Nanostructured manganese dioxide with adjustable Mn3+/Mn4+ ratio for flexible high-energy quasi-solid supercapacitors

Dang, Shan; Wen, Yuxiang; Qin, Tianfeng; Hao, Jiaxin; Li, Haoqian; Huang, Juanjuan; Yan, Dingshun; Cao, Guozhong; Peng, Shanglong

doi:10.1016/j.cej.2020.125342

Cited by 66 publications

(22 citation statements)

References 55 publications

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“…With the emerging energy shortage and environmental pollution triggered by the overexploitation of conventional fossil fuels, sustainable energy storage has attracted increasing attention in the industrial field. Many alternative energy technologies, in particular, water splitting, various batteries, and supercapacitors, have been extensively studied due to their huge potential and merits of high efficiency, renewability, low cost, environmental friendliness, and so on. − Among them, supercapacitors, one of the most promising electrical energy storage devices, are receving increasing interest owing to their desirable properties, such as high-power density, fast charge/discharge, and reliable life. − Moreover, electrochemical water splitting from the hydrogen evolution reaction (HER) is regarded as the process that has the most potential toward scalable hydrogen production. − Currently, both the supercapacitor and the electrocatalyst for the HER are needed to make technological breakthroughs in terms of active electrode materials with high performance. For instance, the low energy density inhibits the large-scale utilization of the supercapacitor.…”

Section: Introductionmentioning

confidence: 99%

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Zhang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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Molybdenum disulfide (MoS 2 ) is a promising candidate for use as a supercapacitor electrode material and non-noble-metal electrocatalyst owing to its relatively high theoretical specific capacitance, Pt-like electronic feature, and graphene-like structure. However, insufficient electrochemically active sites along with poor conductivity significantly hinder its practical application. Heteroatom doping and phase engineering have been regarded as effective ways to overcome the inherent limitations of MoS 2 and enhance its ion storage and electrocatalytic performance. In this study, a plasma-assisted nitrogen-doped 1T/2H MoS 2 heterostructure has been proposed for the first time, resulting in excellent supercapacitor performance and hydrogen evolution reaction activity. XPS, Raman, and TEM analysis results indicate that N atoms have been successfully doped into MoS 2 nanosheets via roomtemperature low-power N 2 plasma, and the 1T/2H hybrid phase is maintained. As expected, the 1T/2H MoS 2 heterostructure after a 10 min plasma treatment displayed a much boosted supercapacitive performance with a high specific capacitance of 410 F g −1 at 1 A g −1 and an excellent hydrogen evolution property with a low overpotential of 131 mV vs RHE at 10 mA cm −2 for hydrogen evolution reaction. The excellent performance is superior to most of the recently reported outstanding MoS 2 -based electrode and electrocatalytic materials. Moreover, the as-assembled flexible symmetric supercapacitor shows a high specific capacitance of 84.8 F g −1 and superior mechanical robustness with 84.5% capacity retention after 2000 bending cycles.

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Section: Introductionmentioning

confidence: 99%

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Zhang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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“…Even at the maximum power density of 18 × 10 3 W kg −1 , it still retains an energy density of 26.7 Wh kg −1 , which is far higher than the maximum energy density shown in other supercapacitor systems reported previously in Figure 10, such as 3DG//OV−MnO 2 (56.04 Wh kg −1 ), 60 MoO 3−x // MnO 2 −C (54.2 Wh kg −1 ), 61 MoO x N y /RGO/CNF// MnO x N y /RGO/CNF (49 Wh kg −1 ), 24 AC//N+MnO 2 @ TiC/C (23.9 Wh kg −1 ), 62 Bi 2 Se 3 −MnO 2 //Bi 2 Se 3 −MnO 2 (62 Wh kg −1 ), 63 and FeOOH/C//MnO 2 −70 (55.9 Wh kg −1 ). 64 Furthermore, to demonstrate the practical application of ASC, that can be used to drive an electric fan running as the power source, as shown in Figure 11(b,c). In addition, more detailed results of electrochemical performance comparison for MnO 2based supercapacitors have been provided in Table S1 in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Gong

Tong

Xiao

et al. 2022

ACS Appl. Energy Mater.

