High-performance Supercapacitor Electrode Research Articles

Experimental and theoretical investigation of high-performance supercapacitor based on guanidine functionalized graphene oxide

Functionalization of widely used graphene oxide (GO) can be beneficial not only in tuning its characteristics along with preventing the restacking of its layers and improving wettability but also in providing pseudocapacitance as a supercapacitor electrode. In this research, for the first time, the electrochemical performance of guanidine-functionalized graphene oxide (G-GO) examined by means of both computational and experimental methods. As a high-performance supercapacitor electrode, G-GO illustrates a high specific capacitance of 612F/g at the current density of 1.5 A/g together with extraordinary cyclic stability for 12,000 cycles at high current density of 10 A/g. Moreover, quantum capacitance together with the layer distance change during functionalization reaction, calculated via density functional theory (DFT), also exhibit the superior performance of G-GO.

Vanadium nitride-vanadium oxide-carbon nanofiber hybrids for high performance supercapacitors

Vanadium Nitride (VN) is attractive for energy storage due to its high conductivity (1.6 × 106 S/m) and specific capacitance (1350 F/g) but limited to alkaline electrolytes for redox. In contrast, V2O3 is redox active but not very conductive. In these hybrids a mixture of VN and vanadium oxide (V2O3) were encapsulated in electrospun carbon-nanofibers. A combination of VN and V2O3 takes advantage of the high conductivity from VN and the redox activity from V2O3. Additionally, having the vanadium encapsulated within the carbon can help with the stability as the electrolyte will not have direct interaction with the surface. These hybrids were made by in-situ nitridation of the encapsulated V2O5 followed by ex-situ activation with carbon dioxide. The hybrids were characterized by XPS and Raman spectroscopy. Hybrids of VN/V2O3-CNF showed increased capacitance of 245 Fg−1 with energy and power densities of 70.2 Wh kg−1 and 1751 W kg−1 in ionic liquid electrolyte. The devices showed good cycle stability with ∼90 % retention after 10,000 cycles at a current density of 1 Ag−1. These findings highlight the potential of VN/V2O3-CNF hybrids as high-performance supercapacitor electrodes. The combination of high conductivity and redox activity, along with encapsulation within CNFs, opens promising avenues for advanced energy storage.

Hierarchical Porous Carbon Based on Waste Quinoa Straw for High-Performance Supercapacitors.

This work presents a novel porous activated carbon electrode based on quinoa straw (QSC), which is derived from the Qinghai-Tibet Plateau. The QSC is prepared through simple precarbonization and potassium carbonate (K2CO3) activation processes and is intended for use in supercapacitors. The QSC-3 exhibits a high specific capacitance of 469.5 F g-1 at a current density of 0.5 A g-1, as well as a high specific surface area of 1802 m2 g-1. Additionally, symmetrical supercapacitors assembled using QSC-3 samples demonstrate a superior energy power density. In a 3 M KOH electrolyte, the energy density can reach 15.0 Wh kg-1 at a power density of 689.7 W kg-1. In a 1 M Na2SO4 electrolyte, the power density reaches 999.00 W kg-1, and the energy density is 39.68 Wh kg-1. Furthermore, the device shows excellent cycle life in both 3 M KOH and 1 M Na2SO4 electrolytes, with capacitance retentions of 97.55% and 96.20% after 10 000 cycles, respectively. This study provides an excellent example of utilizing waste quinoa straw to achieve low-cost, high-performance supercapacitor electrode material for sustainable electrochemical energy storage systems.

Exploration of the role of oxygen-deficiencies coupled with Ni-doped V2O5 nanosheets anchored on carbon nanocoils for high-performance supercapacitor device

Electronic structural engineering via integration of oxygen deficiencies and a variety of dopants in metal oxide electrodes has fascinated the research interest for developing next-generation supercapacitors. Herein, by incorporating Ni dopants and creating O vacancies, it has thoroughly been explored the potential of vanadium oxide (V2O5) nanosheets anchored on the carbon nanocoils (CNCs) grown on nickel foam (NF) for supercapacitor electrodes (OV-Ni-V2O5/CNCs/NF). We validate a synergistic effect provided by heterostructure designed with multifunctional nano geometries. It is found that O vacancies and Ni dopants alter the electronic states of V2O5 with enhanced electrical conductivity and enriched redox active sites. We optimized O vacancies and achieved a specific capacity of 3485F g−1 (1742.5C g−1) at 1 A/g, representing ∼ 3.8 × higher compared to the best prior report. Furthermore, an asymmetric supercapacitor device was assembled with binder-free electrodes, using O0.075-V2O5/CNCs/NF as a cathode and sulfur-doped CNCs as an anode, which delivered a high energy density of 144 W h kg−1 and long-term stability of 5000 cycles, which is superior to most of the previous studies. This study paves a rational strategy to design high-performance electrodes for next-generation supercapacitors and other energy storage technologies.

