Co-doped NiO nanoflake array films with enhanced electrochromic properties

Zhang, Jun; Cai, Guofa; Zhou, Ding; Tang, Hong; Wang, Xiuli; Gu, C.D.; Tu, Jiangping

doi:10.1039/c4tc01033g

Cited by 165 publications

(90 citation statements)

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“…The Co 2+ partially substitutes for Ni 2+ in the metal hydroxide-oxide, which may result in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity. [20][21][22] Another approach is to increase the specic surface area by construction of a mesoporous structure, which is believed to improve the interface contact efficiency between active sites and electrolytes, to serve as reservoirs for electrolyte ions to facilitate ion and electron transport, and to provide spaces for volume expansion during the cycling process. 6 Herein, we present a facile and green design to synthesize a Co-doped Ni(OH) 2 interconnected nanosheet network using a laser-induced cobalt colloid as a doping precursor, followed by an aging treatment in a nickel ion and sodium thiosulfate hybrid medium at room temperature (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

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Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Liang

et al. 2016

J. Mater. Chem. A

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Morphology control and impurity doping are two widely applied strategies to improve the electrochemical performance of nanomaterials. Herein, we report an environmentally friendly approach to obtain Co-doped Ni(OH) 2 nanosheet networks using a laser-induced cobalt colloid as a doping precursor followed by an aging treatment in a hybrid medium of nickel ions. The shape and specific surface area of the doped Ni(OH) 2 can be successfully adjusted by changing the concentration of sodium thiosulfate. Furthermore, a Co-doped Ni(OH) 2 nanosheet network was further converted into Co-doped NiO with its pristine morphology retained via facile thermal decomposition in air. The structure and electrochemical performance of the as-prepared samples are investigated with scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectroscopy, the nitrogen adsorption-desorption isotherm technique, and electrochemical measurements. The Codoped Ni(OH) 2 electrode shows an ultrahigh specific capacitance of 1421 F g À1 at a current density of 6 A g À1 , and a good retention level of 76% after 1000 cycles, in sharp contrast with only a 47% retention level of the pure Ni(OH) 2 electrode at the same current density. In addition, the Co-doped NiO electrode exhibits a capacitance of 720 F g À1 at 6 A g À1 and 92% retention after 1000 cycles, which is also superior to the corresponding values of relevant pure NiO electrodes. The Co 2+ partially substitutes for Ni 2+ in the metal hydroxide and oxide, resulting in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity of Ni(OH) 2 and NiO. Moreover, such novel mesoporous nanosheet network structures are also able to enlarge the electrode-electrolyte contact area and shorten the path length for ion transport. The synergetic effect of these two results is responsible for the observed ultrahigh pseudocapacitor performance.

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Section: Introductionmentioning

confidence: 99%

“…(a) CV curves of Co-doped NiO at scan rates of 5,10,20,30,40, and 50 mV s À1 ; (b) galvanostatic discharge curve of Co-doped NiO at current densities of 6, 10, 15, and 20 A g À1 ; (c) Nyquist plots of Co-doped NiO; (d) cycling performance of Co-doped NiO at a discharge current density of 6 A g À1 . …”

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confidence: 99%

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Liang

et al. 2016

J. Mater. Chem. A

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“…The NiO particle sizes of the films were sub-tens nm order ( Figure 3); thus, it was inferred that the resulting composite films showed photochromic property. Co addition decreased the initial transmittance of the films; this result was assumed to have improved p-type conductivity of NiO particle in composites by appropriate Co doping (Zhang et al, 2014). The films with Co/Ni ratios of 0.005 and 0.01 showed a large transmittance modulation, and the film with Co/Ni ratio of 0.02 showed a small transmittance modulation.…”

Section: Resultsmentioning

confidence: 99%

“…A previous report showed that the addition of Cobalt (Co) to NiO films affected its electrochromic properties, resulting in large transmittance modulation, high coloration efficiency, fast switching speed, and so on (Zhang et al, 2014). Similarly, Co addition is expected to have similar effects on the optical characteristics of NiO photochromism.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Photochromic Property of Nickel Oxide-Based Photochromic Composite Films by Cobalt Addition

