ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Qingxiang Zhou,An Xing,Jing Li,Danchen Zhao,Kuifu Zhao,Man Lei
Present study described a high performance and rapid degradation technique for bisphenol A under simulated solar light irradiation by photoelectrocatalytic degradation with CeO 2 and reduced graphene oxide co-modified TiO 2 nanotube arrays (RGO-CeO 2 -TNAs) in combination with Fenton reaction. In the photoelectrocatalytic system (PEC), CeO 2 and reduced graphene oxide co-modification significantly improved the degradation efficiency due to the synergistic effect of them. With the introduction of Fenton reaction , the expected further effective enhancement of degradation efficiency was achieved. Under the optimal condition, the degradation of BPA reached a high reaction rate constant of 0.0146 min −1 . In comparison, photoelectrocatalytic process exhibited higher degradation efficiency than that of photocatalytic-Fenton (PC-Fenton), electrocatalytic-Fenton (EC-Fenton) and Fenton processes. The stability and reusability of RGO-CeO 2 -TNAs was investigated and the results demonstrated that rarely decline of degradation efficiency was achieved and the degradation efficiencies of the repeated degradation experiments were all over 80% for ten runs. All these indicated that there was markedly synergistic enhancement effect between Fenton reaction and PEC process using RGO-CeO 2 -TNAs as the photoelectrode for degradation of bisphenol A. All these results indicated thatpresent method provided a potential powerful tool for the control and removal of bisphenol A and other pollutants in the future.
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高影响因子
ChemSusChem
·
2017
·Vol. 10
·期 14
·2945-2954
·
IF 7.226
Li Chen,Weilin Chen,Jianping Li,Jiabo Wang,Enbo Wang
Graphical Sandwich filling : Polyoxometalate (POM) can act as an electron-transfer medium to decrease electron recombination in a photoelectric device. POM/TiO 2 is prepared as an electronic interface layer by a facile layer-by-layer self-assembly method. This interface layer is added to the photoanode of quantum dot-sensitized solar cells (QDSCs) for improved performance of the QDSCs. Electron recombination occurring at the TiO 2 /quantum dot sensitizer/electrolyte interface is the key reason for hindering further efficiency improvements to quantum dot sensitized solar cells (QDSCs). Polyoxometalate (POM) can act as an electron-transfer medium to decrease electron recombination in a photoelectric device owing to its excellent oxidation/reduction properties and thermostability. A POM/TiO 2 electronic interface layer prepared by a simple layer-by-layer self-assembly method was added between fluorine-doped tin oxide (FTO) and mesoporous TiO 2 in the photoanode of QDSCs, and the effect on the photovoltaic performance was systematically investigated. Photovoltaic experimental results and the electron transmission mechanism show that the POM/TiO 2 electronic interface layer in the QDSCs can clearly suppress electron recombination, increase the electron lifetime, and result in smoother electron transmission. In summary, the best conversion efficiency of QDSCs with POM/TiO 2 electronic interface layers increases to 8.02 %, which is an improvement of 25.1 % compared with QDSCs without POM/TiO 2 . This work first builds an electron-transfer bridge between FTO and the quantum dot sensitizer and paves the way for further improved efficiency of QDSCs.
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PubMed
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6444-6452
·
IF 3.849
Li Zhang,Dichao Shi,Baocang Liu,Geng Zhang,Qin Wang,Jun Zhang
A facile hydrothermal etching process was developed to synthesize TiO2/Ag nanocubes for enhanced photocatalytic application. The synthesis was carried out by chemically etching hollow @TiO2 spheres in the presence of an AgF or AgF/NaF solution under hydrothermal conditions. Utilizing F− as a morphology-directing agent and Ag+ as an Ag source during the etching process, TiO2 nanocubes can be easily formed with their active high-energy facets exposed and Ag nanoparticles can be in situ deposited simultaneously on the surface of the TiO2 nanocubes to generate hybrid TiO2/Ag nanocubes. The resulting TiO2/Ag nanocubes were well controlled with Ag nanoparticles uniformly distributed on the surface of the TiO2 nanocubes. The morphologies of TiO2/Ag can be altered from ellipsoidal to cubic shapes depending on the amounts of AgF or AgF/NaF used for chemical etching. Due to the exposure of the active high-energy facets of TiO2 and the uniform deposition of Ag nanoparticles, the obtained TiO2/Ag nanocubes showed superior catalytic performance for the photocatalytic degradation of rhodamine B under visible-light radiation. It is proposed that the surface plasmon resonance effect arisen from Ag nanoparticles on TiO2 nanocubes can effectively enhance the visible-light driven photocatalytic properties of TiO2/Ag photocatalysts. Meanwhile, due to the etching of F ions during the synthetic process, the morphology variation of TiO2 from spherical to cubic shapes may be beneficial to the exposure of high energy {001} facets, which is liable to produce more electron–hole pairs in the photocatalytic process, and electron–hole pairs can combine with OH− to produce large amounts of hydroxyl radicals, eventually accelerating the decomposition of the organic dye.
