The double perovskite oxide Dy₂CoMnO₆ (DCMO) has been synthesized by the sol‒gel citrate method in the form of nanoparticles with an average particle size of 110 ± 5 nm as obtained from TEM measurement. The Rietveld refinement of the X-ray diffraction (XRD) pattern suggests monoclinic P2₁/n crystal structure. The band gap of the material of 1.93 eV is obtained from the UV–vis diffuse reflectance spectrum. The X-ray photoemission spectroscopic study reveals the multiple oxidation states of Co and Mn in DCMO. The photocatalytic behavior of DCMO is evaluated by the photodegradation of rhodamine-B (Rh-B) under the visible light irradiation. The results indicate that DCMO nanoparticles exhibit remarkable photocatalytic efficiency by degrading the Rh-B almost 98% in 4 h. The Mott–Schottky experiment suggests the p-type semiconducting nature of DCMO. We have also schematically represented the possible photocatalytic reaction with the band edge positions of DCMO with respect to the reactive oxygen species formation potential. The electrical properties and the charge carrier dynamics of the material are investigated using the alternating current impedance spectroscopy in a wide range of temperature and frequency. The activation energy of 0.31 eV obtained from the temperature dependence Dc conductivity suggests the p-type polaronic conduction in DCMO.

双钙钛矿氧化物 Dy ₂ CoMnO ₆ (DCMO) 已通过溶胶-凝胶柠檬酸盐法以纳米粒子的形式合成，从 TEM 测量中获得平均粒径为 110 ± 5 nm。X 射线衍射 (XRD) 图案的 Rietveld 细化表明单斜 P2 ₁/n 晶体结构。1.93 eV 材料的带隙是从 UV-vis 漫反射光谱中获得的。X 射线光电发射光谱研究揭示了 DCMO 中 Co 和 Mn 的多种氧化态。通过在可见光照射下罗丹明-B（Rh-B）的光降解来评估DCMO的光催化行为。结果表明，DCMO纳米颗粒通过在4小时内降解近98%的Rh-B而表现出显着的光催化效率。Mott-Schottky 实验表明 DCMO 具有 p 型半导体性质。我们还示意性地表示了可能的光催化反应与 DCMO 的带边位置相对于活性氧物质形成电位。使用交流阻抗谱在很宽的温度和频率范围内研究材料的电性能和电荷载流子动力学。从温度依赖性直流电导率获得的 0.31 eV 活化能表明 DCMO 中的 p 型极化子传导。