Vertically-aligned graphene@Mn<sub>3</sub>O<sub>4</sub> nanosheets for a high-performance flexible all-solid-state symmetric supercapacitor

Liao, Qingyu; Li, S. Y.; Cui, Hao; Wang, Chengxin

doi:10.1039/c6ta02258h

Cited by 65 publications

(24 citation statements)

References 26 publications

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“…This value is among the best in literature reports as summarized in Table S2 (Supporting Information). For instance, Jiang et al reported 322 F g −1 on Mn 3 O 4 powder based devices, Nagamuthu et al obtained 522 F g −1 on Mn 3 O 4 /activated carbons, Yang et al reported 517 F g −1 on Mn 3 O 4 /reduced graphene oxides, and Liao et al obtained a capacitance as high as 670 F g −1 (1 mV s −1 ) on carbon fabric/vertically aligned graphene/Mn 3 O 4 . However, as aforediscussed, binder materials, conductive additives, and metal current collectors are commonly used in electrode fabrication.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, flexible carbon fiber cloths were used as alternative electrode supports. Vertically aligned CNTs/MnO 2 and graphene sheets/Mn 3 O 4 grown on carbon cloth provide full cell capacitances of 51 and 140.5 F g −1 , respectively. Nevertheless, those capacitance values are calculated based on the net mass of active materials without considering the heavy mass of carbon fabric (780 mg cm −3 ) and additives, which cannot truly reflect the overall capacitance of the electrode.…”

Section: Introductionmentioning

confidence: 99%

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Ultralight and Binder‐Free All‐Solid‐State Flexible Supercapacitors for Powering Wearable Strain Sensors

Liu

et al. 2017

Adv Funct Materials

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Flexible energy storage devices play a pivotal role in realizing the full potential of flexible electronics. This work presents high-performance, allsolid-state, flexible supercapacitors by employing an innovative multilevel porous graphite foam (MPG). MPGs exhibit superior properties, such as large specific surface area, high electric conductivity, low mass density, high loading efficiency of pseudocapacitive materials, and controlled corrugations for accommodating mechanical strains. When loaded with pseudocapacitive manganese oxide (Mn 3 O 4 ), the MPG/Mn 3 O 4 (MPGM) composites achieve a specific capacitance of 538 F g −1 (1 mV s −1 ) and 260 F g −1 (1 mV s −1 ) based on the mass of pure Mn 3 O 4 and entire electrode composite, respectively. Both are among the best of Mn 3 O 4 -based supercapacitors. The MPGM is mechanically robust and can go through 1000 mechanical bending cycles with only 1.5% change in electric resistance. When integrated as all-solid-state symmetric supercapacitors, they offer a full cell specific capacitance as high as 53 F g −1 based on the entire electrode and retain 80% of capacitance after 1000 continuous mechanical bending cycles. Furthermore, the all-solid-state flexible supercapacitors are incorporated with strain sensors into self-powered flexible devices for detection of both coarse and fine motions on human skins, i.e., those from finger bending and heart beating.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultralight and Binder‐Free All‐Solid‐State Flexible Supercapacitors for Powering Wearable Strain Sensors

Liu

et al. 2017

Adv Funct Materials

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“…[202] Meanwhile, 3D graphene has been used as scaffolds for direct growth of transition metal based materials because of their unique interconnected macroporous structure, high specific areas, lightweight and flexible mechanical properties. [101,146,[203][204][205][206][207][208][209][210] The hydrophilic functional groups on the surface of 3D graphene help to obtain a compact growth of the transition metal compounds on the graphene surface.…”

Section: Electrode/electrolyte Interfacementioning

confidence: 99%

Boosting the cycling stability of transition metal compounds-based supercapacitors

Wang

Chen

et al. 2019

Energy Storage Materials

517

218

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Boosting the cycling stability of transition metal compoundsbased supercapacitors, Energy ABSTRACT As an important electrochemical energy storage system, supercapacitors (SCs) possess advantages of high power density, long cycling life and great safety to meet the requirements of particular applications. Current commercial SCs that are mainly based on activated carbon materials generally have low energy density. Development of alternative electrode materials with a high specific capacitance is critical to achieving a high energy density of SCs. In the past decades, transition metal compounds have been explored as promising electrode materials for SCs with high energy density by taking advantage of faradaic charge storage process of transition metal cations. Nevertheless, SCs with transition metal based electrode materials normally suffer sluggish electrochemical reaction kinetics and poor electron conductivity, which result in unsatisfactory cycling stability and rate capability. In this review, we focus on the analysis of recent research breakthroughs in the development of high electrochemical performance SCs using transition metal oxides/hydroxides, sulfides, selenides and phosphides. The majority of the devices demonstrated outstanding cycling lifetime of over 10,000 times and excellent capacity retention rate along with high energy density. A critical analysis of the factors that contribute to the electrochemical performance of these star-performing SCs such as material morphology, crystal structure, composition, interfacial properties and key chemical reactions are presented. This timely review sheds light on the most effective possible paths towards design and fabrication of high performance SCs using transition metal electrode materials.