Preparation and comparison of polyaniline composites with lotus leaf-derived carbon and lotus petiole-derived carbon for supercapacitor applications

Biomass carbon is a class of economical and sustainable materials for supercapacitor electrode materials, while the low energy density restricts its development. Herein, lotus leaf-derived carbon (LLDC) and lotus petiole-derived carbon (LPDC) were prepared via carbonization and KOH activation processes. Then LLDC and LPDC were further modified with polyaniline to synthesize the polyaniline@lotus leaf-derived carbon (PANI@LLDC) and polyaniline@lotus petiole-derived carbon (PANI@LPDC) composites by the in-situ polymerization approach. The synthesized PANI@LPDC exhibited an ultra-large specific capacitance of 1332.5 F·g−1 at 0.3 A·g−1 and outstanding electrochemical stability of 89.2 % after 5000 cycles in the KI active electrolyte (1 M H2SO4 + 0.05 M KI), showing better electrochemical performance than PANI@LLDC (1190.3 F·g−1 at 0.3 A·g−1; 87.1 % after 5000 cycles). This is mainly due to the natural tubular structure of LPDC being more conducive to the movement of electrons, the introduction of Faradic capacitance by PANI and KI, and the porous structure of LPDC providing enough space for performing redox reactions. Moreover, a symmetric supercapacitor device assembled with two PANI@LPDC electrodes showed a superb energy density of 75.7 Wh·kg−1 at the power density of 540 W·kg−1. This study provides guidance for selecting different parts of biomass to prepare high-performance supercapacitor electrode materials.

Three-dimensional honeycomb composites consist of metal carbides and layered double hydroxides for high-performance supercapacitor electrode materials

To achieve excellent electrochemical performance and stability, a composite material based on metal carbides (MXene) and CoNiZn layered double hydroxides (LDHs) has been synthesized, which synergistically combines the high electrical conductivity of MXene with the high theoretical specific capacity of LDHs. The as-prepared three-dimensional honeycomb-structural MXene/CoNiZn LDH composites have excellent cycle stability with a capacitance retention rate of 87.8% after 100,000 cycles and outstanding electrochemical activity with a specific capacitance of 2044.9 F g−1 at a scan rate of 5 mV s−1. Furthermore, electrochemical impedance spectroscopy also shows a reduced internal resistance indicating that the honeycomb-porous structure facilitates electron transfer and ion diffusion. This study provides a feasible route to develop high-performance supercapacitor electrode materials.

Synthesis and Characterization of Modified Centrifuged-Electrospun Carbon Nanofibers for High-Performance Supercapacitor Electrodes

Background: Incorporating novel multifunctional effective materials into supercapacitors electrode is an ongoing requirement for hybrid supercapacitors with enhanced electrochemical performance. Methods: Herein, modified plasma-grafted multiwalled carbon nanotubes (CMS) with improved dispersion are embedded within centrifugal-spun carbon nanofibers as a hierarchical template (CNFs-CMS) to facilitate the growth of subsequent active materials. CNFs-CMS is then electroless plated with acicular nickel (Ni) balls, followed by one-step hydrothermal co-deposition to grow Ni(OH)2-MnO2 hybrid nanosheets. Significant findingsA binder-free, 3D interconnected nanostructures of CNFs-CMS@Ni@Ni(OH)2-MnO2 electrode material is employed for an all-in-one hybrid supercapacitor that exhibits excellent electric double layer (EDLC), battery-like and pseudocapacitance (PC) properties, along with a high surface area (665 m2 g−1) and conductivity (2.96 S cm−1). The as-fabricated electrode demonstrates specific capacitance (Cs) of 1063.33 F g−1 at a high current density of 20 A g−1 in 3M KOH electrolyte, maintaining capacitance retention of 92.5 % after 10,000 galvanostatic charge-discharge cycles. An asymmetric supercapacitor pairing CNFs-CMS@Ni@Ni(OH)2-MnO2 with CNFs-CMS is established, attributes comparably high energy density (52.54 Wh kg−1) and power density (59 kW kg−1) across a potential window of 1.2 V.

