Majid Khan

Fe and Mg tune binder-free SILAR-grown Cu ₂ O in different ways: 1 at% Fe stores the most charge (129 mF cm ⁻² ) while 1 at% Mg gives the fastest interfacial kinetics (18.5 Ω), so capacitance and kinetics optimise at different compositions.

Cu-BDC precursor conversion creates hierarchically porous CuO with a greatly increased accessible surface area, delivering enhanced charge storage and a stronger, more stable illumination-dependent anodic response.

A MOF-templated strategy yields ultra-microporous Bi ₂ O ₃ with hierarchical porosity and high surface area, enabling rapid ion diffusion and enhanced redox utilization, achieving 876 F g ⁻¹ and 47.2 Wh kg ⁻¹ with stable long-term cycling performance.

A NiO/NiS _x /MoS ₂ nanocomposite enables boosted HER performance and superior specific capacitance in a bifunctional energy material.

The integration of dual‐phase manganese oxides (MnO ₂ ‐Mn ₃ O ₄ ) with zinc oxide (ZnO) nanocomposites presents a compelling strategy to advance supercapacitor electrodes by synergizing the redox activity with structural stability. Here, solvothermally synthesized MnO ₂ ‐Mn ₃ O ₄ /ZnO nanocomposites (1:1, 1:2, 2:1 by wt%) are systematically investigated for their structural, optical, and electrochemical properties. X‐ray diffraction (XRD) confirms the coexistence of tetragonal Mn ₃ O ₄ and MnO ₂ phases alongside the hexagonal ZnO phase, whereas FTIR and EDX validate the interfacial bonding and stoichiometric purity. Scanning electron microscopy (SEM) reveals spherical and agglomerated morphologies, and XRD computes reduced crystallite sizes (14.3 nm for the 2:1 composite), enhancing the surface area for charge storage. Optical analyses unveil bandgap modulation (2.16–3.95 eV) driven by type‐II heterojunction formation, suppressing recombination, whereas photoluminescence (PL) spectra highlight defect‐mediated transitions critical for charge carrier dynamics. Electrochemically, the MnO ₂ ‐Mn ₃ O ₄ /ZnO (2:1) nanocomposite achieves a specific capacitance of 967 F/g at a current density of 1.5 A/g, an energy density of 108.8 Wh/kg, and a low charge‐transfer resistance of 377.4 Ω, outperforming individual MnO ₂ ‐Mn ₃ O ₄ and ZnO components. A symmetric supercapacitor device delivers 39 Wh/kg energy density with 99.7% capacitance retention over 50 cycles, attributed to Mn ³⁺ /Mn ⁴⁺ redox synergies and the conductive framework of ZnO. This work establishes dual‐phase MnO ₂ ‐Mn ₃ O ₄ /ZnO as a scalable and high‐performance electrode material, bridging redox‐driven energy storage with structural resilience for next‐generation supercapacitors.

This study reports the impact of two distinct capping agents on the structural and optical properties of CdZnS nanoparticles (NPs) using an aqueous colloidal synthesis technique. The samples were characterized using SEM, UV-Visible, Photoluminescence (PL) spectroscopy and X-ray diffraction (XRD). In all of the synthesized samples, SEM exhibits a granular texture with uniform distribution of particles. The capping agent helps in crystallite size reduction and hexagonal structure. The variation in the band gap is caused by quantum confinement depicted in PL spectra. The PL analysis also reveals the excitation-dependent blue emission for all the synthesized samples, with the capping agent-processed samples exhibiting a less pronounced blue shift in the emission peak. The IV characteristics measured via four probe shows the semiconducting nature of the synthesized nanoparticles.