JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xing Du,Xuan He,Lei Zhao,Hui Chen,Weixin Li,Wei Fang,Wanqiu Zhang,Junjie Wang,Huan Chen
It reported a novel and simple method for the first time to prepare TiO 2 hierarchical porous film (THPF) using ultrastable foams as a soft template to construct porous structures . Moreover, dodecanol as one foam component was creatively used as solvent during the synthesis of CdSe quantum dots (QDs) to decrease reaction temperature and simplify precipitation process. The result showed that hierarchical pores in scale of microns introduced by foams were regarded to benefit for high coverage and unimodal distribution of QDs on the surface of THPF to increase the efficiencies of light-harvesting, charge-collection and charge-transfer. The increased efficiencies caused an enhancement in quantum efficiency of the cell and thus remarkably increased the short circuit current density ( J sc ). In addition, the decrease of charge recombination resulted in the increase of the open circuit voltage ( V oc ) as well. The QDSSC based on THPF exhibited about 2-fold higher power conversion efficiency ( η = 2.20%, J sc = 13.82 mA cm −2 , V oc = 0.572 V) than that of TiO 2 nanoparticles film (TNF) ( η = 1.06%, J sc = 6.70 mA cm −2 , V oc = 0.505 V). It provided a basis to use foams both as soft template and carrier to realize simultaneously construction and in-situ sensitization of photoanode in further work.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Kaifu Zhang,Wei Zhou,Xiangcheng Zhang,Bojing Sun,Lei Wang,Kai Pan,Baojiang Jiang,Guohui Tian,Honggang Fu
The recycle and light-harvesting of powder photocatalysts in suspended system are bottlenecks for practical applications in photocatalysis. Herein, we demonstrate the facile synthesis of self-floating amphiphilic black TiO 2 foams with 3D macro-mesoporous architectures through freeze-drying method combined with cast molding technology and subsequent high-temperature surface hydrogenation. Ethylenediamine plays bifunctional roles on acid-base equilibrium and “concrete effect” on stabilizing the 3D macro-mesoporous networks against collapsing, which also inhibit the phase transformation from anatase-to-rutile and undesirable grain growth during hydrogenation at 600 °C. The resultant black TiO 2 foams, which can float on the water, extend the photoresponse from UV to visible-light region and exhibit excellent solar-driven photocatalytic activity and long-term stability for complete mineralization of floating insoluble hexadecane and some typical pesticides. Especially for floating contaminant hexadecane, the photocatalytic reaction apparent rate constant k is ∼7 times higher than that of commercial Degussa P25 under AM 1.5 irradiation. This enhancement is attributed to the 3D macro-mesoporous networks facilitating mass transport, the super amphiphilicity benefiting rapid adsorption, the floating feature and Ti 3+ in frameworks favoring light-harvesting and spatial separation of photogenerated electron-hole pairs. The novel self-floating photocatalyst will have real practical applications for mineralizing floating contaminants in natural environment.
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高影响因子
Progress in Natural Science-Materials International
·
2012
·Vol. 22
·期 4
·265-272
·
IF 1.099
Lei Chen,Duan Weng,Zhichun Si,Xiaodong Wu
WO 3 –CeO 2 –TiO 2 catalysts for NO (nitrogen monoxide) reduction by ammonia were prepared by a sol–gel method. The catalysts were characterized by BET, XRD, Raman, NH 3 /NO adsorption and H 2 -TPR to investigate the relationships among the catalyst composition, structure, redox property, acidity and deNO x activity. WO 3 –CeO 2 –TiO 2 catalysts show a high activity in a broad temperature range of 200–480 °C. The low-temperature activity of catalysts is sensitive to the catalyst composition especially under low-O 2 -content atmospheres. It may be related to the synergistic effect between CeO x and WO x in the catalysts. On one hand, the interaction between ceria and tungsten oxide promotes the activation of gaseous oxygen to compensate the lattice oxygen consumed in NH 3 -SCR (selective catalytic reduction) reaction at low temperatures. Meanwhile, the Brønsted acid sites mainly arise from tungsten oxides, Lewis acid sites mainly arise from ceria. Both of the Brønsted and Lewis acid sites facilitate the adsorption of NH 3 on catalysts and improve the stability of the adsorbed ammonia species, which are beneficial to the NH 3 -SCR reaction.
