Al-Ghamdi S A, Khasim Syed, Darwish A A A, Hamdalla Taymour A, Alsharif Marwah, Aljohani Meshari M, Hussain Mohammad, Fathihy K
Advanced Materials Research Laboratory, Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia.
Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia.
Heliyon. 2024 Sep 16;10(18):e37943. doi: 10.1016/j.heliyon.2024.e37943. eCollection 2024 Sep 30.
In this work, we demonstrated for the first time, use of Europium doped lanthanum silicate nanoparticles (LS NPs) as electrodes for supercapacitor applications. Europium (Eu) doped (5 mol%) LS NPs were synthesized by green solution combustion method using Mexican mint leaf extracts. Various analytical techniques such as High-Resolution Transmission Electron Microscopy (HRTEM), Selected Area Diffraction (SAED), Powder X-ray Diffraction (PXRD), Fourier Transform Infra-Red Spectroscopy (FTIR) and Diffuse Reflectance Spectroscopy (DRS) techniques were used to confirm the morphological and structural characteristics of the synthesized nanoparticles. The HRTEM and SAED patterns confirms the formation of NPs having agglomerated structure with a particle size less than 50 nm. The PXRD patterns reveals crystalline cubic structure for the NPs. Further, the FT-IR spectra reveal the successful doping of Europium in Lanthanum Silicate NPs. The DRS (Diffuse Reflectance Spectroscopy) studies confirm the reduced band gap for Europium (Eu) doped (5 mol%) LS NPs. Cyclic voltametric and electrochemical impedance spectroscopy experiments were performed in an alkaline medium to compare the electrochemical activity of Eu doped LS NPs with that of their undoped counterpart. The Eu doped (5 %) LS NPs electrodes attained a specific capacitance of 373.3 Fg at a current density of 0.5 Ag in comparison to pure LS NPs which is about 267 Fg. The long-term stability of the Eu doped (5 %) LS NPs electrodes show excellent stability up to 4000 cycles of operation in comparison pure LS NPs electrodes. Doping of Eu had a favourable effect on the conductivity and electrochemical activity of LS NPs. Due to favourable green combustion synthesis, superior electrochemical performance, these Eu doped LS NPs could be potential materials for new generation supercapacitors in energy storage applications.
在本研究中，我们首次展示了将铕掺杂的硅酸镧纳米颗粒（LS NPs）用作超级电容器电极。采用墨西哥薄荷叶提取物通过绿色溶液燃烧法合成了铕（Eu）掺杂（5摩尔%）的LS NPs。使用了各种分析技术，如高分辨率透射电子显微镜（HRTEM）、选区衍射（SAED）、粉末X射线衍射（PXRD）、傅里叶变换红外光谱（FTIR）和漫反射光谱（DRS）技术来确认合成纳米颗粒的形态和结构特征。HRTEM和SAED图案证实形成了具有团聚结构且粒径小于50 nm的纳米颗粒。PXRD图案显示纳米颗粒为晶体立方结构。此外，FT-IR光谱表明铕成功掺杂到硅酸镧纳米颗粒中。DRS（漫反射光谱）研究证实铕（Eu）掺杂（5摩尔%）的LS NPs的带隙减小。在碱性介质中进行循环伏安和电化学阻抗谱实验，以比较Eu掺杂的LS NPs与其未掺杂对应物的电化学活性。Eu掺杂（5%）的LS NPs电极在电流密度为0.5 A/g时的比电容达到373.3 F/g，相比之下纯LS NPs约为267 F/g。Eu掺杂（5%）的LS NPs电极的长期稳定性表明，与纯LS NPs电极相比，在高达4000次循环操作中具有优异的稳定性。Eu的掺杂对LS NPs的导电性和电化学活性有有利影响。由于有利的绿色燃烧合成、优异的电化学性能，这些Eu掺杂的LS NPs可能成为储能应用中新一代超级电容器的潜在材料。
