Multifunctional Supercapacitors: Rational Design of Nanostructured Electrode Materials toward Multifunctional Supercapacitors (Adv. Funct. Mater. 2/2020)

Yan, Jian; Li, Shaohui; Lan, Binbin; Wu, Yucheng; Lee, Pooi See

doi:10.1002/adfm.202070008

Cited by 37 publications

(47 citation statements)

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“…However, differently from the capacitance retention down to 37.3 % for the SH0 at 3 A/g, there has no significant degradation observed for the two axial‐substituted compounds, whose 83.6 % and 82.1 % capacitance retentions can keep the pseudo‐capacitive characteristic. Due to the highest specific capacity inversely proportional to the equivalent serial resistance (ESR) including the transport resistances of electrons and ions, the faradaic reaction happens rapidly, and thus the rate capability of the electrode is mainly determined by the transports of electrons and ions. Compared to the SH0, the two axial‐substituted SubPc compounds SH1 and SH2 can prevent the blocking of ion channels during the stacking process and facilitate the transport of ions.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Optoelectronic Property of Axial‐Substituted Subphthalocyanines

Wang

Zhang

et al. 2020

ChemistryOpen

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Two novel substituted subphthalocyanines have been prepared introducing m‐hydroxybenzoic acid and m‐hydroxyphenylacetic acid into the axial position of bromo‐subphthalocyanine. The compounds have been characterized by Fourier transform infrared (FT‐IR), Nuclear Magnetic Resonance (NMR) and single‐crystal X‐rays diffraction (XRD) methods. Their photophysical properties show that the axial substitution results into a relatively higher fluorescence quantum efficiency (ΦF=5.74 for m‐hydroxybenzoic acid and 9.09 % for m‐hydroxyphenylacetic acid) in comparison with that of the prototype compound, despite the almost negligible influence on the maximum absorption or the emission position. Moreover, the electrochemical behaviors show that the axial‐substituted subphthalocyanines also exhibit enhanced specific capacitances of 395 F/g (m‐hydroxybenzoic acid) and 362 F/g (m‐hydroxyphenylacetic acid) compared with 342 F/g (the prototype) to the largest capacitance at the scan rate of 5 mV/s, and the significantly larger capacitance retentions of 83.6 % and 82.1 % versus 37.3 % upon density up to 3 A/g. These results show the potential of these axial‐substituted subphthalocyanines in the use as organic photovoltaics and supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Optoelectronic Property of Axial‐Substituted Subphthalocyanines

Wang

Zhang

et al. 2020

ChemistryOpen

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“…Compared to conventional energy storage devices, SCs have higher specific capacity, faster charging and discharging time, longer cycle life, and excellent thermal stability. Such properties further underlined SCs great potential as an emerging type of electrochemical energy storage (EES) system for world's most advanced adjustable EES device, nanostructured electrode, self‐charging power textiles, flexible printed circuits, etc. As to the electrode material, a high‐performance SC electrode generally requires high electrical conductivity, large ion‐accessible surface area, fast ionic transport rate, and good electrochemical stability .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Oxygen‐Vacancy Abundant NiMn‐Layered Double Hydroxides for Ultrahigh Capacity Supercapacitors

Tang

Shen

Cheng

et al. 2020

Adv Funct Materials

241

101

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The rational design of advanced structures consisting of multiple components with excellent electrochemical capacitive properties is one of the crucial hindrances to be overcome for high‐performance supercapacitors (SCs). Herein, a superfast and facile synthesis of flower‐like NiMn‐layered double hydroxides (NiMn‐LDH) with high SC performance using an electrodeposition process on nickel foam is proposed. Oxygen vacancies are then modulated via mild H2O2 treatment for the first time, significantly promoting the electrochemical energy storage performance. The oxygen‐vacancy abundant NiMn‐LDH (Ov‐LDH) reaches a maximum specific capacity of 1183 C g−1 at the current density of 1 A g−1 and retains a high capacity retention of 835 C g−1 even at a current density of up to 10 A g−1. Furthermore, the assembled asymmetric SC device achieves a high specific energy density of 46.7 Wh kg−1 at a power density of 1.7 kW kg−1. Oxygen vacancies are proven to play a vital role in the improvement of electrochemistry performance of LDH based on experimental and theoretical studies. This vacancy engineering strategy provides a new insight into SC active materials and should be beneficial for the design of the next generation of energy storage devices.

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“…Supercapacitors (SCs), as one kind of efficient storage systems, have received wide attention due to their advantages of superior power density, safe operation, long life, and low maintenance cost . However, most commercialized SCs are symmetrical electrical double layer capacitors (EDLCs) of activated carbon (AC) as active materials, and their low energy density limits further applications .…”

Section: Introductionmentioning

confidence: 99%

2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

Zhai

et al. 2020

Batteries & Supercaps

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It remains a great challenge to simultaneously guarantee the conductivity and high areal loading of active materials for integrated electrode of supercapacitors. Herein, we designed a hierarchical structure with cores of NiSe single‐crystal nanorods and sheaths of 2‐nm‐thick NiCo thin sheets grown on nickel foam (NiCo LDH@NiSe/NF) as integrated electrode. It reaches a high areal capacity of 1131 μAh cm−2 at a current density of 5 mA cm−2, which is 2.2 times of NiSe/NF (522 μAh cm−2) and 6.0 times of NiCo LDH/NF (189 μAh cm−2), superior to most reported integrated electrodes. The enhanced areal capacity can be ascribed to the high active material loading of 6.5 mg cm−2 (twice more than other reported values) and considerable conductivity of single‐crystal NiSe nanorods of 2630 S cm−1. The fabricated hierarchical integrated electrode of NiCo LDH@NiSe/NF assembled with activated carbon shows a maximum energy density of 0.454 mWh cm−2 and a maximum power density of 80 mW cm−2. This work presents supports of single‐crystal nanorods for thin LDH sheets to fabricate high‐density hierarchical structure for integrated electrode, which improves the conductivity and structural stability of active materials especially the LDHs, resulting in excellent electrochemical performance. It offers a promising approach to engineer and fabricate advanced supercapacitors with enhanced areal capacity.

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Multifunctional Supercapacitors: Rational Design of Nanostructured Electrode Materials toward Multifunctional Supercapacitors (Adv. Funct. Mater. 2/2020)

Cited by 37 publications

References 0 publications

Synthesis, Characterization and Optoelectronic Property of Axial‐Substituted Subphthalocyanines

Synthesis, Characterization and Optoelectronic Property of Axial‐Substituted Subphthalocyanines

Fabrication of Oxygen‐Vacancy Abundant NiMn‐Layered Double Hydroxides for Ultrahigh Capacity Supercapacitors

2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

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