Miyazaki¹,

Eimori²,

Matsuura³

et al. 2017

JMSR

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Nickel oxide (NiO)-based composite films with various Cobalt/Nickel (Co/Ni) ratios were fabricated, and the photochromic properties of the resulting films were evaluated. The NiO particle sizes in the composite films with Co/Ni ratios of 0~0.02 were 40~70 nm. Increase in the Co addition ratio to the composite films caused a decrease in the initial transmittance of the films, and the films with Co/Ni ratio of 0.005 and 0.01 showed a larger transmittance modulation. Co addition caused an increase in the bleaching and coloring rates, which were the largest in the film with Co/Ni ratio of 0.005.

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“…The decreased diameters of the Mn 2 O 3 nanowires reveal that the cobalt and nickel ions have played a pivotal role during the growth process of the Mn 2 O 3 . 34,35 For doped Mn 2 O 3 , the incorporation of Co 2+ /Ni 2+ leads to blue shis of the lattice Raman vibrational peak positions (Fig. Inductively coupled plasma (ICP) analysis indicated that the molar ratio of doping ions in Mn 2 O 3 nanostructures are 1.34% for Ni-doped Mn 2 O 3 , which is lower than theoretical doping and 4.95% for Co-doped Mn 2 O 3 , which is close to the initial reactant composition ( Table 1 in ESI †).…”

Section: Characteristics Of Nanowiresmentioning

confidence: 99%

Solvothermal synthesis of 1D nanostructured Mn₂O₃: effect of Ni²⁺ and Co²⁺ substitution on the catalytic activity of nanowires

et al. 2015

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In this paper, cation modified one dimensional Mn 2 O 3 nanowires were synthesized via a solvothermal synthesis and calcination free from the template-assisted method. The samples were characterized in detail by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS). XRD results revealed the homogeneity of Ni-Mn-O/Co-Mn-O solid solutions. By introducing the two different cations the Mn 2 O 3 nanowires can be freely manipulated. The H 2 -TPR measurement showed the enhanced reduction behaviors of the doped manganese oxide (Mn 2 O 3 ) samples. The presence of Ni 2+ and Co 2+ produced lattice defects and promoted the production of oxygen vacancies, which explained the results that Ni 2+ /Co 2+ doped Mn 2 O 3 showed higher catalytic activity than the pure sample. † Electronic supplementary information (ESI) available: The surface areas and the compositional data of the as prepared Mn 2 O 3 samples. SEM and XRD of Ni-doped Mn 2 O 3 and Co-doped Mn 2 O 3 nanowires aer catalysis for 6 times. Catalytic performance of pure Mn 2 O 3 nanowires in different runs. SeeFig. 10 Catalytic performance of Co-doped Mn 2 O 3 (a) and Ni-doped Mn 2 O 3 (b) in different runs. 66276 | RSC Adv., 2015, 5, 66271-66277 This journal is

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Co-doped NiO nanoflake array films with enhanced electrochromic properties

Abstract: Co-doped NiO nanoflake array films, which exhibit improved electrochromic performance with antireflective ability, are fabricated by chemical bath deposition.

Cited by 165 publications

References 69 publications

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Improvement in Photochromic Property of Nickel Oxide-Based Photochromic Composite Films by Cobalt Addition

Solvothermal synthesis of 1D nanostructured Mn₂O₃: effect of Ni²⁺ and Co²⁺ substitution on the catalytic activity of nanowires

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Co-doped NiO nanoflake array films with enhanced electrochromic properties

Abstract: Co-doped NiO nanoflake array films, which exhibit improved electrochromic performance with antireflective ability, are fabricated by chemical bath deposition.

Cited by 165 publications

References 69 publications

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Improvement in Photochromic Property of Nickel Oxide-Based Photochromic Composite Films by Cobalt Addition

Solvothermal synthesis of 1D nanostructured Mn2O3: effect of Ni2+ and Co2+ substitution on the catalytic activity of nanowires

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Solvothermal synthesis of 1D nanostructured Mn₂O₃: effect of Ni²⁺ and Co²⁺ substitution on the catalytic activity of nanowires