This study highlights for the first‐time the utilization of nickel foam coated with activated carbon (AC) via the electrophoretic deposition (EPD) method in the fabrication of A7 sized pouch cell supercapacitors. The scale‐up of electrodes via EPD from coin to pouch cells with mass loadings (10 mg cm⁻²) and thicknesses (>130 μm) that match industrial standards is also reported. Research investigations include: (a) comparison of a two dimensional (2D) aluminum foil current collector's performance with three dimensional (3D) microporous nickel foam current collectors, (b) impact of EPD of AC onto small (10 cm²) and large areas (50 cm²) of nickel foam, and (c) scaling‐up of coin to pouch cells along with a comparison against electrodes prepared via the standard doctor blade coating (or slurry casting) method. We demonstrate practical cell performance, including specific current loading (40 A g⁻¹), hundred thousand of successive charge and discharge operation (150,000 cycles), power (27 kW kg⁻¹) and energy densities (37.7 W h kg⁻¹), capacitance (174 F g⁻¹), capacitance retention (80 %) and coulombic efficiency (close to 100 %).

ZnO–Fe ₃ O ₄ obtained from electric arc furnace dust revealed the following properties as an asymmetric supercapacitor; C _s = 35.2 mF cm ⁻² , E = 25.03 μWh cm ⁻² , P = 430.81 μW cm ⁻² , and 81% capacitance retention after 7000 cycles.

Supercapacitors are widely accepted to be highly promising for energy storage due to their high capacitance and power density with super-long cycling stability. In addition, flexible and binder-free nanomaterials play a crucial role in supercapacitor devices and systems. Herein, we present thienothiophene (TT) and single-wall carbon nanotube (SWCNT)-based two hybrid materials, possessing triphenylamine (TPA), thiophene (Th) and EDOT moieties, i.e. TT-Th-TPA-SWCNT and TT-EDOT-TPA-SWCNT, as highly efficient supercapacitors with flexible and free-standing properties. The nanohybrids were obtained by noncovalent modifications of SWCNTs without using any binding agents. Their hybrid electrodes displayed remarkable supercapacitor performances and energy storage properties with an excellent power density of 10 000 W kg⁻¹ at 20 A g⁻¹, a maximum energy density of 5.19 ± 0.13 Wh kg⁻¹ at 0.1 A g⁻¹ and a maximum specific capacitance of 158 F g⁻¹ at 1 mV s⁻¹. Regarding the GCD results, 10 000 cycle stability was achieved with a coulombic efficiency of over 95%. These findings highlight the potential of TT and SWCNT-based hybrid materials as advanced electrodes in energy storage applications.

The present study involved the production of a novel hybrid supercapacitor electrode material ZnO–MgO from ferrochrome ash (FCA) waste using a hydrometallurgical method for the first time in the literature. FCA was initially leached with H₂SO₄ solutions with varying concentrations and leaching durations at the solid:liquid ratio of 100 g/L. The optimal leaching parameters were determined as 1-M H₂SO₄ concentration and 60 min, which resulted with the 91.35% of Zn and 31.69% of Mg leaching efficiency. Afterward, the leached ions were precipitated as hydroxides by pH adjustment. Obtained precipitates were subsequently calcined at 500, 750, and 1000 °C to obtain three different ZnO–MgO hybrid materials with various morphological and electrochemical properties. The obtained materials were employed as electrode materials in coin cell-type asymmetric supercapacitors, and the electrochemical performance of the supercapacitors were assessed using CV, GCD, and EIS analyses. The supercapacitor containing the anode calcined at 750 °C exhibited the highest specific capacitance value as 486 mF cm⁻² at a scan rate of 10 mV cm⁻² and retained 93% of its initial capacitance after 5000 GCD cycles at the current density of 0.5 mA cm⁻².