Asymmetric supercapacitor based on an α-MoO<sub>3</sub> cathode and porous activated carbon anode materials

Barzegar, Farshad; Bello, Abdulhakeem; Momodu, Damilola Y.; Dangbegnon, Julien K.; Taghizadeh, Fatemeh; Madito, M.J.; Masikhwa, T.M.; Manyala, Ncholu I.

doi:10.1039/c5ra03579a

Cited by 59 publications

(36 citation statements)

References 32 publications

(29 reference statements)

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“…The corresponding Ragone plot for the as-fabricatedA SC is shown in Figure6g. The RGO/SnO 2 //RGO/ MoO 3 ASC with an operating voltage of 1.8 Vs howed an energy density of 33 Whkg À1 at ap ower density of 896 Wkg À1 .M ore importantly,w hen the powerd ensity was increasedt o3 7.5 kW kg À1 ,t he energy density of the ASC was still 13.8 Whkg À1 ,s uggesting that it could provideh igh power density and high energy density concurrently.I na ddition, the energy density of our ASC is comparable to those of other SnO 2 -based and MoO 3 -basedA SCs, [48,[52][53][54][55][56] including SnO 2 / MnO 2 //SnO 2 /p olypyrrole( 27.2 Whkg À1 ,8 50 Wkg À1 ), [52] rGO/ CC//SnO 2 /CC (22.8 Whkg À1 ,8 50 Wkg À1 ), [48] AC// polypyrrole@-MoO 3 (12 Whkg À1 ,3kW kg À1 ), [53] and MnO 2 @rGO//MoO 3 @rGO (25.2 Whkg À1 ,72.8 Wkg À1 ). [54] The cycling stability was furthere valuated in the voltage window 0-1.8 Vatah ighc urrent density of 5Ag À1 ,a sd epicted in Figure 6h.T he RGO/SnO 2 //RGO/MoO 3 ASC retained 92.5 %o fi ts initial capacitance after 20 000 cycles,d emonstrating good cycling stability.…”

Section: Asymmetrics Upercapacitorsupporting

confidence: 65%

Asymmetric All‐Metal‐Oxide Supercapacitor with Superb Cycle Performance

Yang

Sun

2018

Chemistry A European J

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Metal oxides have great potential for developing high-performance supercapacitors due to their high specific capacitances. However, achieving high energy densities while maintaining good rate capability and long cycle life has proved to be challenging. We propose herein a strategy for constructing all-metal-oxide asymmetric supercapacitors (ASCs), in which both the cathode and anode are based on metal oxides, and demonstrate their outstanding electrochemical performance. We anchored SnO nanoparticles on the surface of reduced graphene oxide (RGO) through Sn-O-C bonds (as the cathode of ACSs), and employed low-crystalline RGO/MoO nanosheets as the anode, based on the large work function difference between SnO and MoO . The resulting ASC can operate stably at 1.8 V in neutral aqueous electrolyte and deliver an energy density of up to 33 W h kg , which remains at 13.8 W h kg even at 37.5 kW kg . Moreover, the ASC exhibits a good cycling stability of 92.5 % capacitance retention after 20 000 cycles.

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Section: Asymmetrics Upercapacitorsupporting

confidence: 65%

Asymmetric All‐Metal‐Oxide Supercapacitor with Superb Cycle Performance

Yang

Sun

2018

Chemistry A European J

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“…Therefore, extensive research effort has been made on improving the energy density of supercapacitors. 19,20 Currently, most of the ASC devices are fabricated by pseudocapacitive material as positive electrode and carbon materials as negative electrode. [8][9][10][11][12][13] Intensive efforts have been made to exploring various ASC devices, such as Ni(OH) 2 //graphene, 14,15 V 2 O 5 //carbon, 16 MnO 2 //graphene, 17 Co 3 O 4 @C@Ni 3 S 2 //activate carbon 18 and MoO 3 //carbon ASC.…”

Section: Introductionmentioning

confidence: 99%

A high energy density all-solid-state asymmetric supercapacitor based on MoS₂/graphene nanosheets and MnO₂/graphene hybrid electrodes

