JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhenbo Du,Yuan Xu,Yu Jing,Ruoshui Li,Jianming Lin,Jihuai Wu,Zhang Lan
All-inorganic carbon-based CsPbIBr 2 perovskite solar cells (PSCs) have attracted attention due to their more balanced performance and stability. The performance of the PSCs is highly dependent on the quality of the absorber films. Unfortunately, most high-performance films are prepared in a glove box and conventional preparation methods often produce perovskite films within 400 nm of thickness, which is detrimental to large area device fabrication and limits their commercial application. Here we had demonstrated a short chain ligands nano-CsPbIBr 2 particles modified hot-casting method to deposit a perovskite film with thickness up to 800 nm. It was carried out by spin-coating a hot CsPbIBr 2 precursor solution onto nano-CsPbIBr 2 particles film on an electron transport layer (ETL), and then depositing nano-CsPbIBr 2 particles on the precursor film again before annealing. The nano-CsPbIBr 2 particles on the ETL promotes precursor solution crystallization and increased film thickness, and the nano-CsPbIBr 2 particles on the precursor film promoted grain growth and reduced defects due to compositional deviations from stoichiometric ratios. The power conversion efficiency (PCE) of the PSCs fabricated by this method is up to 10.66 %. The unencapsulated PSCs still retain more than 85 % of the initial PCE when stored at ambient atmosphere (RH 50–60 %) for 10 days.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Xiaorong Zhang,Xiaochuan Wang,Ping Fu,Wenzhong Lu
YAG ceramics with good dielectric properties were prepared via a modified pyrolysis method, with yttrium nitrate as the yttrium source and combined aluminium sulphate and aluminium nitrate as aluminium sources, and subsequent sintering in a muffle furnace. The effects of the different aluminium sources on the powder characteristic and the impact of sintering temperature , sintering aids (TEOS) and additive (TiO 2 ) on the dielectric properties of the ceramics were studied. The results show that well-dispersed pure YAG nano-powders can be obtained after calcination at 1000 °C with an aluminium sulphate and aluminium nitrate molar ratio of 1.5:2. The relative density, permittivity ( ε r ) and quality factor ( Q × f ) of the YAG ceramics increase with sintering temperature and TEOS addition. TiO 2 can greatly promote τ f to near-zero but decreases Q × f . The relative density, ε r , Q × f and τ f of the YAG–1 wt% TEOS–1 wt% TiO 2 ceramic obtained at 1520 °C are 97.6%, 9.9, 71, 738 GHz and −30 ppm/°C, respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yonghui Yang,Hengwei Yan,Zhanwei Liu,Shenghui Guo,Rui Xia,Jin Zhang
This study develops a two-step electrolysis process using TiO2 as the raw material for large-particle titanium powder production in fluoride-chloride molten salts. TiO2 is first dissolved in NaF-K2TiF6 molten salt at 850 °C to form Ti–O–F complexes, and then titanium is electrodeposited at 1.2 A/cm2 for 4 h to produce sponge-like titanium powder. The obtained titanium powder has an average particle size of approximately 30 μm and an oxygen content of about 0.59 wt %. Due to the high oxygen content, secondary electrorefining is performed in NaCl-KCl melts, investigating the effects of TiCl4 addition, current density, and Ti2+ ion concentration. Under conditions of 0.6 A/cm2 current density and 8 wt % Ti2+ ion concentration with TiCl4 addition, the titanium powder reaches an average particle size of 220 μm, with the oxygen content significantly reduced to 0.021 wt %, and its particle size increases significantly. The oxygen content decreases. The current efficiency during the electrolysis of TiO2 is 54%, while the current efficiency during the secondary electrorefining process is 72%. COMSOL Multiphysics simulation shows good agreement with experimental results, highlighting the influence of current density and titanium ion concentration on cathodic deposition thickness. Compared with the traditional Kroll process, this method reduces energy consumption by approximately 30%, offering a more sustainable and energy-efficient alternative for titanium production. This study confirms the feasibility of using TiO2 in fluoride-based molten salt systems for continuous titanium production.
