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用于高电化学性能超级电容器的α-MnMoO纳米棒的微波水热合成

Microwave hydrothermal synthesis of α-MnMoO nanorods for high electrochemical performance supercapacitors.

作者信息

Jayasubramaniyan S, Balasundari S, Rayjada P A, Satyanarayana N, Muralidharan P

机构信息

Research and Development Centre, Bharathiar University Coimbatore-641046 India.

Centre for Advanced Materials Engineering Research and Application, (CAMERA), Department of Chemistry, Rajiv Gandhi College of Engineering and Technology Kirumampakkam Puducherry-607403 India

出版信息

RSC Adv. 2018 Jun 20;8(40):22559-22568. doi: 10.1039/c8ra02751j. eCollection 2018 Jun 19.

DOI:10.1039/c8ra02751j
PMID:35539715
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9081451/
Abstract

Pristine α-MnMoO nanorods were facilely prepared co-precipitation (Cp) and microwave hydrothermal (MH) methods. X-ray diffraction (XRD) patterns showed pure monoclinic crystalline phase α-MnMoO for the heat treated powder at 500 °C. Fourier Transform Infrared (FTIR) spectra showed that the chemical bond structure of α-MnMoO corresponds to the strong vibrational modes of Mo-O-Mo, Mo-O and Mo[double bond, length as m-dash]O. Raman spectra showed the structural bonding and crystalline nature of α-MnMoO. Field Emission Scanning Electron Microscope (FE-SEM) images exposed the nanorod shape of the α-MnMoO powder, with diameters of ∼200 nm and lengths of ∼1.6 μm. Electrochemical studies of the Cp- and MH-MnMoO nanorods with 2 M NaOH as the electrolyte showed specific capacitances of 143 F g and 551 F g, respectively, at a 1 A g constant discharge current density. Cyclic voltammetric (CV) studies of the MH-MnMoO nanorods at various scan rates revealed the presence of redox pairs, suggesting a pseudocapacitive nature. The structural stability at different current densities demonstrated the high rate performances and good reversible capacity retention of the calcined MH-MnMoO nanorods. A cycling life stability study of MH-MnMoO demonstrated a good capacity retention of 89% of the initial specific capacitance at 5 A g after 1000 cycles.

摘要

通过共沉淀（Cp）法和微波水热（MH）法轻松制备了纯净的α-MnMoO纳米棒。X射线衍射（XRD）图谱显示，500℃热处理后的粉末为纯单斜晶相α-MnMoO。傅里叶变换红外（FTIR）光谱表明，α-MnMoO的化学键结构对应于Mo-O-Mo、Mo-O和Mo=O的强振动模式。拉曼光谱显示了α-MnMoO的结构键合和晶体性质。场发射扫描电子显微镜（FE-SEM）图像显示了α-MnMoO粉末的纳米棒形状，直径约为200nm，长度约为1.6μm。以2M NaOH为电解质对Cp-MnMoO和MH-MnMoO纳米棒进行的电化学研究表明，在1A g的恒定放电电流密度下，比电容分别为143F g和551F g。对MH-MnMoO纳米棒在不同扫描速率下进行的循环伏安（CV）研究揭示了氧化还原对的存在，表明其具有赝电容性质。在不同电流密度下的结构稳定性证明了煅烧后的MH-MnMoO纳米棒具有高倍率性能和良好的可逆容量保持率。对MH-MnMoO进行的循环寿命稳定性研究表明，在5A g下经过1000次循环后，其容量保持率良好，为初始比电容的89%。

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