Sheet-like MoO₃ nanostructures with improved charge storage: Relationships among structural, optical, and electrochemical properties

Next Energy Pub Date : 2025-07-01 DOI:10.1016/j.nxener.2025.100352

A.P. Nagendra Babu , N. Pradeep , C.G. Renuka

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Abstract

The molybdenum trioxide (MoO₃) nanosheets were synthesized via thermal decomposition and thoroughly characterized for their structural, morphological, optical, and electrochemical properties. X-ray diffraction (XRD) confirmed orthorhombic phase purity with crystallite sizes of 69–97 nm. Raman and FTIR spectroscopy revealed key Mo–O and MoO vibrational modes, while X-ray photoelectron spectroscopy (XPS) confirmed oxidation states. Field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM) showed sheet-like morphology, and energy-dispersive X-ray spectroscopy (EDX) validated elemental composition. UV–vis spectroscopy indicated direct and indirect band gaps of 2.800–2.977 eV and 2.566–2.940 eV, respectively. Electrochemical performance, assessed via cyclic voltammetry (CV), galvanostatic charging-discharging (GCD), and electrochemical impedance spectrometry (EIS), demonstrated excellent capacitance (217.30 F/g), energy density (21.47 Wh/kg), and power density (2118.65 W/kg). When integrated into coin cells, MoO₃ nanosheets exhibited a specific capacitance of 48.39 F/g, with an energy density of 31.93 Wh/kg and power density of 2903.26 W/kg. These findings underscore their strong potential in advanced energy storage applications.

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具有改进电荷存储的片状MoO₃纳米结构：结构、光学和电化学性质之间的关系

采用热分解法制备了三氧化钼（MoO₃）纳米片，并对其结构、形态、光学和电化学性能进行了表征。x射线衍射（XRD）证实了晶型尺寸为69 ~ 97 nm的正交相纯度。拉曼光谱和FTIR光谱揭示了关键的Mo-O和MoO振动模式，而x射线光电子能谱（XPS）证实了氧化态。场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）显示出片状形貌，能量色散x射线光谱（EDX）验证了元素组成。紫外可见光谱显示直接带隙为2.800 ~ 2.977 eV，间接带隙为2.566 ~ 2.940 eV。通过循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗谱法（EIS）对电化学性能进行了评估，显示出优异的电容（217.30 F/g）、能量密度（21.47 Wh/kg）和功率密度（2118.65 W/kg）。当集成到硬币电池中，MoO₃纳米片的比电容为48.39 F/g，能量密度为31.93 Wh/kg，功率密度为2903.26 W/kg。这些发现强调了它们在先进储能应用中的巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Next Energy

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