Akademik Veri Yönetim Sistemi
CHEMISTRYSELECT, cilt.11, sa.23, 2026 (SCI-Expanded, Scopus)
The development of sustainable and cost-effective catalysts for hydrogen peroxide (H2O2) electrooxidation is crucial for advancing green energy technologies. In this study, we systematically investigate three natural mica minerals, biotite (Bt), margarite (Mg), and muscovite (Ms), as potential electrocatalysts for H2O2 oxidation in alkaline media. The minerals were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) surface area analysis. Three electrochemical methods were used: cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA). Ms was identified as the most active mineral, with the highest net H2O2 oxidation current density of 15.29 mA/cm2. The Tafel plot yielded a Tafel slope of 137.05 mV/dec, while a turnover frequency (TOF) of 1.24 & times; 10-1 s-1 was obtained, indicating fast electron-transfer kinetics and high intrinsic catalytic activity. Chronoamperometric analysis confirmed the short-term operational stability of Ms, while DFT calculations provided supportive insight into its electronic structure and charge-transfer capability. The HOMO-LUMO energy gap was moderate, at 2.367 eV, suggesting that the compound would exhibit good energetic stability and electron-transfer efficiency during the reaction process. These results demonstrate that Ms is a promising low-cost and environmentally benign catalyst for H2O2 electrooxidation.