS, it can generate electrostatic reaction with Co 2+ . NQDs directed Co(OH) 2 growth, the amount of NQDs determines the density of rod-shaped cobalt hydroxide. • Fabrication of Cobalt hydroxide/N doped graphene quantum dots (Co(OH) 2 /NQDs) composites with chrysanthemum-shaped by an in-situ reaction. • the strong coupling between NQDs and Co(OH) 2 creates new electron transfer channels (Co-N), the Co(OH) 2 /NQDs composites delivers enhanced specific capacitance of about 593 F g −1 at 1 A/g. • The hybrid supercapacitor device based on Co(OH) 2 /NQDs composite and graphene aerogel exhibits a high energy density of about 33 Wh kg −1 at power density of 800 Wkg −1 and it retain about 137% specific capacitances after 8000 cycle test. NQDs can stabilize cobalt hydroxide after long cycles. Cobalt hydroxide is expecting electrode material for high-performance supercapacitors, however, it is still a challenge to improve its lack of transmission track and active sites. An effective method to improve the electrochemistry performance of cobalt hydroxide is to couple it with graphene quantum dots. Herein, we report the preparation of Cobalt hydroxide/N doped graphene quantum dots (Co(OH) 2 /NQDs) composites and study the electrochemistry performance of Co(OH)2/NQDs composites as supercapacitors electrode materials. Benefit from the strong coupling between NQDs and Co(OH) 2 creates new electron transfer channels (Co-N). The hybrid supercapacitor device based on Co(OH) 2 /NQDs composite and GA shows a high energy density of about 33.6 Wh kg −1 at a power density of 800 Wk g −1 , and it retains about 137% specific capacitances after 8000 cycle test. Due to the negative potential of NQDS, it can generate an electrostatic reaction with Co 2+ , which can stabilize cobalt hydroxide after long cycles.

One-step chemical activation facilitates synthesis of activated carbons from Acer truncatum seed shells for premium capacitor electrodes

Activated carbons were produced from Acer truncatum seed shells with KOH activation in one step (direct activation) or two steps (activation preceded with carbonization). The effects of activation mode and temperature on the surface/physicochemical properties and electrochemical characteristics of the resulting activated carbons were thoroughly investigated. One-step activation at 800 °C outperformed other operating conditions and the resulting activated carbon (OAAS-800) featured a large surface area of 2210.7 m 2 g –1 and a total pore volume of 1.23 cm 3 g −1 . The OAAS-800 based capacitor delivers a high specific capacitance of 361 F g −1 at 0.5 A g −1 in a 6 mol L −1 KOH electrolyte, 82% capacitance retention after increasing current density from 0.5 to 20 A g –1 , and excellent cycle stability (98.6% capacitance retention after 10,000 cycles). The OAAS-800-based symmetric supercapacitor could offer a superior energy density of 27.78 W h kg –1 at 250 W kg –1 power density. The excellent performance was attributed to an interconnected three-dimensional porous structure. The simple yet very effective one-step activation opens up a new avenue for the production of high-performance supercapacitor electrode materials from low-cost oilseed plant residues . • One-step and two-step KOH activation of Acer truncatum seed shells are compared. • One-step activation at 800 °C develops activated carbons with excellent porosity. • OAAS-based capacitor presents a high capacitance of 361 F g −1 at 0.5 A g −1 . • OAAS-based capacitor retains 98.6% of capacitance after 10,000 cycles at 200 mV s −1 . • OAAS-based capacitor has a high energy density of 27.78 W h kg –1 at 0.25 kW kg –1 .

One-Step Hydrothermal Synthesis of MoO2/MoS2 Nanocomposites as High-Performance Electrode Material for Supercapacitors.

By only changing the ratio of Mo to S source, a distinctive single phase MoO2 or MoS2 and MoO2/MoS2 nanocomposites (NCs) are obtained through a simple one-step hydrothermal method based on CH4N2S as a sulfur source and (NH4)6Mo7O24·4H2O as a source of Mo in oxalic acid. The effect of ratio of Mo to S source on the composition, structure, and electrochemical performance are systematically researched. Due to its unique design, abundant macropores active sites in MoO2/MoS2 NCs induce superior rate property (55.30% capacitance retention to 20 from 1 A g-1) and larger specific capacitance (1667.3 F g-1 at 1 A g-1) and longer cycle life (94.75% after 5000 cycles) as used directly as an electrode. Furthermore, at a power density of 225 W kg-1, a maximal energy density of 21.85 Wh kg-1 is provided by the asymmetric supercapacitor (MoO2/MoS2//AC). The capacitance of asymmetric supercapacitor (ASC) is remarkably enhanced by 129.02% under 5000 cycles at a current density of 1.5 A g-1, demonstrating outstanding cycle property. These results imply the prepared MoO2/MoS2 NCs have promising applications in advanced energy storages. It is important and should be noted that NCs of oxide and sulfide are prepared with only a simple one-step process.

