Solvothermal synthesis of NiCo-layered double hydroxide nanosheets decorated on RGO sheets for high performance supercapacitor

Cai, Xiaoqing; Shen, Xiaoping; Ma, Lianbo; Ji, Zhenyuan; Xu, Chen; Yuan, Aihua

doi:10.1016/j.cej.2015.01.072

Cited by 431 publications

(127 citation statements)

References 50 publications

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“…3). These diffraction patterns are well matched to the hydrotalcite phase of LDHs and are in good agreement with other reported works [17][18][19].…”

Section: Resultssupporting

confidence: 92%

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

Mustafa

Tahira

Adam

et al. 2019

Journal of Solid State Chemistry

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A B S T R A C TZinc oxide (ZnO) nanostructures are widely investigated for photocatalytic applications but the functional properties are limited by the fast carrier recombination rate, which is an intrinsic property of ZnO. To optimize the recombination rate of ZnO, a study is carried out in which it is covered with Ni-Fe layered double hydroxides and synergistic effects are created which boosted the photocatalytic activity of ZnO. The nanostructured materials are synthesized by the low temperature aqueous chemical growth and electrodeposition methods. These nanostructures are characterized by scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) technique. SEM study has revealed a Ni-Fe LDH coated ZnO NRs. The powder XRD has showed a cubic phase of the Ni-Fe layered double hydroxide on the ZnO NRs having an excellent crystalline quality. The optical characterization has shown low scattering of light for the Ni-Fe LDH coated ZnO NRs sample. The sample prepared with deposition time of 25 s showed excellent photochemical water splitting properties compared to counter photoanodes in alkaline media. The photo response was highly stable and fast. The incident photon to current conversion efficiency for the photo-anode of Ni-Fe(LDHs)/ZnO over 25 s was 82% at a maximum absorption of 380 nm compared to the pristine ZnO NRs which has 70% at the same wavelength. This study is providing a simple, cost effective, earth abundant and environment friendly methodology for the fabrication of photo-anodes for diverse applications specifically water oxidation and solar radiation driven water splitting.

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“…3). These diffraction patterns are well matched to the hydrotalcite phase of LDHs and are in good agreement with other reported works [17][18][19].…”

Section: Resultssupporting

confidence: 92%

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

Mustafa

Tahira

Adam

et al. 2019

Journal of Solid State Chemistry

View full text Add to dashboard Cite

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“…Much attention has been paid to LDH because of their adjustable chemical composition, anion exchange ability, tunable charge density, and multifuntionalities, and they have been widely used in the fields of catalysis, optics, electrochemistry, adsorption, anion exchange, and polymer additives. [36][37][38][39][40] LDH have already been used as precursors to prepare different kinds of mixed metal oxides, [41][42][43] however, to the best of our knowledge, they are seldom adopted to fabricate p-n heterojunctions.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

et al. 2017

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The development of highly active, sensitive and durable gas sensing materials for the detection of volatile organic compounds (VOCs) is extremely desirable in gas sensors. Herein, a series of mesoporous hierarchical Co3O4-TiO2 p-n heterojunctions have been prepared for the first time via the facile thermal conversion of hierarchical CoTi layered double hydroxides (CoTi-LDH) precursors at 300-400 ºC. The resulting Co3O4-TiO2 nanocomposites showed superior sensing performance towards toluene and xylene in comparison with Co3O4 and TiO2 at low temperature, and the sample with a Co/Ti molar ratio of 4 shows optimal response (Rg/Ra = 113, Rg and Ra denote the sensor resistance in a target gas and in air, respectively) to 50 ppm xylene at 115 ºC. The ultrahigh sensing activity of theses Co3O4-TiO2 p-n heterojunctions originates from their hierarchical structure, high specific surface area (>120 m 2 g −1 ), and the formation of numerous p-n heterojunctions, which results in full exposure of active sites, easy adsorption of oxygen and target gases, and large modulation of resistance. Importantly, hierarchical Co3O4-TiO2 heterojunctions possess advantages of simple preparation, structural stability, good selectivity and long-term durability. Therefore, this work provides a facile approach for the preparation of hierarchical Co3O4-TiO2 p-n heterojunctions with excellent activity, sensitivity and durability, which can be used as a promising material for the development of high-performance gas sensors.

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“…[1][2][3][4][5][6] Particularly, Ni-Co mixed oxides such as NiCo 2 O 4 have been attracting tremendous interest in electrochemical capacitors due to the tendency to form high electroactive surface area structures with the presence of various valence state of nickel and cobalt (Ni 2+ /Ni 3+ and Co 2+ /Co 3+ ). 7,8 Moreover, the Ni-Co mixed oxides possess much higher electrical conductivity of 10 -1 -10 S cm -1 than the monometallic NiO and Co 3 O 4 (10 -3 -10 -2 S cm -1 ).…”

Section: Introductionmentioning

confidence: 99%

Multishelled Nickel–Cobalt Oxide Hollow Microspheres with Optimized Compositions and Shell Porosity for High-Performance Pseudocapacitors

Wang

Shi

et al. 2016

ACS Appl. Mater. Interfaces

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Nickel-cobalt oxides/hydroxides have been considered as promising electrode materials for a high-performance supercapacitor. However, their energy density and cycle stability are still very poor at high current density. Moreover, there are few reports on the fabrication of mixed transition-metal oxides with multishelled hollow structures. Here, we demonstrate a new and flexible strategy for the preparation of hollow Ni-Co-O microspheres with optimized Ni/Co ratios, controlled shell porosity, shell numbers, and shell thickness. Owing to its high effective electrode area and electron transfer number (n(3/2) A), mesoporous shells, and fast electron/ion transfer, the triple-shelled Ni-Co1.5-O electrode exhibits an ultrahigh capacitance (1884 F/g at 3A/g) and rate capability (77.7%, 3-30A/g). Moreover, the assembled sandwiched Ni-Co1.5-O//RGO@Fe3O4 asymmetric supercapacitor (ACS) retains 79.4% of its initial capacitance after 10 000 cycles and shows a high energy density of 41.5 W h kg(-1) at 505 W kg(-1). Importantly, the ACS device delivers a high energy density of 22.8 W h kg(-1) even at 7600 W kg(-1), which is superior to most of the reported asymmetric capacitors. This study has provided a facile and general approach to fabricate Ni/Co mixed transition-metal oxides for energy storage.

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Solvothermal synthesis of NiCo-layered double hydroxide nanosheets decorated on RGO sheets for high performance supercapacitor

Cited by 431 publications

References 50 publications

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

Multishelled Nickel–Cobalt Oxide Hollow Microspheres with Optimized Compositions and Shell Porosity for High-Performance Pseudocapacitors

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Solvothermal synthesis of NiCo-layered double hydroxide nanosheets decorated on RGO sheets for high performance supercapacitor

Cited by 431 publications

References 50 publications

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

Multishelled Nickel–Cobalt Oxide Hollow Microspheres with Optimized Compositions and Shell Porosity for High-Performance Pseudocapacitors

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Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance