DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 13
·4296-4302
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IF 4.029
Tao Ji,Ze Cui,Wenlong Zhang,Yunjiu Cao,Yongfang Zhang,Shu-ang He,Mingdong Xu,Yangang Sun,Rujia Zou,Junqing Hu
Herein, we report a photocatalytic heterojunction device of rutile TiO2 nanorod arrays based on a p–n silicon junction (TiO2@PN) and its full absorption of ultraviolet and visible light for synergistic photodegradation. The fabricated TiO2@PN had excellent photocatalytic degradation of methyl orange (MO) under irradiation of a 300 W Xe lamp, and its pseudo-first-order rate constant k was 0.221 h−1, which was greatly higher than that for TiO2 nanorod arrays based on an n–p silicon junction (TiO2@NP, 0.078 h−1) and glass (TiO2@G, 0.032 h−1). The higher photocatalytic performance of TiO2@PN could be attributed to the fact that the photovoltage (PV) of the p–n junction promotes separation of the electron–hole pairs of the TiO2, and the holes are thus left within the TiO2 nanorods to produce a strong oxidant of hydroxyl radicals (˙OH). Moreover, this heterojunction device could be easily fabricated in a large size for easy recovery and recycling, which shows its promise in the solar-driven degradation of environmental pollution.
研究领域:
材料科学
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环境科学
·
光催化
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hongli Zheng,Huan Yi,Wen Lin,Hong Dai,Zhensheng Hong,Yanyu Lin,Xiuhua Li
Herein, a new sandwich-type electrochemiluminescence (ECL) immunosensor was established on the dual-roles of tetragonal rutile TiO 2 mesocrystals (TRM) to realize the sensitive detection of zearalenone (ZEA). On the one hand, the poly (amidoamine) dendrimers (PAAD)-functionalized TRM, combining the advantages of hyper-branched of PAAD and the high nanoporosity , large surface area of TRM, was served as the sensing matrix to immobilize enough capturing antibody, realizing the signal amplification. On the other hand, TRM was applied as an effective probe platform to absorb Ru (bpy) 3 2+ and simultaneously immobilize the secondary antibody (Ab 2 ). Here, based on the superior properties of TRM and the new bridge of 4-Mercaptophenylboronic acid (4-MPBA) for the high affinity of Ab 2 and TRM, a strong and stable ECL emission was realized. Additionally, cysteamine first emerging as a blocker was proved to sensitize the ECL response of Ru (bpy) 3 2+ , which further amplified the ECL signal, avoiding addition of exogenous coreactants into testing solution. Finally, the sandwich-type ECL immunosensor enabled the real samples detection of ZEA with a lower detection limit and wider linear range.
研究领域:
分析化学
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食品安全检测
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DOI
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 3
·898-909
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IF 5
Haohui Gu,Feng Liang,Xiaohan Wang,Shuaibing Wu,Gongye Lv,Haijun Zhang,Shaowei Zhang,Lilin Lu,Zhijun Dong
The design of heterojunction photocatalysts is regarded as a very effective method to solve the high recombination rate of photogenerated charge carriers for CO2 photoreduction into hydrocarbons, and interface engineering is urgently required to achieve high efficiency. Herein, graphitic carbon nitride (g-C3N4, CN) was uniformly grown on the surface of nitrogen-doped rutile TiO2 (NT) nanorods by in situ deposition, and a NT@CN core/shell step-scheme (S-scheme) heterojunction system composed of NT nanorods and g-C3N4 was synthesised. The as-synthesised heterojunction containing 55 wt% g-C3N4 delivered the highest CO2 photoreduction activity (33.35 μmol g−1 for CO) without additional cocatalysts or external sacrificial agents, which was 7.1 times higher than that of bare NT nanorods. This improved CO2 reduction activity was attributable to the large surface area and impactful S-scheme heterostructure, which imparted the catalyst with sufficient visible-light harvesting ability, promoted the segregation and transformation of the photoinduced charge pairs, and enhanced the redox ability of the carriers. Concurrently, the NT@CN photocatalyst exhibited excellent reusability and stability. This work offers a new basis for designing and preparing rutile TiO2-based S-scheme heterojunctions with enhanced CO2 reduction performance.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Meng Wang,Jialong Duan,Jian Du,Xiya Yang,Yanyan Duan,Tingting Zhang,Qunwei Tang
Tailored optimization of perovskite solar cells (PSCs) is a persistent objective to achieve the ultimate commercialization purpose, in which the electron/hole transport layer with thickness on the nanometer scale is generally required to maximize the charge collection and minimize the series resistance. Therefore, precise control on the fabrication technology of the charge transport layer is important. Herein, one-dimensional (1D) rutile TiO2 nanorod arrays with a thickness of 1.8 μm have been fabricated and employed as a potential electron extraction layer for high-efficiency all-inorganic CsPbBr3 PSCs for the first time. Arising from the sufficient carrier mobility, excellent conductivity, and superior charge extraction ability by means of regulating the donor concentration with nitrogen atoms, a champion efficiency of 8.50% has been achieved with excellent long-term stability after 50 days storage in air conditions, which is comparable to that of the 200 nm-thick TiO2 layer tailored device. The primary results demonstrate that the TiO2 layer with micrometer scale thickness is also feasible to effectively collect the photogenerated carriers and realize considerable solar-to-electric conversion ability, providing multifarious technologies to fabricate the electron extraction layer.
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 45
·2002629
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IF 16.836
Chao Wang,Jiansheng Zhang,Xianfen Wang,Chunfu Lin,Xiu Song Zhao
Flexible electrodes with high charge storage capacity, low solid-state diffusion resistance toward charges, and excellent mechanical properties are needed for fabricating flexible energy storage devices. In this paper, an approach is described to synthesize a composite material with hollow rutile TiO 2 cuboid arrays supported on carbon fiber cloth (H-TiO 2 @CFC). This composite material is used as a self-supporting and binder-free anode for sodium-ion storage, delivering reversible charge capacities of 287.3 at 0.1 C and 103.3 mAh g −1 at 50 C, respectively. The observed excellent electrochemical performance of the H-TiO 2 @CFC electrode is mainly attributed to its unique architecture, which facilitates ion transport, improves electron conductivity, and enables active surface reactivity toward sodium ions. In situ X-ray diffraction characterization results reveal a nearly zero strain structure of the hollow rutile TiO 2 in H-TiO 2 @CFC against electrochemical cycling. An analysis of the charge storage mechanism reveals a significant pseudocapacitance contribution to the charge storage, accounting for the observed high-rate performance of the electrode. A flexible full cell fabricated with the H-TiO 2 @CFC as the anode and Na 3 V 2 (PO 4 ) 3 as the cathode exhibits both excellent electrochemical properties and flexibility against mechanical deformation, demonstrating the great promise of the H-TiO 2 @CFC composite material for flexible battery cells.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1518-1528
·
IF 5.721
Jin Zhang,Linjuan Pei,Jie Wang,Pengqi Zhu,Xianmo Gu,Zhanfeng Zheng
Ru/TiO2 catalysts exhibit excellent catalytic performance for selective reduction of 4-nitroacetophenone to 4-aminoacetophenone at normal temperature and atmospheric hydrogen pressure. Moreover, 99.9% selectivity to 4-aminoacetophenone can be obtained over 2.7 wt% Ru/TiO2(anatase) catalyst even in a relatively wide temperature (55–115 °C) and time (1–12 h) range. Its excellent catalytic performance is derived from the activation of H2 on the Ru nanoparticles at atmospheric pressure and the strong interaction of nitro groups with the support surface. Additionally, Ru nanoparticles supported on different crystalline TiO2 phases (anatase and rutile) result in different reaction pathways for 4-nitroacetophenone. Since the Ti–Ti distance on the rutile surface is smaller than that on the anatase surface, the hydroxylamine species adsorbed on the Ti atoms of rutile are more susceptible to the coupling reaction. Therefore, Ru/TiO2(rutile) causes a series of intermediates to accumulate during the conversion process, while Ru/TiO2(anatase) allows the highly selective conversion of 4-nitroacetophenone to 4-aminophenone. In addition, Ru/TiO2(anatase) can achieve chemoselective reduction of nitroaromatics to the corresponding anilines in the presence of –CN, –CHO, and –COOH, especially nitroaromatics containing CC and CC, indicating the excellent applicability.
