Small
·
2020
·Vol. 16
·期 48
·2004457
·
IF 11.459
Cai Liu,Miaoxin Zhang,Xin Zhang,Biao Wan,Xiaona Li,Huiyang Gou,Yexin Wang,Fuxing Yin,Gongkai Wang
Nano heterostructures relying on their versatile construction and the breadth of combined functionality have shown great potential in energy storage fields. Herein, 2D sandwiched MoSe 2 /TiO 2− x /graphene nano heterostructures are designed by integrating structural and functional effects of each component, aiming to address the rate capability and cyclic stability of MoSe 2 for sodium ion capacitors (SICs). These 2D nano heterostructures based on graphene platform can facilitate the interfacial electron transport, giving rise to fast reaction kinetics. Meanwhile, the 2D open structure induces a large extent of surface capacitive contribution, eventually leading to a high rate capability (415.2 mAh g −1 @ 5 A g −1 ). An ultrathin oxygen deficient TiO 2− x layer sandwiched in these nano heterostructures provides a strong chemical-anchoring regarding the products generated during the sodiation/desodiation process, securing the entire cyclic stability. The associated sodiation/desodiation mechanism is revealed by operando and ex situ characterizations, which exhibits a strong solid electrolyte interphase (SEI) dependence. The simulations verify the dependent sodiation products and enhanced heterostructural chemical-anchoring. Assembled SICs based on these nano heterostructures anode exhibit high initial Coulombic efficiency, energy/power densities, and long cycle life, shedding new light on the design of nano heterostructure electrodes for high performance energy storage application.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 6
·1062-1069
·
IF 1.071
Wang Hui,Wang Jiafeng,Zhang Lei,Yu Qinqin,Chen Zewen,Wu Shengji
In the present work, a remarkable combination of non-thermal plasma and photocatalyst was developed to widen the operating temperature window of selective catalytic reduction(SCR) of NO x with CH 4 , especially to improve the low-temperature removal efficiency of NO x . It was shown that the operating temperature window was significantly widened. Among all the catalysts prepared, 1%Ag 2 O/TiO 2 showed the highest catalytic activity for NO x removal due to the utilization of near ultraviolet light. The conversion of NO x to N 2 over the in-plasma 1%Ag 2 O/TiO 2 photocatalyst at 60 and 300 °C could achieve 31.8% and 53.0%, respectively. The combination mode of plasma and catalyst affected NO x removal efficiency greatly, the in-plasma catalysis outperformed the post-plasma catalytic mode remarkably, signifying the contribution of photocatalytic processes on the catalysts. Meanwhile, the characterizations of the catalyst demonstrated that the morphology and structure of the Ag 2 O/TiO 2 catalyst were unchanged throughout the non-thermal plasma and photocatalytic processes, implying the superior stability of the catalyst.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Niu Yanyan,Luo Guiling,Xie Hui,Zhuang Yujiao,Wu Xianqun,Li Guangjiu,Sun Wei
A photoelectrochemical (PEC) aptasensor for Pb(II) detection is described. A nanocomposite consisting of CdS (2.5 μm) and TiO 2 nanoparticles (10 nm) was used as a photoactive material, and gold nanochains (Au NCs) as the support for immobilization of the Pb(II)-binding aptamer. The quercetin-copper(II) complex was further employed as the intercalator for the improvement of the photoactivity by embedding it into dsDNA. In the presence of Pb(II), a Pb(II)-stabilized G-quadruplex was formed between Pb(II) and DNA S1. This is accompanied by unwinding of the dsDNA and the release of the quercetin-copper(II) complex from the surface of the sensor. This results in a decrease of the photocurrent that drops linearly from 5.0 × 10 −12 to 1.0 × 10 −8 mol·L −1 Pb(II) concentration range with a detection limit of 1.6 × 10 −12 mol·L −1 . The method was applied to the determination of Pb(II) in various samples and gave satisfactory results.
A photoelectrochemical aptasensor was fabricated for the detection of Pb(II) based on CdS-TiO 2 nanocomposite modified indium tin oxide (ITO) electrode. Gold nanochains (AuNCs) were used as anchor to immobilize the aptamers S1 and S2 that form a double helix structure by DNA hybridization. After embedding of quercetin-copper(II) complex as intercalator and electron donor, the concentrations of Pb(II) were determined by the changes of photocurrents.