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高影响因子
IONICS
·
2019
·Vol. 25
·期 9
·4509-4516
·
IF 2.289
Wang Shuo,Zhu Yu,Liu Bao,Wang Chengyan,Ma Ruixin
Recently, perovskite solar cells (PSCs) have attracted more attention. TiO 2 as the most common electron transfer material in PSCs has been improved by a serious of methods. In this study, a simple method was used to improve the traditional compact TiO 2 properties by doping with Sn 4+ . It demonstrated that the conductivity of the TiO 2 film could be well improved and the band-gap shifted from 3.65 to 3.55 eV with the introduction of Sn ions. The Sn–O–Ti bond was observed in the Sn:TiO 2 film according to the results of XPS. The mesostructured PSCs based on Sn:TiO 2 exhibited negligible J-V hysteresis behavior, and the J sc of the device increased distinctly. The power conversion efficiency (PCE) of the Sn:TiO 2 device was improved from 14.86 to 17.11%, compared with the reference device.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 3
·3400-3405
·
IF 3.45
Dehua Ma,Luyi Zhu,Benxue Liu
Improving the infrared reflectivity of ZrO 2 polycrystalline fibers is of great benefit to its thermal applications. In the present research, we cast a highly uniform TiO 2 coating with a thickness ranging from dozens to hundreds of nanometers on ZrO 2 fibers by utilizing hydrothermal growth. The coating bonds tightly to the ZrO 2 fibers via Zr–O–Ti chemical linkages, and the thickness of the coating can be tailored by varying the hydrothermal growth time. The TiO 2 coating, acting as a sheath towards electromagnetic radiation, not only reflected light with wavelengths ranging from the visible region to the infrared region and up to 8 μm but also shielded the Raman signals of the ZrO 2 fibers. The present research provides an efficient way to cast controllable and uniform coatings on flexible fiber materials. The obtained ZrO 2 fibers coated with TiO 2 may have applications such as reinforcement for bulk ceramics, thermal barrier coatings , aerogels , etc. , thus performing the dual functions of mechanical strengthening and thermal insulation .
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 3
·1779-1786
·
IF 3.269
Qiushi Wei,Jiewei Chen,Feng Xue,Enyong Ding
A facile and green method is developed to prepare mesoporous TiO2/graphite nanosheets composite (TGNS) that possesses uniform flower-like TiO2 particles, high surface area of 337.22 m2 g−1 and a high photocatalytic ability in the visible-light region due to the better surface integrity of graphite nanosheets (GNS) compared to rGO, which accelerates the optoelectronic transmission and prohibits the recombination of the optoelectron and hole (h+), this composite shows excellent near-infrared absorption. The TGNS composite with irregular defects on the edges was prepared using GNS via an environment-friendly physical process—high-pressure homogenization (HPH). Moreover, taking advantage of the broken edges brought on by HPH as starting active points paves a new way for the TiO2 crystal formation on carbon materials. Hence, TiO2 particles can spread uniformly on the GNS.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Dong Liang,Yaliang Huang,Fan Wu,Junjun Luo,Xinyao Yi,Jianxiu Wang,Xiaoqing Qiu
A relatively simple and bottom-up method has been developed for the preparation of g-C 3 N 4 /TiO 2 nanocomposites with coexposed {001} and {101} facets. Under acid-assisted hydrothermal conditions, the supramolecular preassembly of triazine precursor was resulted from the coordination of melamine with induced cyanuric acid , and synchronized with the large-scale etching of TiO 2 . Consequently, the g-C 3 N 4 /TiO 2 nanocomposites with coexposed {001} and {101} facets have been prepared via the simple heat treatment process . As the sintered precursor, the self-assembled supramolecules serve as a viable means for simultaneously controlling the compact and uniform contact interfaces between g-C 3 N 4 and TiO 2 . As a result, the obtained samples exhibit excellent visible photocatalytic performance for the degradation of organic pollutants and inactivation of Escherichia coli K-12 as compared to pristine g-C 3 N 4 and TiO 2. The reactive O 2 – and photoinduced holes are found to play the major roles in the photocatalytic behavior due to the energy band structure of the materials. Our results suggest that the self-assembled supramolecules can serve as the sintered precursor to prepare a high photocatalytic performance material on the field of water treatment, and pave alternative synthetic method for composites based on conjugated polymers and metallic compound .
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52199
·
IF 3.057
Wenjiao Wang,Mingming Zheng,Jiajia Ren,Mingliang Ma,Xunqian Yin,Tingxi Li,Yong Ma
Magnetic Fe 3 O 4 /MnO 2 /TiO 2 /polypyrrole (PPy) heterostructure as adsorbent for adsorbing Mn 7+ was synthesized by combining hydrothermal method and chemical oxidation method. The heterostructure was characterized by field-emission scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometer. Its saturation magnetization is 18.88 emu/g, so it is easy to separate it from the solution. The feasibility of Fe 3 O 4 /MnO 2 /TiO 2 /PPy heterostructure to remove Mn 7+ was researched in detail. It is found that the optimal pH is 2. The initial adsorption rate can reach 4.60 mg/g min. At 288.15 K, the maximum equilibrium adsorption capacity is 202.8 mg/g. Adsorption kinetics follows a pseudo second order model, as well as is determined by through membrane diffusion processes. The Langmuir isotherm model is used to describe the adsorption isotherm behavior. Besides, thermodynamic parameters indicate spontaneous adsorption behavior, and entropy of the endothermic reaction increases. Finally, the cycle test results show that the adsorbent has better cycle performance, displaying broad application prospects.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
污染控制
