Direct growth of Ni–Mn–O nanosheets on flexible electrospun carbon nanofibers for high performance supercapacitor applications

Tian, Di; Lu, Xiaofeng; Nie, Guangdi; Gao, Mu; Wang, Ce

doi:10.1039/c7qi00696a

Cited by 62 publications

(18 citation statements)

References 45 publications

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“…The SAED pattern of Ni 0.75 Mn 0.25 O/C nanosheets and nickel nanoparticles presents as eries of diffraction rings (Figures 3j and (Figure 4a). [47] Notably,t he CV curve of the 3D-Ni/Ni-Mn-O electrode shows one more reduction peak at approximately 0.32 V, which may result from the 3D-Ni substrate due to the high-temperature annealing of the 3D Ni(OH) 2 /Ni foam. [48,49] The integrated area of the CV curve of the 3D-Ni/Ni-Mn-O electrode is much larger than those of the other electrodes, indicating its superiora realcapacitance.…”

Section: Resultsmentioning

confidence: 96%

“…Figure compares the electrochemical performances of the three solid‐solution electrodes in a three‐electrode system with aqueous KOH solution as the electrolyte, a Pt foil served as the counter electrode, and Hg/HgO as the reference electrode. At a scan rate of 30 mV s −1 within the potential window of 0–0.6 V, the redox peaks of Ti‐foil/Ni 0.75 Mn 0.25 O/C (Ti‐F/Ni‐Mn‐O), Ni‐foam/Ni 0.75 Mn 0.25 O/C (Ni‐F/Ni‐Mn‐O), and 3D‐Ni/Ni 0.75 Mn 0.25 O/C (3D‐Ni/Ni‐Mn‐O) are 0.55/0.35, 0.56/0.34, and 0.51/0.22 V versus the standard calomel electrode (SCE), respectively, corresponding to a pseudocapacitive response of M‐O/M‐O‐O‐H (M represents Ni and Mn ions) arising from reversible Faradaic reactions as shown in their CV curves (Figure a) . Notably, the CV curve of the 3D‐Ni/Ni‐Mn‐O electrode shows one more reduction peak at approximately 0.32 V, which may result from the 3D‐Ni substrate due to the high‐temperature annealing of the 3D Ni(OH) 2 /Ni foam .…”

Section: Resultsmentioning

confidence: 99%

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In Situ Growth of Hierarchical Ni‐Mn‐O Solid Solution on a Flexible and Porous Ni Electrode for High‐Performance All‐Solid‐State Asymmetric Supercapacitors

Yang³

et al. 2019

Chemistry A European J

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To endow all‐solid‐state asymmetric supercapacitors with high energy density, cycling stability, and flexibility, we design a binder‐free supercapacitor electrode by in situ growth of well‐distributed broccoli‐like Ni0.75Mn0.25O/C solid solution arrays on a flexible and three‐dimensional Ni current collector (3D‐Ni). The electrode consists of a bottom layer of compressed but still porous Ni foam with excellent flexibility and high electrical conductivity, an intermediate layer of interconnected Ni nanoparticles providing a large specific surface area for loading of active substances, and a top layer of vertically aligned mesoporous nanosheets of a Ni0.75Mn0.25O/C solid solution. The resultant 3D‐Ni/Ni0.75Mn0.25O/C cathode exhibits a specific capacitance of 1657.6 mF cm−2 at 1 mA cm−2 and shows no degradation of the capacitance after 10 000 cycles at 3 mA cm−2. The assembled 3D‐Ni/Ni0.75Mn0.25O/C//activated carbon asymmetric supercapacitor has a high specific capacitance of 797.7 mF cm−2 at 2 mA cm−2 and an excellent cycling stability with 85.3 % of capacitance retention after 10 000 cycles at a current density of 3 mA cm−2. The energy density and power density of the asymmetric supercapacitor are up to 6.6 mW h cm−3 and 40.8 mW cm−3, respectively, indicating a fairly promising future of the flexible 3D‐Ni/Ni0.75Mn0.25O/C electrode for efficient energy storage applications.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

In Situ Growth of Hierarchical Ni‐Mn‐O Solid Solution on a Flexible and Porous Ni Electrode for High‐Performance All‐Solid‐State Asymmetric Supercapacitors

Yang³

et al. 2019

Chemistry A European J

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“…Researchers are striving to develop a novel structure of aeolotropic conductive pellicle to achieve electrical conduction in specific directions of the film surface and multifunctionality to meet the needs of the rapid development of electronics and nanotechnology. The conductive materials are usually prepared by heat pressing [26], ultrasonic welding [27] or electrospinning [28][29][30][31][32][33][34][35]. Among these techniques, electrospinning is a simple and economical method to prepare nano-materials with various properties due to its convenient preparation process and good repeatability.…”

Section: Introductionmentioning

confidence: 99%

2D double aeolotropic conductive Janus pellicle with multi-functionality then derived 3D dual-wall Janus-type tube

Qi¹,

Do²,

Xie³

et al. 2020

Express Polym. Lett.

