Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

Ye, Lin; Zhao, Lijun; Zhang, Hang; Zan, Ping; Gen, Shuai; Shi, Wenhui; Han, Bing; Sun, Haiming; Yang, Xijia; Xu, Tianhao

doi:10.1039/c6ta09547j

Cited by 91 publications

(26 citation statements)

References 62 publications

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“…At a high current density of 20 mA cm −2 , its energy density still retained 86.6 Wh kg −1 with a power density of 9.138 kW kg −1 . The Ni/Ni 3 S 2 @NiMoO 4 //AC cell can deliver a power density of 18.277 kW kg −1 with a specific energy density of 80.7 Wh kg −1 at the current density of 40 mA cm −2 , The maximum capacitive performance of our hybrid device is substantially higher than that of many previously reported Ni 3 S 2 and NiMoO 4 ‐based electrode materials, such as Ni 3 S 2 @PPy//AC (17.54 Wh kg −1 at the power density of 179.3 W kg −1 ), ZnCo 2 O 4 /NiMoO 4 //AC (40.0 Wh kg −1 at the power density of 1050.2 W kg −1 ), Co‐doped Ni(OH) 2 /Ni 3 S 2 //AC (51.5 Wh kg −1 at the power density of 825 W kg −1 ), Ni 3 S 2 //AC (34.6 Wh kg −1 at the power density of 105.4 W kg −1 ) . More comparison with other works were provided in Tables S1 and S2 (Supporting Information).…”

Section: Resultsmentioning

confidence: 77%

“…The intense Ni 3+ peaks indicate that the majority of Ni element in the final product is Ni 3+ cations. In the S 2p spectra (Figure c), the peaks at ≈162.1 and 163.3 eV and the satellite peak at ≈168.0 eV stem from S in the Ni 3 S 2 phase . For Mo 3d in Figure d, two peaks located at 235.2 and 232.1 eV with a splitting of 3.1 eV demonstrate the presence of Mo 6+ oxidation state.…”

Section: Resultsmentioning

confidence: 88%

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Rational Design of Hierarchically Core–Shell Structured Ni₃S₂@NiMoO₄ Nanowires for Electrochemical Energy Storage

Chen

Liu

et al. 2018

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Rational design and controllable synthesis of nanostructured materials with unique microstructure and excellent electrochemical performance for energy storage are crucially desired. In this paper, a facile method is reported for general synthesis of hierarchically core-shell structured Ni S @NiMoO nanowires (NWs) as a binder-free electrode for asymmetric supercapacitors. Due to the intimate contact between Ni S and NiMoO , the hierarchical structured electrodes provide a promising unique structure for asymmetric supercapacitors. The as-prepared binder-free Ni S @NiMoO electrode can significantly improve the electrical conductivity between Ni S and NiMoO , and effectively avoid the aggregation of NiMoO nanosheets, which provide more active space for storing charge. The Ni S @NiMoO electrode presents a high areal capacity of 1327.3 µAh cm and 67.8% retention of its initial capacity when current density increases from 2 to 40 mA cm . In a two-electrode Ni S @NiMoO //active carbon cell, the active materials deliver a high energy density of 121.5 Wh kg at a power density of 2.285 kW kg with excellent cycling stability.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 88%

Rational Design of Hierarchically Core–Shell Structured Ni₃S₂@NiMoO₄ Nanowires for Electrochemical Energy Storage

Chen

Liu

et al. 2018

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115

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“…[ 140 ] For example, Ye et al designed a binder‐free Co‐doped Ni(OH) 2 /Ni 3 S 2 hybrid cathode which delivered an ultrahigh specific capacitance value of 3023.4 F g −1 at 1 A g −1 and a superb rate performance. [ 141 ] Jampani et al developed Ti‐doped VO 2 via chemical vapor deposition (CVD) technique. [ 67 ] Theoretical studies demonstrated the substantial improvement in the electronic conductivity of the VO 2 was due to Ti doping and oxygen vacancies, which further elevated the capacitance value as high as 310 F g −1 .…”

