A simple co-precipitation method has been used to synthesis SnO₂ and different transition metal (Fe, Cu and Zn) doped SnO₂ spherical nanostructures. The influence of doping concentration on the structural, optical, functional and morphological properties were carefully analysed by using X-ray diffraction, Fourier Transform Infrared Spectroscopy, UV–Visible spectroscopy and Scanning Electron Microscopy studies. The XRD pattern declared the formation of cassiterite rutile SnO₂ with tetragonal structure. No impurity peaks correspond to the transition metal dopant was observed in the doped SnO₂ samples. The average crystallite size was found to be 27.2, 24.1, 22.3 and 21.8 nm for pure and Fe, Cu and Zn-doped samples, respectively. The EDX spectra and element mapping assessed the presence of Sn, O, Fe, Cu and Zn species. The SEM images showed the spherical morphology for the synthesized pure and TM-doped samples. X-ray photoelectron spectra confirmed the electronic state and binding energy of the Sn, Cu, Zn, Fe and O. The electrochemical performance of the prepared electrodes were evaluated by galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy. The nanostructured Fe doped SnO₂ electrode revealed a favorable specific capacitance of 270 F/g at a current density of 0.5 A/g and also it has excellent cycling stability of 98% retention over 2000 charging discharging cycles.

一种简单的共沉淀方法已被用于合成SnO ₂和不同的过渡金属（Fe，Cu和Zn）掺杂的SnO ₂球形纳米结构。通过使用X射线衍射，傅立叶变换红外光谱，紫外可见光谱和扫描电子显微镜研究，仔细分析了掺杂浓度对结构，光学，功能和形态特性的影响。XRD图谱表明已形成具有方形结构的锡石金红石型SnO ₂。在掺杂的SnO _2中未观察到对应于过渡金属掺杂剂的杂质峰样品。发现纯样品和掺Fe，Cu和Zn的样品的平均微晶尺寸分别为27.2、24.1、22.3和21.8 nm。EDX光谱和元素图谱评估了Sn，O，Fe，Cu和Zn物种的存在。SEM图像显示了合成的纯和TM掺杂样品的球形形态。X射线光电子能谱证实了Sn，Cu，Zn，Fe和O的电子状态和结合能。通过恒电流充放电，循环伏安法和电化学阻抗谱法评价了所制备电极的电化学性能。纳米Fe掺杂SnO ₂ 电极在0.5 A / g的电流密度下显示出270 F / g的有利比电容，并且在2000次充电放电循环中具有98％的保留率，具有出色的循环稳定性。