Preparation Of Electrode Materials Research Articles

Hierarchical nanostructured Co0.5Mn0.5WO4 efficient electrode material for asymmetric supercapacitor application

BackgroundThis research focuses on the electrochemical characteristics of binary metal tungstates for asymmetric supercapacitor applications. Metal tungstates such as Cobalt tungstate (CoWO4) and Manganese tungstate (MnWO4) exhibit excellent electrical conductivity and redox characteristics. Different combinations of binary metal tungstates can serve as effective electrode materials for supercapacitor applications. MethodHerein, Co0.5Mn0.5WO4 nanoparticles was synthesized by the co-precipitation method followed by calcination. The prepared nanoparticles was used as an electrode material for the supercapacitor application. For study the two electrode system, Co0.5Mn0.5WO4 and activated carbon were worked as anode and cathode electrode, respectively. Significant findingsThe prepared electrode materials exhibit a battery type pusudocapacitance in cyclic voltammetry (CV). The charging and discharging properties of the material was analysed by galvanic charging and discharging (GCD) studies and it displays the specific capacitance value of 444 F/g at the current density of 1 A/g and it shows the specific capacitance retention of 91% after 1500 cycles. AC//Co0.5Mn0.5WO4 ASC device shows good energy density, power density and specific capacitance values of 30.5 Wh/Kg, 2800 W/Kg and 112 F/g at 1 A/g current density, respectively.

Dynamic Adaptive Porous Cu Current Collector for Low N/P Ratio Li Metal Batteries

Porous copper (Cu) current collectors effectively suppress the growth of lithium (Li) dendrites and enhance the stability of Li metal anodes. However, the current development of porous Cu hosts generally involves a high proportion of Cu, mostly rigid structures, small pore volumes, and low Li utilization. Here, we propose a dynamic adaptive porous Cu (DAP‐Cu) host, which is lightweight with a high pore volume, fabricated using a large aspect ratio of Cu nanowires as the building blocks. This DAP‐Cu allows for the precise loading of metallic Li, and the symmetric battery assembled with Li/DAP‐Cu electrode operates at the high current density of 5 mA cm‐2 for 4000 hours while exhibiting a low polarization voltage of ~60 mV. The Li/DAP‐Cu anode achieves high‐performance compatibility with LiFePO4 and sulfur cathodes, with optimal N/P ratios of 1.20:1 and 4.0:1, respectively. Full and pouch cells with low N/P ratios exhibit exceptionally high specific capacities and long‐term cycling life. The establishment of standards for the matching of anodes and cathodes provides a reference for the quantitative preparation of electrode materials and is of significant guidance for enhancing the efficient utilization of metallic Li.

Supercapacitor Performance of Sulfonyldibenzene Derivative-Functionalized Graphene Aerogel.

3D aerogels incorporating functionalized reduced graphene oxide (SUL/rGO) were prepared as a hydrothermal method utilizing graphene oxide (GO) and a sulfonyldibenzene derivative (SUL) as raw materials. The aromatic compound SUL, which contains hydroxyl and sulfonyl groups, was bonded to reduced graphene oxide (rGO) through π-π connections. The obtained composite material exhibited porosity within its structure with improved hydrophilicity, along with excellent electrochemical characteristics. This improvement was ascribed to the specific rGO structure, as well as the pseudocapacitance inherent in SUL, both of which synergistically contribute to improvement in the characteristics of the prepared electrode materials. Also, an analysis was performed employing density functional theory from which the density of states and adsorption energy of SUL on the surface of rGO were computed to further investigate the charge storage process within the prepared composite. The prepared SUL/rGO-2 electrode exhibited the highest specific capacitance value of 388 F/g at a current density equal to 1 A/g. The constructed symmetrical supercapacitor, SUL/rGO-2//SUL/rGO-2, attained an energy density value of 14.55 Wh/kg at a power density equal to 350 W/kg with an exceptional galvanostatic charge-discharge (GCD) cyclic stability equal to 91% following 10 000 cycles. Therefore, this review presents a novel functionalized graphene-based material incorporating hydroxyl and sulfonyl groups, which holds promise in future energy storage applications.