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JOURNAL OF SOLID STATE CHEMISTRY
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2016
·
IF 2.265
Zige Zhang,Guoxiang Li,Zijian Cui,Kaiyue Zhang,Yaqing Feng,Shuxian Meng
Facilitated by TiO 2 particles adsorbing lanthanide ions in hydrosol, La-doped TiO 2 was produced by a hydrothermal method . The structure, optical and photoluminescence properties of down-converting photoelectrode with the La 3+ were characterized by X-ray (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray detector (EDX) and N 2 adsorption-desorption isotherms measurement. The photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs) fabricated with 0.05 g-La/TiO 2 reached 7.02%, which gave an efficiency improved by 10.36% compared with that of cells fabricated from pure TiO 2 . The improvement in efficiency was ascribed to more dyes adsorbed on the surface of TiO 2 .
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Ruifeng Tong,Chang Liu,Zhenkai Xu,Qin Kuang,Zhaoxiong Xie,Lansun Zheng
Integrating wide bandgap semiconductor photocatalysts with visible-light-active inorganic nanoparticles (such as Au and CdS) as sensitizers is one of the most efficient methods to improve their photocatalytic activity in the visible light region. However, as for all such composite photocatalysts, a rational design and precise control over their architecture is often required to achieve optimal performance. Herein, a new TiO2-based ternary composite photocatalyst with superior visible light activity was designed and synthesized. In this composite photocatalyst, the location of the visible light sensitizers was engineered according to the intrinsic facet-induced effect of well-faceted TiO2 nanocrystals on the spatial separation of photogenerated carriers. Experimentally, core–shell structured Au@CdS nanoparticles acting as visible light sensitizers were selectively deposited onto photoreductive {101} facets of well-faceted anatase TiO2 nanocrystals through a two-step in situ photodeposition route. Because the combination of Au@CdS and specific {101} facets of TiO2 nanocrystals facilitates the transport of charges photogenerated under visible light irradiation, this well-designed ternary composite photocatalyst exhibited superior activity in visible-light-driven photocatalytic H2 evolution, as expected.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Jingbo Yang,Hongwei Mi,Shan Luo,Yongliang Li,Peixin Zhang,Libo Deng,Lingna Sun,Xiangzhong Ren
Flexible Li-O 2 batteries have attracted worldwide research interests and been considered to be potential alternatives for the next-generation flexible devices. Nitrogen-doped carbon nanofibers (N-CNFs) prepared by electrospinning are used as flexible substrate and an amorphous TiO 2 layer is coated by atomic layer deposition (ALD) and then decorated with Ru nanoparticles . The Ru/N-CNFs@TiO 2 composite is directly used as a free-standing electrode for Li-O 2 batteries and the electrode delivers a high specific capacity, improved round-trip efficiency and good cycling ability. The superior electrochemical performance can be attributed to the amorphous TiO 2 protecting layer and superior catalytic activity of Ru nanoparticles. Based on density functional theory (DFT) calculations from first principles, the carbon electrode after coating with TiO 2 is more stable during discharge/charge process. The analysis of Li 2 O 2 on three different interfaces (Li 2 O 2 /N-CNFs, Li 2 O 2 /TiO 2 , and Li 2 O 2 /Ru) indicates that the electron transport capacity was higher on Ru and TiO 2 compared with N-CNFs, therefore, Li 2 O 2 could be formed and decomposed more easily on the Ru/N-CNFs@TiO 2 cathode. This work paves a way to develop the free-standing cathode materials for the future development of high-performance flexible energy storage systems .
