NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 26
·11802-11811
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IF 2.7
Chenxia Xu,Jianhua Lv,Jidong Liu,Bao Guo,Wensong Li
Ga2O3/MCM-41-x (x = 0.4, 0.5, 0.6) heterogeneous catalysts, each with varying levels of Br doping, were synthesized using mesoporous molecular sieves (MCM-41) as a carrier and employed in the synthesis of propylene carbonate (PC) from propylene oxide (PO) and carbon dioxide (CO2). The reaction was conducted under solvent-free and additive-free conditions. Various techniques were utilized to characterize the catalysts’ chemical composition, morphology, and structure. The effects of varied reaction conditions on PO conversion and PC selectivity using Ga2O3/MCM-41-0.5 catalysts were investigated. Under the reaction conditions of 120 °C, 3.5 MPa, 10 h and catalyst dosage of 2.6 wt%, the PO conversion and PC selectivity reached 99.7% and 99.1%, respectively. The catalytic impact correlates strongly with the doping amounts of Ga2O3 and Br, primarily due to the interaction of Ga2O3 with the surface of MCM-41, leading to the generation of more basic sites and, consequently, a greater abundance of alkali centers. As a nucleophilic reagent, Br functions synergistically with Ga2O3/MCM-41, augmenting the ring-opening rate of PO and improving the activation ability of CO2. The stability of the catalyst underwent evaluation, revealing a slight decrease in activity after repeated use. The reaction mechanism underlying PC synthesis catalyzed by Ga2O3/MCM-41-0.5 was speculated.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zeyulin Zhang,Dinghe Liu,Yiru Yan,Liru Zeng,Hao Chen,Qingwen Song,Dazheng Chen,Chunxiang Zhu,Chunfu Zhang,Yuming Zhang,Yue Hao
Gallium oxide (Ga 2 O 3 ) film exhibiting the solar-blind absorption cutoff characteristic holds considerable potential for application in UV photodetectors . The material defects in the device will introduce the recombination region for the photodetector, especially at the interface of the Ga₂O₃ heterojunction . The photogenerated carriers , generated within the Ga 2 O 3 film, will inevitably be influenced by these high recombination centers during their transportation. Avoiding or minimizing this region can improve the performance of the photodetector. The p-n junction, with its depletion region , generates an electric field that drives the carriers away from the recombination region. However, due to the Ga 2 O 3 p-type doping difficulty, our work focuses on the growth of single-crystal NiO/β-Ga₂O₃ films by Mist-CVD and the fabrication of field-controlled photodetectors. The hole concentration in the NiO film is adjusted by doping with different concentrations of Li⁺. Compared with a photodetector without the NiO interlayer, the performance of the photodetector with the structure of NiO (1 % Li⁺-doped)/β-Ga₂O₃ exhibits a significant improvement, which achieved the maximum responsivity of 1002.5 A/W, and a high peak detectivity of 3.31 × 10 15 Jones.
研究领域:
半导体物理
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光电材料
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凝聚态物理
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薄膜器件
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紫外探测技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2025
·
IF 4.7
Zeyu Yang,Jizhou Yang,Haibo Fan
The photocatalytic degradation of Rhodamine B (RhB) from a one-step hydrothermal prepared ZnGa2O4/Ga2O3 with a double shell hollow sphere structure has been investigated. It is found that this structure can greatly improve the photocatalytic performance through the formation of S-scheme heterojunction in the interface between ZnGa2O4 and Ga2O3. By optimizing the feed ratio, the maximum degradation rate of RhB is 0.1133 min−1, which is nearly 2 times higher than Ga2O3 monomer photocatalyst, 5 times higher than ZnGa2O4 monomer catalytic performance, and 96 times higher than RhB self-degradation rate. Capture experiments show that h+ plays a key role in the efficient decomposition of RhB reactive groups. This study provides a new idea and a simple preparation method of novel ZnGa2O4/Ga2O3 S-scheme heterojunction for efficient photocatalytic degradation of organic pollutants.