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高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Zhaomin Wang,Yong Cheng,Qian Li,Limin Chang,Limin Wang
Metallic Sb is deemed as a promising anode material for lithium ion batteries (LIBs) due to its flat voltage platform and high security. Nevertheless, the limited capacity restricts its large-scale application. Therefore, a simple and effective method to explore novel antimony trioxide with high capacity used as anode material for LIBs is imperative. In this work, we report a facile and efficient strategy to fabricate 1D hollow Sb 2 O 3 @TiO 2 composites by using the Kirkendall effect . When used as an anode material for LIBs, the optimal Sb 2 O 3 @TiO 2 composite displays a high reversible discharge capacity of 593 mAh g −1 at a current density of 100 mA g −1 after 100 cycles and a relatively superior discharge capacity of 439 mAh g −1 at a current density of 500 mA g −1 even after 600 cycles. In addition, a reversible discharge capacity of 334 mAh g −1 can also be obtained even at a current density of 2000 mA g −1 . The excellent cycling stability and rate performance of the Sb 2 O 3 @TiO 2 composite can be attributed to the synergistic effect of TiO 2 shell and hollow structure of Sb 2 O 3 , both of which can effectively buffer the volume expansion and maintain the integrity of the electrode during the repeated charge-discharge cycles.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
无机化学
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DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2016
·
IF 4.801
Jian Huang,Yurong He,Li Wang,Yimin Huang,Baocheng Jiang
With water scarcity becoming an increasingly critical issue for modern society, solar seawater desalination represents a promising approach to mitigating water shortage. In addition, solar seawater desalination shows great potential for mitigating the energy crisis due to its high photo-thermal conversion efficiency. However, the increasing contamination of seawater makes it difficult to generate clean water through simple desalination processes. In this work, clean water is generated by a newly designed bifunctional Au@TiO 2 core-shell nanoparticle film with a high photo-thermal conversion efficiency that is capable of photocatalysis and solar evaporation for seawater desalination. Bifunctional films of Au@TiO 2 core-shell nanoparticles with good stability were prepared. It was found that the formation of the core-shell structures played a key role in promoting the photo-thermal conversion efficiency and the evaporation of seawater, while the photocatalytic function demonstrated herein could contribute to the purification of polluted seawater. Furthermore, the film structure can serve to concentrate the NPs for the photo-reaction, as well as heat for water evaporation, improving both the photo-reaction efficiency and photo-thermal conversion efficiency. This efficient approach to solar seawater desalination, which combines evaporation with the photodegradation of pollutants, could help to address the dual issues of water scarcity and water pollution.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
太阳能利用
·
水净化
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121314
·
IF 7.2
Gangye Cen,Weiqun Chu,Jianfeng Lu,Jing Ding,Yukun Hu,Weilong Wang
Photocatalytic reduction of CO 2 to methanol using water as a proton source offers a sustainable pathway for solar energy storage and carbon neutrality. However, its practical application is hindered by low quantum efficiency, rapid charge recombination, and reliance on sacrificial agents. Herein, we developed a bimetallic AuCu alloy supported on TiO 2 nanoparticles (AuCu-TiO 2 ) via a NaBH 4 reduction method for efficient CO 2 -to-methanol conversion in the absence of sacrificial agents. The photocatalytic performance was correlated with in situ FTIR spectroscopy to unravel the synergistic roles of AuCu alloy sites and TiO 2 in mediating CO 2 reduction and H 2 O oxidation. CO 2 activation by photogenerated electrons leads to the formation of critical intermediates like COOH* and CHO*, which undergo sequential hydrogenation to produce methanol. The Au-Cu synergy facilitates the hydrogenation of COOH* to CHO*, significantly boosting methanol selectivity. By optimizing the AuCu loading and Cu/Au molar ratio, the AuCu-TiO 2 catalyst achieved a high methanol production rate of 63.31 μmol g −1 h −1 with 85.59 % selectivity. This work provides a general strategy for designing efficient bimetallic photocatalysts for selective CO 2 conversion under environmentally benign conditions.
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产品关联
DOI
高影响因子
ACS Nano
·
2026
·
IF 16
Zhiwei Chen,Hongru Zhou,Yan Liang,Zhaolin Dou,Xiaoyu Liang,Jingxuan Yang,Fanhao Kong,Min Wang
Photocatalytic biomass conversion offers a sustainable route for jet fuel production under mild conditions, while controlling the selectivity of products remains a long-standing challenge because of the involvement of various radical intermediates. Herein, we report a strategy to achieve selective switching toward jet fuel (C8–C18 hydrocarbons) in the photocatalytic decarboxylation of biomass-derived fatty acids by regulating hydrogen radical transfer on TiO2 surfaces. By modulating the valence states of Rh cocatalysts, we spatially orient radical intermediates to guide their reaction pathways: oxidized Rh (Rh3+) promotes decarboxylative hydrogenation (yielding Cn–1 alkanes), while reduced Rh (Rh0) drives decarboxylative C–C coupling (forming C2n–2 alkanes). This approach enables selective conversion of a broad range of biomass-derived acids, including fatty acids, aromatic acids, branched-chain fatty acids, and naphthenic acids, into target jet fuel hydrocarbons. This work provides an effective strategy for directing reaction pathways through spatial control of radical intermediates, advancing the development of sustainable biomass upgrading technologies.
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产品关联
DOI
PubMed
高影响因子
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