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Journal of Physical Chemistry C
·
2018
·
IF 4.484
Wenting Sun,Sugang Meng,Sujuan Zhang,Xiuzhen Zheng,Xiangju Ye,Xianliang Fu,Shifu Chen
In the paper, the synthesis of ZnO/TiO2 nanocomposites with different main parts (TiO2 or ZnO) is studied. When TiO2 is the main part of the ZnO/TiO2 heterojunction photocatalysts (ZnO/TiO2), the photocatalytic activity is decreased rapidly with the increase of the amount of ZnO. The reason may be attributed to the relative p–n junction (p-ZnO/n-TiO2) produced between ZnO and TiO2. The migration directions of the electrons and holes in the relative p–n junction are opposite to the transfer directions of the photogenerated electrons and holes in the valence band (VB) and conduction band (CB). However, when ZnO is the primary part of the heterojunction photocatalysts (TiO2/ZnO), the photocatalytic activity of the samples increases with the increase of the TiO2 amount up to 5% (95% ZnO/TiO2). The reason may be that the migration directions of the electrons and holes in the relative p–n junction (p-TiO2/n-ZnO) are the same as the transfer directions of the photoexcited electrons and holes in VB and CB between the two semiconductors. It is proposed that the conductivity of the heterojunction photocatalyst will be changed with the difference of content for the two semiconductors, which in turn affects the migration directions of the electrons and holes in the heterojunctions and their photocatalytic activity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Liping Ren,Wei Zhou,Bojing Sun,Haoze Li,Panzhe Qiao,Yachao Xu,Jiaxing Wu,Kuo Lin,Honggang Fu
Defect-engineered magnetic γ-Fe 2 O 3 ultrathin nanosheets/mesoporous black TiO 2 hollow sphere heterojunctions (γ-Fe 2 O 3 /b-TiO 2 ) are fabricated by a metal-ion intervened hydrothermal technique and high-temperature hydrogenation, which exhibit wide-spectrum response and magnetic separation. The specific surface area, pore size and pore volume of the resultant γ-Fe 2 O 3 /b-TiO 2 with hollow structure are ∼63 m 2 g −1 , 10.5 nm and 0.14 cm 3 g −1 , respectively. After surface hydrogenation, α-Fe 2 O 3 nanosheets are converted to γ-Fe 2 O 3 ultrathin nanosheets (∼6 nm) combined with the formation of surface defects. The ultrathin nanosheet structure facilitates the surface engineering and also favors the diffusion and transportation of photogenerated charge carriers. The apparent rate constant (k) of defect-engineered γ-Fe 2 O 3 /b-TiO 2 photocatalytic degradation biotoxic tetracycline is ∼3 times higher than that of α-Fe 2 O 3 /b-TiO 2 under AM 1.5 irradiation. The enhancement is attributed to the introduction of narrow bandgap unit-cell-thick γ-Fe 2 O 3 nanosheets, the hollow structure and the defect engineering, which are beneficial to solar-light-harvesting and rapid electron transport, and spatial separation of photogenerated charge carriers. The photocatalytic degradation mechanism is also proposed. The novel magnetic γ-Fe 2 O 3 /b-TiO 2 heterojunction is a promising photocatalyst for recovering the domestic sewage in environment.
