Hierarchical porous Co(OH)F/Ni(OH)2: A new hybrid for supercapacitors

Li, Xudong; Ding, Rui; Shi, Wei; Xu, Qi; Ying, Danfeng; Huang, Yongfa; Liu, Enhui

doi:10.1016/j.electacta.2018.01.194

Cited by 92 publications

(35 citation statements)

References 48 publications

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“…The Nyquist plots are fitted to their specific electronic circuit model as shown in the figure; where R s stands for the equivalent series resistance related to the ionic resistance of the electrolyte: the intrinsic resistance of the substrate and the contact resistance at the active material/current collector interface (equivalent to high frequency intercept on the real Z or x axis); L is the selfinductance related to electrical connections [42]; W is a Warburg impedance arising from a diffusion-controlled process at low frequency; R ct is the charge transfer resistance of the double-layer capacitance [43] and the constant phase element (CPE, Q) was used to replace the double-layer capacitance (Cdl) because of the deviation from an ideal capacitor [44]. Moreover, the straight line found with angle lower than 45° for all samples is the capacitative behavior characteristic under diffusion control.…”

Section: Electrochemical Impedance Spectroscopy Resultsmentioning

confidence: 99%

Electrochemical measurements of synthesized nanostructured β-Ni(OH)2 using hydrothermal process and activated carbon based nanoelectroactive materials

et al. 2018

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In this investigation, nickel hydroxide Ni(OH) 2 based nanostructured materials were synthesized by simple and low cost free template hydrothermal method at two different growth temperatures with and without SDS surfactant. The X-ray diffraction, Raman spectroscopy and field emission scanning electron microscopy analysis confirmed the formation of β-Ni(OH) 2 pure brucite crystalline phase in spherical nanoparticle morphology with an average diameter ranging from 8 to 27 nm. In the second step, these nanospherical agglomerated hydroxide particles with activated carbon addition were performed as electroactive materials deposited on nickel foam current collector as working electrodes. The electrochemical tests in a three-electrode configuration using 6 MKOH electrolyte show that the best electroactive NPs (β bc-Ni(OH) 2 and β-Ni(OH) 2 obtained at optimized conditions, have a maximum specific capacitance (C s) of 4697 F g −1 and 3431 F g −1 at 5 mV s −1 scan rate with a specific capacity (Q s) of 744 mAh g −1 and 618 mAh g −1 at 1 A g −1 current density with an R s of about 0.24 and 0.28 Ω, respectively. At 30 A g −1 after 1700 cycles, the coulombic retention is around 99.06% (or capacity retention 109 mAh g −1), demonstrating remarkable cycling stability for Ni based hydroxide.

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Section: Electrochemical Impedance Spectroscopy Resultsmentioning

confidence: 99%

Electrochemical measurements of synthesized nanostructured β-Ni(OH)2 using hydrothermal process and activated carbon based nanoelectroactive materials

et al. 2018

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“…NCP@NCH / CC has the lowest overpotential in both alkaline and acidic media. Figure 6b and 6e reveals the Tafel slope of different carbon electrodes under acidic and alkaline conditions [46,47] . It can be seen that the Tafel slope of NCP@NCH / CC is 82 mV / dec in 0.5 M H 2 SO 4 electrolyte, much lower than the NCH@NCH / CC (142 mV / dec) and NCP / CC (178 mV / dec).…”

Section: Resultsmentioning

confidence: 95%

“…Figure 6b and 6e reveals the Tafel slope of different carbon electrodes under acidic and alkaline conditions. [46,47] It can be seen that the Tafel slope of NCP@NCH/CC is 82 mV/dec in 0.5 M H 2 SO 4 electrolyte, much lower than the NCH@NCH/CC (142 mV/dec) and NCP /CC (178 mV/dec). The Tafel slope of NCP@NCH/CC is 82 mV/dec in 1 M KOH electrolyte, which is less than NCH@NCH/CC and NCP/ CC (101, 125 mV/dec).…”

