Nickel–cobalt hydroxide nanoflakes conformal coating on carbon nanotubes as a supercapacitive material with high-rate capability

Li, Min; Ma, KeYuan; Cheng, J.P.; Lv, Danhui; Zhang, X.B.

doi:10.1016/j.jpowsour.2015.04.013

Cited by 135 publications

(55 citation statements)

References 41 publications

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“…Moreover, we found that, for TMPs, the Co-P/NF has shown the best rate performance and Ni-P/NF is the worst one. The capacitance of NiCo-P-6/NF is significantly superior to the reported hydroxides, sulfides and oxides, such as nickel-cobalt hydroxide nanoflakes CNTs (1,151 F g −1 at 1 A g −1 ) [56], CNT@Ni(OH) 2 composites (1,136 F g −1 at 2 A g −1 ) [57], 2D MoSe 2 -Ni(OH) 2 nanohybrid (1,175 F g −1 at 1 A g −1 ) [58], hierarchical mesoporous Co 3 O 4 @ZnCo 2 O 4 nanowire arrays supported on NF (1,240.5 C g −1 at 2 mA cm −2 ) [59], NiCo 2 S 4 -reduced graphene oxide aerogel (1,268 F g −1 at 1 A g −1 ) [60], and other TMPs (Table S4) and some freestanding metal-based electrodes (Table S2). We can conclude that NiCo-P-6/NF inherits the advantages of nanowalls and TMPs (the metalloid characteristics, good conductivity), making it promising for the application in supercapacitors.…”

Section: Resultsmentioning

confidence: 89%

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Zhang

et al. 2019

Sci. China Mater.

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The design of the electrode with high-area and mass capacitance is important for the practical application of supercapacitors. Here, we fabricated the porous NiCoP nanowalls supported by Ni foam (NiCo-P/NF) for supercapacitors with win-win high-area and mass capacitance. The NiCoOH nanowall precursor was prepared by controlling the deposition rate of Ni 2+ and Co 2+ on NF through a sodium acetate-assisted (floride-free) process. After the phosphorization, the NiCo-P nanowalls formed with high loading about 8.6 mg cm −2 on NF. The electrode combined several advantages favorable for energy storage: the plentiful pores beneficial for ion transport, the nanowalls for easy accommodation of electrolyte, good conductivity of NiCo-P for easy transport of electrons. As expected, the NiCo-P/NF exhibited a high specific mass capacitance (1,861 F g −1 at 1 A g −1 , 1,070 F g −1 at 10 A g −1 ), and high area capacitance (17.31 F cm −2 at 5 mA cm −2 and 10 F cm −2 at 100 mA cm −2 ). The asymmetric supercapacitor (ASC) composed of NiCo-P/ NF positive electrode coupled with commercial active carbon negative electrode exhibited a high energy density of 44.9 W h kg −1 at a power density of 750 W kg −1 . The ASC can easily drive fans, electronic watch and LED lamps, implying their potential for the practical application.

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Section: Resultsmentioning

confidence: 89%

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Zhang

et al. 2019

Sci. China Mater.

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“…The low frequency peak at 583 cm À1 was attributed to the M-OH bending mode of Co and Al, and 445 cm À1 could be assigned to M-O stretching vibration. 46 Furthermore, the narrow peak appeared at 2189 cm À1 was the typical stretching vibration of C^N bonds in CNO anions indicating the incomplete decomposition of urea. 47 The specic surface area and pore size distributions of the as-synthesized composites CA-1, CA-2 and CA-3 were investigated by using BET technique.…”

Section: Resultsmentioning

confidence: 99%

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature

Teng

et al. 2019

RSC Adv.

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The 3D flower-like CoAl-layered double hydroxide (CoAl-LDH) was successfully prepared using the functional template agent of fluoride ions via a facile one-step hydrothermal route. Various techniques proved that all the samples presented 3D flower-like microstructural morphology. Representatively, the CA-2 sample, which was synthesized with the molar ratio of Co : Al of 3.65 : 1, had considerably abundant pores in its thin nanosheets. The average pore size was 2-4 nm, the specific surface area was equal to 49.45 m 2 g À1 , and the thickness of nanosheets was approximately 3.068 nm. The CA-2 sample showed an excellent response to 0.01-100 ppm NO 2 with ultrafast response/recovery time at room temperature (RT). The detection limit of the sensor even reached 10 ppb. The superior gas sensing performance could be attributed to the synergistic effects of the functional template agent of fluoride ions and specific porous 3D flower-like nanostructure. The current study showed that the 3D flower-like CoAl-LDHs might a promising material in practical detection of NO 2 at RT. Scheme 2 Schematic for the mechanism of NO 2 sensing for CoAl-LDHs. (a) SEM image of 3D flower-like CA-2 on Au electrode; (b and c) the model with response procedure of gas sensing; (d) I-V curve measured for CA-2 sensor in air and 50 ppm NO 2 exposure at RT; (e) IR spectra of CA-2 before and after NO 2 gas detection (CA-2 test NO 2 gas sensing for 2 h).21918 | RSC Adv., 2019,9,[21911][21912][21913][21914][21915][21916][21917][21918][21919][21920][21921] This journal is

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“…74-1057) [31] can be seen along with weak peaks due to the α-phase (JCPDS no. 38-0715) [32] . Then, the Fig.…”

Section: Resultsmentioning

confidence: 99%

“…For both NCNS-0 and NCNS-5.2, the broad bands at 3441 cm −1 and 1631 cm −1 arise from the O -H stretching vibration of the hydrogen-bonded water molecules and the bending mode of the water molecules, respectively [33] . Peaks near 640 cm −1 are due to the M -OH bending mode of Ni and Co, and the bands below 500 cm −1 are attributed to the M -O stretching vibration [32] . Notably, the sharp O -H stretching vibration of non-hydrogenbonded free hydroxyl groups at 3650 cm −1 appeared in NCNS-0.…”

Section: Resultsmentioning

confidence: 99%

Phase control of 2D binary hydroxides nanosheets via controlling-release strategy for enhanced oxygen evolution reaction and supercapacitor performances

Wei

Chu

et al. 2019

Journal of Energy Chemistry

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Nickel–cobalt hydroxide nanoflakes conformal coating on carbon nanotubes as a supercapacitive material with high-rate capability

Cited by 135 publications

References 41 publications

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature

Phase control of 2D binary hydroxides nanosheets via controlling-release strategy for enhanced oxygen evolution reaction and supercapacitor performances

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Nickel–cobalt hydroxide nanoflakes conformal coating on carbon nanotubes as a supercapacitive material with high-rate capability

Cited by 135 publications

References 41 publications

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO2 detection at room temperature

Phase control of 2D binary hydroxides nanosheets via controlling-release strategy for enhanced oxygen evolution reaction and supercapacitor performances

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Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature