Synthesis, characterizations, and electrochemical studies of ZnO/reduced graphene oxide nanohybrids for supercapacitor application

Rai, S.; Bhujel, Rabina; Khadka, Meghna; Chetry, R.L.; Swain, Bibhu P.; Biswas, Joydeep

doi:10.1016/j.mtchem.2021.100472

Cited by 20 publications

(17 citation statements)

References 63 publications

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“…The capacitance value was low at 113 FÁg À1 at a current density of 0.1 AÁg À1 . 27 Li et al 28 demonstrated a potential window of 1.6 V similar to that in work by Xiong et al 25 for nitrogen-doped ZnO quantum dots without using NiCo-LDH. It should be noted that, owing to the batterylike characteristics of a flexible supercapacitor, instead of specific capacitance, Li et al 28 correctly indicated it as a specific capacity (41 mAhÁg À1 ) at a current density of 5 AÁg À1 .…”

Section: Introductionsupporting

confidence: 58%

“…The capacitance values and wide potential window of 1.6 V could be attributed to the battery‐like characteristics of NiCo‐LDH. Rai et al 27 demonstrated the electrochemical performance of a ZnO/rGO composite powder synthesized using a hydrothermal process and later deposited on a glassy carbon electrode. The capacitance value was low at 113 F·g −1 at a current density of 0.1 A·g −1 27 .…”

Section: Introductionmentioning

confidence: 99%

“…Rai et al 27 demonstrated the electrochemical performance of a ZnO/rGO composite powder synthesized using a hydrothermal process and later deposited on a glassy carbon electrode. The capacitance value was low at 113 F·g −1 at a current density of 0.1 A·g −1 27 . Li et al 28 demonstrated a potential window of 1.6 V similar to that in work by Xiong et al 25 for nitrogen‐doped ZnO quantum dots without using NiCo‐LDH.…”

Section: Introductionmentioning

confidence: 99%

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Wearable fabric supercapacitors based on CNTs and polyhedral ZnO with a wide potential window

Samuel

Joshi

Park

et al. 2022

Intl J of Energy Research

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Summary Wearable electronic devices such as health monitors, sensors, and e‐skin can be powered by lightweight, high‐power supercapacitors. Using a binder‐free and low‐temperature hydrothermal method, polyhedral ZnO nanoparticles were grown on carbon nanotube (CNT)‐decorated cotton fabric, which is friendly to human skin and highly wearable, inexpensive, and thus commercially viable. The concentration of the starting material, zinc acetate, was varied to optimize the electrochemical performance. The evenly spaced polyhedral ZnO facilitated efficient permeation of the electrolyte into the active material. The fabric filaments were decorated with CNTs to enhance electron transfer and the overall electrochemical processes. The symmetric cell comprised of cotton fabric decorated with ZnO polyhedron/CNT showed no discernible change in the cyclic voltammetry curves even after 500 bending cycles, demonstrating the mechanical durability of the electrode. The potential window of 1.6 V using a Na2SO4/K2SO4 aqueous dual‐ion electrolyte improved the long‐term electrochemical stability and increased the energy storage capacity. The capacitance retention was 94% after 5000 cycles at a current density of 1 A·g−1, indicating long‐term electrochemical stability. A specific capacitance of 375 F·g−1 at a current density of 5 A·g−1 and energy density of 33.3 Wh·kg−1 at a power density of 2000 W·kg−1 were recorded for the optimized electrode. Highlights Polyhedral ZnO was grown on cotton fabric using a hydrothermal process. The electrochemical performance was optimized by varying the zinc acetate concentration. The highest specific capacitance was 375 F·g−1 at a current density of 5 A·g−1. Under optimal conditions, the capacitance retention was 94% at N = 5000 cycles. The energy density of the electrode was as high as 33.3 Wh·kg−1.

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wearable fabric supercapacitors based on CNTs and polyhedral ZnO with a wide potential window

Samuel

Joshi

Park

et al. 2022

Intl J of Energy Research

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“…From this curve, the cell capacitance values have been calculated to be 138.5, 137.5, 111, 87, 74, 59, and 43 F/g. Further, the cyclic stability of the SSC has been tested for 10,000 cycles, which showed a high cyclic stability of 101% with a Coulombic efficiency of 99% (Figure c), which is much higher than those reported earlier. ,,,− Such a high cyclic stability might be attributed to the strong chemical interactions of N-ZO and N-rGO through Zn–C/Zn–O–C/O–Zn-N bonds, as was evidenced by XPS spectroscopy. To study the change in impedance parameters, the Nyquist plots were recorded before and after 10,000 cycles (Figure d).…”

Section: Resultsmentioning

confidence: 76%

In Situ Wet Synthesis of N-ZnO/N-rGO Nanohybrids as an Electrode Material for High-Performance Supercapacitors and Simultaneous Nonenzymatic Electrochemical Sensing of Ascorbic Acid, Dopamine, and Uric Acid at Their Interface

Thareja

Kumar

2021

J. Phys. Chem. C

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The present manuscript reports one-pot greener in situ synthesis of nanohybrids (N-GZO320) consisting of nitrogendoped ZnO (N-ZO) particles (with an average size of 16 nm) coated on nitrogen-doped reduced graphene oxide (N-rGO) nanosheets. The simultaneous reduction of GO and doping of nitrogen in both the components of nanohybrids has been performed by employing an environmentally benign biomolecule, glycine, as a reducing agent, to produce N-ZO/N-rGO (N-GZO320) nanohybrids. The formation of N-GZO320 nanohybrids involved chemical interactions between their components by making Zn−C/Zn−O−C/O−Zn−N bonds as confirmed by Raman, Fourier transform infrared, and X-ray photoelectron spectroscopy (XPS) analyses. The as-synthesized nanohybridbased symmetric supercapacitor in a "water-in-salt" (17 m NaClO 4 ) electrolyte demonstrated fairly high capacitance with a relatively much higher energy density of 140.2 Wh/kg at 638 W/kg as compared to bare N-ZO (19 Wh/kg at 500 W/kg), which is attributed to the enhanced intrinsic electrical conductivity and wettability of the former. The integration of both N-ZO and N-rGO through Zn−C/Zn−O−C/O−Zn−N bonds in the nanohybrids thus contributes to attaining the novel electrochemical features of a high cyclic stability of 101% after 10,000 cycles for a high cell voltage of 2.7 V. Their high energy storage capabilities are evidently revealed by the lighting of green (90), yellow (74), and white (54) light-emitting diodes. The presence of different N centers along with oxygen vacancies at the interface of nanohybrids, as confirmed by XPS and electron paramagnetic resonance analyses, respectively, assisted in the nonenzymatic simultaneous detection of the mixture of biomolecules involved in human metabolic activity (ascorbic acid, dopamine, and uric acid) with limits of detection at 10 nM, 200 nM, and 10 μM, respectively, in contrast to that of bare N-ZO (which was ineffective to bring their separation).

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“…Proc. 2022, 6, 1 2 of 8 another feasible approach can be accomplished via the combination of ZnO with other inorganic porous materials, such as graphene oxide [7], single-walled carbon nanotubes [8], fullerenes [9], and Pd [10], which can successfully improve its photocatalytic activity. For this purpose, zeolite is considered a good candidate for the support of photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

ZnO-Incorporated ZSM-5 for Photocatalytic CO2 Reduction into Solar Fuels under UV–Visible Light

et al. 2021

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Synthesis, characterizations, and electrochemical studies of ZnO/reduced graphene oxide nanohybrids for supercapacitor application

Cited by 20 publications

References 63 publications

Wearable fabric supercapacitors based on CNTs and polyhedral ZnO with a wide potential window

Wearable fabric supercapacitors based on CNTs and polyhedral ZnO with a wide potential window

In Situ Wet Synthesis of N-ZnO/N-rGO Nanohybrids as an Electrode Material for High-Performance Supercapacitors and Simultaneous Nonenzymatic Electrochemical Sensing of Ascorbic Acid, Dopamine, and Uric Acid at Their Interface

ZnO-Incorporated ZSM-5 for Photocatalytic CO2 Reduction into Solar Fuels under UV–Visible Light

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