Fabrication of flexible micro-supercapacitor array with patterned graphene foam/MWNT-COOH/MnO  electrodes and its application

Moon, Young Sun; Kim, Daeil; Lee, Geumbee; Hong, Soo Yeong; Kim, Kuk Ki; Park, Seung Min; Ha, Jeong Sook

doi:10.1016/j.carbon.2014.09.018

Cited by 76 publications

(33 citation statements)

References 55 publications

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“…Specifically, carbon materials such as CNTs, carbon spheres, carbon nanofibers, activated carbon, and amorphous carbon matrix have been reported to provide the desired support for MnO x materials for supercapacitor applications. Among these carbon materials, CNTs are the most reported, as they not only act as supporting backbone but also contribute to the overall electrical conductivity of the hybrid materials.…”

Section: Mnox‐based Hybrid Electrodes For Supercapacitorsmentioning

confidence: 99%

“…Graphene or reduced graphene oxide (rGO) is the most studied carbon‐based material for combination with MnO x for supercapacitor electrodes in the past decade . The highly conductive graphene nanosheets can be easily integrated into macroscopic level such as graphene paper, graphene hydrogels, and graphene foam‐based electrodes .…”

Section: Mnox‐based Hybrid Electrodes For Supercapacitorsmentioning

confidence: 99%

“…As mentioned above, like several other transition metal oxides, one of the main obstacles in achieving high capacitance with MnO x ‐based materials is their poor electrical conductivity (10 −3 –10 −4 S m −1 ). Recent studies have focused on two approaches to improve their electrical conductivity: growth of MnO x on conducting substrates such as carbon substrates and metal foams, and doping with other metal elements such as Cu, Ni, Co, and Fe, which will be covered in detail in the following sections.…”

Section: Introductionmentioning

confidence: 99%

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Manganese‐Oxide‐Based Electrode Materials for Energy Storage Applications: How Close Are We to the Theoretical Capacitance?

Wang

2018

Advanced Materials

100

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Of the transition metals, Mn has the greatest number of different oxides, most of which have a special tunnel structure that enables bulk redox reactions. The high theoretical capacitance and capacity results from a greater number of accessible oxidation states than other transition metals, wide potential window, and the high natural abundance make MnO species promising electrode materials for energy storage applications. Although MnO electrode materials have been intensely studied over the past decade, their electrochemical performance is still insufficient for practical applications. Currently, there is a trade-off between specific capacitance and loading mass. MnO species have intrinsically poor electrical conductivity, and current structural designs are not sophisticated enough to accommodate enough redox-active sites. Recent studies have certainly made progress in increasing capacitance through making use of electrically conductive components and controlling the morphology of the MnO species to expose more surface area. To increase the capacitance of MnO electrodes to the largest extent without limiting loading mass, further structural design at the nanoscale and manipulation of the electrically conductive component are required. An ideal nanostructure is proposed to guide future research toward closing the gap between achieved and theoretical capacitance, without limiting the loading mass.

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Section: Mnox‐based Hybrid Electrodes For Supercapacitorsmentioning

confidence: 99%

Section: Mnox‐based Hybrid Electrodes For Supercapacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Manganese‐Oxide‐Based Electrode Materials for Energy Storage Applications: How Close Are We to the Theoretical Capacitance?

Wang

2018

Advanced Materials

100

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“…As shown in Figure 4 a, the CV curves of the ten-layer SRARS supercapacitor (unless specifi c note, we use ten-layer supercapacitor for the following tests) show a nearly symmetrical rectangular shape at a series of scan rate (from 20 to 500 mV s −1 ) and this good rectangular shape even retained at a high scan rate of 500 mV s −1 , which indicates the good electrochemical performance of the SRARS supercapacitor. [ 28 ] Figure 4 b depicts the galvanostatic chargedischarge curve of SRARS supercapacitor between 0 and 1.0 V at the current density of 0.5 A g −1 . The curves are close to triangular shape, confi rming the formation of a typical electric double-layer capacitor (EDLC).…”