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Biosensors-Basel
·
2022
·Vol. 12
·期 10
·865
·
IF 5.743
Yuting Qiao,Xianrong Liu,Zhi Jia,Peng Zhang,Li Gao,Bingxin Liu,Lijuan Qiao,Lei Zhang
Abnormal protein phosphorylation may relate to diseases such as Alzheimer’s, schizophrenia, and Parkinson’s. Therefore, the real-time detection of phosphoproteins in sweat was of great significance for the early knowledge, detection, and treatment of neurological diseases. In this work, anatase/rutile TiO2was in situ grown on the MXene surface to constructing the intercalation structure MXene@anatase/rutile TiO2ternary heterostructure as a sensing platform for detecting phosphoprotein in sweat. Here, the intercalation structure of MXene acted as electron and diffusion channels for phosphoproteins. The in situ grown anatase/rutile TiO2with n-n-type heterostructure provided specific adsorption sites for the phosphoproteins. The determination of phosphoprotein covered concentrations in sweat, with linear range from 0.01 to 1 mg/mL, along with a low LOD of 1.52 μM. It is worth noting that, since the macromolecular phosphoprotein was adsorbed on the surface of the material, the electrochemical signal gradually decreased with the increase of phosphoprotein concentration. In addition, the active sites in the MXene@anatase/rutile TiO2ternary heterojunction and synergistic effect of the heterojunction were verified by first-principle calculations to further realize the response to phosphoproteins. Additionally, the effective diffusion capacity and mobility of phosphoprotein molecules in the ternary heterojunction structure were studied by molecular dynamics simulation. Furthermore, the constructed sensing platform showed high selectivity, repeatability, reproducibility, and stability, and this newly developed sensor can detect for phosphoprotein in actual sweat samples. This satisfactory sensing strategy could be promoted to realize the noninvasive and continuous detection of sweat.Keywords:sweat;phosphoprotein;MXene;anatae/rutile TiO2;intercalation structure;healthcare monitoring
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Miaomiao Xiang,Huihui Liu,Chenxi Huang,Yue Li,Hualing Zeng,Xiang Shao
Molybdenum disulfide (MoS2) has attracted considerable interest due to its superior electronic and optical properties, which have seen promising applications in optoelectronics and catalysis. Chemical vapor deposition (CVD) has been successfully applied in synthesizing MoS2 on various substrates. However, it remains a great challenge to fabricate high-quality MoS2 sheets with well-controlled micro/nano size and homogeneous distribution over the functional substrates such as active metal oxides. Herein, we have developed a two-step synthetic strategy via depositing MoO3 first followed by subsequent vulcanization, to grow single-layer MoS2 on an atomically flat rutile TiO2(110) (r-TiO2(110)) substrate. This method not only very well controls the size as well as the spatial distribution of MoS2 nanosheets over the TiO2 surface but also averts the formation of contaminative species at the heterojunction while maintaining the atomic structure of the substrate surface. The extensive characterizations reveal that the formation of MoS2 derives from the sulfurization of the singly dispersed Mo6+ and Mo5+ species in the surface/subsurface region instead of the aggregated MoO3 patches on top of the TiO2 surface. Such a mechanism may dictate a general way for synthesizing high-quality transition-metal dichalcogenides (TMDs) over a variety of functional substrates.
研究领域:
材料科学
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化学
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Science China-Materials
·
2018
·Vol. 61
·期 6
·822-830
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IF 4.318
Xiao Fang,Zhou Wei,Sun Bojing,Li Haoze,Qiao Panzhe,Ren Liping,Zhao Xiaojun,Fu Honggang
Oxygen vacancy (V O ) plays a vital role in semiconductor photocatalysis. Rutile TiO 2 nanomaterials with controllable contents of V O (0–2.18%) are fabricated via an in situ solid-state chemical reduction strategy, with color from white to black. The bandgap of the resultant rutile TiO 2 is reduced from 3.0 to 2.56 eV, indicating the enhanced visible light absorption. The resultant rutile TiO 2 with optimal contents of V O (∼2.07%) exhibits a high solar-driven photocatalytic hydrogen production rate of 734 μmol h −1 , which is about four times as high as that of the pristine one (185 μmol h −1 ). The presence of V O elevates the apparent Fermi level of rutile TiO 2 and promotes the efficient electronhole separation obviously, which favor the escape of photogenerated electrons and prolong the life-time (7.6×10 3 ns) of photogenerated charge carriers, confirmed by scanning Kelvin probe microscopy, surface photovoltage spectroscopy and transient-state fluorescence. V O -mediated efficient photogenerated electron-hole separation strategy may provide new insight for fabricating other high-performance semiconductor oxide photocatalysts.