Microbial synthesis of antimony sulfide to prepare catechol and hydroquinone electrochemical sensor by pyrolysis and carbonization

The application of antimony sulfide sensors, characterized by their exceptional stability and selectivity, is of emerging interest in detection research, and the integration of graphitized carbon materials is expected to further enhance their electrochemical performance. This study represents a pioneering effort in the synthesis of carbon-doped antimony sulfide materials through the pyrolysis of the mixture of microorganisms and their synthetic antimony sulfide. The prepared materials are subsequently applied to electrochemical sensors for monitoring the highly toxic compounds catechol (CC) and hydroquinone (HQ) in the environment. Via cyclic voltammetry (CV) and impedance testing, we concluded that the pyrolytic product at 700 °C (Sb-700) demonstrated the best electrochemical properties. Differential pulse voltammetry (DPV) revealed impressive separation when utilizing Sb-700/GCE for simultaneous detection of CC and HQ, exhibiting good linearity within the concentration range of 0.1–140 μM. The achieved sensitivities of 24.62 μA μM−1 cm−2 and 22.10 μA μM−1 cm−2 surpassed those of most CC and HQ electrochemical sensors. Meanwhile, the detection limits for CC and HQ were as low as 0.18 μM and 0.16 μM (S/N = 3), respectively. Additional tests confirmed the good selectivity, reproducibility, and long-term stability of Sb-700/GCE, which was effective in detecting CC and HQ in tap water and river water, with recovery rates of 100.7%–104.5% and 96.5%–101.4%, respectively. It provides a method that combines green microbial synthesis and simple pyrolysis for the preparation of electrode materials in CC and HQ electrochemical sensors, and also offers a new perspective for the application of microbial synthesized materials.

Enhancement in photocatalytic and electrochemical performance of hydrothermally synthesized β-Bi2O3 via Ni incorporation

β-Bi2O3 and Ni-incorporated β-Bi2O3 nanoparticles with different Ni incorporating amounts (0, 2, and 4 at. wt. %) were successfully synthesized through a viable hydrothermal process. As-synthesized nanoparticles were analyzed by complementary analytical tools such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), UV–visible spectroscopy (UV–Vis), and photoluminescence spectroscopy (PL) for structural, microstructural, compositional, and spectral properties. The photocatalytic performance of synthesized nanoparticles was assessed by subjecting them to visible light irradiation and monitoring the decomposition of rhodamine-B dye. The findings demonstrated that the inclusion of Ni(4%) in β-Bi2O3 nanoparticles significantly enhanced its photocatalytic activity compared to pristine β-Bi2O3 which is desirable for environmental remediation. This improvement may be caused by increased generation of electron-hole (e−-h+) pairs, reduced recombination rate of these pairs, enhanced absorption of visible light, and a decreased band gap energy. To evaluate the specific capacitance characteristics of synthesized electrode materials, cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance analyses were conducted. The super capacitance activities of prepared electrode materials were observed in the order of Bi2O3 < Ni(2%)-Bi2O3 < Ni(4%)-Bi2O3. Notably, Ni(4%)-Bi2O3 nanocomposite exhibited higher supercapacitance, which can be attributed to the effective role of appropriate nickel incorporation in Bi2O3. These results suggested that the incorporation of Ni(4%) into β-Bi2O3 to form a nanocomposite showed greater capability as an effective electrode material for advanced energy storage devices, especially supercapacitors.

High-performance Zn-ion hybrid supercapacitors based on biomass-derived hierarchical porous carbon through template-activated bifunctional induced and ice-crystal assisted strategy

As a highly desirable cathode material for Zn ion hybrid supercapacitors (ZHSCs), biomass-derived carbon precursor shrinks and collapses at elevated temperatures resulting in an impeded internal morphology, which severely hampers ion storage and transport. Herein, a unique porous carbon with multi-level pore structures is produced by a one-step carbonization-activation process. The Gelatin with rich functional groups is employed as the gel-state biomass precursor and the ZnCl2 acted as both a template and an activator. Furthermore, the growth of ice crystals during freeze-drying prevents the carbon framework from collapsing and self-polymerizing of ZnCl2, endowing the prepared porous carbon with a high specific surface area (1336 m2/g) and inheritance of biomass precursor heteroatoms (including N and O). Therefore, at 0.5 A/g, the prepared material displays a desirable specific capacitance of 337.6 F/g in 6 M KOH. In particular, the assembled ZHSC simultaneously shows excellent cycling performance (after 10000 cycles, the specific capacitance increases to 95.6% at 10 A/g) and high energy and power density (120.1 Wh/kg at 450 W/kg). This work provides important insights for the facile preparation of electrode materials for high-performance ZHSCs.

