Crystals
·
2021
·Vol. 11
·期 11
·1287
·
IF 2.589
Yue Han,Rong Wen,Feng Zhang,Linlin Shi,Wenyan Wang,Ting Ji,Guohui Li,Yuying Hao,Lin Feng,Yanxia Cui
High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Pan Lun,Ai Minhua,Huang Chenyu,Yin Li,Liu Xiang,Zhang Rongrong,Wang Songbo,Jiang Zheng,Zhang Xiangwen,Zou Ji-Jun,Mi Wenbo
Photocatalysis has been regarded as a promising strategy for hydrogen production and high-value-added chemicals synthesis, in which the activity of photocatalyst depends significantly on their electronic structures, however the effect of electron spin polarization has been rarely considered. Here we report a controllable method to manipulate its electron spin polarization by tuning the concentration of Ti vacancies. The characterizations confirm the emergence of spatial spin polarization among Ti-defected TiO 2 , which promotes the efficiency of charge separation and surface reaction via the parallel alignment of electron spin orientation. Specifically, Ti 0.936 O 2 , possessing intensive spin polarization, performs 20-fold increased photocatalytic hydrogen evolution and 8-fold increased phenol photodegradation rates, compared with stoichiometric TiO 2 . Notably, we further observed the positive effect of external magnetic fields on photocatalytic activity of spin-polarized TiO 2 , attributed to the enhanced electron-spin parallel alignment. This work may create the opportunity for tailoring the spin-dependent electronic structures in metal oxides.
研究领域:
材料科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Congyu Qin,Shuchen Xing,Guiming Ba,Huilin Hu,Jinhua Ye,Defa Wang
Photothermocatalytic carbon dioxide (CO2) reduction into value-added chemicals is one of the promising methods for solar-to-chemical energy conversion. However, it remains a challenge in the improvement of catalytic activity and product selectivity in view of practical applications. Herein, we report a facile “two-step” approach – nitrogen treatment of Ti3C2 MXene (TC) and loading of Co nanoparticles – to synthesize a Co-nanoparticle/layered TiO2-TiN (Co/TiO2-TiN) composite as an efficient photothermocatalyst for selective reduction of CO2 to methane (CH4). In contrast to the Co/Ti3C2 catalyst that shows a high CO selectivity, the optimal 35Co/TiO2-TiN catalyst exhibits a CH4 evolution rate of 45.5 mmol gcat−1 h−1 with 99.3 % selectivity under a 300 W Xe lamp irradiation. The synergistic effect of increased light absorption capacity, reactive sites, CO2 adsorption/activation ability, and desorption energy barrier of CO* intermediate by the loaded Co nanoparticles and the formation of Ti−N−O bonds accounts for the significantly enhanced photothermocatalytic performance of 35Co/TiO2-TiN for selective CO2 reduction into CH4. Our work demonstrates that metal nanoparticle loading and formation of Ti−N−O bonds can be integrated into the strategy in developing a photothermocatalyst for efficient CO2 reduction with controlled product selectivity.
研究领域:
催化
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材料科学
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环境科学
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能量转换
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纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junchuan Zhang,Yuan Yan,Andac Armutlulu,Kexin Wei,Jian Wu,Bo Lai,Ruzhen Xie
Heterojunctions present a promising avenue for improving charge separation in photocatalytic water purification processes. However, the multicomponent heterojunction interfaces often act as recombination centers for photogenerated carriers. Herein, a Ti-based homologous-like heterojunction was fabricated by in-situ growth of controllable CaTiO 3 on sulfur-doped TiO 2 (STCTO). This heterojunction exhibits outstanding performance in photocatalytic water decontamination when assisted by peroxymonosulfate (PMS). The well-matched interfaces within the heterojunction generate internal electric fields that facilitate efficient electron migration from ST to CTO by minimizing the energy barrier. PMS serves as a dual function as an electron-acceptor to enhance carriers separation efficiency, and as a precursor for sulfate radical generation, thereby promoting the production of reactive species. Consequently, the homologous-like heterojunction STCTO enables complete Atrazine removal without any deterioration even after 8th recycle. These findings underscore the synergistic effects of photo-energized and PMS-intensified homologous heterojunctions, providing insights into a novel approach for the removal of refractory hazardous organic contaminants using solar energy.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2024
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IF 2.4
Chen Mao,Dong Xiaosen,Pu Shuiqiang,Tang Wenbo,Zheng Kui
Na 2 O and K 2 O alkaline oxide capacities of TiO 2 -bearing blast furnace slags are critical values for vanadium titanomagnetite blast furnace operation. In this study, high-temperature experiments with fast-quenching were conducted to investigate the effects of TiO 2 concentration, basicity, MgO and Al 2 O 3 concentrations on Na 2 O and K 2 O concentrations in the TiO 2 -bearing blast furnace slags. The results were correlated with optical basicity and also compared with the plant data from one commercial vanadium titanomagnetite blast furnace.