Molybdenum and sulfur co-doped CoNiO2 with tremella-like nano-structures as electrode material for high-performance supercapacitors

Heteroatomic doping has a significant effect on improving the electrochemical energy storage of metal oxide electrode materials and has been applied in the field of supercapacitors. However, there are few reports on the co-doping of anions and cations into transition metal oxides as the electrode materials in supercapacitors. Herein, the Mo, S co-doped CoNiO2 electrode material with tremella-like nano-structures was successfully prepared on nickel foam (denoted as NiCoMoO-S@NF) via two-step hydrothermal procedures and UV-light irradiation. The co-doping of Mo and S gives the CoNiO2 material a higher specific surface area of 113.98 m2 g−1, abundant active site, and improved electrical conductivity. The obtained NiCoMoO-S@NF shows a high specific capacity of 999.1C g−1 at a current density of 1 A g−1. Moreover, the hybrid supercapacitor device assembled by NiCoMoO-S@NF and rGO@NF can obtain a great energy density of 38.8 Wh kg−1 at a power density of 2880 W kg−1 and shows good cycling stability of 71.6 % capacity retention after 6500 cycles, indicating the excellent supercapacitive properties of NiCoMoO-S@NF and its potential application in supercapacitors.

Silver doped NiAl2O4 nanoplates anchored onto the 2D graphitic carbon nitride sheets for high-performance supercapacitor applications

In the current study, NiAl2O4, and silver doped NiAl2O4 were synthesized via a sol-gel approach and their composite with g-C3N4 was successfully prepared via an ultrasonication approach. The characterization of as fabricated materials was carried out via various conventional techniques. Furthermore, the electrochemical behavior of the as-fabricated electrode materials was investigated via various electrochemical techniques. The results of electrochemical measurements were analyzed for all three prepared electrodes and Ag-NiAl2O4@g-C3N4 nanocomposite was found to be a more active electrode material than other prepared electrodes. Ag-NiAl2O4 @g-C3N4 showed specific capacitance of 768 Fg−1, 94.01% capacitance retention after 6000 CV cycles, 519 s discharge time, 0.51 Ω charge transfer resistance, 27 WhKg−1, and 187.28 WKg−1 energy and power densities respectively. Ag-NiAl2O4@g-C3N4 can be considered a potential and propitious electrode material for high-performance supercapacitors.

Robust Bioinspired MXene-Hemicellulose Composite Films with Excellent Electrical Conductivity for Multifunctional Electrode Applications.

MXene-based structural materials with high mechanical robustness and excellent electrical conductivity are highly desirable for multifunctional applications. The incorporation of macromolecular polymers has been verified to be beneficial to alleviate the mechanical brittleness of pristine MXene films. However, the intercalation of a large amount of insulating macromolecules inevitably compromises their electrical conductivity. Inspired by wood, short-chained hemicellulose (xylo-oligosaccharide) acts as a molecular binder to bind adjacent MXene nanosheets together; this work shows that this can significantly enhance the mechanical properties without introducing a large number of insulating phases. As a result, MXene-hemicellulose films can integrate a high electrical conductivity (64,300 S m-1) and a high mechanical strength (125 MPa) simultaneously, making them capable of being high-performance electrode materials for supercapacitors and humidity sensors. This work proposes an alternative method to manufacture robust MXene-based structural materials for multifunctional applications.

The phenomenon of increasing capacitance induced by 1T/2H-MoS2 surface modification with Pt particles – Influence on composition and energy storage mechanism

In this paper, several approaches to the synthesis of molybdenum-based electrode materials for supercapacitors are presented, including anodization, hydrothermal process and annealing. For the material prepared via anodization of a molybdenum plate, followed by a hydrothermal process in thiourea aqueous solution, a thorough study of the Pt-surface modification through repetitive cycling in 1 M sulfuric acid with Pt acting as a counter electrode is performed, including X-ray photoelectron spectroscopy analysis and energy storage mechanism contribution. Along with the increasing number of cycles, an increase of the capacitance value is observed up to 1.064 F cm −2 after 60 000 cycles, resulting in more than tenfold growth (by over 1 150%). The analysis reveals progressive changes in the electrode material's chemical composition and the increasing pseudocapacitance contribution in energy storage processes, which is strictly caused by the formation of mixed molybdenum oxides with oxygen vacancies. Thus, Pt-surface modification effectively improves the electrochemical performance of the electrode material with excellent coulombic efficiency and capacitance retention. In a symmetric two-electrode configuration with Pt-modified electrode materials, the areal capacitance of 140.5 mF cm −2 is obtained after 50 000 cycles (with capacitance retention of 123%) indicating that Pt-surface modification of MoS 2 may provide a novel approach for electrode materials for high-performance supercapacitors.

