Utility of ZnGa<sub>2</sub>O<sub>4</sub> Nanoparticles Obtained Hydrothermally for Preparation of GaN:ZnO Solid Solution Nanoparticles and Transparent Films

Nishimura, Yukiho; Masubuchi, Yuji; Yin, Shu

doi:10.1002/ejic.201900045

Cited by 12 publications

(4 citation statements)

References 36 publications

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“…However, the possibility cannot be excluded for the presence of a great deal of N vacancy (V N ) in the oxynitrides, especially for the samples of 2.5 g- and 1.0 g-ZnGaNO. The existence of V N in (GaN) 1– x (ZnO) x has been suggested in a few reports recently. − The quantitative estimation of V N , however, is still difficult because of the lack of solid experimental evidence and theoretical investigation. No XPS peak related to V N has been identified in GaN or (GaN) 1– x (ZnO) x .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)_0.5(ZnO)_0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Wang

Zhang

et al. 2020

Inorg. Chem.

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In this study, zinc–gallium oxynitrides with a Zn:Ga mole ratio of 1:1 [(GaN)0.5(ZnO)0.5] were synthesized from a Zn/Ga/CO3 layered double hydroxide (LDH) precursor. The microstructure and photoactivity of the (GaN)0.5(ZnO)0.5 particles were tuned by adjusting the nitridation conditions of the LDH. It is revealed that the quantity of the LDH, or, equivalently, the partial pressure of the water during nitridation, plays a pivotal role in the defect structure of the obtained oxynitrides. A reduction in the quantity of the LDH precursor can effectively suppress the formation of defects including Ga(Zn)–O bonding, bulk anion vacancies, and surface-deposited Ga/ON···VGa complexes, leading to a better charge-separation efficiency for the photogenerated electron–hole pairs in the oxynitride. Furthermore, a suitable introduction of methane during nitridation would not only increase the crystallinity of the bulk materials but also enhance the density of the surface oxygen vacancy (VO), which would raise the charge-injection efficiency by working as an electron trap and a reaction site to form O2 •–. O2 •–, as well as photogenerated holes, have been proven to be the dominant active species for the photodegradation of phenol. 25CH4-ZnGaNO, with the lowest density of bulk defects and the highest density of surface VO, exhibited the best photoactivity under visible-light irradiation for the photodegradation of Rhodamine B and phenol. The obtained surface-VO-rich (GaN)0.5(ZnO)0.5 particles can be applied as a high-performance visible-light-driven photocatalyst in the photodegradation of organic pollutants.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)_0.5(ZnO)_0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Wang

Zhang

et al. 2020

Inorg. Chem.

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“…Nanomaterials have better performance in the above aspects: (1) providing a large specific surface area to facilitate light absorption and full contact with reaction substrates; (2) possessing a large number of catalytic active sites, which is conductive to promoting catalytic reactions; (3) nanostructures can reduce the distance of the electron diffusion (enhance the charge mobility), thereby generating more electronhole pairs (reducing the probability of electron-hole recombination); (4) some of these nanomaterials also have excellent chemical stability. [53][54][55][56][57][58][59] In the following section, the common photocatalysts used for CO 2 reduction are introduced individually according to material classes (including nanomaterial photocatalysts). The properties of different materials are shown in Table 2.…”

Section: Photocatalytic Materials Used For Co 2 Reductionmentioning

confidence: 99%

Recent advances in novel materials for photocatalytic carbon dioxide reduction

Lu,

Zhang,

Liu

et al. 2024

Carbon Neutralization

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The conversion of CO2 into chemical fuels, which can be stored and utilized through photocatalysis, represents an effective, environmentally friendly, and sustainable means to address both environmental concerns and energy shortages. CO2, as a stable oxidation product, poses challenges for reduction through light energy alone, necessitating the use of catalysts. Thus, a crucial aspect of CO2 photocatalytic reduction technology lies in the development of effective photocatalysts. Based on the basic principle of PCRR (photocatalytic CO2 reduction reaction), the review provides a detailed introduction to the core issues in PCRR process, including the relationship between band gap and catalyst reduction performance, effective utilization of photogenerated carriers, product selectivity, and methods for product analysis. Then, the recent research progresses of various photocatalysts are reviewed in the form of research examples combined with the above basic principles. Finally, this review summarizes and provides insights into the effective techniques for enhancing the photocatalytic activity of CO2, while also offering future prospects in this field.