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Suffering from the sluggish kinetics resulting from the inferior conductivity of manganese dioxide (MnO 2 ), many endeavors have been devoted to promoting the electrochemical performance of MnO 2 . Doping heteroatoms into host materials has emerged as an effective strategy to generate lattice vacancies for fast diffusion of ions/electrons in MnO 2 -based materials for supercapacitors (SCs). To eliminate the use of dangerous solvents and the severe reaction conditions used in previous reports, in this work, we first obtain N-doped MnO 2 (N−MnO 2 ) nanosheets with abundant oxygen vacancies simultaneously by a mild hydrothermal reaction. Thus, thanks to the mutual effect of N doping and oxygen vacancies, the capability of ion diffusion for N−MnO 2 /NGCF (NGCF represents N-doped single-wall carbon nanotube cross-linked graphene composite film) has increased an order of magnitude (1.68 × 10 −11 cm 2 s −1 compared with 8.42 × 10 −13 cm 2 s −1 for MnO 2 /NGCF) and shows superior rate capability, where at 30 A g −1 a capacitance retention of 51.7% remains, i.e., 185.1 F g −1 , compared with 44% at 15 A g −1 for MnO 2 /NGCF. In addition, we apply ex situ X-ray diffraction (XRD) and scanning electron microscopy (SEM) to verify the fact that nitrogen doping with abundant vacancies will benefit reversible intercalation/stripping of Na + by triggering the phase change from MnO 2 to MnOOH for N−MnO 2 compared with MnO 2 with adsorption/desorption during the charge−discharge process, which has never been discussed before. Excitingly, an asymmetric supercapacitor (ASC), fabricated by N−MnO 2 /NGCF as a cathode and MnO 2 /NGCF as an anode, delivers a maximum energy and power density of 75.3 Wh kg −1 and 18.1 × 10 3 W kg −1 , respectively. This work provides an approach to design self-standing advanced N-doped MnO 2 and a deeper insight into the mode of reaction of MnO 2 in neutral electrolyte for aqueous SCs.

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“…More interestingly, Dang et al. [ 312 ] revealed that transition metal‐based materials with different valence states possess improved electrical conductivity. The ratio of Mn 3+ /Mn 4+ in the MnO 2 material can be controlled by the electrodeposition temperature.…”

Section: Strategies For Improving Electrochemical Activity Of Tmcsmentioning

confidence: 99%

Recent Development of Flexible and Stretchable Supercapacitors Using Transition Metal Compounds as Electrode Materials

Lyu

Antink

Kim

et al. 2021

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Flexible and stretchable supercapacitors (FS‐SCs) are promising energy storage devices for wearable electronics due to their versatile flexibility/stretchability, long cycle life, high power density, and safety. Transition metal compounds (TMCs) can deliver a high capacitance and energy density when applied as pseudocapacitive or battery‐like electrode materials owing to their large theoretical capacitance and faradaic charge‐storage mechanism. The recent development of TMCs (metal oxides/hydroxides, phosphides, sulfides, nitrides, and selenides) as electrode materials for FS‐SCs are discussed here. First, fundamental energy‐storage mechanisms of distinct TMCs, various flexible and stretchable substrates, and electrolytes for FS‐SCs are presented. Then, the electrochemical performance and features of TMC‐based electrodes for FS‐SCs are categorically analyzed. The gravimetric, areal, and volumetric energy density of SC using TMC electrodes are summarized in Ragone plots. More importantly, several recent design strategies for achieving high‐performance TMC‐based electrodes are highlighted, including material composition, current collector design, nanostructure design, doping/intercalation, defect engineering, phase control, valence tuning, and surface coating. Integrated systems that combine wearable electronics with FS‐SCs are introduced. Finally, a summary and outlook on TMCs as electrodes for FS‐SCs are provided.

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Nanostructured manganese dioxide with adjustable Mn3+/Mn4+ ratio for flexible high-energy quasi-solid supercapacitors

Cited by 66 publications

References 55 publications

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Recent Development of Flexible and Stretchable Supercapacitors Using Transition Metal Compounds as Electrode Materials

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Nanostructured manganese dioxide with adjustable Mn3+/Mn4+ ratio for flexible high-energy quasi-solid supercapacitors

Cited by 66 publications

References 55 publications

Controllably Doping Nitrogen into 1T/2H MoS2 Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N2 Plasma

Controllably Doping Nitrogen into 1T/2H MoS2 Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N2 Plasma

Enhanced Reaction Kinetics of N–MnO2 Nanosheets with Oxygen Vacancies via Mild NH3·H2O Bath Treatment for Advanced Aqueous Supercapacitors

Recent Development of Flexible and Stretchable Supercapacitors Using Transition Metal Compounds as Electrode Materials

Contact Info

Product

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Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors