In light of the growing interest and ability to search for new materials, we have synthesized Nickel oxide (NiO) nanoparticles decorated Zinc (ZnO) nanorods composite (NiO/ZnO) nanostructure. The NiO/ZnO heterostructure formation was confirmed by X-ray powder diffraction and high-resolution transmission electron microscopy (HRTEM). The fabricated environmental friendly NiO/ZnO composite nanostructure shows a well-defined photoreduction characteristic of hexavalent Chromium (Cr) (VI) to tri-valent Chromium (Cr) (III) under UV-light. Such an enhanced photoreduction property is attributed due to the decreased electron-hole recombination process which was proved by photoluminescence (PL) spectroscopy, photocurrent study, and electrochemical impedance spectroscopy. Furthermore, the photocatalytic activity rate of the NiO decorated ZnO nanorods was much higher than that of bare ZnO nanorods for the reduction of chromium (VI) and the rate is found to be 0.306 min⁻¹. These results have demonstrates that suitable surface engineering may open up new opportunities in the development of high-performance photocatalyst.

鉴于人们日益增长的兴趣和寻找新材料的能力，我们已经合成了装饰有氧化锌（NiO）纳米颗粒的锌（ZnO）纳米棒复合材料（NiO / ZnO）纳米结构。通过X射线粉末衍射和高分辨率透射电子显微镜（HRTEM）证实了NiO / ZnO异质结构的形成。制成的环保型NiO / ZnO复合纳米结构在紫外光下具有良好的六价铬（VI）到三价铬（III）的光还原特性。这种增强的光还原性能归因于减少的电子-空穴复合过程，这通过光致发光（PL）光谱，光电流研究和电化学阻抗谱证明。此外，^-1。这些结果表明，合适的表面工程可能会为高性能光催化剂的开发开辟新的机会。