研究领域:
材料科学
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环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 41
·1804128
·
IF 13.325
Junjie Ma,Meijuan Zheng,Cong Chen,Ziqiang Zhu,Xiaolu Zheng,Zhiliang Chen,Yaxiong Guo,Chang Liu,Yanfa Yan,Guojia Fang
Inverted planar perovskite solar cells (PSCs) exhibit advantages in terms of simple device fabrication, good reproducibility, and less hysteresis. However, there still remain challenges to passivate the trap states within the perovskite film and reduce interface instability arising from penetration of moisture and the diffusion of metal electrode. In this work, perovskite passivation is reported using gradiently distributed nonfullerene electron-rich Lewis bases small molecule IDIC (a π-conjugated Lewis base: indacenodithiophene end-capped with 1.1-dicyanomethylene-3-indanone), which is realized through an antisolvent dropping process. Additionally, an inorganic wide band gap Ga 2 O 3 is introduced as a tunneling nanolayer into interface between the metal electrode and electron transport layer that effectively passivate interface and mitigate moisture and metal ion diffusion. These treatments enable the fabrication of CH 3 NH 3 PbI 3 -based inverted PSCs with excellent power conversion efficiencies up to 19.86% as well as enhanced ambient stability. This work provides new strategies to improve the performance and stability for the inverted PSCs.
研究领域:
材料科学
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能源技术
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Minghu Zhao,Jiuhu Zhao,Ran Ding,Rongshu Zhu,Haiyan Li,Zhi Li,Jingwen Zhang,Yongji Zhu,Huiying Li
The existence of sulfur dioxide and water vapor in the flue gas generated from waste-to-energy stations could lead to catalyst deactivation , which has adverse effects on NO x removal. It is thus particularly important to study the reaction mechanism of catalyst resistance to poisoning. Herein, we report the mechanism of In-Co 3 O 4 -Ga 2 O 3 /H-Beta catalyst to SO 2 and H 2 O resistance in the selective catalytic reduction (SCR) of NO x by CH 4 . The catalyst could achieve 74.6% NO x removal efficiency in the presence of 100 ppm SO 2 and 5% H 2 O. In this catalyst, Co 3 O 4 is attributed to enhancing the reversible poisoning of SO 2 and CH 4 activation and increasing the number of Brønsted acid sites by decomposing H 2 O. However, the InO + active center was still eroded by a small amount of water vapor, leading to a reduction in NO x removal efficiency. The addition of Ga 2 O 3 primarily provided an important intermediate NO 2 for CH 4 -SCR reaction and reduced the aggregates of Co 3 O 4 to increase the exposure of indium sites, and could reduce a part of SO 2 to S 2− . This study provides a good candidate for preparing catalysts with superior resistance towards SO 2 and H 2 O for CH 4 -SCR.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 1
·349-357
·
IF 11.301
Wei Ping Wang,Le Xin Song,Yao Li,Yue Teng,Juan Xia,Fang Wang,Nan Ning Liu
Here we report a novel synthesis of hollow high-quality β-Ga2O3 nanorings based on an interesting structural evolution from concave Ga-MOF nanodisks. The concave low-crystallinity nanodisks were constructed by non-classical crystallization with particle attachment aid. Further, we propose the evolution mechanism from the Ga-MOF nanostructure to the gallium oxide nanostructure based on the outward contraction of nanoparticles. This synthesis method is highly straightforward and provides high yields. It is important to note that the β-Ga2O3 nanorings exhibit good heterogeneous catalytic activity for epoxidation of alkenes. A new oxygen transfer pathway was illustrated to describe the catalytic process based on density functional theory.
