Synthesis and comparison of amorphous and crystalline zinc molybdate by an electrochemical evaluation for supercapacitor application

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-05-12 DOI:10.1016/j.mseb.2025.118382

Armin Moradjoui Hamedani , Rasoul Sarraf-Mamoory , Mohammad Gol Mohammad

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Abstract

This study explores the synthesis and electrochemical performance of amorphous and crystalline zinc molybdate (ZnMoO₄) as supercapacitor electrode materials. ZnMoO₄ was synthesized via in situ electrochemical deposition on nickel foam using sodium molybdate and zinc nitrate. Structural and morphological characteristics were analyzed using XRD, FTIR, Raman spectroscopy, ultraviolet–visible spectroscopy (UV–Vis), and FE-SEM. Electrochemical performance was evaluated in 6 M KOH using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). Crystalline ZnMoO₄ exhibited a 21 % higher specific capacitance and superior cycling stability, retaining 97.22 % of its capacitance after 1000 cycles, compared to 94.6 % for the amorphous counterpart. The enhanced performance is attributed to higher crystallinity, lower resistance, and improved ion transport. A pseudocapacitive energy storage mechanism was confirmed. These findings highlight crystalline ZnMoO₄ as a promising electrode material for high-performance supercapacitors, emphasizing the role of crystallinity in optimizing energy storage.

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非晶钼酸锌和结晶钼酸锌的合成及其在超级电容器应用中的电化学评价比较

本研究探讨了非晶和结晶钼酸锌（ZnMoO4）作为超级电容器电极材料的合成及其电化学性能。以钼酸钠和硝酸锌为原料，在泡沫镍上原位电化学沉积合成了ZnMoO4。采用XRD、FTIR、拉曼光谱、紫外可见光谱（UV-Vis）和FE-SEM等分析了其结构和形态特征。采用循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗谱法（EIS）对6 M KOH溶液中的电化学性能进行了评价。晶体ZnMoO4比电容高21%，循环稳定性好，在1000次循环后保持97.22%的电容，而非晶ZnMoO4的循环稳定性为94.6%。增强的性能是由于更高的结晶度、更低的电阻和离子传输的改善。证实了一种伪电容储能机制。这些发现突出了晶体ZnMoO4作为高性能超级电容器极材料的前景，强调了结晶度在优化能量存储中的作用。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.