Porous MoO<sub>2</sub> nanowires as stable and high-rate negative electrodes for electrochemical capacitors

Zheng, Dezhou; Feng, Huajun; Zhang, Xiyue; He, Xinjun; Yu, Minghao; Lu, Xihong; Tong, Yexiang

doi:10.1039/c7cc01413a

Cited by 50 publications

(34 citation statements)

References 29 publications

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“…[13,[34][35][36][37] In previous studies, MoO 3 has shown its reversible Li-ion insertion/extraction ability. [13,[34][35][36][37] In previous studies, MoO 3 has shown its reversible Li-ion insertion/extraction ability.…”

Section: Introductionmentioning

confidence: 99%

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

et al. 2019

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Exploration of high‐performance cathode materials for rechargeable aqueous Zn ion batteries (ZIBs) is highly desirable. The potential of molybdenum trioxide (MoO 3 ) in other electrochemical energy storage devices has been revealed but held understudied in ZIBs. Herein, a demonstration of orthorhombic MoO 3 as an ultrahigh‐capacity cathode material in ZIBs is presented. The energy storage mechanism of the MoO 3 nanowires based on Zn 2+ intercalation/deintercalation and its electrochemical instability mechanism are particularly investigated and elucidated. The severe capacity decay of the MoO 3 nanowires during charging/discharging cycles arises from the dissolution and the structural collapse of MoO 3 in aqueous electrolyte. To this end, an effective strategy to stabilize MoO 3 nanowires by using a quasi‐solid‐state poly(vinyl alcohol)(PVA)/ZnCl 2 gel electrolyte to replace the aqueous electrolyte is developed. The capacity retention of the assembled ZIBs after 400 charge/discharge cycles at 6.0 A g −1 is significantly boosted, from 27.1% (in aqueous electrolyte) to 70.4% (in gel electrolyte). More remarkably, the stabilized quasi‐solid‐state ZIBs achieve an attracting areal capacity of 2.65 mAh cm −2 and a gravimetric capacity of 241.3 mAh g −1 at 0.4 A g −1 , outperforming most of recently reported ZIBs.

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Section: Introductionmentioning

confidence: 99%

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

et al. 2019

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“…There is no distinct distortion in shape of all the CV curves with the increment of scan rate from 5 to 100 mV s −1 , indicating a good rate capability and reversibility of the supercapacitor . The GCD experiments of the supercapacitor were carried out in the voltage range of 0–1 V for the two‐electrode system (Figure b) . As previously reported, there will be residual amorphous carbon in the system with urea as the reactant, which has an effect on the Coulomb efficiency, and the charge–discharge curves are symmetrical .…”

Section: Resultsmentioning

confidence: 54%

Highly Hydrophilic Carbon Dots' Decoration on NiCo₂O₄ Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Wang

Fang

Tian

et al. 2019

Adv Materials Inter

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The design and exploration of the transition metal oxides (TMOs)–carbon composite are greatly desired for enhanced supercapacitor application due to the low hydrophilicity and electrical conductivity of the prime TMOs. In this work, the highly hydrophilic carbon dots (CDs) with an average size of 2.56 nm are synthesized by a microwave thermolysis method, and then used as a decoration agent on the surface of NiCo2O4 nanowires. The CDs‐decorated NiCo2O4 (CDs/NiCo2O4) with a high surface area of 120.0 m2 g−1 is prepared via a one‐pot hydrothermal method and subsequent annealing. Only a small amount of CDs' decoration not only makes the surface more hydrophilic and easier for aqueous electrolyte infiltration into electrode, but can also promote the electrical conductivity of the as‐synthesized CDs/NiCo2O4 to 30‐fold higher than the prime NiCo2O4, and greatly decrease the internal resistance of the electrode material. Therefore, the CDs/NiCo2O4‐based three‐electrode system shows an extremely high specific capacitance (2202 F g−1) while a symmetrical CDs/NiCo2O4 supercapacitor offers a desirable energy density up to 73.5 Wh kg−1. This work provides a new strategy to improve supercapacitance as well as energy density of TMO‐based electrodes via a convenient surface decoration method by using carbon nanomaterials.

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“…Accordingly, several methods such as wet‐spinning, hydrothermal assembly, film‐to‐fiber conversion, and electrophoretic deposition have been employed for the assembly of graphene‐based fibers. Although graphene‐based fiber electrodes usually deliver high power and long cycle life, their energy storage capacity is limited to about 100–300 F g −1 since electrical double‐layer capacitance serves as their main charge storage mechanism . In comparison, pseudocapacitive materials store energy via reversible redox reactions at electrode–electrolyte interfaces, which may have 10–100 times higher specific capacitance than that of materials based on double‐layer capacitance alone .…”

Section: Introductionmentioning

confidence: 99%

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Zhai

Wang

Karahan

et al. 2018

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Compactness and versatility of fiber-based micro-supercapacitors (FMSCs) make them promising for emerging wearable electronic devices as energy storage solutions. But, increasing the energy storage capacity of microscale fiber electrodes, while retaining their high power density, remains a significant challenge. Here, this issue is addressed by incorporating ultrahigh mass loading of ruthenium oxide (RuO ) nanoparticles (up to 42.5 wt%) uniformly on nanocarbon-based microfibers composed largely of holey reduced graphene oxide (HrGO) with a lower amount of single-walled carbon nanotubes as nanospacers. This facile approach involes (1) space-confined hydrothermal assembly of highly porous but 3D interconnected carbon structure, (2) impregnating wet carbon structures with aqueous Ru ions, and (3) anchoring RuO nanoparticles on HrGO surfaces. Solid-state FMSCs assembled using those fibers demonstrate a specific volumetric capacitance of 199 F cm at 2 mV s . Fabricated FMSCs also deliver an ultrahigh energy density of 27.3 mWh cm , the highest among those reported for FMSCs to date. Furthermore, integrating 20 pieces of FMSCs with two commercial flexible solar cells as a self-powering energy system, a light-emitting diode panel can be lit up stably. The current work highlights the excellent potential of nano-RuO -decorated HrGO composite fibers for constructing micro-supercapacitors with high energy density for wearable electronic devices.

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Porous MoO₂ nanowires as stable and high-rate negative electrodes for electrochemical capacitors

Cited by 50 publications

References 29 publications

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

Highly Hydrophilic Carbon Dots' Decoration on NiCo₂O₄ Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

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Porous MoO2 nanowires as stable and high-rate negative electrodes for electrochemical capacitors

Cited by 50 publications

References 29 publications

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

Highly Hydrophilic Carbon Dots' Decoration on NiCo2O4 Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Nano‐RuO2‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

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Porous MoO₂ nanowires as stable and high-rate negative electrodes for electrochemical capacitors

Highly Hydrophilic Carbon Dots' Decoration on NiCo₂O₄ Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density