研究领域:
材料科学
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催化化学
·
理论化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fenqi Du,Dongmei Yang,Tianxin Kang,Yuxin Ren,Peng Hu,Jiaming Song,Feng Teng,Haibo Fan
To effectively and selectively remove the cationic organic pollutant from wastewater, SiO 2 /Ga 2 O 3 composite samples were synthesized via a facile electrospinning method. The obtained composite exhibited a superior removal efficiency for cationic rhodamine B (RhB) dye and methylene blue (MB) dye compared with Ga 2 O 3 , resulting from the variation of surface charge property of composite and the improvement of the separation efficiency of photogenerated electron-hole pairs. Under the synergistic effect of electrostatic adsorption and photocatalysis, more than 95% of RhB and MB dyes were removed after irradiation with the Xe lamp for 30 min. The selective removal mechanism of cationic dye was studied by testing the adsorption property, zeta potential and photoluminescence (PL) spectra of the synthesized samples. This study provides a novel and effective approach to the synthesis of high-performance remover for cationic dye based on Ga 2 O 3 nanomaterials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Kaizheng Gao,Feihua Liu,Fu Lv,Nuomei Li,Man Liu,Ziheng Ye,Minghan Yu,Rui Yin,Chen Zhang,Yuhui Huang,Weiwei Zhao
The rapid development of advanced electronics, hybrid vehicles, etc. has imposed heightened requirements on the performance of polymer dielectrics. However, the energy density (Ue) of polymer dielectrics significantly decreases due to increased leakage current and dielectric loss under high temperatures and high electric fields. Herein, γ phase Ga2O3 (γ-Ga2O3) nanoplates with wide-bandgap (∼4.7 eV) and moderate dielectric constant (∼10.0) were synthesized and incorporated into a polyimide (PI) matrix. The γ-Ga2O3 nanoplates impede charge injection and transport within the nanocomposites under dual trap mechanisms, namely, deep traps introduced by band alignment at the interface between γ-Ga2O3 and PI and the defective spinel structure of γ-Ga2O3 with lattice defects that function as additional charge carrier traps. Additionally, γ-Ga2O3 nanoplates also serve as electron scattering centers and act as electrical barriers; thus, the leakage current and conduction loss get reduced. Consequently, the nanocomposite with 1 wt % γ-Ga2O3 exhibits a discharge energy density of 4.591 J cm–3 and a breakdown strength (Eb) of 501.49 MV m–1 at 150 °C, which are significantly higher than those of commercial biaxially oriented polypropylene (BOPP) at 25 °C. Moreover, the nanocomposite exhibits remarkable cyclic stability over 120,000 cycles with only 1.2% fluctuation. This work provides a semiconductor filler strategy in the design of polymer nanocomposites for capacitive energy storage at high-temperature and high electric field environments.
研究领域:
材料科学
·
介电材料
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高分子纳米复合材料
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能源存储
·
电子器件
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2015
·
IF 6.025
Xin-Shi Wang,Jun-Qing Situ,Xiao-Ying Ying,Hui Chen,Hua-fei Pan,Yi Jin,Yong-Zhong Du
Multifunctional nanoparticles which integrate the therapeutic agents and bio-imaging agents into one carrier are emerging as a promising therapeutic platform. Herein, GaOOH:Cr 3+ was firstly synthesized using improved hydrothermal method (atmospheric pressure, 95 °C), and by manipulating the pH of the reaction medium, GaOOH:Cr 3+ with different sizes (125.70 nm, 200.60 nm and 313.90 nm) were synthesized. Then β-Ga 2 O 3 :Cr 3+ nanoparticles with porous structures were developed as a result of the calcination of GaOOH:Cr 3+ . The fabricated, porous β-Ga 2 O 3 :Cr 3+ nanoparticles could effectively absorb doxorubicin hydrochloride (DOX) (loading rate: 8% approximately) and had near infrared photoluminescence with a 695 nm emission. Furthermore, β-Ga 2 O 3 :Cr 3+ nanoparticles were coated with l -Cys modified hyaluronic acid (HA-Cys) by exploiting the electrostatic interaction and the cross-link effect of disulfide bond to improve the stability. The DOX loaded HA-Cys coated β-Ga 2 O 3 :Cr 3+ nanoparticles (HA/β-Ga 2 O 3 :Cr 3+ /DOX) showed an oxidation–reduction sensitive drug release behavior. The HA-Cys coated β-Ga 2 O 3 :Cr 3+ nanoparticles showed a low cytotoxicity on MCF-7 and Hela cell lines. The cellular uptake of HA/β-Ga 2 O 3 :Cr 3+ /DOX using the near infrared photoluminescence of β-Ga 2 O 3 :Cr 3+ nanoparticles and the fluorescence of DOX demonstrated the HA/β-Ga 2 O 3 :Cr 3+ /DOX could internalize into tumor cells quickly, which was affected by the size and shape of β-Ga 2 O 3 :Cr 3+ nanoparticles.
