Improvement of hydrothermally synthesized MnO2 electrodes on Ni foams via facile annealing for supercapacitor applications

Zhu, Tao; Zheng, Sijia; Chen, Y. G.; Luo, Jian; Guo, Haibo; Chen, Y. E.

doi:10.1007/s10853-014-8343-8

Cited by 44 publications

(13 citation statements)

References 28 publications

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“…The electrochemical properties of the MnO 2 /porous Ni wire electrode were first evaluated using a three‐electrode configuration in KOH aqueous solution ( Figure a). Clearly, all the cyclic voltammetry (CV) curves as a function of scan rate from 5 to 100 mV s −1 exhibit a roughly rectangular shape along with a couple of approximately symmetrical peaks at 0.11 and 0.17 V, respectively, similar to the literature results, which could arise from the intercalation/deintercalation of K + in the MnO 2 electrode in aqueous KOH . Furthermore, the galvanostatic charge/discharge (GCD) curve of the MnO 2 /porous Ni wire electrode at various current densities (Figure b) shows a triangular‐like shape, indicating good capacitive behavior of the electrode.…”

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confidence: 83%

A General Electrode Design Strategy for Flexible Fiber Micro‐Pseudocapacitors Combining Ultrahigh Energy and Power Delivery

Zhao

et al. 2017

Advanced Science

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Herein, a general strategy is proposed to boost the energy storage capability of pseudocapacitive materials (i.e., MnO2) to their theoretical limits in unconventional 1D fiber configuration by rationally designing bicontinuous porous Ni skeleton@metal wire “sheath–core” metallic scaffold as a versatile host. As a proof of concept, the 1D metallic scaffold supported‐MnO2 fiber electrode is demonstrated. The proposed “sheath” design not only affords large electrode surface area with ordered macropores for large electrolyte‐ion accessibility and high electroactive material loading, but also renders interconnected porous metallic skeleton for efficient electronic and ionic transport, while the metallic “core” functions as an extra current collector to promote long‐distance electron transport and electron collection. Benefiting from all these merits, the optimized fiber electrode yields unprecedented specific areal capacitance of 1303.6 mF cm−2 (1278 F g−1 based on MnO2, approaching the theoretical value of 1370 F g−1) in liquid KOH and 847.22 mF cm−2 in polyvinyl alcohol (PVA)/KOH gel electrolyte, 2–350 times of previously reported fiber electrodes. The solid‐state fiber micro‐pseudocapacitors simultaneously achieve remarkable areal energy and power densities of 18.83 µWh cm−2 and 16.33 mW cm−2, greatly exceeding the existing symmetric fiber supercapacitors, together with long cycle life and high rate capability.

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confidence: 83%

A General Electrode Design Strategy for Flexible Fiber Micro‐Pseudocapacitors Combining Ultrahigh Energy and Power Delivery

Zhao

et al. 2017

Advanced Science

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“…It will be difficult to increase the energy density since we have already mentioned that its experimental value is close to theoretical for the most advanced electrodes [200], but the power density can still be improved by working on the porosity of the electrode material. For this purpose, synergetic effects between the research on batteries and the research on supercapacitors is expected as porosity increases the effective surface area with the electrolyte, which implies an increase of the power density, provided that the solid-electrolyte interface (SEI) is well controlled; porosity is also desired for capacitive electrodes [201,202,203]. A capacitance larger than 200 F·g −1 has already been obtained with mesoporous MnO 2 nanosheets [204].…”

Section: Discussionmentioning

confidence: 99%

Nanostructured MnO2 as Electrode Materials for Energy Storage

2017

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Manganese dioxides, inorganic materials which have been used in industry for more than a century, now find great renewal of interest for storage and conversion of energy applications. In this review article, we report the properties of MnO2 nanomaterials with different morphologies. Techniques used for the synthesis, structural, physical properties, and electrochemical performances of periodic and aperiodic frameworks are discussed. The effect of the morphology of nanosized MnO2 particles on their fundamental features is evidenced. Applications as electrodes in lithium batteries and supercapacitors are examined.

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“…Therefore, further electrode preparation is still necessary for realizing their application in supercapacitors, which leads to additional cost and time. Furthermore, the MnO 2 / rGO powder were coated on the current collector (such as platinum, gold or titanium) with the assistance of binder (such as PVDF, PTFE) [23]. The high contact resistance between MnO 2 /rGO powder and current collector and the nonconductive binder would greatly decrease the rate capability and poor cycle stability of supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of MnO2/rGO/Ni composite foam with excellent pseudocapacitive behavior for supercapacitors

Sun

Zhang

et al. 2015

Journal of Alloys and Compounds

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Improvement of hydrothermally synthesized MnO2 electrodes on Ni foams via facile annealing for supercapacitor applications

Cited by 44 publications

References 28 publications

A General Electrode Design Strategy for Flexible Fiber Micro‐Pseudocapacitors Combining Ultrahigh Energy and Power Delivery

A General Electrode Design Strategy for Flexible Fiber Micro‐Pseudocapacitors Combining Ultrahigh Energy and Power Delivery

Nanostructured MnO2 as Electrode Materials for Energy Storage

Facile synthesis of MnO2/rGO/Ni composite foam with excellent pseudocapacitive behavior for supercapacitors

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