et al. 2016

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An asymmetric supercapacitor (ASC) with high energy density is designed using flower-like MoS 2 and MnO 2 grown on graphene nanosheets (GNS) as negative and positive electrodes, respectively. In this paper, flowerlike MoS 2 /GNS and MnO 2 /GNS were controllably synthesized through a hydrothermal approach. The prepared MoS 2 /GNS hybrid displays a typical crinkly and rippled structure with ultrathin MoS 2 nanosheets uniformly grown on the surface of graphene. Additionally, the MoS 2 /GNS electrode exhibits superior electrochemical performance, such as high specific capacitance (320 F g -1 at 2 A g -1 ). The MoS 2 /GNS holds great promise as a negative electrode for an ASC due to its high specific capacitance and wide operation window in negative potential. The assembled all-solid-state ASC delivers a remarkable energy density of 78.9 Wh kg -1 at a power density of 284.1 W kg -1 . Thus the MoS 2 /GNS hybrid is a promising electrode material for next-generation storage systems.Subsequently, 5 mL of L-cysteine solution (160 mg mL -1 ) was dropwised into the above solution. Finally, it was transferred into a 50 mL Teflon-lined stainless steel autoclave, which was sealed and heated in an oven at 180 °C for 12 h. During the hydrothermal approach, L-cysteine will decompose and release S 2ions, acting as the sulfur source. Additionally, L-cysteine is the reducing agent for the formation of MoS 2 , because that the Mo (VI) will be reduced to Mo(IV) by L-cysteine. The product were collected by centrifugation, washed with deionized water and ethanol for several times and vacuum dried at 60 °C for 24 h. The final product was loaded into the tube furnace and calcined in N 2 atmosphere at 550 °C for 2 h. For comparison, bare MoS 2 and the samples with various ratio of MoS 2 to GNS were also prepared under the same condition. Preparation of MnO 2 /GNS hybrid170 mL of KMnO 4 aqueous solution (0.34 mg mL -1 ) was added into 32 mL of GNS dispersion (1.6 mg mL -1 ) and the above solution was maintained at 65 °C for 24 h under stirring. After it was cooled to room temperature, the precipitate was collected by centrifuge, washed with ethanol and deionized water and dried in vacuum oven at 100 °C for 12 h. Bare MnO 2 samples were also prepared for comparison. MnO 2 -1 was obtained by thermal treatment of MnO 2 /GNS at 400 °C in air to remove the GNS.Another bare MnO 2 sample (MnO 2 -2) was prepared through the oxidation-reduction reaction between KMnO 4 and ethyl alcohol according to our previously work. 40 Characterization methodsX-ray diffraction (XRD) equipped with Cu Kα radiation (λ = 0.15406 nm) was used to characterize the crystallographic structures of the materials. X-ray photoelectron spectrometer (XPS) analysis was performed using nonmonochromatic,

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“…should benefit from the high energy contribution of the NiCo LDH and the power support of Mn 3 O 4 directly deposited onto the 3D-Ni/Ni wire current collector[48,49]. Also, unlike carbon-based negative electrodes with heavy mass loading to balance, the deposition of Mn 3 O 4 lowered the amount of mass loading needed to achieve mass balance…”

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confidence: 99%

Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries

et al. 2020

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HIGHLIGHTS• The flexible 3D porous structure with a large surface area provides pathways for rapid ion/electron transport and ion diffusion as well as numerous electroactive sites.• The wire-shaped supercapacitor exhibits a high energy density of 153.3 Wh kg −1 and a power density of 8810 W kg −1 .• The hybrid device demonstrates excellent durability under various mechanical deformations. ABSTRACT We report a wire-shaped three-dimensional (3D)hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of electrochemical active sites, easy access of electrolyte ions, and facile charge transport for flexible wearable applications. The interconnected and compact electrode delivers a high volumetric capacitance (gravimetric capacitance) of 73 F cm −3 (2446 F g −1 ), excellent rate capability, and cycle stability. The 3D-nickel cobalt-layered double hydroxide onto 3D-nickel wire (NiCo LDH/3D-Ni)//the 3D-manganese oxide onto 3D-nickel wire (Mn 3 O 4 /3D-Ni) hybrid supercapacitor exhibits energy density of 153.3 Wh kg −1 and power density of 8810 W kg −1 . The red lightemitting diode powered by the as-prepared hybrid supercapacitorcan operate for 80 min after being charged for tens of seconds and exhibit excellent electrochemical stability under various deformation conditions. The results verify that such wire-shaped 3D-hybrid supercapacitors are promising alternatives for batteries with long charge-discharge times, for smart wearable and implantable devices.

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Asymmetric supercapacitor based on an α-MoO₃ cathode and porous activated carbon anode materials

Abstract: Low cost porous carbon materials were produced from cheap polymer materials and graphene foam materials which were tested as a negative electrode material in an asymmetric cell configuration with α-MoO3 as a positive electrode.

Cited by 59 publications

References 32 publications

Asymmetric All‐Metal‐Oxide Supercapacitor with Superb Cycle Performance

Asymmetric All‐Metal‐Oxide Supercapacitor with Superb Cycle Performance

A high energy density all-solid-state asymmetric supercapacitor based on MoS₂/graphene nanosheets and MnO₂/graphene hybrid electrodes

Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries

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Asymmetric supercapacitor based on an α-MoO3 cathode and porous activated carbon anode materials

Abstract: Low cost porous carbon materials were produced from cheap polymer materials and graphene foam materials which were tested as a negative electrode material in an asymmetric cell configuration with α-MoO3 as a positive electrode.

Cited by 59 publications

References 32 publications

Asymmetric All‐Metal‐Oxide Supercapacitor with Superb Cycle Performance

Asymmetric All‐Metal‐Oxide Supercapacitor with Superb Cycle Performance

A high energy density all-solid-state asymmetric supercapacitor based on MoS2/graphene nanosheets and MnO2/graphene hybrid electrodes

Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries

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Product

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Asymmetric supercapacitor based on an α-MoO₃ cathode and porous activated carbon anode materials

A high energy density all-solid-state asymmetric supercapacitor based on MoS₂/graphene nanosheets and MnO₂/graphene hybrid electrodes