Porous Zinc Oxide and Functionalized Multiwalled Carbon Nanotubes Composite as Electrode Material for Enhanced Electrochemical Sensing of an Anticancer Drug, Dasatinib

An anticancer drug, dasatinib (DAS), is used to treat prostate cancer, chronic myelogenous leukaemia, and acute lymphoblastic leukaemia. In the present work, we describe the preparation of zinc oxide (ZnO) nanoparticles (NPs) using Averrhoa bilimbi leaf extract. These ZnO NPs were combined with functionalized multi-walled carbon nanotubes (f-MWCNT) to prepare a ZnO@f-MWCNT nanocomposite for electrochemical sensing of DAS. The prepared electrode materials, ZnO NPs, f-MWCNT, and ZnO@f-MWCNT, were characterised by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), the Fourier-transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), zeta potential, and the dynamic light scattering (DLS) techniques. DAS exhibited a significant enhancement (18-fold) in the oxidation peak current at ZnO@f-MWCNT, 10-fold at f-MWCNT, and 6-fold at ZnO NPs as compared to that at bare GCE. Under optimised conditions, a linear relationship was noticed among the peak current and concentration of DAS in the range of 0.03–82.65 μM and 0.01–122.45 μM for the differential pulse voltammetric (DPV), and square wave voltammetric (SWV) methods, respectively. Further, the applicability of the proposed sensor was demonstrated by analysing pharmaceutical and biological samples containing DAS. Higher percentage recovery values, and lower relative standard deviation (RSD) values highlighted the accuracy and precision proposed electrochemical methods.

Enhanced electrochemical activity of chemically engineered rGO-decorated NiO/CoFe2O4 for supercapacitor applications

Carbon-based materials have a broad range of applications. Among various carbon-based materials, reduced graphene oxide (rGO) is one of the facile options for supercapacitor (SCs) fabrication. The main reason is that it offers excellent conductance and enhanced surface redox reactivity. Therefore, there is a significant possibility that this material will boost the electrochemical efficiency of pseudocapacitive materials based on transition metals. Using the sonication route, we have synthesized NiO/CoFe2O4 composite and decorated it with rGO. After structural and morphological analysis, the prepared electrode materials were subjected to electrochemical energy storage efficiency studies. The obtained data showed that the NiO/CoFe2O4@rGO exhibited a higher specific capacitance of 911.25 Fg-1 as compared to other electrode materials (such as NiO/CoFe2O4, NiO, and CoFe2O4). Moreover, it was observed that NiO/CoFe2O4@rGO has low equivalence series resistance (ESR) as 0.29 Ω, in comparison to NiO/CoFe2O4, NiO, and CoFe2O4. The enhanced conductivity of rGO and the good crystallinity of NiO and CoFe2O4 are responsible for the excellent efficiency of the NiO/CoFe2O4@rGO electrode material. According to the obtained results, the NiO/CoFe2O4@rGO nanocomposite is an effective capacitive material for supercapacitors fabrication.

Energy Storage Performance of Electrode Materials Derived from Manganese Metal-Organic Frameworks.

Metal-organic frameworks (MOFs) are porous materials assembled using metal and organic linkers, showing a high specific surface area and a tunable pore size. Large portions of metal open sites in MOFs can be exposed to electrolyte ions, meaning they have high potential to be used as electrode materials in energy storage devices such as supercapacitors. Also, they can be easily converted into porous metal oxides by heat treatment. In this study, we obtained high energy storage performance by preparing electrode materials through applying heat treatment to manganese MOFs (Mn-MOFs) under air. The chemical and structural properties of synthesized and thermally treated Mn-MOFs were measured by Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The surface area and porosity were investigated by nitrogen adsorption/desorption isotherms. The electrochemical properties were studied by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) using a three-electrode cell. It was found that Mn-MOF electrodes that underwent heat treatment at 400 °C under air consisted of Mn2O3 with high specific surface area and porosity. They also showed a superior specific capacitance of 214.0 F g-1 and an energy density value of 29.7 Wh kg-1 (at 0.1 A g-1) compared to non-treated Mn-MOFs.