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RSC Advances
·
2016
·Vol. 6
·期 29
·24154-24163
·
IF 3.289
Xianzhu Ye,Hua Wang,Kang Zheng,Zhaofeng Wu,Haifeng Zhou,Xingyou Tian
A simple chemical assembly to construct a compatible nano-TiO2-coating on a wood surface has been reported using polyethyleneimine and (3-aminopropyl) triethoxysilane for recycled wood–polypropylene composites (WPCs). Crystal features, ZETA potential, and FTIR analysis indicated that the assembly was stable and sufficient, which could be verified further using SEM imaging. Via a three-dimensional hydrophobic network in the composite, water absorbance decreased from 2.89 wt% to 0.72 wt%. Ultraviolet and near-infrared resistance were found to be increased for the dispersive nano-network in the composite matrix. In particular, when the assembling nano-interface was 2.0 wt% for the composite, as well as the tensile strength, the elongation at break was enhanced by about 85%. Tg was also enhanced for strong interfacial adhesion and sufficient load transfer. Also, due to the shielding of the nano-network and the coupling aspect of the assembly, the decomposition temperature (Td) of wood and polypropylene were enhanced by 79 °C and 27 °C, respectively.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yan Liang,Yongqing Wang,Junjie Qian,Mingmin Bai,Yulong Yang,Ruiqiang Yang,Long Cheng,Yue Cha
In this study, in-situ growth of columnar mullite reinforced silicon carbide porous membrane supports were prepared, and the addition of TiO 2 helped to reduce the sintering temperature for the anisotropic growth of necked columnar mullite crystals. The synthesis of in situ columnar mullite makes reasonable use of the oxidized silica of silicon carbide, and in turn reduces the loss of the silicon carbide porous membrane support under strong corrosive conditions. The material showed a flexural strength of up to 72.95 MPa, and a water flux of 31612.83 L·m -2 ·h -1 ·bar -1 when sintered for 2 h in an air environment at 1250 °C. The flexural strength after corrosion in 20 vol% H 2 SO 4 and 1 wt% NaOH solution (90 °C) exceeded 93%. This shows that this porous silicon carbide ceramic membrane scaffold has potential applications in the field of water treatment under harsh environments.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanfei Lu,Lianqing Chen,Chengjiang Zhang,Mengxue Yu,Kangle Lv,Xianghong Li,Benjun Xi
The development of photocatalytic nano-purifiers with high electrons and holes separation efficiency and high-photocatalytic activity is essential in treating water and air pollution. In this paper, novel nano-purifiers with S-scheme faceted heterojunction created between BiOCl nanosheets (110) facets and TiO 2 hollow nanocubes (001) facets were successfully fabricated. In nano-purifiers, BiOCl nanosheets are enriched with oxygen vacancies capable of trapping electrons, which synergize with the unique S-scheme faceted heterojunction charge transfer mechanism to facilitate carrier separation and migration to a large extent. Herein, BiOCl(110) nanosheets/TiO 2 (001) hollow nanocubes nano-purifiers (BTHNs) were significantly enhanced in photocatalytic treatment of water and air pollution and were not inferior to other cleaning agents. The obtained 15BTHNs showed the best photocatalytic purification ability among the same series of products. 15BTHNs could degrade 99.9% of RhB in 70 min, which was 25 times higher than that of pure THNs, and effectively removed 44.8% of NO. Moreover, the reduction rate of Cr (Ⅵ) for 15BTHNs reached 99.9% in 90 min, with a kinetic constant 21.5 times higher than that of pure THNs. Active species trapping experiments revealed that four active species of BTHNs contributed to the RhB oxidation reaction in the following order:·OH>h + >·O 2 - >e - , and the contribution rates of 15BTHNs were 45.0%, 38.0%, 12.3%, and 4.7%, respectively. The appropriate ratios of oxidizing TiO 2 to reducing BiOCl in 15BTHNs allowed the generated active species to be fully utilized, achieving oxidation-reduction equilibrium as well as improving the photocatalytic efficiency. This work reveals that the S-scheme faceted heterojunction formed in the BiOCl/TiO 2 nano-purifier was a progressing approach for water and air cleaning.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiaoqian Sun,Rongjie Li,Yilin Wang,Kaijia Liu,Yuhui Qiu,Kunxiang Deng,Yixi Xie,Pengcheng Zhao,Junjie Fei
The remarkable pharmacological activities of flavonoids and their effects on human health have prompted many studies. To solve the problem that flavonoids are difficult to be accurately quantified, a novel photoelectrochemical (PEC) sensor based on CdIn 2 S 4 /b-TiO 2 /GO was created to detect the baicalein (BCA). By using physical ultrasonic compounding, a straightforward and effective CdIn 2 S 4 /b-TiO 2 /GO composite was created. The composite’s photoelectric effect was 14 times greater than that of the individual material. When BCA was present, a flavonoid-TiO 2 nanoconjugate was formed based on the interaction between b-TiO 2 and BCA. This interaction prevented the formation and decreased charge transfer of photoporous holes, resulting in a significant decline in photocurrent. Therefore, the PEC sensor based on the change of the electrode surface state can realize the sensitive detection of BCA. The PEC sensor has a wide linear detection range of 1 nM − 30 μM with a limit of detection of 0.5 nM. In addition, the sensor has exhibited excellent accuracy in detecting BCA in the roots and leaves of Scutellaria baicalensis, which can be used for the detection of actual samples.