研究领域:
材料科学
·
冶金工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
Lihua Wang,Yandi Cai,Baochun Liu,Lin Dong
In this report, we present a facile approach for the synthesis of a brown TiO 2 material rich in oxygen vacancies under atmospheric conditions with titanium tetrachloride, oxalic acid and anhydrous ethanol as raw materials. The samples were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance (UV–vis DRS), Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FTIR) and Raman. The visible light photocatalytic activity of the samples was evaluated by degrading of methylene blue solution. XRD and Raman results showed that the brown TiO 2 was anatase TiO 2 . XPS and EPR indicated the presence of abundant oxygen vacancies in the brown TiO 2 . UV–vis DRS illustrated that the brown TiO 2 had a strong absorption in the visible light region. The photocatalytic activity measurement indicated that the visible light photocatalytic performance of the brown TiO 2 was excellent. The surface oxygen vacancies played a key role for the significant enhancement of the brown TiO 2 photocatalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-9
·
IF 2.833
Qin Jianqiang,Zhang Zhenlong,Shi Wenjia,Liu Yuefeng,Gao Huiping,Mao Yanli
Perovskite solar cells (PSCs) have attracted tremendous attentions due to its high performance and rapid efficiency promotion. Compact layer plays a crucial role in transferring electrons and blocking charge recombination between the perovskite layer and fluorine-doped tin oxide (FTO) in PSCs. In this study, compact TiO 2 layers were synthesized by spin-coating method with three different titanium precursors, titanium diisopropoxide bis (acetylacetonate) (c-TTDB), titanium isopropoxide (c-TTIP), and tetrabutyl titanate (c-TBOT), respectively. Compared with the PSCs based on the widely used c-TTDB and c-TTIP, the device based on c-TBOT has significantly enhanced performance, including open-circuit voltage, short-circuit current density, fill factor, and hysteresis. The significant enhancement is ascribed to its excellent morphology, high conductivity and optical properties, fast charge transfer, and large recombination resistance. Thus, a power conversion efficiency (PCE) of 17.03% has been achieved for the solar cells based on c-TBOT.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Zhitao Yuan,Xuan Zhao,Qingyou Meng,Yunhai Zhang,Yuankai Xu,Lixia Li
Sodium citrate was introduced as a depressant for ilmenite flotation, and its effect on the activation of ilmenite and depressing titanaugite was investigated. The flotation results showed that ilmenite was effectively separated from titanaugite as a concentrate with a TiO 2 grade of 43.62% and recovery of 87.42%. The contact angle analysis revealed that sodium citrate further increased the hydrophobicity of ilmenite and decreased it in the case of titanaugite. The zeta potential results indicated that the adsorbed sodium citrate accelerated the adsorption of sodium oleate on the ilmenite surface, but weakened the adsorption on titanaugite. Inductively coupled plasma mass spectrometry (ICP) and solution chemistry analyses illustrated that sodium citrate improved the flotation of ilmenite and depressed the flotation of titanaugite. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis demonstrated that sodium citrate adsorbed onto ilmenite through Fe 3+ and onto titanaugite through the active sites of Ca and Mg.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 35
·14915-14924
·
IF 7.79
Weihai Sun,Jinjun Zou,Xiaobing Wang,Shibo Wang,Yitian Du,Fengxian Cao,Lan Zhang,Jihuai Wu,Peng Gao
Regardless of the impressive progress that perovskite solar cells (PSCs) have achieved, especially considering their power conversion efficiency (PCE) over 25%, traditional PSCs still contend with an inherent instability with exposure to humidity, which remains as a critical issue for the realization of commercial production. Herein, we proposed an effective pathway to relieve the instability of PSCs without sacrificing efficiency by introducing a 2D phase at the surface of the 3D perovskite film, based on a novel organic cyclohexylmethylammonium iodide (CMAI). The self-assembled thin 2D capping layer atop the 3D perovskite layer can not only reduce the ionic defects, but also serve as a protective barrier against moisture. Consequently, the champion device incorporating 2D perovskite capping layers delivered an open-circuit voltage (Voc) of 1.19 V, which contributes to an impressive PCE of 22.06% on account of the improved charge extraction and decreased non-radiative recombination. More importantly, an excellent long-term stability along with mitigated hysteresis was observed for the modified devices as a result of the suppressed ion migration and high humidity resistance of the 2D perovskite film. Our finding provides a comprehensive approach for simultaneously enhancing the efficiency and stability of PSCs through dimension engineering utilizing CMA-based 2D perovskite materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 9
·1216-1225
·
IF 1.713
Wei Wang,Yue Hong-rui,Xue Xiang-xin
This study investigated the interdiffusion of calcium ferrite/calcium titanate system in the time range of 0–120 min by the diffusion couple method in a CO/N 2 reducing atmosphere at 700°C. The results show that after the diffusion reaction occurred, no longitudinal agglomerations were present on the substrate surface on the calcium titanate side. When the diffusion time was increased to 105 min, a net vacancy flow from calcium titanate to calcium ferrite might have occurred, causing the surface of the calcium ferrite substrate to collapse. The thickness of the diffusion layer of the calcium ferrite/calcium titanate system was about 17–48 µm, which conforms to the parabolic law of diffusion. The diffusion coefficient and the Ti 4+ concentration in the calcium ferrite/calcium titanate system are related. This shows an increase in the diffusion coefficient with the increase of Ti 4+ concentration, and the diffusion coefficient value was in the range of 10 −12 –10 −11 cm 2 ·s −1 .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-19
·
IF 12.264
Huang Linsheng,Zhou Xiaowen,Xue Rui,Xu Pengfei,Wang Siliang,Xu Chao,Zeng Wei,Xiong Yi,Sang Hongqian,Liang Dong
Nanoscale multi-dimensional heterojunctions in situ grow at the edge of two-dimensional MXene conductive network.