Nickel(II) Cluster-Based Pillar-Layered Metal-Organic Frameworks for High-Performance Supercapacitors.

Most metal-organic frameworks (MOFs) cannot be used as electrode materials for supercapacitors because of their high costs, poor stabilities in aqueous solutions, inferior intrinsic electrocatalytic activities, and poor conductivities. Herein, the application of two nickel(II) cluster-based pillar-layered MOFs, Ni-mba-Na ([Ni8(mba)6(Cl)2Na(OH-)3]n, H2mba is 2-mercaptobenzoic acid) and Ni-mba-K ([Ni8(mba)6(Cl)2K(OH-)3]n), as electrode materials are reported. They differ from conductive MOFs because they are insulators with small specific surface areas (<10 m2 g-1), and H2mba is an inexpensive raw material. The conductivities of Ni-mba-Na and Ni-mba-K at 30 °C were 4.002 × 10-10 and >10-11 S cm-1, respectively. They showed excellent supercapacitor performance and stabilities and high inherent densities and specific capacitances. The specific powers of their asymmetric supercapacitors could reach up to 16,000 W kg-1; the specific energies of Ni-mba-Na and Ni-mba-K were 16.9 and 21.8 Wh kg-1, respectively. Design recommendations for these MOFs are provided based on their structure and performance differences. This paper shows a novel application of nonconductive MOFs in the energy storage field and design of high-performance electrode materials for supercapacitors.

Fast assembling MnO2-network electrode materials to achieve high performance asymmetric aqueous supercapacitors

Manganese dioxide (MnO2) is a promising supercapacitive material due to the advantages of low cost, natural abundance and friendly environment. Nevertheless, it generally presents an unsatisfactory supercapacitive performance due to the poor utilization rate in the charge/discharge process and the sluggish charge (electrons/ions) transfer kinetics. Constructing a 3D MnO2 network is a promising way to solve the above problems, but usually suffers from a prolonged reaction time or a high-heating source that makes them unfavorable for practical applications. Here, we developed a one-pot, fast and cost-effective method to assemble 3D MnO2 network electrode materials within 10 min. The MnO2-network materials present a high utilization rate and a fast charge transfer capability. As an aqueous supercapacitor electrode, it exhibited a high specific capacitance of 382 F g−1 at 1 A g−1 and ranked among the intrinsic MnO2 materials at the top level. The corresponding asymmetric supercapacitor coupled with activated carbon delivered a high energy density of 44 Wh kg−1 at a power density of 277 W kg−1 and maintains 91.2 % capacitance retention after 10,000 cycles at 10 A g−1. This work paves the way for simple, environmental-friendly, and rapid methods to gain the high-performance MnO2 electrode materials for supercapacitors.

One-Step Regulatory Synthesis of Quaternary Transition Metal Sulfide Cu2MnSnS4 as Electrode Material for High-Performance Supercapacitors

One-Step Regulatory Synthesis of Quaternary Transition Metal Sulfide Cu2MnSnS4 as Electrode Material for High-Performance Supercapacitors

Nanorod NiMoO4@NiCo2S4 as an advanced electrode material for high-performance supercapacitors

Nickel-cobalt sulfides exhibit good energy storage properties, but the poor stability affects the application of the material. In this work, we designed a simple route to synthesize NiMoO4 @NiCo2S4 composites by hydrothermal method combined with electrodeposition. The highly conductive NiCo2S4 nanorods and the highly reactive NiMoO4 showed good synergistic effects. NiMoO4 @NiCo2S4 exhibiting a high specific capacity of 1282.6 C g−1 (2565.2 F g−1) at 2 A g−1. The capacity retention of NiMoO4 @NiCo2S4 is increased from 75.93% to 84.7% after 5000 charge-discharge cycles compared with NiCo2S4 electrode. Further density functional theory (DFT) calculations show that the density of states (DOS) near the Fermi level of NiMoO4 @NiCo2S4 is significantly increased and the work function (WF) increases to 5.13 eV, which improves the electrochemical performance of the material. In addition, the NiMoO4 @NiCo2S4//Activated carbon asymmetric supercapacitor exhibits a high energy density of 75.3 Wh kg−1 at 800 W kg−1.