研究领域:
冶金工程
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 21
·6754-6759
·
IF 7.393
Ziyu Yang,Jun-Yi Ge,Shuangchen Ruan,Hongzhi Cui,Yu-Jia Zeng
Herein, we report on the magnetic and magnetocaloric properties of a distorted double-perovskite, Gd2ZnTiO6, through static magnetization and heat capacity measurements, and mean-field analysis. The most pronounced isothermal magnetic entropy change −ΔSM, and relative cooling power RCP are found to be 53.5 J K−1 kg−1 and 620.6 J kg−1, respectively, under a field change of 9 T at 3.1 K with a large adiabatic temperature change Tad of 23.7 K, far exceeding the commercial cryo-coolant Gd3Ga5O12 (GGG). The results suggest that Gd2ZnTiO6 is a potential working refrigerant material for the targeted liquefaction of helium.
研究领域:
材料科学
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低温物理学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
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IF 11.2
Xiaotu Yang,Zihao Yue,Ruixiang Deng,Zhengliang Zhang,Tao Zhang,Lixin Song
Stability hinders further development of all-inorganic CsPb X 3 ( X = Cl, Br, I) quantum dots (QDs) although they exhibit promising prospects in optoelectronic applications. Coating perovskite quantum dots (PQDs) with a glass network to form QD glass can significantly improve their stability. However, the dense glass network degrades their luminescent performance. In this work, the crystallization behavior of PQDs in glass and better luminescence properties are prompted by introducing titanium dioxide into borosilicate glass. The luminescence intensity of TiO 2 -doped CsPbBr 3 QD glass is increased by 1.6 times and the PLQY is increased from 49.8 % to 79 % compared to the undoped glass. Evidence proves that the improved properties are attributed to the enhanced nucleation effect of titanium dioxide during the annealing process. Benefiting from the densification of the glass network caused by titanium dioxide doping, the stability of the PQD glass is further improved. LED devices with an ultra-wide color gamut that fully covers the NTSC1953 standard and achieves 128.6 % of the NTSC1953 standard as well as 91.1 % of the Rec.2020 standard were fabricated by coupling PQD glass powder, demonstrating promising commercial applications of PQD glass in optoelectronic displays.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2021
·
IF 4.527
Yufei Tang,Xuan Zhou,Qi Zhang,Lei Chen,Kang Zhao,Zixiang Wu
Directional lamellar porous titanium scaffolds are widely used as bone implant bearing materials because of their anisotropic pore structure . Their mechanical properties can be effectively improved by enhancing the strength of pore walls through the introduction of ceramics. In this work, porous titanium implants were prepared by freeze casting combined with TiH 2 decomposition. The graphene was introduced into the pore walls of porous titanium, which could transform into titanium carbide (TiC) in situ upon sintering. TiC was evenly distributed in the lamellar pore walls, and the interface was well bonded. The compression strength of the fabricated implants was up to 389.94 MPa when the graphene content was 3 wt%, which was 377.8% times as high as the porous titanium. The crack propagation was resisted by TiC because of the “pinning” effect on the pore wall. Some of TiC were pulled out from the matrix, and others were fractured. The strength of the fabricated implants was improved significantly by the large consumption of fracture energy. Also, fabricated porous titanium implants with TiC are suitable for bone implantation.