Section: Resultsmentioning

confidence: 99%

“…[ 13,20,28 ] Here, we propose a modifi ed novel 3D interdigital electrode structures (as shown in Figure 6 ) to enhance the performance of supercapacitors in order to meet the practical demands and simplify the fabrication technique to facilitate the industrial production. All the procedures were carried out by low-cost industrial equipment with very simple steps, which was demonstrated in the previous text.…”

Section: Resultsmentioning

confidence: 99%

Stretchable Supercapacitor with Adjustable Volumetric Capacitance Based on 3D Interdigital Electrodes

Chen

Wang

et al. 2015

Adv Funct Materials

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4601wileyonlinelibrary.com fabricate, [ 14 ] has shown good performance as electrodes in energy harvesting/storage devices, such as solar cells, [15][16][17] secondary batteries, [ 18 ] and especially supercapacitors. [ 8,[10][11][12] Combined with the solution preparation and the fl exibility, rGO has already been expected as a competitive alternative for the next-generation fl exible supercapacitors.Despite being one kind of the ideal electrode materials, the present rGO-based materials are restricted by unsatisfactory volumetric capacitance in fl exible devices. On the one hand, the specifi c capacitance of rGO is not high (generally 50-200 F g −1 ), which depends on the electrical double layer at the interface between electrode and electrolyte. [ 19 ] On the other hand, the large inert space in practical devices (large volume ratio of encapsulation layers in the device) also accounts for the low volumetric energy density. [ 9 ] These two points have plagued the integration of rGO-based fl exible supercapacitors into roll-up displays, wearable device or other fl exible microdevices. Therefore, researchers are striving to fi nd new feasible method for preparing rGO-based electrodes with satisfactory electrochemical performance, including high volumetric capacitance and long cycle life. Previously, we fabricated fl exible microsupercapacitor with well-ordered conducting polymer nanostructures on rGO interdigital electrodes to enhance the specifi c capacitance through synergistic effect. [ 20 ] This high-performance microsupercapacitor provides a promising power source whose reliability and performance might meet the energy demands of the next-generation miniaturized electronic devices, especially fl exible devices. More recently, some feasible methods have also been studied by other research groups. For example, 3D interpenetrating graphene electrodes have been fabricated by electrochemical reduction of GO for ultrahigh rate supercapacitors; [ 21 ] Gao co-workers proposed a coaxial wet-spinning assembly approach to continuously spin polyelectrolyte-wrapped graphene/CNT core-sheath yarns and the yarn-based supercapacitors showed a capacitance of 177 mF cm −2 in solid electrolyte (SE); [ 22 ] carbon microfi bers made of aligned single-walled carbon nanotubes (SWCNTs) and nitrogen-doped rGO sheets are produced and show a specifi c volumetric capacity of 300 F cm −3 in polyvinyl alcohol (PVA)/ H 3 PO 4 electrolyte; [ 23 ] to further improve the capacitance, metal oxides, and conducting polymer are introduced to composite with carbon materials. [ 24,25 ] These modifi cations show valuable characteristics in enhancing the performance, especially the specifi c capacitance; Stretchable Supercapacitor with Adjustable Volumetric Capacitance Based on 3D Interdigital ElectrodesFengwang Li , Jitao Chen , * Xusheng Wang , Mianqi Xue , * and G. F. Chen Reduced graphene oxide (rGO)-based materials have shown good performance as electrodes in fl exible energy storage devices owing to their physical properties, high specifi c ...

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Stretchable Supercapacitors

Shen

2022

Flexible Supercapacitors

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Fabrication of flexible micro-supercapacitor array with patterned graphene foam/MWNT-COOH/MnO electrodes and its application

Cited by 76 publications

References 55 publications

Manganese‐Oxide‐Based Electrode Materials for Energy Storage Applications: How Close Are We to the Theoretical Capacitance?

Manganese‐Oxide‐Based Electrode Materials for Energy Storage Applications: How Close Are We to the Theoretical Capacitance?

Stretchable Supercapacitor with Adjustable Volumetric Capacitance Based on 3D Interdigital Electrodes

Stretchable Supercapacitors

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