A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life

Wang, Yang; Lai, Wenhui; Wang, Ni; Jiang, Zhi Hong; Wang, Xuanyu; Zou, Peichao; Lin, Ziyin; Fan, Hong Jin; Kang, Feiyu; Wong, Ching‐Ping; Yang, Cheng

doi:10.1039/c6ee03773a

Cited by 262 publications

(98 citation statements)

References 44 publications

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“…MnO, MnO 2 , and Mn 3 O 4 nanoparticle‐based materials have all been reported for supercapacitor electrodes. MnO x nanoparticles of mixed valence have also been studied . These nanoparticles could be as small as 2 nm and be well dispersed within the matrix .…”

Section: Structural Design Of Mnox Materials In Electrodesmentioning

confidence: 99%

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

Wang

2018

Advanced Materials

109

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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: Structural Design Of Mnox Materials In Electrodesmentioning

confidence: 99%

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

Wang

2018

Advanced Materials

109

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“…Though NiO has a high theoretical specific capacitance of 2573 F g −1 within 0.5 V, easy availability and fast faradaic reactions, the real performances of NiO‐based electrodes are far below their theoretical values and their cycle performances are not satisfactory . In addition, manganese oxide (MnO) is one of the most popular pseudocapacitive cathode materials because of its high theoretical capacitance, low cost, natural abundance, and environmental benignity . It has a high theoretical specific capacitance (1350 F g −1 ) due to the redox reaction between Mn II and Mn III , higher than those of other manganese oxides .…”

Section: Introductionmentioning

confidence: 99%

“…[36] In addition, manganese oxide (MnO) is one of the most popular pseudocapacitive cathode materials because of its high theoretical capacitance, low cost, natural abundance,a nd environmental benignity. [37,38] It has ah igh theoretical specific capacitance (1350Fg À1 )d ue to the redox reactionb etween Mn II and Mn III ,h igher than those of other manganese oxides. [39,40] Interestingly,M nO easily forms solid solutionsw ith metal monoxides (e.g.,n ickel oxide)t hat have the same crystal structure and similari onic radius.…”

Section: Introductionmentioning

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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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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“…[6,7] There are several methods to produce graphene/metal composites, classified into ex situ and in situ;t he former includes reactionso fg raphene derivatives with pre-synthesized metal (oxide)n anostructures, whereas the latter consists of crystallization of the metal (oxide) while reducing GO. [8] Numerous studies have been undertaken on in-situ techniques, such as microwave-assisted synthesis, [9] chemicalr eduction, [10][11][12] electrodeposition, [13] hydrothermal deposition, [14,15] electroless deposition, [16] and chemical bath deposition. [17] Although there is a vast number of studies reporting graphene/metal (oxide) composites, [18][19][20] ac omparison of different metals regarding the electrochemical performance of GO and rGO electrodes needs furtheri nvestigation for designingn ew composites.…”

Section: Introductionmentioning

confidence: 99%

First‐Row Transition‐Metal Cations (Co²⁺, Ni²⁺, Mn²⁺, Fe²⁺) and Graphene (Oxide) Composites: From Structural Properties to Electrochemical Applications

Oztuna

Yağcı

Ünal

2019

Chemistry A European J

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Composites of graphene (oxide) (GO) and first-row transition-metal cations( Co 2 + ,N i 2 + ,M n 2 + ,F e 2 + )a re prepared by mixingG Oa nd aqueous metal salt solutions. The amount of metal cation bound to GO nanosheets is calculated by using inductively coupled plasma mass spectrometry (ICP-MS) andt he possible binding sites of the metalsa re investigated by meanso fa ttenuated total reflectance infrared (ATR-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements. Electrodes loaded with the metal/GO composites are prepared by as imple drop-casting technique without any binderso rc onductive additives.T he effect of electrochemical reduction on the structure of the composite electrodes is investigated by Raman spectroscopy, XPS, X-ray diffraction (XRD) analysis, and field emission scanninge lectron microscopy (FESEM). Ad etailed electrochemical characterization is performed for the utilization of the composite electrodes for electrochemical capacitors and possible oxygen reduction reactione lectrocatalysts by cyclic voltammetry (CV) and rotatingd isk electrode measurements. The highest areal capacitance is achieved with the as-deposited Fe/GO composite (38.7 mF cm À2 at 20 mV s À1 ). In the cyclic stabilitym easurements, rCo/GO, rNi/GO, rMn/GO, and rFe/ GO exhibit ac apacitance retention of 44, 1.1, 73, and 87 % after 3000cycles of CV at 100 mV s À1 ,r espectively.[a] Dr.

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A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life

Abstract: The rGO/MnOx composite is compatible with the slurry dispensing process for electrode fabrication, and can exhibit super-long life property.

Cited by 262 publications

References 44 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?

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

First‐Row Transition‐Metal Cations (Co²⁺, Ni²⁺, Mn²⁺, Fe²⁺) and Graphene (Oxide) Composites: From Structural Properties to Electrochemical Applications

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A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life

Abstract: The rGO/MnOx composite is compatible with the slurry dispensing process for electrode fabrication, and can exhibit super-long life property.

Cited by 262 publications

References 44 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?

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

First‐Row Transition‐Metal Cations (Co2+, Ni2+, Mn2+, Fe2+) and Graphene (Oxide) Composites: From Structural Properties to Electrochemical Applications

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First‐Row Transition‐Metal Cations (Co²⁺, Ni²⁺, Mn²⁺, Fe²⁺) and Graphene (Oxide) Composites: From Structural Properties to Electrochemical Applications