High-performance 3 V “water in salt” aqueous asymmetric supercapacitors based on VN nanowire electrodes

Ma, Mingyu; Shi, Zude; Li, Yan; Yang, Yifan; Zhang, Yaxiong; Wu, Yin; Zhao, Hao; Xie, Erqing

doi:10.1039/c9ta12709g

Cited by 59 publications

(26 citation statements)

References 44 publications

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“…[24] With the help of nanoscale design, various VN nanostructures (such as nanosheets, nanorods, nanowires, nanoflowers) have been explored and boosted electrochemical kinetics and utilization are verified in these systems due to larger surface area and increased active sites. [25][26][27] Despite these merits, the pure VN still suffers from fast capacitance fade and inferior cycling life because of adverse phase conversion involving vanadium oxides (VO x ) formed on the VN and accompanied structure collapse. [28] Accordingly, several modification strategies have been adopted on VN to obtain enhanced performance.…”

Section: Introductionmentioning

confidence: 99%

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Chen

Zhang

et al. 2020

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Tailored construction of advanced flexible supercapacitors (SCs) is of great importance to the development of high‐performance wearable modern electronics. Herein, a facile combined wet chemical method to fabricate novel mesoporous vanadium nitride (VN) composite arrays coupled with poly(3,4‐ethylenedioxythiophene) (PEDOT) as flexible electrodes for all‐solid‐state SCs is reported. The mesoporous VN nanosheets arrays prepared by the hydrothermal–nitridation method are composed of cross‐linked nanoparticles of 10–50 nm. To enhance electrochemical stability, the VN is further coupled with electrodeposited PEDOT shell to form high‐quality VN/PEDOT flexible arrays. Benefiting from high intrinsic reactivity and enhanced structural stability, the designed VN/PEDOT flexible arrays exhibit a high specific capacitance of 226.2 F g−1 at 1 A g−1 and an excellent cycle stability with 91.5% capacity retention after 5000 cycles at 10 A g−1. In addition, high energy/power density (48.36 Wh kg−1 at 2 A g−1 and 4 kW kg−1 at 5 A g−1) and notable cycling life (91.6% retention over 10 000 cycles) are also achieved in the assembled asymmetric flexible supercapacitor cell with commercial nickel–cobalt–aluminum ternary oxides cathode and VN/PEDOT anode. This research opens up a way for construction of advanced hybrid organic–inorganic electrodes for flexible energy storage.

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Section: Introductionmentioning

confidence: 99%

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Chen

Zhang

et al. 2020

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“…Since Kumta’s work on vanadium nitride (VN) nanostructure [ 1 , 2 ], VN has extensively been used as anode material for supercapacitors (SCs) [ 3 , 4 , 5 ]. This is due to its large theoretical capacitance [ 6 , 7 ], suitable working negative potential window [ 8 , 9 , 10 ], excellent electrical conductivity [ 10 ] as well as pseudocapacitive properties [ 11 ]. Considering the electrochemical instability of VN in aqueous solution [ 12 , 13 ], the pseudocapacitance charge storage of VN that varies in different aqueous electrolytes (such as KOH and LiCl) also remains a bottleneck [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Pseudocapacitors Based on Interfacial Engineering of Vanadium Nitride Hybrids

Xiong

Tan

et al. 2020

Nanomaterials

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Vanadium nitride (VN) shows promising electrochemical properties as an energy storage devices electrode, specifically in supercapacitors. However, the pseudocapacitive charge storage in aqueous electrolytes shows mediocre performance. Herein, we judiciously demonstrate an impressive pseudocapacitor performance by hybridizing VN nanowires with pseudocapacitive 2D-layered MoS2 nanosheets. Arising from the interfacial engineering and pseudocapacitive synergistic effect between the VN and MoS2, the areal capacitance of VN/MoS2 hybrid reaches 3187.30 mF cm−2, which is sevenfold higher than the pristine VN (447.28 mF cm−2) at a current density of 2.0 mA cm−2. In addition, an asymmetric pseudocapacitor assembled based on VN/MoS2 anode and TiN coated with MnO2 (TiN/MnO2) cathode achieves a remarkable volumetric capacitance of 4.52 F cm−3 and energy density of 2.24 mWh cm−3 at a current density of 6.0 mA cm−2. This work opens a new opportunity for the development of high-performance electrodes in unfavorable electrolytes towards designing high areal-capacitance electrode materials for supercapacitors and beyond.

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“…There have been growing numbers of examples using 3D-NAs in flexible EESDs. [112,[120][121][122][123][124][125][126][127] Various oxide NAs, such as Mn, Ti, Fe, Nb, and V-based oxides, have been utilized as cathodes or anodes in these studies. Yu et al fabricated a Li 4 Ti 5 O 12 -C tubular NA as a binder-free anode for high-rate LIBs.…”

Section: Flexible Devices Facilitated By Individual Nanostructure Surmentioning

confidence: 99%

Surface and Interface Engineering of Nanoarrays toward Advanced Electrodes and Electrochemical Energy Storage Devices

et al. 2021

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Figure 6. a) Schematic illustration of the electron transport pathway in a SEI-wrapped 3D CNT NAs-sulfur cathode. Reproduced with permission. [99] Copyright 2017, Wiley-VCH. b) SEM images of CC@ZnO anode after cycling test without (b 1 ) and with (b 2 ) 3D CF NAs. Reproduced with permission. [103] Copyright 2016, Wiley-VCH. c) The local current density and electric field distribution of Zn anode on a planar current collector (c 1 ) and a 3D current collector (c 2 ). d) Regulated growth of SEI on 3D titanate NAs with ether electrolyte. e) Discharge/charge profiles of the Na 2 Ti 2 O 5 anode with ether electrolyte (inset: HRTEM image of the fully discharged Na 2 Ti 2 O 5 NSs). d,e) Reproduced with permission. [112] Copyright 2019, Wiley-VCH.

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High-performance 3 V “water in salt” aqueous asymmetric supercapacitors based on VN nanowire electrodes

Abstract: In this work, high voltage and high performance 3 V asymmetric supercapacitors were obtained by combining a VN nanowire electrode with an ultra-high concentration “water in salt” electrolyte.

Cited by 59 publications

References 44 publications

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Asymmetric Pseudocapacitors Based on Interfacial Engineering of Vanadium Nitride Hybrids

Surface and Interface Engineering of Nanoarrays toward Advanced Electrodes and Electrochemical Energy Storage Devices

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