Interfacial electrochemical investigation of 3D space-confined MnFe2O4 for high-performance ionic liquid-based supercapacitors
Interfacial electrochemical investigation of 3D space-confined MnFe2O4 for high-performance ionic liquid-based supercapacitors
复制标题
用于高性能离子液体超级电容器的 3D 空间限制 MnFe2O4 的界面电化学研究
DOI：
10.1016/j.electacta.2019.135386
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发表时间：
2020-01
影响因子：
6.6
通讯作者：
Lian Gao
中科院分区：
文献类型：
--
作者：
Cheng Yang;Minjie Shi;Yanna Nuli;Xuefeng Song;Liping Zhao;Jing Liu;Peng Zhang;Lian Gao
虽然MnFe 2 O 4因其双原子协同效应和费米能级电子占据态而被认为是水溶液电解质中性能上级的超级电容器电极，但由于MnFe 2 O 4电极在高粘度离子液体电解质中的界面电化学行为不佳，使得离子液体基超级电容器电极的研究受到阻碍。本文提出了一种三维空间受限MnFe 2 O 4电极（3DSC-MFQD），并对其在高压离子液体电解液中的界面电化学行为进行了深入研究。首次研究了离子注入电极表面Stern/扩散层的形成机理。电位驱动的离子积累的研究深入阐明了IL离子和电极之间具有丰富的活性位点，可以很容易地与EMIM+阳离子的带正电荷的咪唑环的电子云重叠的强烈的特征吸附。更强的吸附改善了3DSC-MFQD的界面电化学行为（3.374 × 10− 8 m2/s的高扩散系数），提供了3DSC-MFQD的高度可逆的氧化还原反应，从而导致3DSC-MFQD电极的耐用结构。在此基础上，制备了基于离子凝胶电解质的高能量/功率密度柔性太阳能电池，并将其作为具有实际应用价值的高效柔性储能器件。
Although MnFe2O4is regarded as superior supercapacitors (SCs) electrodes in aqueous electrolytes owing to its diatomic synergistic effect and electron-occupied states at Fermi level, researches on MnFe2O4electrodes for ionic liquid (IL)-based SCs which can easily achieve high energy densities, are still hindered because of mediocre interfacial electrochemical behaviors of MnFe2O4electrodes in IL electrolyte with high viscosity. Herein we propose a 3D space-confined MnFe2O4electrode (denoted as 3DSC-MFQDs) and conduct in-depth research on its interfacial electrochemical behaviors in high-voltage IL electrolyte. The formation mechanism of the Stern/diffusion layer of IL ions near electrode surface has been studied for the first time. Investigation of potential-driven ion accumulation deeply elucidates strong characteristic adsorption between IL ions and electrode with abundant active sites which can easily overlap with the electron cloud of positively charged imidazole rings of EMIM+cations. Stronger adsorption improves the interfacial electrochemical behavior of 3DSC-MFQDs (high diffusion coefficient of 3.374 × 10−8m2/s), providing highly-reversible redox reaction of 3DSC-MFQDs and thus leading to durable structures of 3DSC-MFQDs electrode. On this basis, flexible SCs (FSCs) with high energy/power density based on ionogel electrolyte are fabricated and act as efficient flexible energy storage devices for practical applications.
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氮掺杂石墨烯片上喷洒MnFe2O4量子点：高性能超级电容器电极的形成机制及应用
影响因子：
11.9
作者：
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影响因子：
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作者：
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影响因子：
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影响因子：
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作者：
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