Enriched performance of practical device assisted asymmetric supercapacitor: NiO/Co3O4 intercalated with rGO nanocomposite electrodes

In this present report, we developed high performance supercapacitor electrode material of NiO/Co3O4/rGO ternary nanocomposites synthesized by a hydrothermal method with a different nickel and cobalt molar proportions. The phase formation, surface morphology and elemental information studies of binary NiO/Co3O4 and ternary NiO/Co3O4/rGO nanocomposites were investigated. The electrochemical investigations of the binary and ternary nanocomposites electrodes have been examined. Compare with various molar proportions, the ternary NiO/Co3O4(1,3)/rGO nanocomposites shows an extraordinary capacitance value of 980 Fg−1 at 1 Ag−1 as well as robust cycle life (cyclic retention of 92 % over the 5000 cycles at 10 Ag−1). In 0–1.4 V, an asymmetric supercapacitor attained a specific capacitance of 87.2 Fg−1 and large power density (1396.3 W/kg) with extreme energy density (23.7 Wh/kg). Moreover, assembled device reveals a great rate capability (89 % over the 5000 cycles in the electrolyte of PVA-KOH). The ternary electrode has high capacitance, capacitance retention and large energy density due to NiO and Co3O4 nanoparticles being intercalated with the high surface of rGO, as well as the synergetic effect of NiO/Co3O4 and rGO.

Regulating porous structure of coal-derived carbon materials by a dual-activation for high performance supercapacitors

Porous carbon plays an important role in supercapacitors with its favorable electrical conductivity, highly porous structure and superior chemical stability. However, the deep and tortuous ultramicropores in porous carbon greatly restricts the transport and transfer of electrolyte ions, resulting in the inferior electrochemical performance. Therefore, we propose a facile and green chemical activation method that uses KHCO3 and Zn(CH3COO)2·2H2O as dual activators to modulate the porous carbon structure. The synergistic activation between KHCO3 and Zn(CH3COO)2·2H2O endows the obtained porous carbons with hierarchical porous structure, honeycomb-like morphology and large specific surface area (1282 m2 g−1). In the three-electrode system, the optimal sample displays superior rate performance (70 % capacitance retention @ 50 A g−1) and high specific capacitance (321 F g−1 @ 1 A g−1). Symmetric two-electrode configurations were tested in 6 M KOH electrolyte, splendid cycling stability was observed (100 % capacity maintained after 10,000 cycles at 5 A g−1). Moreover, the symmetric supercapacitor assembled with neat EMIM BF4 as the electrolyte reveals a high energy density of 33 Wh kg−1 @ 624.6 W kg−1. This work offers new insights to manipulate the morphology and pore structure of coal-derived porous carbon for high performance supercapacitor electrode.

Optimization of a Conductive Polymer Layer on MOF-Derived Carbon Materials for High-Performance Supercapacitor Electrodes

Optimization of a Conductive Polymer Layer on MOF-Derived Carbon Materials for High-Performance Supercapacitor Electrodes

Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO3/ZnMn2O4 on Ni Foam Composites for High-Performance Supercapacitor Electrodes.

This study reports the facile synthesis of rationally designed composite materials consisting of nitrogen-doped graphene quantum dots (N-GQDs) and MnCO3/ZnMn2O4 (N/MC/ZM) on Ni foam using a simple hydrothermal method to produce high-performance supercapacitor applications. The N/MC/ZM composite was uniformly synthesized on a Ni foam surface with the hierarchical structure of microparticles and nanosheets, and the uniform deposition of N-GQDs on a MC/ZM surface was observed. The incorporation of N-GQDs with MC/ZM provides good conductivity, charge transfer, and electrolyte diffusion for a better electrochemical performance. The N/MC/ZM composite electrode delivered a high specific capacitance of 960.6 F·g-1 at 1 A·g-1, low internal resistance, and remarkable cycling stability over 10,000 charge-discharge cycles. Additionally, an all-flexible solid-state asymmetric supercapacitor (ASC) device was fabricated using the N/MC/ZM composite electrode. The fabricated ASC device produced a maximum energy density of 58.4 Wh·kg-1 at a power density of 800 W·kg-1 and showed a stable capacitive performance while being bent, with good mechanical stability. These results provide a promising and effective strategy for developing supercapacitor electrodes with a high areal capacitance and high energy density.