Electrostatic Self‐Assembly Heterostructured MXenes/ Wasted PET‐Derived Carbon for Superior Capacitive Energy Storage

AbstractCarbon materials have become a focal point in supercapacitors (SCs) due to their perfect charge–discharge behavior, relatively low cost, and excellent electrochemical stability, but the limited electrochemical activity restricts their further development. MXenes (Ti3C2Tx) combine high electrical conductivity, hydrophilicity, and abundance surface functional groups, which contribute to high energy density when compounded with carbon materials. In this work, carbon material derived from mineral water bottles is modified with cetyltrimethylammonium bromide (CTAB) that spontaneously forms into porous heterogeneous structures with Ti3C2Tx under electrostatic interactions. The carbon material hinders the reaggregation of Ti3C2Tx, while Ti3C2Tx increases the electrochemical activity on the surface of the carbon material. A hierarchical porous carbon with a large specific surface area of 1754.3 m2 g−1, promoting the electrolyte migration kinetics and high specific capacitance in 6 m KOH electrolyte (404.1 F g−1 at 1 A g−1). The symmetric SC made as‐prepared carbon electrode shows an extended voltage window (1.8 V), an optimal energy density (31.19 Wh kg−1 at a power density of 450 W kg−1) and a low capacitance decay (1% after 15 000 cycles) in 1.5 m Na2SO4. The preparation of electrode material with a unique structure provides a practical and innovative strategy for the value‐added utilization of waste plastics.

Progress of Electrocatalytic Technology in Treating Organic Chemical Wastewater

In recent years, extensive research has been conducted on the preparation of high catalytic performance electrodes and the development of electrocatalytic water treatment processes. This article introduces the basic principles of electrochemical water treatment, the preparation of electrode materials, and the research progress of electrocatalytic technology for degrading organic chemical wastewater. It analyzes the problems faced by electrocatalytic degradation of organic chemical wastewater and looks forward to the development trend of electrocatalytic technology in the field of organic chemical wastewater treatment.

Utilizing waste pomelo peel to develop activated-doped porous biomass carbon as electrode materials: Study of activation mechanism, evaluation of electrochemical properties and assembly of symmetric supercapacitors

To prepare electrode materials with excellent comprehensive properties for supercapacitor applications, and to promote the reuse of waste fruit peels. This work used waste pomelo peel as a carbon source for high-temperature carbonization, and a series of porous biomass carbon materials (YB-K) was prepared using a combination of freeze-drying and activation pore-making. The relationship between the structure of YB-K materials and the amount of activator was investigated by characterization. The results show that the YB-K materials (YB-K5) with the mass ratio of raw materials to activator of 1:5 have the best overall properties, and their specific surface area is as high as 1277.14 m2/g. Notably, the YB-K5 materials can be doped with nitrogen to prepare electrode materials (YB-K5-N) with excellent electrochemical properties. The specific capacitance of YB-K5-N electrode materials reaches 247.26 F/g at 0.5 A/g current density. Importantly, the YB-K5-N symmetric (button type) supercapacitor assembled with YB-K5-N materials showed good cycling stability with 87.58% specific capacitance retention after 3000 cycles. The YB-K5-N electrode materials prepared in this work have potential applications in energy conversion, energy storage and electrochemistry, which provide a new idea for utilizing waste fruit peels.

Asymmetric Supercapacitors based on 1,10-phenanthroline-5,6-dione Molecular Electrodes Paired with MXene.

An efficient approach to increase the energy density of supercapacitors is to prepare electrode materials with larger specific capacitance and increase the potential difference between the positive and negative electrodes in the device. Herein, an organic molecular electrode (OME) is prepared by anchoring 1,10-phenanthroline-5,6-dione (PD), which possesses two pyridine rings and an electron-deficient conjugated system, onto reduced graphene oxide (rGO). Because of the electron-deficient conjugated structure of PD molecule, PD/rGOs exhibit a more positive redox peak potential along with the advantages of high capacitance-controlled behaviour and fast reaction kinetics. Additionally, the small energy gap between the lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) leads to increased conductivity in PD/rGO. To assemble the asymmetric supercapacitor (ASC), a two-dimensional metal carbide, as known as MXene, with a chemical composition of Ti3C2Tx is selected as the negative electrode due to its exceptional performance, and PD/rGO-0.5 is employed as the positive electrode. Consequently, the working voltage is expanded up to 1.8 V. Through further electrochemical measurements, the assembled ASC (PD/rGO-0.5//Ti3C2Tx) achieves a remarkable energy density of 36.8 Wh kg-1. Remarkably, connecting two ASCs in series can power 73 LEDs, showcasing its promising potential for energy storage applications.