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“…For instance, carbonaceousm aterials (e.g., carbon black, polyacrylonitrile and polypyrrole) have been employeda st he conductive matrix/host to improvet he electrical conductivity of Li 2 Sa nd enhanceg ood electrochemical performance. Moreover, the strong p-p interactions and the van der Waals force between the planar basal planes would cause restacking of the rGO, [40][41][42] greatly reducing the active sites and transfer channels for ions/electrons. [35][36][37][38] Wu et al prepared reduced grapheme oxide (rGO)-Li 2 Sc omposites through av ersatile solution-based method and achieved pronounced electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Vertical‐Aligned Li₂S–Graphene Encapsulated within a Carbon Shell as a Free‐Standing Cathode for Lithium–Sulfur Batteries

Wang

Xia

Wang

et al. 2017

Chemistry A European J

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Construction of a novel matrix with both high conductivity and an excellent confinement effect for polysulfides is of great importance for developing high-performance lithium-sulfur (Li-S) batteries. In this work, we have developed a double-modification strategy to integrate lithium sulfide (Li S) into a conductive composite network consisting of vertical graphene (VG) arrays and an amorphous carbon shell, forming an integrated cathode (VG/Li S-C). Facile liquid-solution/evaporation methods in combination with chemical vapor deposition were successfully adopted for preparation of the above cathode. Due to the enhanced electrical conductivity and noticeable blocking effect for the shuttle of polysulfides, the binder-free flexible VG/Li S-C cathode exhibits high rate performance and reinforced cycles (656.2 mAh g after 100 cycles). The pronounced electrochemical performance is ascribed to the unique architecture with a coherent conductive network of VG and the carbon shell, which not only provides a conductive network for fast reaction kinetics, but also forms a durable protective shield to suppress the shuttle of polysulfides. Our research further demonstrates the synergistic effectiveness by means of inner and outer carbon matrixes for electrochemical enhancement of Li-S batteries.

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Vertically-aligned graphene@Mn₃O₄ nanosheets for a high-performance flexible all-solid-state symmetric supercapacitor

Abstract: We have made a supercapacitor electrode based on carbon fabric, vertically aligned graphene nanosheets (VAGN) and Mn3O4 nanoparticles.

Cited by 65 publications

References 26 publications

Ultralight and Binder‐Free All‐Solid‐State Flexible Supercapacitors for Powering Wearable Strain Sensors

Ultralight and Binder‐Free All‐Solid‐State Flexible Supercapacitors for Powering Wearable Strain Sensors

Boosting the cycling stability of transition metal compounds-based supercapacitors

Vertical‐Aligned Li₂S–Graphene Encapsulated within a Carbon Shell as a Free‐Standing Cathode for Lithium–Sulfur Batteries

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Vertically-aligned graphene@Mn3O4 nanosheets for a high-performance flexible all-solid-state symmetric supercapacitor

Abstract: We have made a supercapacitor electrode based on carbon fabric, vertically aligned graphene nanosheets (VAGN) and Mn3O4 nanoparticles.

Cited by 65 publications

References 26 publications

Ultralight and Binder‐Free All‐Solid‐State Flexible Supercapacitors for Powering Wearable Strain Sensors

Ultralight and Binder‐Free All‐Solid‐State Flexible Supercapacitors for Powering Wearable Strain Sensors

Boosting the cycling stability of transition metal compounds-based supercapacitors

Vertical‐Aligned Li2S–Graphene Encapsulated within a Carbon Shell as a Free‐Standing Cathode for Lithium–Sulfur Batteries

Contact Info

Product

Resources

About

Vertically-aligned graphene@Mn₃O₄ nanosheets for a high-performance flexible all-solid-state symmetric supercapacitor

Vertical‐Aligned Li₂S–Graphene Encapsulated within a Carbon Shell as a Free‐Standing Cathode for Lithium–Sulfur Batteries