研究领域:
生物材料学
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医学工程
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
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2021
·
IF 4.765
Qingyou Meng,Yuankai Xu,Zhitao Yuan,Xuan Zhao,Yusheng Du
The mixed BHA/NaOL surfactant was proposed as a flotation collector for the separation of ilmenite from titanaugite. Both experimental and computational studies were applied to reveal the interaction mechanism between minerals and mixed BHA/NaOL collector. Microflotation tests showed that the floatability of ilmenite was higher than titanaugite with mixed BHA/NaOL collector. The experiment of artificially mixed minerals achieved an excellent indicator with 86.50% of recovery and 39.42% of TiO 2 grade. The results of zeta potential, AFM and XPS analyses indicated that the mixed BHA/NaOL interacted with Fe and Pb active sites and co-adsorbed onto the ilmenite surface, but only physical adsorption on the titanaugite surface. Simulation results evidenced that BHA/NaOL collectors could substitute water molecules on ilmenite surface rather than titanaugite and form a stable hydrophobic layer on the ilmenite surface. These observations contributed to enlarging the floatability difference between ilmenite and titanaugite.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
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IF 4.484
Jinfeng Lei,Meizhou Zhang,Shen Wang,Lei Deng,Defu Li,Changdao Mu
Water contamination is one of the most serious problems today. Titanium dioxide (TiO2) has received increasing attention on water decontamination. It will be a great contribution to fabricate water-soluble anatase TiO2 nanoparticles with efficient visible light photocatalytic activity for water decontamination. Herein, we present a simple one-pot approach to synthesize a water-soluble anatase TiO2 nanoparticle cluster with efficient visible light photocatalytic activity. PEG400 was used as a stabilizer to improve the aqueous dissolubility, while HCl was used to control the anatase phase of TiO2. In particular, titanium tetrachloride (TiCl4) and titanium butoxide were cooperatively served as precursors of titanium. The results indicated that the crystals of TiO2 were stacked together to form big crystal clusters cooperatively using TiCl4 and titanium butoxide as precursors of titanium. The TiO2 crystal cluster presented good aqueous dissolubility, and the anatase phase was successfully controlled. It is interesting that the UV–vis absorbance of aqueous solution of the TiO2 crystal cluster was highly enhanced and expanded into the visible region. The TiO2 crystal cluster possessed efficient photocatalytic activities both under UV and visible light irradiation. The water-soluble TiO2 clusters have application prospect in water decontamination.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 10
·2738
·
IF 5.076
Jinsong Qi,Shixun Wang,Arsenii Portniagin,Stephen V. Kershaw,Andrey L. Rogach
Lead-free two-dimensional metal halide perovskites have recently emerged as promising light-emitting materials due to their improved stability and attractive optical properties. Herein, a facile room temperature wet milling method has been developed to make Dion–Jacobson (DJ) phase ODASnBr4perovskite microcrystals, whose crystallization was accomplished via the aid of introduced primary alcohols: ethanol, butanol, pentanol, and hexanol. Due to the strong intermolecular hydrogen bonding, the use of ethanol promoted the formation of non-doped ODASnBr4microcrystals, with an emission peaked at 599 nm and a high photoluminescence quantum yield (PL QY) of 81%. By introducing other primary alcohols with weaker intermolecular hydrogen bonding such as butanol, pentanol, and hexanol, [SnBr6]4−octahedral slabs of the DJ perovskite microcrystals experienced various degrees of expansion while forming O–H…Br hydrogen bonds. This resulted in the emission spectra of these alcohol-doped microcrystals to be adjusted in the range from 572 to 601 nm, while keeping the PL QY high, at around 89%. Our synthetic strategy provides a viable pathway towards strongly emitting lead-free DJ perovskite microcrystals with an improved stability.Keywords:Dion–Jacobson perovskites;tin bromide perovskites;photoluminescence;crystallization;primary alcohols
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
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IF 5.383
Hainan Sun,Juan He,Zhiwei Hu,Chien-Te Chen,Wei Zhou,Zongping Shao
The oxygen evolution reaction (OER) plays a crucial role in the application of water splitting, which is a highly competitive option for a sustainable energy future. Thus, it is vital to design highly active and durable electrocatalyst for OER. Herein a hybrid with the nominal composition of Ba 2 Co 1.5 Mo 0.25 Nb 0.25 O 6-δ (denoted as BC1.5 MN) electrocatalyst consisting of both double perovskite and single perovskite structures is synthesized by a solid-state reaction method. When tested as an electrocatalyst for OER, the BC1.5 MN electrocatalyst requires a current density of 10 mA cm −2 at an overpotential of 400 mV, an onset overpotential of 260 mV, and a Tafel slope of 70 mV dec −1 , which are superior to that of precious metal oxide IrO 2 catalyst. Chronoamperometric and cyclic voltammetry studies demonstrate that the BC1.5 MN electrocatalyst has outstanding durability in alkaline solution. The synergistic effect between multi-active sites derived from a single/double perovskite hybrid structure results in one of the most active perovskite-based OER electrocatalysts in alkaline solution.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
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