Electrochemical performance of complex oxides of manganese incorporated vanadium pentoxide-based electrode materials for energy storage applications

The low cost and profusion of sodium resources make sodium-ion batteries (SIBs) a potential alternative to lithium-ion batteries for grid-scale energy storage applications. However, the use of conv...

Ti, F Codoped Sodium Manganate of Layered P2-Na _0.7 MnO _2.05 Cathode for High Capacity and Long-Life Sodium-Ion Battery

Boosting the Rate Performance of Li–S Batteries via Highly Dispersed Cobalt Nanoparticles Embedded into Nitrogen-Doped Hierarchical Porous Carbon

Controllable fabrication of mesoporous carbon nanoparticles (MCNs) with tunable pore structures is of great interest, due to the remarkable effect of pore structure on electrochemical performance o...

Plasma-assisted lattice oxygen vacancies engineering recipe for high-performing supercapacitors in a model of birnessite-MnO2

ABSTRACTA novel monomer called 1,1′‐ferrocenediacyl anilide (FcA) was synthesized from ferrocene (Fc). Copolymerization was carried out between FcA and aniline (ANI) by an electrochemical method. The novel monomer and copolymer were characterized with 1H‐NMR, Fourier transform infrared (FTIR) spectroscopy, and ultraviolet–visible (UV–vis) spectroscopy. The hydrogen protons of the benzene ring were moved to a low field in 1H‐NMR, and the absorption band of NQN (where Q is the quinoid ring) appeared in the FTIR spectrum of the polymer. The peaks of both Fc and the π–π* electronic transition in the UV–vis spectra were redshifted. The results indicate that the copolymer mainly existed as a highly delocalized conjugated system. X‐ray diffraction analysis established further proof, and the process of electrochemical deposition was observed by scanning electron microscopy. The optimal synthesis conditions of the copolymer were determined through changes in the monomer molar ratios and the scan rate. The ideal performance of the copolymer was gained when the monomer molar ratio between FcA and ANI was 1:4 and the scan rate was 50 mV/s. Furthermore, the electrochemical performances were tested in detail by cyclic voltammetry, galvanostatic charge–discharge testing, and electrochemical impedance spectroscopy. The results show that the specific capacitance of poly(1,1′‐ferrocenediacyl anilide‐co‐aniline) increased up to 433.1 F/g at 0.5 A/g, the diffusion resistance was very small, and the durability was good enough. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43217.

2H-MoS ₂ Modified Nitrogen-Doped Hollow Mesoporous Carbon Spheres as the Efficient Catalytic Cathode Catalyst for Aprotic Lithium-Oxygen Batteries

Activated carbon is heat-treated in a H2 atmosphere at 600, 800, and 1000 °C for 1 h, respectively, to be used as electrode material for electrical double layer capacitors (EDLCs). After heat treatment, the surface morphology has no obvious change as compared with the raw material. The specific surface area and pore volume of sample treated at 600 °C have a slightly increase while those of samples treated at higher temperature decrease. XPS and elemental analysis indicate that oxygen containing functional groups on the sample are significantly reduced after treatment. The electrochemical performance of samples was evaluated using cyclic voltammetry and galvanostatic charge–discharge tests in 1 M TEABF4/PC electrolyte. The sample treated at 600 °C shows the optimized electrochemical performance with increase capacitance, enhanced stability, and improved energy density. Its initial specific capacitance is near 127 F/g, and initial coulombic efficiency is about 52 %. At 3.0 V, its energy density reaches 32 Wh/kg and specific capacitance is about 70 F/g at 1 A/g even after 10,000 charge–discharge cycles. Thus, heat treatment at 600 °C under H2 atmosphere is an effective method to improve electrochemical properties of EDLCs based on activated carbon material.

With the worldwide awareness of sustainability, biomass-derived carbon electrode materials for supercapacitors have attracted growing attention. In this research, for the first time, we explored the feasibility of making use of the carbon byproduct from hydrothermal liquefaction (HTL) of microalgae, termed herein as algae-derived carbon (ADC), to prepare sustainable carbon electrode materials for high-performance supercapacitor development. Specifically, we investigated carbon activation with a variety of activating reagents as well as N- and Fe-doping of the obtained ADC with the intention to enhance its electrochemical performance. We characterized the structure of the activated and doped ADCs using scanning electron microscope (SEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and BET surface area and pore analysis, and correlated the ADCs’ structure with their electrochemical performance as evaluated using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), impedance, and cycle stability through an assembled symmetric two-electrode cell with 1 M H2SO4 as electrolyte. It was found that the ADC that is activated using KOH (KOH-ADC) showed the best electrochemical performance, and its specific capacitance was 14.1-fold larger with respect to that of the raw ADC and reached 234.5 F/g in the GCD test at a current density of 0.5 A/g. The KOH-ADC also demonstrated excellent capacitance retention (97% after 10,000 cycles at a high current density of 10 A/g) for stable long-term operations. This research pointed out a promising direction to develop sustainable electrode materials for supercapacitors from the carbon byproduct produced after HTL processing of algae.