Electrodeposited Copper Tin Sulfide/Reduced Graphene Oxide Nanospikes for a High-Performance Supercapacitor Electrode.

Copper tin sulfide, Cu4SnS4 (CTS), a ternary transition-metal chalcogenide with unique properties, including superior electrical conductivity, distinct crystal structure, and high theoretical capacity, is a potential candidate for supercapacitor (SC) electrode materials. However, there are few studies reporting the application of Cu4SnS4 or its composites as electrode materials for SCs. The reported performance of the Cu4SnS4 electrode is insufficient regarding cycle stability, rate capability, and specific capacity; probably resulting from poor electrical conductivity, restacking, and agglomeration of the active material during continued charge-discharge cycles. Such limitations can be overcome by incorporating graphene as a support material and employing a binder-free, facile, electrodeposition technique. This work reports the fabrication of a copper tin sulfide-reduced graphene oxide/nickel foam composite electrode (CTS-rGO/NF) through stepwise, facile electrodeposition of rGO and CTS on a NF substrate. Electrochemical evaluations confirmed the enhanced supercapacitive performance of the CTS-rGO/NF electrode compared to that of CTS/NF. A remarkably improved specific capacitance of 820.83 F g-1 was achieved for the CTS-rGO/NF composite electrode at a current density of 5 mA cm-2, which is higher than that of CTS/NF (516.67 F g-1). The CTS-rGO/NF composite electrode also exhibited a high-rate capability of 73.1% for galvanostatic charge-discharge (GCD) current densities, ranging from 5 to 12 mA cm-2, and improved cycling stability with over a 92% capacitance retention after 1000 continuous GCD cycles; demonstrating its excellent performance as an electrode material for energy storage applications, encompassing SCs. The enhanced performance of the CTS-rGO/NF electrode could be attributed to the synergetic effect of the enhanced conductivity and surface area introduced by the inclusion of rGO in the composite.

Transforming polymeric air filters into high-performance supercapacitor electrodes through carbonization and fluorination

The global surge in disposable mask usage during the COVID-19 pandemic raises environmental concerns due to improper disposal. This study proposes an innovative method to repurpose polypropylene (PP) from disposable masks into highly efficient supercapacitor electrodes. Previous attempts faced challenges in electrochemical performance due to high charge transfer resistance. To overcome this, we introduce a unique approach, transforming PP masks into high-performance supercapacitor electrodes through thermal carbonization, activation, and fluorination. PVDF annealing fluorination simultaneously executes these transformations, resulting in a 40 % increase in specific capacitance, from 130.4 F g−1 to 183.3 F g−1. Our electrode materials exhibit remarkable durability, retaining an impressive 90.8 % of their initial capacity even after undergoing 8000 charge-discharge cycles, highlighting exceptional electrochemical performance. The porosity of the fluorinated carbon fibers (FCF) was determined through N2 adsorption at 77 K, revealing a pore volume of 0.5 cm3 g−1 and a specific surface area of 1175 m2 g−1. This study not only repurposes PP from masks but also enhances their electrochemical properties, addressing environmental impact and representing a significant stride in sustainable material development.

One-Pot Facile Synthesis of a Cluster of ZnS Low-Dimensional Nanoparticles for High-Performance Supercapacitor Electrodes.

To maximize the use of ZnS low-dimensional nanoparticles as high-performance supercapacitor electrodes, this work describes a simple one-pot synthesis method for producing a cluster of these particles. The ZnS nanoparticles fabricated in this work exhibit a cluster with unique low-dimensional (0D, 1D, and 2D) characteristics. Structural, morphological, and electrochemical investigations are all part of the thorough characterization of the produced materials. An X-ray diffraction pattern of clustered ZnS nanoparticles reflects the phase formation with highly stable cubic blende sphalerite polymorph. The confirmation of nanoparticle cluster formation featuring multiple low-dimensional nanostructures was achieved through field emission scanning electron microscopy (FE-SEM), while the internal structure was assessed using transmission electron microscopy (TEM). Systematically assessing the ZnS nanoparticles' electrochemical performance reveals their prospective qualities as supercapacitor electrode materials. The electrode assembled with this material on Ni foam demonstrates elevated specific capacitance (areal capacitance) values, reaching 716.8 F.g⁻1 (2150.4 mF.cm-2) at a current density of 3 mA.cm⁻2. Moreover, it reflects 69.1% capacitance retention with a four times increase in current density, i.e., 495.5 F.g-1 (1486.56 mF.cm-2) capacitance was archived at 12 mA.cm-2 with 100% Coulombic efficiency. Furthermore, the electrode exhibits prolonged cycling capability with 77.7% capacitance retention, as evidenced by its charge-discharge measurements sustained over 15,000 cycles at a current density of 25 mA cm⁻2.

