CHEMICAL ENGINEERING SCIENCE
·
2024
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IF 4.1
Wei Lei,Yu-gao Wang,Wei-jia Jiang,Jian-xin Liu,Mohannad Mayyas,Jun Shen,Xian-yong Wei
Quantum dots exhibit unique photoconversion properties, making them attractive candidates for enhancing photocatalytic reactions. Nonetheless, it is rarely reported that sulfur quantum dot (SQD) sensitized TiO 2 . Furthermore, the lack of efficient synthetic approaches for high-throughput production of SQD remains a challenge in practical applications. Here, the sublimated sulfur powder was applied to achieve rapid and efficient synthesis of SQD by a two-step oxidation procedure. The method could avoid dialysis and freeze-drying processes while achieving a remarkable mass yield of up to 25% based on sulfur content. Product characterization suggested that the sulfonyl groups of SQD assisted in the attachment of SQD on TiO 2 surface to form SQD-TiO 2 .The performance of SQD-TiO 2 for degrading methyl orange in contaminated wastewater was assessed under simulated sunlight. The photocatalytic performance of SQD-TiO 2 was significantly higher than that of pristine TiO 2 , suggesting excellent simulated sunlight photoconversion synergy between titanium dioxide as a photocatalyst and SQD as photosensitizers. The successful integration of SQD onto TiO 2 would expend the effective utilization approaches of SQD in the field of photosensitizer.
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DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2024
·
IF 2.4
Chen Mao,Chen Buxin,Jiang Yang,Zheng Kui,Hu Meilong,Qiu Shuxing
Ti(C,N) is commonly observed in vanadium titanomagnetite blast furnaces and greatly affects the stable and smooth operation of the smelting processes. To get fundamental insight into Ti(C, N) formation, systematic experiments were conducted to investigate the effects of the composition of slags, temperatures, reaction time and reaction atmosphere on the formation of Ti(C,N) from TiO 2 -containing slags. The results show that TiN and TiC contents increase with TiO 2 content increases. When TiO 2 is larger than 30 wt pct, TiN contents increase dramatically. Control of basicity, MgO and Al 2 O 3 concentrations in the slag could help to reduce Ti(C,N) contents in slags. TiN and Ti(C,N) contents increase dramatically with the extension of time. TiN is more easily formed at high temperatures, and TiN contents increase with the increase of temperature. With the increase of N 2 contents, TiC contents are relatively stable, and TiN and Ti(C,N) contents increase almost linearly. H 2 would greatly promote the formation of TiC. This paper can provide a theoretical basis for minimizing the formation of Ti(C,N) in different blast furnace conditions.
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DOI
高影响因子
APPLIED ENERGY
·
2021
·
IF 9.746
Chao Wang,Mingzheng Liao,Bo Liang,Zhiqiang Jiang,Weilin Zhong,Ying Chen,Xianglong Luo,Riyang Shu,Zhipeng Tian,Libin Lei
Utilization of propane in solid oxide fuel cells (SOFCs) is desired for commercial applications. However, the susceptibility of conventional Ni-based anode to coking is still a technical challenge. Developing an efficient catalyst for hydrogen production through partial oxidation of propane is a feasible approach to address this issue. In fact, hydrogen production from propane partial oxidation is profoundly determined by catalyst performance, which further affects the fuel cell efficiency. In this study, a robust and efficient catalyst is developed by incorporating inexpensive TiO 2 into Ni-Co/Al 2 O 3 catalyst. The results suggested that an appropriate amount of TiO 2 in catalyst support could regulate the interaction between active metal and Al 2 O 3 support therefore inhibiting catalyst carbon deposition and sintering. Also, TiO 2 addition is conducive to the catalyst regeneration process by reducing the activation energy of oxidative decarburization. Hydrogen yield was efficiently promoted by the synthesized catalyst. Consequently, under the equivalent hydrogen (160 ml/min) produced over the catalyst, the SOFCs, with a cathode area of 15 cm 2 , display impressive performance (maximum power density, 404 mW/cm 2 ) and excellent stability. Through cost-benefit analysis, the application of the synthesized catalyst is considered for great advantages in capital and energy saving. Ultimately, this work might offer a novel point of view for developing a low-cost, robust and efficient catalyst towards indirect hydrogen production for SOFCs.