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Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Zhihui Zhang,Jianxin Deng,Lingxuan Fan,Junyan Wang
The paper presents the fabrication of chessboard-structured (CF x ) n /CaF 2 /C–ZrO 2 /TiO 2 lubricant-hard alternate coatings by electrospray mask in-situ forming technique. The influence of the coating's structure and components on microstructure, film-substrate adhesion strength, and reciprocating wear performance were studied. The results showed that the chessboard structure of the hard coating had a high surface energy of 83.45 mJ/m 2 , which enhanced the adhesion of the lubricant coating. The addition of graphite (C) improved the uniformity, thermal stability, and lubrication of the (CF x ) n /CaF 2 lubricant coating. Within the 25–600 °C temperature range, the chessboard-textured (CF x ) n /CaF 2 /C–ZrO 2 /TiO 2 lubricant-hard alternate coating all exhibited low friction coefficients, which attributed to the synergistic effect between chessboard structure and coating material.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 25
·17268-17278
·
IF 3.906
Weicheng Huang,Jinxin Wang,Lang Bian,Chaoyue Zhao,Danqing Liu,Chongshen Guo,Bin Yang,Wenwu Cao
A WO3−x/TiO2−x nanotube array (NTA) heterojunction photoanode was strategically designed to improve photoelectrocatalytic (PEC) performance by establishing a synergistic vacancy-induced self-doping effect and localized surface plasmon resonance (LSPR) effect of metalloid non-stoichiometric tungsten suboxide. The WO3−x/TiO2−x NTA heterojunction photoanode was synthesized through a successive process of anodic oxidation to form TiO2 nanotube arrays, magnetron sputtering to deposit metalloid WO3−x, and post-hydrogen reduction to engender oxygen vacancy in TiO2−x as well as crystallization. On the merits of such a synergistic effect, WO3−x/TiO2−x shows higher light-harvesting ability, stronger photocurrent response, and resultant improved photoelectrocatalytic performance than the contrast of WO3−x/TiO2, WO3/TiO2 and TiO2, confirming the importance of oxygen vacancies in improving PEC performance. Theoretical calculation based on density functional theory was applied to investigate the electronic structural features of samples and reveal how the oxygen vacancy determines the optical property. The carrier density tuning mechanism and charge transfer model were considered to be associated with the synergistic effect of self-doping and metalloid LSPR effect in the WO3−x/TiO2−x NTA.
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LANGMUIR
·
2025
·
IF 3.9
Qimin Zhao,Jiayi Huang,Yongkang Yan,Danhua Ge,Tao Liu,Xiaojun Chen
Developing light-responsive nanozymes with integrated activity and stability holds significant importance for highly sensitive and accurate sensing in food safety and environmental protection. Herein, we developed a dual-mode (colorimetric and fluorescent) sensor based on an Fe-doped TiO2 nanosphere for d-penicillamine (D-PA) detection. The unique hollow structure of Fe-TiO2 provides a large surface area and abundant oxygen vacancies while facilitating rapid Fe(II)/Fe(III) cycling, collectively resulting in enhanced light-responsive peroxidase (POD)-like activity. Under light irradiation, the Fe-TiO2 promoted the generation of abundant reactive oxygen species, which oxidize TMB to blue oxTMB. Furthermore, the Fukui index and reaction kinetic trials indicated that the detection mechanism was primarily based on the antioxidant effect and redox activity of D-PA. The proposed sensor demonstrated detection limits (LODs) of 0.054 μM (colorimetric) and 0.40 μM (fluorescence), with 92.2–107.4% recovery and relative standard deviation < 4.4% in milk, tap water, and fetal bovine serum, along with outstanding reproducibility and stability. This work provides new insights to synthesize light-responsive nanozymes and integrated multimode sensing platforms.
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