Nitrogen-doped hollow carbon spheres decorated with NiCo alloy nanoparticles for high-performance supercapacitor electrode

Nitrogen-doped hollow carbon spheres (NHCSs) decorated with NiCo alloy nanoparticles (NPs) were prepared and examined for their prospective role as high-performance electrode materials. The NHCSs were synthesized through a silica-assisted synthesis method, followed by the decoration of NiCo alloy NPs onto the NHCSs using a simple wet impregnation method, employing a 1:1 M ratio of Co to Ni elements. The NiCo/NHCS-23, composed of NHCSs with 23 wt% of NiCo alloy NPs, exhibited a specific capacitance (Csp) of 536 F g−1 when tested in a 6 M KOH solution at a current density of 1 A g−1. This high Csp is attributed to the synergistic effect of the faradaic charge storage provided by NiCo alloy NPs and the N-doped hollow carbon structure. The N content of the NHCSs and NiCo/NHCS-23 was found to be 1.9 % and 2.2 %, respectively. Symmetric supercapacitor (SSC) devices were assembled using two NiCo/NHCS-23 electrodes and a 0.5 M tetraethylammonium tetrafluoroborate/propylene carbonate electrolyte. The resulting SSC device operated within a potential window of 3.5 V and exhibited an energy density of 16.1 Wh kg−1 at the power density of 250 W kg−1. The SSC device demonstrated impressive cycling stability, maintaining 90.0 % capacitance and 83.1 % Coulombic efficiency after 5000 cycles. These results suggest that NiCo/NHCS nanocomposites have significant potential for utilization in high-energy storage applications.

Synthesis of high-performance supercapacitor electrode materials by hydrothermal route based on ZnSe/MnSe composite

The energy crises have emerged in the contemporary period due to the rapid expansion of industry. The expansion of high-capacity storage systems that can operate independently and use renewable energy is essential. The pseudocapacitors are known for their excellent anode properties, which contribute to high specific capacitance (Cs). Transition metal selenide (TMS) has arisen as a highly promising choice for anode materials in supercapacitor (SCs) devices, owing to its noteworthy conductivity and storage capacity. In the current investigation, the simple hydrothermal approach was utilized to achieve the successful synthesis of the binary ZnSe@MnSe (ZS@MS) composite for electrode material. However, crystallinity of ZS@MS composite indicates its potential for utilization as an electrode in supercapacitor (SCs) applications. Moreover, ZS@MS electrode revealed remarkable specific capacitance (Cs) of 1439.98 F g−1 in electrochemical performance. In addition, ZS@MS electrode exhibits a high energy density (Ed) of 56.17 Wh kg−1 and power density (Pd) 265 W kg−1 at 1 A g−1. Moreover, ZS@MS electrode demonstrates stable behavior and exceptional cyclic stability over 5000th cycles. Fabricated ZS@MS electrode material possesses more electrochemical properties than pure materials, making it highly promising for supercapacitors (SCs) and other energy storage-related applications.

Porous 3D honeycomb structures formed from interconnected Ni(OH2) sheets on CNT-coated hybrid framework as high-performance electrodes for supercapacitors

Here, we report the effective hydrothermal synthesis of nickel hydroxide [Ni(OH)2] nanomaterials with a honeycomb-like structure comprising two-dimensional (2D) nanoplates formed from nanosheet arrays. According to the powder X-ray diffraction data, a composite consisting of Ni(OH)2 and carbon nanotubes was effectively created. The presence of significant vibrations of CNT and Ni(OH)2 was verified by FTIR and Raman spectra. Elements in the synthesized composite were validated by energy-dispersive X-ray analysis, and experimental and theoretical values agreed well. Specific capacitance of 1715 Fg−1 at 1 Ag−1 was attained with novel Ni(OH)2 designs incorporated over CNT Ni foam. The effectiveness of the honeycomb Ni(OH)2@CNT network device is equivalent to that of existing carbon-based and metal oxide/carbon-based solid-state supercapacitor devices, with a maximum energy density of 77.2 Whkg−1 and a power density as high as 866 Wkg−1. In particular, after 10,000 cycles, this material retains a large percentage of its original capacitance (94.4 % to be exact) while still maintaining a respectable Coulombic efficiency (84.5 %). These encouraging findings suggest these materials might be used in efficient, cheap, and safe energy storage systems.