Mass loading and potential plateau are the two most important issues of potassium (K)-ion batteries (KIBs), but they have long been ignored in previous studies. Herein, we report a simple and scala...

Inorganic perovskite photo-assisted supercapacitor for single device energy harvesting and storage applications

The growing demand for flexible and lightweight energy storage solutions in wearable and portable electronics has driven significant advancements in high-performance supercapacitors. These devices are characterized by rapid charge-discharge capabilities, high power density, and extended cycle stability, making them promising for flexible electronic applications. This study reports the development of a novel composite electrode material comprising reduced graphene oxide (rGO), etched MXene, and Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with carboxymethyl cellulose (CMC).The integration of rGO and MXene into the PEDOT:PSS/CMC matrix leverages the exceptional electrical conductivity, mechanical flexibility and high specific surface area of these two-dimensional nanomaterials, addressing challenges of brittleness and limited cyclic stability in supercapacitor electrodes. The synthesized composite electrode demonstrated superior electrochemical performance, with a specific capacitance of 692 F/g at a scan rate of 2 mV/s, indicating remarkable energy storage potential. When fabricated into a flexible solid-state supercapacitor utilizing a gel polymer electrolyte, the device exhibited a specific capacitance of 290 F/g, an energy density of 41.69 Wh/kg, and a power density of 250 W/kg. Notably, the supercapacitor maintained 87.84% of its initial capacitance after 15,000 charge-discharge cycles, with a Coulombic efficiency of 99.62%, underscoring its exceptional long-term stability and durability. Comprehensive electrochemical characterization was conducted using cyclic voltammetry (CV) electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge (GCD) testing,. The CV curves maintained a highly rectangular shape even at high scan rates, indicating fast charge transfer rates and good conductivity. The symmetry of the GCD curves further confirmed the excellent capacitive characteristics of the composite electrode.

Synthesis and physicochemical properties of LiAl 0.05Mn 1.95O 4 cathode material by the ultrasonic-assisted sol–gel method

In this article, we have investigated the impact of various aqueous electrolytes on the electrochemical performance of Ti3C2Tx-BiFeO3 (MXene-BFO) nanocomposites for energy storage applications. Structural and morphological characterizations were performed utilizing X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The study focused on four electrolytes: NaOH, Na2SO4, MgSO4, and LiCl, exploring their interactions with the MXene-BFO nanocomposites system. Electrochemical analyses, including cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) tests, and electrochemical impedance spectroscopy (EIS), were conducted to evaluate specific capacitance, potential windows, and impedance characteristics. Notably, the nanocomposite demonstrated optimal pseudocapacitive performance in 1 M NaOH, exhibiting a specific capacitance of 532 F/g at a scan rate of 2 mV/sec, and achieved an energy density of 53.8 Wh/kg and a power density of 1.62 kW/kg at a current density of 1 A/g. This electrolyte also displayed low electrolyte resistance (2.9 Ω) and favorable charge transfer resistance (1.5 Ω), with significant coulombic efficiency over 10,000 charge-discharge cycles. These findings underscore the potential of 1 M NaOH as a highly effective electrolyte for enhancing the performance of MXene-BFO nanocomposites-based supercapacitors, offering substantial insights into the optimization of electrode-electrolyte interactions in advanced energy storage systems.

The surface area and pore distribution of activated carbons (ACs) were characterized by nitrogen adsorption isotherms at 77 K, and double layer capacitors were assembled to demonstrate the electrochemical performance. With 1 mol·L-1 tetraethylammonium tetrafluoroborate dissolved in acetonitrile (Et4NBF4/AN) as electrolyte, electrochemical methods including cyclic voltammetry (CV) and galvanostatic charge-discharge tests were used to evaluate the capacitors. Results show that the surface area has a limited effect on the specific capacitance of ACs and the increaing of mesoporous content can decrease the capacitance decay rate at large discharge current. When current increases from 0.15A·g-1 to 9.6A·g-1, the minimum specific capacitance decay rate of mesoporous ACs is 10.93%, while that of the microporous ACs is 15.21%;the contributions of mesoporous surface area to the specific capacitance drop from 10.10 to 9.95μF·cm-2, while that of microporous surface area drop from 5.68 to 4.21μF·cm-2.