Temperature-dependent synthesis of Mn3O4 nanostructures by microwave irradiation method for high-performance supercapacitors,International Journal of Energy Research

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Temperature-dependent synthesis of Mn3O4 nanostructures by microwave irradiation method for high-performance supercapacitors
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-09-19 , DOI: 10.1002/er.7284
Sreekanth T. V. M. ₁ , Yoo Kisoo ₂ , Jonghoon Kim ₁

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Nanostructured Mn₃O₄ electrodes were synthesized via a simple and rapid one-step microwave irradiation route, using manganese (II) nitrate hexahydrate and hydrazine hydrate. Four different morphologies (plate-like, hexagonal-like, rice-like, and sphere-like) were obtained by changing the reaction temperature such as 125°C, 150°C, 175°C, and 200°C (denoted as Mn-125, Mn-150, Mn-175, and Mn-200). Various analytical techniques such as X-ray diffraction, Brunauer-Emmett-Teller, Raman, X-ray photoelectron spectroscopy, scanning electron microscope, and high-resolution transmission electron microscopy analysis were utilized to characterize the physicochemical properties of the prepared electrodes. The average crystallite sizes of the Mn-125, Mn-150, Mn-175, and Mn-200 samples were ~32.3, ~28.8, ~31.7, and ~28.9 nm, respectively. To evaluate the electrochemical properties of the Mn₃O₄ nanostructures for supercapacitors, cyclic voltammetry and galvanostatic charge/discharge measurements were performed. Remarkably, the hexagonal-like Mn₃O₄ electrode showed a higher specific capacitance of 449.98 F g⁻¹ at a lower current density of 1 A g⁻¹ and showing outstanding cyclic permanence (95% capacitance retention 5000 cycles) than the other nanostructures.

中文翻译：

微波辐照法温度依赖性合成Mn3O4纳米结构用于高性能超级电容器

纳米结构的 Mn ₃ O ₄使用六水合硝酸锰 (II) 和水合肼，通过简单快速的一步微波辐射路线合成电极。通过改变反应温度如 125°C、150°C、175°C 和 200°C（记为 Mn -125、Mn-150、Mn-175 和 Mn-200)。利用各种分析技术，如 X 射线衍射、Brunauer-Emmett-Teller、拉曼、X 射线光电子能谱、扫描电子显微镜和高分辨率透射电子显微镜分析来表征所制备电极的物理化学性质。Mn-125、Mn-150、Mn-175 和 Mn-200 样品的平均微晶尺寸分别为 ~32.3、~28.8、~31.7 和 ~28.9 nm。_{进行了用于超级电容器的3} O ₄纳米结构、循环伏安法和恒电流充电/放电测量。值得注意的是，与其他纳米结构相比，六角形 Mn ₃ O _{4电极在 1 A g}^-1的较低电流密度下显示出 449.98 F g ^-1的更高比电容，并显示出出色的循环持久性（95% 电容保持 5000 次循环） .

更新日期：2021-09-19

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