Polymer electrolyte films of polyvinyl pyrrolidone (PVP) embedded with various concentrations of Cr³⁺ ions were prepared by a solution casting technique. The complexation between the Cr³⁺ ions and the polymer was confirmed by Fourier transform infrared (FTIR) spectroscopy and UV–vis spectroscopy. The electrical conductivity of the films was measured using an impedence analyzer in the frequency range of 42 Hz to 5 MHz at ambient temperature. It was observed that the conductivity increased with the increase in the Cr³⁺ ion concentration. UV–visible absorption spectra in the wavelength range of 200–800 nm were used to determine the direct and indirect optical energy band gaps and optical absorption edge. Both of the optical band gaps decreased with the increase in Cr³⁺ ion concentration. FTIR studies on pure and Cr³⁺ doped PVP polymer films revealed the vibrational changes that occurred due to the effect of the dopant Cr³⁺ ions in the polymer. Our results suggested that Cr³⁺, as a dopant, is a good choice to improve the electrical properties of PVP polymer electrolytes.

通过溶液流延技术制备了嵌入有各种浓度的Cr ³⁺离子的聚乙烯吡咯烷酮（PVP）的聚合物电解质膜。Cr ³⁺离子与聚合物之间的络合已通过傅里叶变换红外（FTIR）光谱和UV-vis光谱确认。使用阻抗分析仪在环境温度下在42 Hz至5 MHz的频率范围内测量薄膜的电导率。观察到电导率随Cr ^3+的增加而增加离子浓度。紫外可见吸收光谱在200–800 nm的波长范围内用于确定直接和间接的光能带隙和光吸收边缘。随着Cr ³⁺离子浓度的增加，两个光学带隙均减小。FTIR对纯和Cr ³⁺掺杂的PVP聚合物薄膜进行的FTIR研究表明，由于聚合物中掺杂的Cr ³⁺离子的作用，发生了振动变化。我们的结果表明，Cr ³⁺作为掺杂剂，是改善PVP聚合物电解质电性能的理想选择。