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bilayer Janus pellicle (denoted as BJP) of concurrent double aeolotropic electrical conduction, superparamagnetism and luminescence is designed and constructed via electrospinning by using one-dimensional (1D) nanofibers and Janus nanoribbons as constructive units. The BJP comprises top-down two layers tightly bonded together. The top layer is a left-right structured Janus film which consists of Janus nanoribbons array as left and right side, and further, arrangement orientations of Janus nanoribbons in the two sides are perpendicular, leading to double aeolotropic conduction, and the conduction ratio reaches 10 8 times. The down layer is a non-array luminescent film made of nanofibers. Under the excitation by 291 and 294 nm light, red luminescence of the left side of the top layer and green luminescence of down layer in BJP are respectively achieved. The maximum saturation magnetization of the top layer can reach 21.45 (emu/g). By rolling the 2D BJP into the tube respectively with the ways of rolling from left to right or from up to down, three-dimensional (3D) dual-wall Janus-type tube with the Janus-type tube as outer or inner and the homogeneous tube as inner or outer is obtained.

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“…Electrode materials for supercapacitors should store the charge stably without structural transition and exhibit two or more oxidation states and high electroconductivity. Transition metal oxides are suitable due to their multi-oxidation states that enable the charge transfer via oxygen reduction, facilitating multiple-electron transfer and good structural stability [5,6]. In addition, transition metal oxides have been considered as electrode materials in various electrochemical devices due to their high electrical conductivity and rich redox activity compared with the two corresponding single-component oxides [7].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Three-Dimensional Perovskite NiMnO3 Oxide and Application in Supercapacitor Electrode

et al. 2019

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Supercapacitors are attractive as a major energy storage device due to their high coulombic efficiency and semi-permanent life cycle. Transition metal oxides are used as electrode material in supercapacitors due to their high conductivity, capacitance, and multiple oxidation states. Nanopowder transition metal oxides exhibit low specific surface area, ion diffusion, electrical conductivity, and structural stability compared with the three-dimensional (3D) structure. Furthermore, unstable performance during long-term testing can occur via structural transition. Therefore, it is necessary to synthesize a transition metal oxide with a high specific surface area and a stable structure for supercapacitor application. Transition metal oxides with a perovskite structure control structural transition and improve conductivity. In this study, a NiMnO3 perovskite oxide with a high specific surface area and electrochemical properties was obtained via hydrothermal synthesis at low temperature. Hydrothermal synthesis was used to fabricate materials with an aqueous solution under high temperature and pressure. The shape and composition were regulated by controlling the hydrothermal synthesis reaction temperature and time. The synthesis of NiMnO3 was controlled by the reaction time to alter the specific surface area and morphology. The prepared perovskite NiMnO3 oxide with a three-dimensional structure can be used as an active electrode material for supercapacitors and electrochemical catalysts. The prepared NiMnO3 perovskite oxide showed a high specific capacitance of 99.03 F·g−1 and excellent cycle stability with a coulombic efficiency of 77% even after 7000 cycles.

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Direct growth of Ni–Mn–O nanosheets on flexible electrospun carbon nanofibers for high performance supercapacitor applications

Abstract: Ni–Mn–O nanosheets on flexible electrospun carbon nanofibers have been fabricated as binder-free supercapacitor electrodes, showing good performance for supercapacitor applications.

Cited by 62 publications

References 45 publications

In Situ Growth of Hierarchical Ni‐Mn‐O Solid Solution on a Flexible and Porous Ni Electrode for High‐Performance All‐Solid‐State Asymmetric Supercapacitors

In Situ Growth of Hierarchical Ni‐Mn‐O Solid Solution on a Flexible and Porous Ni Electrode for High‐Performance All‐Solid‐State Asymmetric Supercapacitors

2D double aeolotropic conductive Janus pellicle with multi-functionality then derived 3D dual-wall Janus-type tube

Hydrothermal Synthesis of Three-Dimensional Perovskite NiMnO3 Oxide and Application in Supercapacitor Electrode

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