Section: Electrochemical Properties Of Ncp@nch/cc and Nch@nch/cc Ncp/ccmentioning

confidence: 94%

3D Carbon Electrode with Hierarchical Nanostructure Based on NiCoP Core‐Layered Double Hydroxide Shell for Supercapacitors and Hydrogen Evolution

et al. 2021

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Currently, the development of self-supported and low-cost earth-abundant electrocatalysts with well-defined nanostructure has shown significant potential in energy-related storage and electrocatalytic reactions. Herein, a three-dimensional (3D) selfsupporting electrode NiCoP@NiCo LDH/CC (NCP@NCH/CC) constructed with NCP@NCH core-shell nanostructures and carbon cloth as substrate has been developed via the hydrothermal and subsequent electrodeposition process. The obtained 3D electrode with 1D NiCoP nanowires (NWs) core and 2D NiCo LDH nanosheets shell can exhibit superior electrochemical performance and remarkable stability for the pseudocapacitive reaction and hydrogen evolution reaction (HER), even comparable to the best reported transition metal phosphides (TMP) electrodes. It reveals an ultra-high area specific capacitance (9.4 F/cm 2 at 10 mA/cm 2 in 3 M KOH electrolyte), outstanding capacitance retention (74.12 % from 10 to 60 mA/cm 2 ) and excellent cycling stability (93.51 % of original capacitance was retained after 5000 cycles at 50 mA/cm 2 ) as supercapacitor electrode material. For HER in alkaline media, it can demonstrate an overpotential of 182 mV at 10 mA/cm 2 and Tafel slope of 82 mV/dec in 1 M KOH. For HER in acidic electrolyte, it can exhibit an overpotential of 141 mV at 10 mA/ cm 2 and Tafel slope of 82 mV/dec in 0.5 M H 2 SO 4 . The electrochemical performance enhancement can be ascribed to the core-shell NiCoP@NiCo LDH nanostructure anchored on the carbon and synergistic effect with the carbon cloth in 3D electrode. Our present work provides a facile strategy to construct 3D TMP-based carbon electrode with core-shell nanostructures, demonstrating a great promise for storage processes and energy conversion.

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“…Fig. 10a-iii and b-iii show, respectively, the peak components of the O 1s peak occurring at 532.5 eV (O–Si) and at 531.3 eV (O–H) for the MILP silicone gel; 35,36 for the conventional silicone gel the corresponding peaks occurred at 533 eV and 530.5 eV. 34,35,37 …”

Section: Resultsmentioning

confidence: 97%

“…10a-iii and b-iii show, respectively, the peak components of the O 1s peak occurring at 532.5 eV (O-Si) and at 531.3 eV (O-H) for the MILP silicone gel; 35,36 for the conventional silicone gel the corresponding peaks occurred at 533 eV and 530.5 eV. 34,35,37 All available data reported herein allow us to infer a reaction scheme (Fig. 11) for the synthesis of the MILP silicone gel.…”

Section: Gelation Of Dimethylpolysiloxane (Silicone)mentioning

confidence: 99%

A novel green chemistry gelation method for polyvinyl pyrrolidone (PVP) and dimethylpolysiloxane (silicone): microwave-induced in-liquid-plasma

2021

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Hierarchical porous Co(OH)F/Ni(OH)2: A new hybrid for supercapacitors

Cited by 92 publications

References 48 publications

Electrochemical measurements of synthesized nanostructured β-Ni(OH)2 using hydrothermal process and activated carbon based nanoelectroactive materials

Electrochemical measurements of synthesized nanostructured β-Ni(OH)2 using hydrothermal process and activated carbon based nanoelectroactive materials

3D Carbon Electrode with Hierarchical Nanostructure Based on NiCoP Core‐Layered Double Hydroxide Shell for Supercapacitors and Hydrogen Evolution

A novel green chemistry gelation method for polyvinyl pyrrolidone (PVP) and dimethylpolysiloxane (silicone): microwave-induced in-liquid-plasma

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