Enhanced electrochemical behavior of naturally derived Eu3+: PEG/CaCO3 nanocomposite for supercapacitor application

The nano CaCO3 (nC) and various concentrations (0.02, 0.04, 0.06, and 0.08 M) of Eu3+ doped CaCO3/PEG nanocomposites (respectively represented as nCE1, nCE2, nCE3, and nCE4) were prepared through the biomimetic method. The functional groups, purity, and phase of the prepared products were assessed by FTIR and XRD. The prepared products were CaCO3/PEG and Eu3+ doped CaCO3/PEG with rhombohedral structures. The chemical state of the sample was studied using XPS, which revealed the presence of Ca, C, O, and Eu. No secondary phase was detected. FE-SEM and HR-TEM images of nCE4 show the distinct rhombohedral and spherical-like morphologies. The electrochemical performance of nC, nCE1, and nCE4 was investigated using a three-electrode system with Na2SO4 as the electrolyte. The prepared electrode materials behaved as pseudocapacitors, and the nCE4 electrode exhibited a specific capacitance value which is three times higher than that of the nC electrode. The present study suggests that nCE4 can be used as an electrode in supercapacitor applications. The cyclic stability of the CaCO3/PEG: Eu (0.08 M) nanocomposite after 1000 cycles at 3 A g−1 showed better cycle endurance, with a high retention of 97 %.

Advances in Nickel-cobalt Electrode Materials for Supercapacitors

With the rapid development of society, supercapacitors have been widely studied in energy storage devices for their unique advantages of high energy density, good cycle stability, fast charge and discharge speed. However, the development of supercapacitors is limited by low energy density. To address this challenge, it is important to develop and prepare electrode materials with excellent electrochemical properties for supercapacitors. To improve the energy density of supercapacitors, nickel-cobalt electrode materials have been widely studied due to their advantages of high energy density, high safety and long life. In this review, the research progress in material morphology and microstructure of supercapacitors prepared from nickel-cobalt metal oxides/hydroxides, sulfides, selenides and phosphates in recent years is summarized and prospected.

High-performance of the ZnO/NiS nanocomposite electrode materials for supercapacitor

In this work, a single transition metal oxide (ZnO) and metal sulfide (NiS) synthesized through a hydrothermal method and their combination of composite materials have been successfully prepared a simple and an easy approch a solid-state method. As the synthesized composite (ZnO/NiS) prepared different percentage ratio such as 7:3, 5:5 and 3:7 respectively. The ZnO, NiS and their nanocomposite materials characterized by using the XRD, SEM, HR-TEM, XPS and EDAX analysis. The electrochemical performance of as prepared electrode materials analyzed by CV, GCD and EIS spectra. The synthesized nanocomposite of ZnO/NiS at 5:5 ratio exhibited the brilliant capacitance of 1322 Fg−1 at 1 Ag−1 current density, capacitance retention of 76.66 % for continuous 1000 cycles at 4 Ag−1 and also calculated the power and energy density. These results suggests the ZnO/NiS at 5:5 ratio electrode is favorable electrode for an excellent performance supercapacitor.

Binder-free hydrothermal approach to fabricate high-performance zinc phosphate electrode for energy storage applications

Metal phosphates are an emerging class of materials with large porosity that endows them with high specific capacity and ionic conductivity. However, the binder and carbon additive are required to fabricate the electrodes which adds extra expenditure to the supercapacitor's overall fabrication cost. The binder-free electrode fabrication provides a hope to eliminate the need for binders and hence the carbon additive for supercapacitor applications. In this work, a binder-free zinc phosphate hydrate (ZPOH) based electrode is fabricated using a cost-effective hydrothermal method. Two additional electrodes were also fabricated – one without carbon additive (ZPOWCB) and another with the addition of carbon additive (ZPOCB) using the conventional slurry preparation method. ZPOH electrode showed remarkable enhancement in the specific capacity compared to the other two electrodes as it achieved a specific capacity of 433 C/g at a current density of 2 A/g. Moreover, ZPOH also showed negligible charge transfer resistance (Rct), depicting good electrolyte ions interaction with the active material. Hence, the easy and simple binder-free hydrothermal approach is more suitable for preparing electrode materials for energy storage applications.

