Heterostructure arrays of NiMoO4 nanoflakes on N-doping of graphene for high-performance asymmetric supercapacitors

Feng, Xinliang; Ning, Jing; Wang, Dong; Zhang, Jincheng; Xia, Maoyang; Wang, Ying; Hao, Yue

doi:10.1016/j.jallcom.2019.152625

Cited by 49 publications

(26 citation statements)

References 49 publications

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“…bending to retain its performance without substantial degradation [ 3 ]. Ni foam is one material used as the current collector in supercapacitors, although it is inflexible and expensive [ 17 ]. Thus, it should preferably be replaced with a cheaper and more flexible current collector material.…”

Section: Introductionmentioning

confidence: 99%

Treatment of NiMoO4/nanographite nanocomposite electrodes using flexible graphite substrate for aqueous hybrid supercapacitors

et al. 2021

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The cycling performance of supercapacitors sometimes becomes limited when electrode materials slough off during frequent charge–discharge cycles, due to weak bonding between the active material and the current collector. In this work, a flexible graphite foil substrate was successfully used as the current collector for supercapacitor electrodes. Graphite foil substrates were treated in different ways with different acid concentrations and temperatures before being coated with an active material (NiMoO4/nanographite). The electrode treated with HNO3 (65%) and H2SO4 (95%) in a 1:1 ratio at 24°C gave better electrochemical performance than did electrodes treated in other ways. This electrode had capacitances of 441 and 184 Fg–1 at current densities of 0.5 and 10 Ag-1, respectively, with a good rate capability over the current densities of the other treated electrodes. SEM observation of the electrodes revealed that NiMoO4 with a morphology of nanorods 100–120 nm long was properly accommodated on the graphite surface during the charge–discharge process. It also showed that treatment with high-concentration acid created an appropriately porous and rough surface on the graphite, enhancing the adhesion of NiMoO4/nanographite and boosting the electrochemical performance.

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Section: Introductionmentioning

confidence: 99%

Treatment of NiMoO4/nanographite nanocomposite electrodes using flexible graphite substrate for aqueous hybrid supercapacitors

et al. 2021

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“…The yellow and cyan colors denote the electron gain and loss, respectively. The isosurface level is 0.001 e bohr −3 , Table S1: Brief comparison of electrochemical performance of current work with recently relevant literature [ 20 , 22 , 30 , 55 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ].…”

mentioning

confidence: 99%

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

et al. 2022

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Developing high-performance electrode materials is in high demand for the development of supercapacitors. Herein, defect and interface engineering has been simultaneously realized in NiMoO4 nanowire arrays (NWAs) using a simple sucrose coating followed by an annealing process. The resultant hierarchical oxygen-deficient NiMoO4@C NWAs (denoted as “NiMoO4−x@C”) are grown directly on conductive ferronickel foam substrates. This composite affords direct electrical contact with the substrates and directional electron transport, as well as short ionic diffusion pathways. Furthermore, the coating of the amorphous carbon shell and the introduction of oxygen vacancies effectively enhance the electrical conductivity of NiMoO4. In addition, the coated carbon layer improves the structural stability of the NiMoO4 in the whole charging and discharging process, significantly enhancing the cycling stability of the electrode. Consequently, the NiMoO4−x@C electrode delivers a high areal capacitance of 2.24 F cm−2 (1720 F g−1) at a current density of 1 mA cm−2 and superior cycling stability of 84.5% retention after 6000 cycles at 20 mA cm−2. Furthermore, an asymmetric super-capacitor device (ASC) has been constructed with NiMoO4−x@C as the positive electrode and activated carbon (AC) as the negative electrode. The as-assembled ASC device shows excellent electrochemical performance with a high energy density of 51.6 W h kg−1 at a power density of 203.95 W kg−1. Moreover, the NiMoO4//AC ASC device manifests remarkable cyclability with 84.5% of capacitance retention over 6000 cycles. The results demonstrate that the NiMoO4−x@C composite is a promising material for electrochemical energy storage. This work can give new insights on the design and development of novel functional electrode materials via defect and interface engineering through simple yet effective chemical routes.

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“…Therefore, bimetallic oxides have been used for lling the graphene foam. [79][80][81][82][83] Yu et al 79 deposited NiCo 2 O 4 nanoneedles on graphene foam, achieving a specic capacity of 1588 F g À1 at 1 A g À1 . Sun et al 80 used NiCo 2 O 4 nanoparticles as pseudocapacitive materials and achieved a specic capacity of 2300 F g À1 at 1 A g À1 , with a capacitance retention of up to 92% aer 4000 cycles at 10 A g À1 .…”

Section: Electrodes Fabricated With Graphene Foammentioning

confidence: 99%

Recent trends in graphene supercapacitors: from large area to microsupercapacitors

Velasco

Ryu

Boscá

et al. 2021

Sustainable Energy Fuels

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Heterostructure arrays of NiMoO4 nanoflakes on N-doping of graphene for high-performance asymmetric supercapacitors

Cited by 49 publications

References 49 publications

Treatment of NiMoO4/nanographite nanocomposite electrodes using flexible graphite substrate for aqueous hybrid supercapacitors

Treatment of NiMoO4/nanographite nanocomposite electrodes using flexible graphite substrate for aqueous hybrid supercapacitors

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

Recent trends in graphene supercapacitors: from large area to microsupercapacitors

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