This study reveals, for the first time, the excellent capability of MnWO₄-CNT as a supercapacitor electrode compared to MnWO₄. In previous research conducted on this compound, RGO was used to enhance its electrochemical properties. The objective of this study is to investigate the effects of CNT on the electrochemical properties of the compound, which also yielded promising results. The physical and morphological analysis of MnWO₄ and MnWO₄-CNT was conducted using Raman, XRD, BET, and SEM-EDX techniques. The electrochemical performance of the samples was assessed through cyclic voltammetry (CV), impedance electrochemical spectroscopy (EIS), and galvanostatic charge–discharge (GCD). Notably, MnWO₄-CNT exhibited a significant specific capacitance of 1849.14 F·g⁻¹ at a scan rate of 10 mV·s⁻¹. The stability evaluation of the samples demonstrated a high capacitance retention of 81.2% and 89.4% for MnWO₄ and MnWO₄-CNT, respectively. The substantial specific capacity, along with the favorable stability of MnWO₄-CNT, positions it as a highly promising material for utilization in supercapacitor electrodes.

In this paper, for the first time, a CoNi₂O₄ nanocatalyst coated on the surface of activated carbon wheat husk (ACWH) was synthesized in the form of CoNi₂O₄/ACWH through a hydrothermal process. The electrocatalytic activity of this catalyst was evaluated using methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) processes for use in anodes of alcohol fuel cells. Adding ACWH, as a cheap carbon biomass with an excellent active surface area, improves the performance of the catalyst in the oxidation of alcohols. The current density of CoNi₂O₄/ACWH in the MOR process is 160 mA/cm² at an optimal methanol concentration of 2 M; this oxidation current density in the EOR process and at a concentration of 1.5 M ethanol is 150 mA/cm². The stability of CoNi₂O₄/ACWH in MOR and EOR processes, after 1000 consecutive CV cycles, is 98.6% and 94.6%, respectively.

The escalating demand for sustainable energy amid fossil fuel depletion and environmental crises has propelled research into advanced electrocatalysts for direct alcohol fuel cells (DAFCs). This study introduces a pioneering CoNi₂O₄/MXene nanocomposite, synthesized via a one-step hydrothermal method, as a high-performance anode catalyst for the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR), outperforming pristine CoNi₂O₄. Unlike prior works focusing on single-metal or loosely integrated composites such as nickel ferrite/MXene or Ni nanoparticles on Mxene this hybrid uniquely leverages the spinel structure of CoNi₂O₄ with its mixed oxidation states (Co²⁺/Co³⁺ and Ni²⁺/Ni³⁺) and MXene’s (Ti₃C₂) layered conductivity, achieving unprecedented synergy for enhanced electron transfer, active site exposure, and CO poisoning resistance. Physical analyses (XRD, FESEM, BET) confirmed successful integration, revealing a doubled specific surface area (109.36 vs. 61.64 m²/g) and porous fibrous morphology. Electrochemical evaluations showed superior activity with significantly enhanced peak current densities and lower oxidation potentials for both MOR and EOR compared to pristine CoNi₂O₄, alongside exceptional stability (94.6% and 91.6% retention after 1000 cycles at 100 mV/s). Lower Tafel slopes (138 mV/dec for MOR, 72.6 mV/dec for EOR) and reduced charge transfer resistance (<7 Ω) underscore its edge over noble metal alternatives. This transformative design not only addresses scalability and durability gaps in existing catalysts but also paves the way for cost-effective, efficient DAFCs in renewable energy applications. The alternative text for this image may have been generated using AI.