Production of hierarchical porous bio‑carbon based on deep eutectic solvent fractionated lignin nanoparticles for high-performance supercapacitor

Owing to the low synthetic cost, low toxicity for most types and outstanding lignin solubility, deep eutectic solvents (DESs) have been recently exploited in fractionation of lignocellulosic biomass. Unfortunately, the DES-fractionated lignin, as another major product, was usually ignored and disposed improperly. Accordingly, the present study employed DES (choline chloride:lactic acid) to fractionate natural biomass for producing highly dispersed lignin nanoparticles. The obtained nano-lignin was utilized to prepare electrode materials for supercapacitors for the first time, and a higher specific capacitance than those prepared from conventional lignin was acquired. The results demonstrated that the lignin fractionation rate could be promoted via extending treatment time at low temperatures, whereas the DES to biomass mass ratio might be the lignin dissolution-limiting factor at high temperature. Uniform lignin nanoclusters could be obtained after DES fractionation, and increasing fractionation temperature was beneficial for preparing nano-lignin in DES. The cleavages of lignin-carbohydrate complexes and lignin subunits might account for the formation mechanism of lignin oligomers. Meanwhile, the aggregation of monolignols could contribute to the growth of lignin nanoparticles. The one-step KOH activation could induce hierarchical pores in lignin fractionated from moderate residence time, whereas two-step method was advisable for more aggregated DES-lignin. Based on the directly activated DES-lignin with a high surface area of 3577.3 m2 g−1, the prepared supercapacitor exhibited a superior specific capacitance of 248.8 F g−1. This study aimed to provide a novel method for producing high-performance energy storage carbon materials based on DES fractionated lignin from lignocellulose.

Biochar assisted cultivation of Chlorella protothecoides for adsorption of tetracycline and electrochemical study on self-cultured Chlorella protothecoides

Microalgae present a viable mechanism for purifying aquatic environments through the absorption of organic pollutants. In this paper, Chlorella protothecoides was cultured in a tetracycline environment, and biochar was added during the cultivation process. Compared with conventionally cultured Chlorella protothecoides, the addition of biochar for cultivation under a tetracycline environment increased the biomass of Chlorella protothecoides by 13.26 %. Moreover, the adsorption of tetracycline by biochar alone was not complete, but when mixed with Chlorella protothecoides, tetracycline was completely removed, which proved the biosorption of Chlorella protothecoides for low concentrations of tetracycline. Finally, the cultured Chlorella protothecoides was used further to prepare electrode materials, and it was found that the specific capacitance of the material reached 233.15F/g at a current density of 1 A/g. In this study, the use of biochar and Chlorella protothecoides to jointly adsorb tetracycline is of great significance for environmental protection and microalgae cultivation.

NiO/ZnO Composite Derived Metal-Organic Framework as Advanced Electrode Materials for Zinc Hybrid Redox Flow Battery.

NiO/ZnO composite derived metal-organic framework (MOF) is used as to modify carbon felt (CF) via a conventional solid-state reaction followed by ultrasonication. The prepared electrode material is used in zinc-hybrid redox flow batteries (RFBs) due to their high redox activity of Zn2+ /Zn. The electrochemical performance of composite modified CF and pre-treated CF was studied by cyclic voltammetry (CV) in 0.5 M aqueous zinc chloride with 5 M potassium hydroxide solutions showed clear confirmation for enhanced electrocatalytic activity. The unique porous structure of NiO/ZnO-derived MOF with increased surface area improves the battery behavior significantlyThe peak current ratio for the as-prepared material is about 3 times higher than that of the pre-treated CF due to more active sites. Zinc-based RFB with modified CF electrode exhibited better electrochemical performance with voltage efficiency (VE, 88 %), which is higher than true redox flow batteries.