Thin‐Sheet Carbon Nanomesh with an Excellent Electrocapacitive Performance

Wang, Huanjing; Zhi, Lei; Liu, Kaiqiang; Dang, Liqin; Liu, Zong–Huai; Lei, Zhibin; Yu, Chang; Qiu, Jieshan

doi:10.1002/adfm.201502025

Cited by 147 publications

(61 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relatively high gravimetric and areal capacitances can be demonstrated simultaneously for NPGMs‐based supercapacitors, manifesting their good compatibility. The total capacitances of the NPGMs‐based supercapacitors are much higher than most previously reported values for high‐performance porous carbon‐based supercapacitors, such as N1‐GDY//N1‐GDY, HGA//HGA, CNM60‐90//CNM60‐90, KPAC‐800//KPAC‐800, porous graphene//porous graphene, CGNS 3‐1073 //CGNS 3‐1073 , NPGCs‐850//NPGCs‐850, and AGMn‐120 min//AGMn‐120 min (Figure e). The power and energy densities of NPGMs‐based supercapacitors are at a medium level in comparison with some reported carbon‐based supercapacitors, such as A‐ p ‐BC‐ N ‐25//A‐ p ‐BC‐ N ‐25, NPGCs‐850//NPGCs‐850, HPCNC‐700‐a//HPCNC‐700‐a, CGNS 3‐1073 //CGNS 3‐1073 , B/N‐CS//B/N‐CS, PGOCN//PGOCN, HPC//HPC, NDPMC//NDPMC, N1‐GDY//N1‐GDY, SSC‐KOH//SSC‐KOH, and KPAC‐800//KPAC‐800 (Figure f).…”

Section: Resultscontrasting

confidence: 57%

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

Wang

Song

et al. 2019

ChemSusChem

View full text Add to dashboard Cite

Nest‐like porous graphene microspheres (NPGMs) are grown by using a chemical vapor deposition (CVD) method in a fluidized bed reactor from methane and basic magnesium carbonate microspheres (synthesized by a stirring‐induced crystallization approach) as carbon source and template, respectively. The CVD‐derived NPGMs have a few‐layer structure and high electrical conductivity, as well as a three‐dimensional individual macroarchitecture accompanied with well‐developed pore channels and great structural integrity. As the electrode for a symmetric supercapacitor, the effect of different mass loadings for NPGMs‐based electrodes on the capacitive energy‐storage performance is investigated. Superior electrochemical properties with respect to gravimetric, areal, and total capacitances, rate capability, and durability are shown by the NPGMs‐based symmetric supercapacitors, even at mass loadings up to 10 mg cm−2. Moreover, the electrochemical behavior of the NPGMs‐based electrode is much superior to those of two‐dimensional lamella‐like graphene and commercial activated carbon.

show abstract

Section: Resultscontrasting

confidence: 57%

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

Wang

Song

et al. 2019

ChemSusChem

View full text Add to dashboard Cite

show abstract

“…[47] Also, the response in lowfrequency range forms into a nearly vertical long line to the Z real axis, indicating the ideal capacitive characteristic of the device and small diffusion impedance. [42,48,49] Figure 2f displays the cycling stability of the SMASC at 1 A g −1 . After 5000 cycles, the specific capacitance still remains 86.1% of initial value and the coulombic efficiency keeps about 100% during the whole cycling, providing an outstanding cycling performance for SMASC.…”

Section: Electrochemical Performancesmentioning

confidence: 98%

Watchband‐Like Supercapacitors with Body Temperature Inducible Shape Memory Ability