研究领域:
材料科学
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光催化
·
可再生能源
·
半导体物理
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高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-17
·
IF 2.4
Gan Wei,Guo Yan,Zhu Dan,Ling Min,Jiang Can,Zhang Shengfu
With the increasing problems caused by water pollution, the use of photocatalytic oxidation to remove pollutants from wastewater is a sustainable strategy. However, it is challenging to develop well-designed photocatalysts with high photo-quantum efficiency and the comprehension of their photocatalytic reaction mechanisms. Herein, a R/A-TiO 2 /Ti 3 C 2 T x (R: rutile; A: anatase) photocatalyst with different ratios of rutile and anatase phases was prepared by a facile hydrothermal method. The results showed that the number of rutile and anatase phases could be readily regulated by adjusting the dosage of titanium isopropoxide (TTIP) and Ti 3 C 2 T x . The prepared R/A-TiO 2 /Ti 3 C 2 T x -0.2 contained a mass fraction of 42% rutile phase and 58% anatase phase, with the interface between the two phases exhibited a tightly bonded structure. Meanwhile, the heterojunction between the heterophase TiO 2 and Ti 3 C 2 T x interfaces improved the photo-quantum efficiency of R/A-TiO 2 /Ti 3 C 2 T x , and the degradation efficiency of Rhodamine B (RhB) by R/A-TiO 2 /Ti 3 C 2 T x -0.2 was 77.82% in 2 h under ultraviolet light illumination. Ultimately, the active species capture experiments verified that the primary active species in the photocatalytic reaction was h + , ·OH, and·O 2 − . This work could shed light on the new approach to the rational design of high-efficiency heterophase TiO 2 -based photocatalysts. Graphical R/A-TiO 2 /Ti 3 C 2 T x photocatalysts with heterojunctions were controllably synthesized by an EDTA-2Na-assisted hydrothermal method.
研究领域:
环境科学
·
材料科学
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Molecular Catalysis
·
2024
·
IF 3.9
Nan Zhou,Xiaoqing Jia,Siyuan Chen,Huafan Li,Feifei Li,Botao Qiao,Hailian Tang,Guoyi Bai
CO 2 methanation is an effective way for CO 2 recycling, and nickel-based catalysts have attracted much attention in this field due to their excellent CH 4 selectivity and cost-effectiveness; however, their applications are limited by their suboptimal catalytic activity. In this work, the catalytic activity of Ni-rutile-based catalysts was increased by almost an order of magnitude simply by doping the rutile with Fe. Series characterizations show that three factors that mainly contributed to the improved catalytic performance of the Ni/Fe-Rutile, which are the reduction of the Ni size, the increase of the basic sites, and the inhibition of the encapsulation of the Ni particles by the support. With Fe doping, the OH and oxygen vacancies on the rutile surface were reduced, which made the support difficult to reduce and thus suppressed the encapsulation of Ni by the support. As a result, the number of exposed active sites on the Ni/Fe-Rutile which with a smaller Ni size was further successfully increased, and the catalytic activity was significantly improved. This study provides new ideas for the design of activity-enhanced supported catalysts from the perspective of tuning the metal-support interaction and may be applicable to other reducible oxide-supported metal catalysts.
研究领域:
催化化学
·
材料科学
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高影响因子
ACS Sensors
·
2025
·
IF 9.1
Wanying Cheng,Xiaowei Li,Chaohan Han,Yu Liu,Aoqun Xue,Haipeng Dong,Xinghua Li,Changlu Shao,Yichun Liu
Wearable gas sensors offer remarkable advantages in terms of portability and real-time monitoring, rendering them highly promising for various applications such as environmental detection, health monitoring, and early disease diagnosis. However, the most widely used oxide semiconductor gas sensors encounter substantial challenges in achieving mechanical flexibility and room-temperature gas detection due to their inherent rigidity, brittleness, and reliance on high operating temperatures. Herein, an all-inorganic wearable oxide semiconductor gas sensor is fabricated by depositing the anatase/rutile TiO2 (TiO2-A/R) homojunction on a flexible yttria-stabilized zirconia (YSZ) nanofiber substrate using atomic layer deposition technology. The combination of the YSZ nanofiber and the ultrathin TiO2 sensing layer (∼13 nm) endows the wearable sensor with tiny linear strains (0.55%) when subjected to a radius of curvature of 25 μm. As a result, the wearable inorganic YSZ/TiO2-A/R sensor can be folded multiple times without fracturing and maintain a stable electrical connectivity during cyclic bending. Furthermore, the utilization of photoactive TiO2 homojunctions allows the sensor to be activated by UV light and operated at room temperature. The efficient separation efficiency of photogenerated carriers, which stems from the interfacial electric field of TiO2 homojunctions, significantly enhances the sensor’s response, leading to a low detection limit of 0.15 ppm for acetone. In addition, the wearable sensor was anchored on a mask and successfully utilized for the detection of a simulated breathing gas of diabetics; the real-time and stable response signals demonstrate its potential for noninvasive diabetes diagnosis. This study provides a valuable reference for the advancement of wearable room-temperature inorganic semiconductor gas sensors, offering valuable insights into their potential applications in disease diagnosis.
研究领域:
材料科学
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医学
·
电子工程
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高影响因子
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