Section: Heterogeneous Ion Doping Strategymentioning

confidence: 99%

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

et al. 2020

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and considered as indispensable energy storage devices because of their higher power density and greater life expectancy compared with their competitive counterparts such as batteries, fuel cells, and conventional capacitors. Significantly, owing to their distinct advantages including the simple and safe configuration, quick charge/discharge response, large power output, and long operating life (>100 000 cycles), SCs show a promising prospect in next-generation energy technologies, like smart and wearable electronics, quick charging cellphones, regenerative braking electric motors, and instant management of industrial power and energy. [20][21][22][23][24] Currently, there are three main categories of active materials employed to advance the electrochemical performance of SCs: i) carbonaceous matrix, ii) conducting polymers, and iii) metal oxides (MOs). With respect to the former two types, MOs, especially transition MOs, usually delivers a much higher specific capacitance, as their unique crystal structure, combined with the multiple oxidation states of metal ions, are both in favor of excellent charge storage capability. Sometimes, SCs assembled with MOs are also called pseudocapacitors (PCs), because different from carbon-based electrical double layer capacitors (EDLCs), they realize the charge storage via fast Faradaic redox and/or metal ion intercalation reactions. In this way, they could deliver substantially superior specific capacitances as high as 300-1200 F g −1 and offer 10-100 times larger energy density than that of EDLCs. [25][26][27][28][29] In recent years, various MO materials have been proposed as high-performance SCs electrodes, some of which the theoretical capacitances and common operating potential windows are summarized in Figure 1a,b. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Nevertheless, further practical applications of these SCs are severely hindered by the poor electrical conductivity and frustrating structural stability of semiconductive MOs. To address these issues, owing to the rapid advancement of nanotechnology, a series of nano-and meso-scale morphological engineering strategies have been proposed to boost the electrochemical performance of MOs, either by enlarging the electrochemical active surface area or by shortening the diffusion length of electrons/ions. [30][31][32] For instance, combining MOs with some other highly conductive substances such as carbonaceous materials and metals is validated to be a feasible Metal oxides (MOs) with multiple active sites are regarded as one of the most potential active materials for high-performance supercapacitor (SC) constructions. Engineering oxygen vacancies into MOs can effectively modulate their electronic properties, subtly induce impurity states in their bandgaps, and considerably optimize their electrical conductivity. Benefiting from these advantageous properties, the resultant oxygen-defective electrodes generally embed more electrochemical active sites and present better charge storage capability in co...

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Section: Methods To Boost Capacitancementioning

confidence: 99%

“…Except for nonmetallic elements, doping with metal elements can also boost the electrochemical performance of electrode materials . Ye et al designed a Co‐doped Ni(OH) 2 /Ni 3 S 2 hybrid nanomaterial grown on Ni foam . As an electrode, the binder‐free Co‐doped Ni(OH) 2 /Ni 3 S 2 electrode exhibited an ultrahigh specific capacitance value of 3023.4 F g −1 at 1 A g −1 and a superb rate performance.…”

Section: Methods To Boost Capacitancementioning

confidence: 99%

Recent Smart Methods for Achieving High‐Energy Asymmetric Supercapacitors

et al. 2017

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With the development of portable electronic equipment, electric vehicle, space technology, and power‐grid and energy‐storage technology, new efficient energy‐storage devices need to be developed urgently. Recently, asymmetric supercapacitors (ASCs) have attracted ever‐increasing interest as one of the most promising energy‐storage devices given their remarkable advantages of wide operation voltage window, high power density, and moderate energy density. However, to meet the needs of the rapid development of electronic equipment, it is necessary to optimize the electrode materials and device design to further boost the energy density of ASCs. In recent years, numerous attempts have been made to improve the energy density of ASC devices by increasing the capacitance and/or enlarging the voltage window. Here, recent smart strategies are highlighted, including the introduction of intrinsic defects, element doping, and surface functionalization to increase the capacitance of the electrode materials, and optimizing the electrolyte and electrode materials, as well as their surface charge, to broaden the voltage of cells. Moreover, the current challenges and future opportunities for the development of high‐performance ASCs are also discussed.

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Serpent-cactus-like Co-doped Ni(OH)₂/Ni₃S₂ hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

Abstract: A Co-doped Ni(OH)2/Ni3S2 hybrid was grown in situ on Ni foam (NiCo-10) via a one-pot hydrothermal reaction with two-step temperature control.

Cited by 91 publications

References 62 publications

Rational Design of Hierarchically Core–Shell Structured Ni₃S₂@NiMoO₄ Nanowires for Electrochemical Energy Storage

Rational Design of Hierarchically Core–Shell Structured Ni₃S₂@NiMoO₄ Nanowires for Electrochemical Energy Storage

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

Recent Smart Methods for Achieving High‐Energy Asymmetric Supercapacitors

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Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

Abstract: A Co-doped Ni(OH)2/Ni3S2 hybrid was grown in situ on Ni foam (NiCo-10) via a one-pot hydrothermal reaction with two-step temperature control.

Cited by 91 publications

References 62 publications

Rational Design of Hierarchically Core–Shell Structured Ni3S2@NiMoO4 Nanowires for Electrochemical Energy Storage

Rational Design of Hierarchically Core–Shell Structured Ni3S2@NiMoO4 Nanowires for Electrochemical Energy Storage

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

Recent Smart Methods for Achieving High‐Energy Asymmetric Supercapacitors

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Serpent-cactus-like Co-doped Ni(OH)₂/Ni₃S₂ hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

Rational Design of Hierarchically Core–Shell Structured Ni₃S₂@NiMoO₄ Nanowires for Electrochemical Energy Storage

Rational Design of Hierarchically Core–Shell Structured Ni₃S₂@NiMoO₄ Nanowires for Electrochemical Energy Storage