Systematic exploration of defect-rich 2D nanopetal assembled 3D ZnO nanoflowers for improved photocurrent generation and photocatalytic performance

Abstract

Zinc Oxide (ZnO) stands as a highly significant metal oxide semiconductor with a large band gap of (3.2 eV), showcasing multifaceted properties. Significant findings of this study, designate the successful fabrication of 3D nanoflowers (NFs) with a specialized ZnO nanoarchitecture through a facile polyol process, considered by a notable presence of defect sites, as a photocatalyst for the deterioration of Rhodamine B (RhB). All ZnO NFs display increased absorption and a distinctive shift towards longer wavelengths, indicating a red shift phenomenon. Raman scattering, photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and electron spin resonance (EPR) unveiled that, the ZnO/24 hr, exhibited a notable abundance of defect states. The Brauner–Emmett–Teller (BET) analysis shows surface area of 55.14 m2g−1 for ZnO/24 hr resulted in a subsequent augmentation of the concentration of surface defects potentially enhancing the RhB photodegradation efficiency of 98%, surpassing the performance of other ZnO NFs samples, with a kinetic rate of 0.0638 min–1 under sunlight irradiation and better photocurrent response that improves the photogenerated separation of charge carriers. Hence, the findings from this investigation will offer novel perspectives for enhancing the photocatalytic and photoelectrochemical attributes of ZnO NFs grown over different durations.