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绿色合成的掺锶二氧化钛纳米颗粒用于染料去除和超级电容器应用时增强的光催化和电化学性能。

Enhanced photocatalytic and electrochemical properties of green synthesized strontium doped titanium dioxide nanoparticles for dye removal and supercapacitor applications.

作者信息

Tasisa Yonas Etafa, Gunasekaran M, Sarma Tridib Kumar, Krishnaraj Ramaswamy, Arivanandhan M

机构信息

Department of Physics, College of Natural and Computational Sciences, Wollega University, 395, Nekemte, Ethiopia.

Department of Physics, College of Engineering, Anna University, Guindy, Chennai, 600025, India.

出版信息

Sci Rep. 2025 Mar 26;15(1):10452. doi: 10.1038/s41598-025-95111-w.

DOI:10.1038/s41598-025-95111-w
PMID:40140452
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11947302/
Abstract

The development of multifunctional nanomaterials for environmental remediation and energy storage is critical for sustainable technologies. In this study, we synthesized strontium-doped titanium dioxide (Sr-TiO) nanoparticles (NPs) via a green method and investigated their structural, optical, and electrochemical properties to enhance photocatalytic and supercapacitive performance. Characterization results confirmed successful Sr incorporation into the TiO lattice. X-ray diffraction (XRD) analysis revealed a slight shift in peak positions, indicating lattice distortion due to Sr doping. Scanning electron microscopy (SEM) showed uniform, well-dispersed nanoparticles, while energy-dispersive X-ray (EDX) spectra confirmed elemental composition. UV-visible spectroscopy (UV-Vis) demonstrated a redshift in absorption, reducing the bandgap and enhancing visible-light absorption. Fourier transform infrared (FTIR) spectroscopy identified characteristic functional groups, and Brunauer-Emmett-Teller (BET) analysis indicated increased surface area, favoring photocatalytic and electrochemical activity. The photocatalytic performance of Sr-TiO NPs was assessed through Methylene Orange (MO) and Congo Red (Con-R) degradation under visible light at different pH levels. Under optimized conditions, Sr-TiO NPs achieved 94.48% MO removal in 100 min and 97.89% Con-R removal in 70 min, following pseudo-first-order kinetics, demonstrating their efficiency as visible-light-driven photocatalysts for wastewater treatment. Electrochemical studies, including cyclic voltammetry (CV), charge-discharge tests, and electrochemical impedance spectroscopy (EIS), revealed improved charge storage and lower charge transfer resistance compared to bare TiO. The Sr-TiO NPs exhibited enhanced specific capacitance and good electrochemical stability, underscoring their potential as high-performance electrode materials for supercapacitors. These findings highlight a sustainable approach to environmental remediation and energy storage by leveraging Sr-doped TiO nanomaterials for dual-functional applications.

摘要

开发用于环境修复和能量存储的多功能纳米材料对可持续技术至关重要。在本研究中，我们通过绿色方法合成了锶掺杂二氧化钛（Sr-TiO）纳米颗粒（NPs），并研究了它们的结构、光学和电化学性质，以提高光催化和超级电容性能。表征结果证实成功将Sr掺入TiO晶格中。X射线衍射（XRD）分析显示峰位略有偏移，表明由于Sr掺杂导致晶格畸变。扫描电子显微镜（SEM）显示纳米颗粒均匀、分散良好，而能量色散X射线（EDX）光谱证实了元素组成。紫外可见光谱（UV-Vis）表明吸收发生红移，减小了带隙并增强了可见光吸收。傅里叶变换红外（FTIR）光谱确定了特征官能团，布鲁诺尔-埃米特-泰勒（BET）分析表明表面积增加，有利于光催化和电化学活性。通过在不同pH值下可见光照射下亚甲基橙（MO）和刚果红（Con-R）的降解来评估Sr-TiO NPs的光催化性能。在优化条件下，Sr-TiO NPs在100分钟内实现了94.48%的MO去除率，在70分钟内实现了97.89%的Con-R去除率，遵循准一级动力学，证明了它们作为可见光驱动光催化剂用于废水处理的效率。电化学研究，包括循环伏安法（CV）、充放电测试和电化学阻抗谱（EIS），表明与裸TiO相比电荷存储得到改善且电荷转移电阻降低。Sr-TiO NPs表现出增强的比电容和良好的电化学稳定性，突出了它们作为超级电容器高性能电极材料的潜力。这些发现强调了通过利用锶掺杂TiO纳米材料进行双功能应用来实现环境修复和能量存储的可持续方法。

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