Sweet Side Streams: Sugar Beet Pulp as Source for High-Performance Supercapacitor Electrodes.

Valorization of the lignocellulosic side and waste streams is key to making industrial processes more efficient from both an economic and ecological perspective. Currently, the production of sugars from beets results in pulps in large quantities. However, there is a lack of promising opportunities for upcycling these materials despite their promising properties. Here, we investigate beet pulps from two different stages of the sugar manufacturing process as raw materials for supercapacitor electrodes. We demonstrate that these materials can be efficiently converted to activated, highly porous carbons. The carbons exhibit pore dimensions approaching the size of the desolvated K+ and SO42- ions with surface areas up to 2600 m2 g-1. These carbons were subsequently manufactured into electrodes, assembled in supercapacitors, and tested with environmentally friendly aqueous electrolytes (6 M KOH and 1 M H2SO4). Further analysis demonstrated the presence of capacitance-enhancing functionalities, and up to 193 and 177 F g-1 in H2SO4 and KOH, respectively, were achieved, which outperformed supercapacitors prepared from commercial YP80 F. Overall, our study suggests that side streams from sugar manufacturing offer a hidden potential for use in high-performance energy storage devices.

Self-assembled high polypyrrole loading flexible paper-based electrodes for high-performance supercapacitors

Despite the intriguing features of freestanding flexible electronic devices, such as their binder-free nature and cost-effectiveness, the limited loading capacity of active material poses a challenge to achieving practical high-performance flexible electrodes. We propose a novel approach that integrates multiple self-assembly and in-situ polymerization techniques to fabricate a high-loading paper-based flexible electrode (MXene/Polypyrrole/Paper) with exceptional areal capacitance. The approach enables polypyrrole to form a porous conductive network structure on the surface of paper fiber through MXene grafting via hydrogen bonding and electrostatic interaction, resulting in an exceptionally high polypyrrole loading of 10.0 mg/cm2 and a conductivity of 2.03 S/cm. Moreover, MXene-modified polypyrrole paper exhibits a more homogeneous pore size distribution ranging from 5 to 50 μm and an increased specific surface area of 3.11 m2/g. Additionally, we have optimized in-situ polymerization cycles for paper-based supercapacitors, resulting in a remarkable areal capacitance of 2316 mF/cm2 (at 2 mA/cm2). The capacitance retention rate and conductivity rate maintain over 90 % after undergoing 100 bends.The maximum energy density and cycling stability are characterized to be 83.6 μWh/cm2 and up to 96 % retention after 10,000 cycles. These results significantly outperform those previously reported for paper-based counterparts. Overall, our work presents a facile and versatile strategy for assembling high-loading, paper-based flexible supercapacitors network architecture that can be employed in developing large-scale energy storage devices.

Porous Mn2O3 nanorods-based electrode for high-performance electrochemical supercapacitor

In this research, we introduce an effective electrode material, i.e. porous manganese oxide (Mn2O3) nanorods (NRs) prepared by simple hydrothermal process, designed for use in electrochemical supercapacitors. XRD analysis unequivocally confirms that the Mn2O3 NRs possess a pure cubic crystalline structure with an Ia3 space group, indicating the high degree of crystallinity and phase purity. Morphological examinations confirmed that the Mn2O3 NRs display a distinct rod-like structure, featuring an average size of around 30 nm, underscoring their nanostructured characteristics. The electrochemical performance of the synthesized Mn2O3 NRs as electrodes for supercapacitors was thoroughly examined, resulting in an impressive specific capacitance of 483 F/g at a scan rate of 10 mV/s. Electrochemical impedance spectroscopy (EIS) analysis was carried out to assess the effective series resistance (ESR), revealing a minimal resistance value of 3.2 Ω, highlighting excellent charge transfer kinetics. Mn2O3 NRs electrode displayed exceptional capacitance retention even after undergoing 500 charge–discharge cycles at a high current density of 5 A/g, indicating their remarkable chemical stability as an electrode material. This study introduces a promising and scalable approach for the development of high-performance supercapacitors, with Mn2O3 NRs as a critical component, and offers valuable insights into the design and engineering of advanced energy storage devices.