A controlled anneal procedure in 150 °C is for preparing anatase TiO 2 /SnO 2 heterojunctions with oxygen vacancy scramble effect.
The perovskite solar cells achieve high power conversion efficiency and high moisture-resistance stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhenqi Cui,Jia Yao,Tao Mei,Shiyuan Zhou,Baofei Hou,Jing Li,Jinhua Li,Jianying Wang,Jingwen Qian,Xianbao Wang
In our study, TiC-TiO 2 /S composite was successfully prepared with a simple and effective method. For this special micro-mesoporous structure, TiC-TiO 2 can be used as an efficient sulfur storing material, and also restrain the volume expansion of sulfur to a certain degree for its suitable specific surface area. TiO 2 and TiC can suppress the diffusion of polysulfides due to their strong interaction with polysulfides . At the same time, TiC also can remedy the nonconductive defect of sulfur for its good conductivity. With the help of above advantages, the TiC-TiO 2 /S cathode delivers an initial discharge specific capacity of 1218 mAh g −1 at 1 C (1 C = 1675 mA g −1 ) with the sulfur loading of 1.5 mg cm −2 . And when cycles at 0.5 C, a stable capacity of 714 mAh g −1 can be maintained after 500 cycles accompanied with the sulfur loading of 1.1 mg cm −2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Baogang Ding,Yunpeng Qu,Kai Sun,Runhua Fan
Epsilon-negative ( ? ′ < 0) and epsilon-near-zero (ENZ) property was demonstrated in titanium carbide/copper calcium titanate (TiC/CCTO) metacomposites. Benefiting from the moderate concentration of free electrons in TiC filler and its adjustable three-dimensional (3D) networks, weakly negative permittivity ( ∼ − 200 at 20 MHz) was achieved. Not only that, tailoring the negative permittivity of metacomposites from ∼ − 200 to ∼ − 2060, ∼ − 4200, ∼ − 14000 and ∼ − 70000 at 20 MHz was realized by simply increasing TiC content. Besides, Drude model was used to explain the radio-frequency (RF) negative permittivity and quantified the collective plasma oscillation in TiC networks.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Mingxuan Sun,Xiaojing Lin,Xianglong Meng,Wenzhu Liu,Zhipeng Ding
Herein, a series of TiO 2 /Bi 0.5 Na 0.5 TiO 3 heterojunctions with different mass ratio are first constructed under ultrasound irradiation, which shows superior sonocatalytic and photoelectrochemical properties. The improved performance is attributed to the internal electric field and close interfacial contact of TiO 2 and Bi 0.5 Na 0.5 TiO 3 , which promote the transfer of photoinduced electrons from TiO 2 to Bi 0.5 Na 0.5 TiO 3 . The spontaneous polarization of ferroelectrics in the heterostructures can be adjusted by ultrasonic treatment durations, which further influences the internal electric field. The TiO 2 /Bi 0.5 Na 0.5 TiO 3 sample with mass ratios of 5:1 and ultrasonic treatment for 15 min presents the highest sonocatalytic degradation of Rhodamine B. Moreover, the sonocatalytic activity also shows a close relevant to the ultrasonic temperature and frequency of degradation process. And, the •OH radicals are mainly responsible for Rhodamine B sonodegradation. This work provides a novel TiO 2 /Bi 0.5 Na 0.5 TiO 3 heterojunctions and promotes the application of ferroelectrics modified materials in sono-/photo-catalysis.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）