研究领域:
能源科学
·
催化化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Jiewei Chen,Gaoxiang Wu,Tianyue Wang,Xiaodan Li,Meicheng Li,Yuanhua Sang,Hong Liu
Semiconductor photocatalysts have been widely used for solar-to-hydrogen conversion; however, efficient photocatalytic hydrogen generation still remains a challenge. To improve the photocatalytic activity, the critical step is the transport of photogenerated carriers from bulk to surface. Here, we report the carrier step-by-step transport (CST) for semiconductor photocatalysts through precise defect engineering. In CST, carriers can fast transport from bulk to shallow traps in the defective subsurface first, and then transfer to the surface active acceptors. The key challenge of initiating CST lies in fine controlling defect distribution in semiconductor photocatalysts to introduce the special band matching between the crystalline bulk and defect-controllable surface, moderate bridgelike shallow traps induced by subsurface defects, and abundant surface active sites induced by surface defects. In our proof-of-concept demonstration, the CST was introduced into typical semiconductor TiO2 assisted by the fluorine-assisted kinetic hydrolysis method, and the designed TiO2 can exhibit the state-of-the-art photocatalytic hydrogen generation rate among anatase TiO2 up to 13.21 mmol h–1 g–1, which is 120 times enhanced compared with crystalline anatase TiO2 under sunlight. The CST initiated by precise defect distribution engineering provides a new sight on greatly improving photocatalytic hydrogen generation performance of semiconductor catalysts.
研究领域:
材料科学
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能源化学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2024
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IF 6.5
Lei Wu,Ruiting Xue,Yang Li,Shaobo Cao,Jian yang,Ximei Fan
Metal/semiconductor heterostructures have been widely used to drive photochemical reactions. However, understanding of the synergies between them is still limited. In this study, we discovered that under ultraviolet (UV) light, rather than visible (Vis) excitation, the redox active sites oxidize adsorbed water and reduce oxygen molecules more efficiently. In this paper, the comprehensive mechanism of Ag@TiO 2 photocatalysis of H 2 O 2 has been elucidated and confirmed their synergies in photocatalytic reactions, through in situ characterization and theoretical calculation. Our findings provide insights into the key factors that influence the difference of photoactivity in UV and Vis light, thus having important implications for the design of solar energy conversion materials as well as environmental purification materials.
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2016
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IF 7.354
Lin Li,Rong Chen,Xun Zhu,Qiang Liao,Hong Wang,Liang An,Muxing Zhang
In this work, a novel photoanode with a cascading gradient pore microstructure is proposed to enhance photoelectrochemical and photocatalytic activities, which consists of a nanocrystalline TiO 2 layer synthesized by the sol–gel method, a microporous layer, and a macroporous layer formed by adding PEG and PMMA as the template, respectively. The gradient pore microstructure can not only enhance the mass and photon transfer and improve the light utilization, but also increase the electrical conductivity and restrain the recombination of photoexcited electron–hole pairs. Furthermore, the cascading design helps to establish tighter interparticle connections between layers. Because of these merits, it has been found that the cascading gradient pore microstructured photoanode exhibited a 63% improvement over the conventional photoanode in terms of photoelectrochemical activity. This new design also enhanced the photocatalytic activity, leading to a much higher methylene blue degradation efficiency (76.7%) than that of conventional photoanodes (62.5%). The effect of the PMMA/TiO 2 ratio on the structure and performance of the proposed photoanode was also investigated. The highest performance was achieved with a PMMA/TiO 2 ratio of 1:1. The obtained results establish a new avenue for designing the photoanodes of photoelectrochemical systems.