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“…In recent years, precise control of the bandgap and electrical/optical properties of semiconductor materials to obtain an optimal balance between optical absorption and redox potentials can be achieved by a phase transformation from TMOs [47][48][49]. Introduction of N into oxides also leads to the formation of oxynitride or nitride materials [50,51]. Many researchers have focused on the fabrication of oxynitride by topochemical ammonolysis reaction from transition metal oxides to adjust the energy band structure, such as (Ga 1−x Zn x )(N 1−x O x ) [52], (Zn 1+x Ge)(N 2 O x ) [53], ATaO 2 N (A = Ca, Sr, Ba) [54], Na x La 1−x TaO 1+2x N 2−2x [55] and so on.…”

Section: Phase Transformation By N Interactionmentioning

confidence: 99%

Recent Advances in Ternary Metal Oxides Modified by N Atom for Photocatalysis

2022

Self Cite

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Ternary metal oxides (TMOs) with flexible band structures are of significant potential in the field of photocatalysis. The efficient utilization of renewable and green solar energy is of great importance to developing photocatalysts. To date, a wide range of TMOs systems has been developed as photocatalysts for water and air purification, but their practical applications in visible light-assisted chemical reactions are hindered mainly by its poor visible light absorption capacity. Introduction of N atoms into TMOs can narrow the band-gap energy to a lower value, enhance the absorption of visible light and suppress the recombination rate of photogenerated electrons and holes, thus improving the photocatalytic performance. This review summarizes the recent research on N-modified TMOs, including the influence of N doping amounts, N doping sites, and N-induced phase transformation. The introduced N greatly tuned the optical properties, electronic structure, and photocatalytic activity of the TMOs. The optimal N concentration and the influence of N doping sites are investigated. The substitutional N and interstitial N contributed differently to the band gap and electron transport. The introduced N can tune the vacancies in TMOs due to the charge compensation, which is vital for inducing different activity and selectivity. The topochemical ammonolysis process can convert TMOs to oxynitride with visible light absorption. By altering the band structures, these oxynitride materials showed enhanced photocatalytic activity. This review provides an overview of recent advances in N-doped TMOs and oxynitrides derived from TMOs as photocatalysts for environmental applications, as well as some relevant pointers for future burgeoning research development.

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Utility of ZnGa₂O₄ Nanoparticles Obtained Hydrothermally for Preparation of GaN:ZnO Solid Solution Nanoparticles and Transparent Films

Cited by 12 publications

References 36 publications

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)_0.5(ZnO)_0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)_0.5(ZnO)_0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Recent advances in novel materials for photocatalytic carbon dioxide reduction

Recent Advances in Ternary Metal Oxides Modified by N Atom for Photocatalysis

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Utility of ZnGa2O4 Nanoparticles Obtained Hydrothermally for Preparation of GaN:ZnO Solid Solution Nanoparticles and Transparent Films

Cited by 12 publications

References 36 publications

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)0.5(ZnO)0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)0.5(ZnO)0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Recent advances in novel materials for photocatalytic carbon dioxide reduction

Recent Advances in Ternary Metal Oxides Modified by N Atom for Photocatalysis

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Utility of ZnGa₂O₄ Nanoparticles Obtained Hydrothermally for Preparation of GaN:ZnO Solid Solution Nanoparticles and Transparent Films

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)_0.5(ZnO)_0.5 Particles with Enhanced Visible-Light Photodegradation Performance

Synthesis of Surface-Oxygen-Vacancy-Rich (GaN)_0.5(ZnO)_0.5 Particles with Enhanced Visible-Light Photodegradation Performance