Amorphous S-doped NixCo3-xO4 for high-performance asymmetric supercapacitors

Amorphous S-doped NixCo3-xO4 materials were successfully synthesized using a facile co-precipitation method through changing additive in a mixed solution. As-prepared amorphous S-doped NixCo3-xO4 exhibit different Ni/Co ratio, O/S ratio, morphology and structure when a mixed solution including sodium dodecyl sulfate, without additive, or containing glycine. S-doped NixCo3-xO4 prepared with a mixed solution excluding additive (denoted as NixCo3-xO4-ySy-2) exhibits remarkable supercapacitive performance due to optimum Ni/Co ratio, minimum O/S ratio, proper morphology and structure. NixCo3-xO4-ySy-2 delivers a specific capacitance of 1335 F g−1 at 0.5 A g−1 and a ultra-high specific capacitance retention of 68.7% even at 16 A g−1, demonstrating high specific capacitance and good rate capability. Moreover, NixCo3-xO4-ySy-2 shows an initial specific capacitance retention of 80.8% after 2000 cycles, implying superior cycling stability. The assembled asymmetric supercapacitor (ASC) based on NixCo3-xO4-ySy-2 as the positive electrode and AC as the negative electrode achieves outstanding energy density of 31.87 Wh kg−1 at a power density of 900 W kg−1. The specific capacitance retention of the ASC is up to 90.2% after 2000 cycles, exhibiting excellent cycling stability. This study shows a promising electrode for supercapacitors device and provides an effective strategy for design of high-performance supercapacitor electrode materials.

Fabrication of novel coral reef-like nanostructured ZnFeNiCo2S4 on Ni foam as an electrode material for battery-type supercapacitors

Battery-type electrode materials have recently been explored as a novel class of high-capacity cathode materials in the development of hybrid supercapacitors. In the study, a novel nano coral-reef ZnFeNiCo2S4 quaternary sulfide was synthesized in two easy hydrothermal stages on a Ni Foam (NF) substrate for advanced battery-type supercapacitors. In three or two electrode systems, the ZnFeNiCo2S4/NF was applied as a potential electrode for battery-type supercapacitors. According to the result, the ZnFeNiCo2S4/NF electrode was successfully synthesized as a binder-free electrode on the Ni foam. The electrochemical investigation of the ZnFeNiCo2S4/NF showed a high specific capacity of 1778 C g−1 at a current density of 3 A g−1 with excellent cycling stability of 86.1% capacity retention and 100% coulombic efficiency at 6 M KOH as the electrolyte. The battery-type symmetric supercapacitor measured a specific capacitance of 162.3 C g−1 at a current density of 2 A g−1 with a specific energy of 33.8 Wh kg−1 at a specific power of 2519.25 W kg−1. On the contrary, asymmetric supercapacitors exhibit excellent cycling stability, approximately 94.7% capacity retention after 6000 cycles, and a 100% coulombic efficiency. Due to their excellent electrochemical characteristics, the high-performance ZnFeNiCo2S4 nano coral reef-like structure is a promising electrode material for high-performance supercapacitors.

Synthesis of copper/chromium metal organic frameworks - Derivatives as an advanced electrode material for high-performance supercapacitors

Highly optimized copper chromium mixed oxides, derived from mixed cupper/chromium metal organic frameworks (Cu/Cr-MOF), have been successfully synthesized by calcination of parent chromium metal organic frameworks (Cr-MIL-101), cupper metal organic frameworks (Cu-BDC), and mixed Cu/Cr-MOFs in air. The as-synthesized MOF derivatives (CuxCr(1-x)-MOF-D) were characterized using nitrogen adsorption desorption isotherms (BET), SEM, EDX, TEM, XRD, XPS, SEM-elemental mapping, FT-IR, DSC and TGA analysis. XRD displayed that only one crystalline phase resulted for copper and chromium which is CuO and Cr2O3, respectively. The prepared MOF derivatives (MOF-D) displayed a regular octahedral morphology in case of Cr-MOF-D, which is changed to distorted octahedral structure after the addition of copper in the same frameworks, as confirmed by TEM and SEM techniques. Cu/Cr-MOF-D displayed exceptional electrochemical behavior for Cu0.50Cr0.50-MOF-D electrode with specific capacitance of 535.1 F. g−1 at 0.7 A. g−1 within potential window (ΔV) of 1.04 V. Also, it generated high power and energy density of 2600 W kg−1 and 36.7 W h kg−1, respectively. Cu0.50Cr0.50-MOF-D electrode has excellent cycling stability, that retained 90.3% of its initial specific capacitance even after 5000 cycles compared to the capacitance retention of Cu-MOF-D and Cr-MOF-D electrodes that reached 70.26% and 69.17%, respectively.