研究领域:
材料科学
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能源科学
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环境科学
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DOI
高影响因子
Journal of Advanced Ceramics
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2018
·Vol. 7
·期 2
·152-159
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IF 1.605
Wu Jia-Min,Xiao Huan,Liu Meng-Yue,Chen Ying,Ma Yi-Xin,Cheng Li-Jin,Shi Yu-Sheng
In this paper, in-situ coagulation of 0.9Al 2 O 3 –0.1TiO 2 suspension and microwave dielectric properties of 0.9Al 2 O 3 –0.1TiO 2 ceramics prepared by a novel direct coagulation casting via high valence counter ions (DCC-HVCI) method were proposed. The 0.9Al 2 O 3 –0.1TiO 2 suspension could be coagulated via controlled release of calcium ions from calcium iodate at an elevated temperature. The influence of tri-ammonium citrate (TAC) content, solid loading, and calcium iodate content on the rheological properties of the suspension was investigated. In addition, the influence of coagulation temperature on coagulation time and properties of green bodies was also studied. It was found that the stable 0.9Al 2 O 3 –0.1TiO 2 suspension could be successfully prepared by adding 0.3 wt% TAC and adjusting pH value to 10–12 at room temperature. 0.9Al 2 O 3 –0.1TiO 2 green bodies with uniform microstructures were coagulated by adding 8.0 g/L calcium iodate after treating at 70 °C for 1 h. 0.9Al 2 O 3 –0.1TiO 2 ceramics, sintered at 1500 for 4 h and annealed at 1100°C for 5 h, showed °Cuniform microstructures with density of 3.62±0.02 g/cm 3 . The microwave dielectric properties of 0.9Al 2 O 3 –0.1TiO 2 ceramics prepared by DCC-HVCI method were: ε r = 11.26±0.06, Q × f = 11569±629 GHz, τ
f
= 0.93±0.60 ppm/°C. The DCC-HVCI method is a novel and promising route without binder removal process to prepare complex-shaped microwave dielectric ceramics with uniform microstructures and good microwave dielectric properties.
研究领域:
材料科学
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陶瓷学
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DOI
高影响因子
SOLAR ENERGY
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2020
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IF 4.608
Deye Liu,Kunpeng Liu,Yueying Liu,Jihao Bai,Meng Dai,Fengmin Liu,Geyu Lu
A uniform CH 3 NH 3 PbI 3 layer was successfully deposited on a mesoporous TiO 2 layer (mp-TiO 2 ) via a two-step low-voltage room-temperature electrochemical deposition method without annealing. The deposited perovskite crystals were applied to cover a surface mp-TiO 2 electron transport material and fill the nanoscale blank of mp-TiO 2 . A mesoporous electron transport material and a platinum sheet were used as working and counter electrodes, respectively. The obtained film was then utilized to fabricate a mesoporous hybrid perovskite solar cell (PSC) with the configuration of a fluorine-doped tin oxide/compact TiO 2 /mp-TiO 2 /perovskite/Spiro-OMeTAD/Au electrode. An efficiency of 15% was achieved by adjusting Pb and MAI deposition and by using champion cells with an active area of 2 mm × 2 mm at 1 sun under an AM 1.5 condition. The perovskite layers and PSCs were analyzed through several characterization methods. Results demonstrated that this deposition technology could be applied to easily control the morphological characteristics of perovskite layers. Thus, a high power conversion efficiency was obtained. This study proposed a possible perovskite deposition process and demonstrated that electrochemical deposition could have potential for application in PSC fabrication.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
MATERIALS SCIENCE FORUM
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2020
·
IF 0
Nian Liang Gu,Jian Rong Wang,Cai Xia Chu,Juan Chen,Ke Li
In this paper, the effect of simulated seawater on properties of corn straw fibers (CSF) reinforced polypropylene composites was studied. Firstly, CSF was modified with nano-TiO2 particles, and then the modified CSF reinforced polypropylene (PP) composite was prepared. The flexural property and the microstructure of the composites before and after soaking simulated seawater for 21 days were investigated. The results showed that the simulated seawater in short-term immersion could play a role in plasticizing interface and improve the flexural property of CSF/PP composite. After 21 days of simulated seawater immersion, the flexural strength of CS/PP was increased by 18.00%. The modification of TiO2-CSF could improve the flexural property of CSF/PP composite. When the addition of TiO2 was 4 wt.%, the flexural strength reached 44.91 MPa, increased by 17.54% compared with that of unmodified composite.