Liu

Shen

Jiang

et al. 2016

Advanced Energy Materials

101

View full text Add to dashboard Cite

shopping, detecting body-health, and so on. Nowadays, many major companies are working on exploring more functions on smart watches. In view of diverse functions of smart watches, there are increasing demands on their corresponding energy storage devices with high energy and/or power supply ability. [9][10][11][12][13] However, the energy storage devices are commonly placed in the watches with very small volume, which seriously limit their current energy storage ability and the future boost space. As we know, watchband is an important part of a watch and it plays the fixation function of the watch with a human wrist. Therefore, it can be imagined that, if the watchband had energy storage function, it might meet energy and/or power demands for the smart watches. Taking this into account, such smart watchband should have the right characteristics of flexible energy storage devices, including outstanding electrochemical performance, excellent flexibility, and good performance reliability while bending. In addition, good biocompatibility is a requirement for its practical application because of its direct touch with human skin.Supercapacitors are important energy storage devices, and they have attracted great attention for wearable electronic equipment due to their high power delivery ability, long cycle life, good safety as well as simple manufacturing. [14][15][16][17][18][19][20][21] Here, we demonstrate a new design and fabrication of flexible asymmetric supercapacitors with a smart "watchband-like" function, using reduced graphene oxide (rGO) coated on TiNi alloy (TNA) flake as the negative electrode, MnO 2 deposited on ultrathin Ni foil as the positive electrode, and aqueous or ion liquid-based gel electrolyte as the separator. TNA is a shape memory alloy (SMA) which can "remember" a presupposed shape at high temperature and it is free to bend and can hold the corresponding bending-shape below its phase transition temperature (PTT), and it can restore to the presupposed shape when the temperature is higher than its PTT. [22][23][24][25] In our study, as-made supercapacitors are able to possess excellent electrochemical capacitive properties, maintain the inherent characteristics of SMA (flexibility and shape recovery ability), and have outstanding electrochemical performance reliability while bending. Interestingly, because the PTT of TNA we used is 15 °C, the human skin temperature can directly actuate the shape recovery of the devices. Specifically, we use such a shape Smart watches have gained worldwide popularity because they can integrate diverse functions all in one. However, their energy storage devices currently being used are placed in the watches, and this design seriously limited the energy support ability and the future boost space. Herein, for the first time, a strategy to integrate energy storage device with watchband is put forward, which is realized by the preparation of watchband-like solid-state supercapacitors using graphene coated on TiNi alloy flake as the negative electrode, ultrathin MnO ...

show abstract

“…[6] The N 2 adsorption/desorptioni sotherm of SNMG presentedi nF igure S2 in the Supporting Informatione xhibits at ype IV isotherm with H4-type distinct hysteresis loop.T he PSDs of SNMG andM Ga re similara nd centered at 2-10 nm (Figure 3b and Figure S3 in the Supporting Information). [24] Remarkably,n oc apacitance decay is found for the symmetric supercapacitor after 20 000 cycles at 2Ag À1 ;t his embodies the outstanding long cycle life (Figure 4e). After the introduction of Sa nd Na toms, the intensity ratio of the Da nd Gb ands (I D /I G )f or the graphene increases from 1.35 to 1.49, which indicates that more defects or disorder are introduced by heteroatom doping (Figure 3c).…”

Section: Resultsmentioning

confidence: 79%

High Capacitive Storage Performance of Sulfur and Nitrogen Codoped Mesoporous Graphene

Gao

2018

ChemSusChem

View full text Add to dashboard Cite

Mesoporous graphene is synthesized based on the chemical vapor deposition methodology by using heavy MgO flakes as substrates in a fluidized-bed reactor. Subsequently, sulfur and nitrogen coincorporation into graphene frameworks is realized by the reaction between carbon atoms and thiourea molecules. The as-obtained sulfur and nitrogen codoped mesoporous graphene (SNMG) exhibits remarkable capacitive energy-storage behavior, as a result of well-developed pore channels, in terms of that in a symmetric supercapacitor and lithium-ion hybrid capacitor (LIHC). The ultrahigh durability of the SNMG/SNMG symmetric supercapacitor is demonstrated by long-term cycling, for which no capacitance decay is found after 20 000 cycles. A LIHC constructed from commercial Li Ti O (LTO) as the anode and SNMG as the cathode is capable of delivering much enhanced lithium-storage ability and better rate capability than that of activated carbon (AC)/LTO LIHC. Moreover, SNMG/LTO LIHC exhibits maximum energy and power densities of 86.2 Wh kg and 7443 W kg and maintains 87 % capacitance retention after 2000 cycles.

show abstract

Thin‐Sheet Carbon Nanomesh with an Excellent Electrocapacitive Performance

Cited by 147 publications

References 53 publications

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

Watchband‐Like Supercapacitors with Body Temperature Inducible Shape Memory Ability

High Capacitive Storage Performance of Sulfur and Nitrogen Codoped Mesoporous Graphene

Contact Info

Product

Resources

About