研究领域:
材料科学
·
生物医学工程
·
药学
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Junliang Fan,Li Xiao,Yuantao Qin,Hao Yan,Xiaolin Qu,Zhenzhen Li,Hengxiang Gong
There is little research on α-Ga 2 O 3 single crystal film because it is a metastable phase of Ga 2 O 3 crystal and difficult for controllable fabrication. In this paper, highly crystallized Ga 2 O 3 thin films of poly-crystalline, α-Ga 2 O 3 and β-Ga 2 O 3 were prepared by modulating the growth temperature from 400 °C to 700 °C by mist-assisted CVD (Mist CVD) method. The results show that films grown at 525 °C owes the best crystalline quality of α-Ga 2 O 3 film. To further improve the crystallinity of α-Ga 2 O 3 thin film, a systematic simulation revealing the distribution changes of aerosol particle size, flow field, and temperature gradient in the reaction chamber were explored. The optimal growth region C with uniform particle size, well-distribute temperature gradient and stable flow field is determined. Meanwhile, the experimental results of α-Ga 2 O 3 thin films grown at different positions in the reaction chamber was proved to consistent with the simulation results. Furthermore, the optimal single crystallized α-Ga 2 O 3 thin films with smooth surface morphology and optical property were obtained. The PL spectrum operated at room temperature show the α-Ga 2 O 3 film with low defect density and high crystalline quality. It shows that the single crystallized α-Ga 2 O 3 is orientated grown on sapphire substrate with epitaxial relationship of α-Ga 2 O 3 (0006)//c-Al 2 O 3 (0006). Although, slight lattice mismatch is observed on the selected area electron diffraction pattern of the interface between sapphire and α-Ga 2 O 3 film, it is ideal for further application in devices. This work reveals the key point for α-Ga 2 O 3 single crystal film growth by mist CVD is to construct a steady and orderly environment through controlling aerosol particle state.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 28
·3833-3843
·
IF 2.6
Shuting Cui,Yuchao Du,Guoping Li,Qiyong Chen,Ning Tang,Weikun Ge,Lili Xi,Bo Shen,Lijuan Zhao
Gallium oxide (β-Ga2O3) is a well-known extra-wide bandgap semiconductor and one of the promising materials used for power photoelectric devices, gas sensors, catalytic agents, etc. This work presents the suppression of self-trapped holes (STHs) and increase of oxygen vacancies (VO) in β-Ga2O3 microspindles by doping of Zn ions as well as the electrocatalytic activity of these microspindles. Undoped and Zn-doped β-Ga2O3 microspindles were prepared by a hydrothermal method followed by high-temperature calcination. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results show that the morphology and structure of the samples did not change after low dose of Zn doping. The analyses of temperature-dependent photoluminescence (PL) spectra and X-ray photoelectron spectroscopy (XPS) indicate that incorporation of divalent Zn ions as deep acceptors can increase VO concentration and effectively suppress the formation of STHs. Enhanced electrocatalytic activity was observed in Zn-doped β-Ga2O3 microspindles compared with undoped β-Ga2O3 microspindles. The new active sites introduced by Zn doping, higher VO concentration, and suppressed STHs are believed to be responsible for the enhanced electrocatalytic performance of Zn-doped β-Ga2O3 microspindles. This work is expected to expand the application of β-Ga2O3 based microstructures in electrocatalysis and provide innovative ideas for energy and environmental issues.
研究领域:
材料科学
·
电化学
·
半导体物理
·
催化
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Zhiqiang Rao,Yuehan Cao,Zeai Huang,Zihang Yin,Wenchao Wan,Minzhi Ma,Yanxin Wu,Junbu Wang,Guidong Yang,Yi Cui,Zhongmiao Gong,Ying Zhou
Photothermal catalysis, which couples both solar and thermal energies, has burgeoned as a promising approach to drive catalytic reactions. However, the utilization of light irradiation to tune the reaction paths to obtain ideal product distribution in photothermal catalysis is still of tremendous challenge. Herein, we successfully regulated the relationship between two core competition reactions through light irradiation during photothermal dry reforming of methane over Ni/Ga2O3, resulting in the promotion of H2 formation and the suppression of the reverse water gas shift reaction. The increase in the H2/CO ratio from 0.55 to 0.94 could be achieved. Furthermore, the combination of density functional calculations and X-ray photoelectron spectroscopy reveals that light irradiation impelled the direction of electron transfer to be reversed from Ga2O3 to Ni to form the Ni0 sites, which provides the generation of abundant hot electrons from the electronic interband transition of Ni to boost the formation and desorption of H2. This work promotes the understanding of nonthermal behaviors of light irradiation in light-driven photochemistry, which is significant for designing catalysts with high efficiency and controllable product distribution.
研究领域:
化学工程
·
材料科学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）