研究领域:
材料科学
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环境工程
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DOI
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Shipeng Zhang,Rong Wang,Jinhua Zhu,Xiaoyan Xie,Mei Luo,Hailong Peng,Yude Liu,Fei Feng,Ronghui Shi,Wang Yin
Designing environmentally friendly, low cost and efficient photocatalysts is vitally important for degradation of organic pollutants . Herein, a ternary composite-ZnO/ACSC@TiO 2 , constituted by activated coconut shell derived biochar (ACSC), TiO 2 and ZnO, was successfully synthesized by two-step hydrothermal method . It demonstrated that TiO 2 could be uniformly wrapped on ACSC surface during first step to form core-shell structures (ACSC@TiO 2 ). It was beneficial not only to enhance adsorption capacity for organic pollutants and absorption ability for light, but also to form C-doped TiO 2 with a relatively narrow bandgap to expand light absorption of TiO 2 from UV to visible light. Subsequently, ZnO was introduced through second step to generate type-II heterojunctions with ACSC@TiO 2 , which further reduced bandgap value of the ternary photocatalyst to promote photogenerated carrier generation and efficiently diminished recombination of e - -h + pairs. As expected, the optimal prepared catalyst with 10 wt% of ZnO (10%ZnO/ACSC@TiO 2 ) exhibited excellent adsorptive and photocatalytic abilities for removal of tetracycline (TC) and Rhodamine B (RhB) with different initial concentrations. Particularly, its total removal efficiency for TC and RhB was 97.6% and 99.4%, respectively under 300 W xenon lamp irradiation (25 mg/L of organic pollutants, 1.0 g/L catalyst and natural pH in 60 min). Investigations on catalytic mechanism and degradation pathways proved that 10%ZnO/ACSC@TiO 2 could remove RhB and TC by deep degradation. Its enhanced synergy of adsorption and photocatalysis could efficiently accelerate mineralization rates of RhB and TC. This biomass derived biochar-based ternary composite as photocatalyst with optimized energy band structures and microstructures would have good industrial application potential.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Linfeng Li,Yaoqi Huang,Yuanyuan Li,Xiaomin Cheng
The regulation of the thermal conductivity of thermal energy storage materials has become a primary challenge to expand the range of utilization for different application scenarios. In this study, organic-shell microcapsule (paraffin@melamine formaldehyde) was initially prepared by in situ polymerization, followed by the deposition of anatase TiO 2 on the organic-shell microcapsule using atomic layer deposition (ALD) to form organic-inorganic double-shell microcapsule. The effect of the thickness of the TiO 2 shell on the equivalent thermal conductivity of the microcapsules was investigated by utilizing ALD's precise and controllable characteristics for the coating thickness. The obtained double-shell microcapsules indicated a drop in thermal storage capacity, but a substantial boost in thermal stability. Moreover, the thermal conductivity of microcapsules can be tuned in the range between 0.1837 and 0.7529 W m −1 K −1 within 1500 ALD cycle treatment. Furthermore, the parameters of ALD, such as reaction temperature and exposure time, were varied to obtain an amorphous TiO 2 shell, and the impacts of different crystal form of TiO 2 on the heat transfer properties of microcapsules were concluded by comparison. Double-shell microcapsules exhibited superior mechanical properties compared to single-shell structure. The findings can stimulate significant research interest in broadening the applications of thermal storage microcapsules.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Bo Jiang,Jun Bai,Lin Li,Nan He,Qian Zhang,Bingsen Wang,Dawei Tang
The photocatalytic fuel cell (PFC) is a promising energy conversion technology for effective solar energy utilization, wastewater treatment , and electricity generation by photoelectrochemical reactions. Nevertheless, the discharging current output and stability of the PFC are still plagued by the low photoelectron conversion efficiency and time-varying light intensity , respectively. Herein, we integrated a RuO 2 capacitive layer and a TiO 2 photocatalytic layer into a capacitive photoanode, finally designing a PFC with the capacitive photoanode. Not only can the successful integration of the capacitive layer augment the discharging current, but it can also balance the solar intensity fluctuation by the ability of electron storage. The capacitive photoanode showed a high areal capacitance of 1040.7 mFcm −2 at a current density of 0.5 mAcm −2 , was continuously charged and discharged for 1000 cycles, and maintained 87 % of the original capacitance after cycles. The superior rate capability, high capacitance, and good cycle performance of the capacitive photoanode originate from the “crack mud” structure in the capacitive layer. The discharging current of the capacitive photoanode was 32.0 mAcm −2 under one sun illumination, and the electrochemical performance of the capacitive photoanode was better than that of the conventional TiO 2 photoanode. The capacitive photoanode PFC possessed a maximum short-circuit current of 300.0 μA ⋅ cm −2 at the beginning of discharge, which is independent of the light intensity. The capacitive photoanode PFC adopts a new working mode and provides a unique solution for the practical application of PFC.
研究领域:
能源科学
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环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）