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Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 4
·1672-1678
·
IF 8.262
Ying Chang,Conghui Yuan,Yuntong Li,Cheng Liu,Tong Wu,Birong Zeng,Yiting Xu,Lizong Dai
A valid pathway has been exploited to create a B,N co-doped carbon shell on the surface of TiO2 nanoparticles (TiO2@CNB) as a support of Pt nanoparticles. The shell thickness of TiO2@CNB can be easily controlled by pyrolysis of TiO2@polymer networks. The as-prepared Pt/TiO2@CNB catalyst with a thicker CNB layer of 5.0 ± 0.5 nm shows improved performance for the oxygen reduction reaction (ORR) with high onset (0.65 V) and half-wave potentials (0.56 V), which are significantly higher than those of commercial Pt/C (20 wt%) catalysts. For the methanol oxidation reaction (MOR), the Pt/TiO2@CNB catalyst with a moderate CNB layer of 3.3 ± 0.3 nm thickness demonstrates the highest activity and stability compared with that with a CNB thickness of 2.1 ± 0.3, or 5.0 ± 0.5 nm, even Pt/C. Our findings indicate that the synergy between Pt nanoparticles and the B,N co-doped carbon shell, as well as the shell thickness plays a key role in improving the electrochemical performances of the Pt/TiO2@CNB composite materials.
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JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Siyao Guo,Song Han,Haifeng Mao,Shimiao Dong,Congcong Wu,Lichao Jia,Bo Chi,Jian Pu,Jian Li
A versatile synthetic method, which is based on a low-temperature hydrothermal technique, is developed for the fabrication of a microporous ZnO/TiO 2 composite catalyst with different structures (e.g., amorphous , amorphous/crystalline and crystalline). In particular, a novel microporous ZnO/TiO 2 composite with amorphous/crystalline structure is obtained with a 3/1 M ratio of Ti/Zn. This novel ZnO/TiO 2 composite heterostructure not only has a large specific surface area (311.9 m 2 g −1 ) but also exhibits outstanding performance during solar water splitting reactions to generate hydrogen without a noble metal co-catalyst. Based on our in-depth mechanistic analysis, the synergistic effect between the amorphous ZnO and crystalline TiO 2 is responsible for the enhanced performance of this material.
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ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Xingtian Yin,Wenxiu Que,Duan Fei,Haixia Xie,Zuoli He
TiO 2 shell layer on the surface of ZnO nanowires (NWs) was synthesized by a layer by layer adsorption and reaction (LBLAR) method. Scanning electron microscopy image shows that the prepared ZnO–TiO 2 core–shell NW arrays have a similar morphology with the well-aligned ZnO core NW arrays, providing the LBLAR cycles is controlled within a certain number. The prepared ZnO–TiO 2 core–shell NW arrays were sensitized with CdS quantum dots to assemble quantum dots sensitized solar cells. Results indicate that a dramatic increase in open-circuit voltage and fill factor is achieved with an introduction of the TiO 2 shell layer with a thickness of about 7 nm, resulting in a substantial improvement of the overall energy conversion efficiency. A rapid electron transfer from the CdS QDs to the ZnO NWs and a reduced electron recombination rate due to the energy barrier occurred at the interface between the ZnO core and the TiO 2 shell are believed to contribute to the improved performance of the solar cells based on the ZnO–TiO 2 core–shell NW arrays. In addition, effects of the TiO 2 shell thickness on the performance of the as-fabricated devices are also discussed in detail.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 34
·14004-14013
·
IF 0
Wei Sun,Min Chen,Shuxue Zhou,Limin Wu
TiO2 has several important applications but its structures and morphologies are usually difficult to tune because of the uncontrollable and fast sol–gel reactions of current TiO2 precursors. This paper presents a facile and general method for the fabrication of hierarchically nanostructured TiO2 spheres with controllable morphologies based on a novel amphiphilic polymeric TiO2 precursor. By adjusting the conditions of hydrolysis and condensation reactions of this precursor, TiO2 spheres with various morphologies, including hierarchical porous, hollow, and raspberry-like structures, can be easily produced. The as-obtained spheres have hierarchical structures with specific surface areas larger than 200 m2 g−1 and mean pore sizes of several nanometers. The mechanism study indicates that the amphiphilic polymer assists the aggregation, abruption, migration, and crystallization of certain TiO2 units during hydrolysis and condensation and contributes to the formation of TiO2 spheres with various morphologies. The as-obtained specific hierarchically nanostructured TiO2 spheres exhibit a considerably higher adsorption capability for Cr(VI) anions in aqueous solution compared with the previously reported TiO2 nanomaterials, showing a high potential for heavy metal ion sequestration applications.
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RSC Advances
·
2015
·Vol. 5
·期 118
·97320-97329
·
IF 3.84
Zhenjiang Yu,Yuanyuan Zhao,Bing Gao,Xuyang Liu,Liming Jia,Fangbo Zhao,Jun Ma
To improve the anti-biofouling properties of membranes, Ag-embedded nano-sized titanium dioxide (Ag-n-TiO2) particles were utilized as biocidal agents to modify polyvinyl chloride (PVC) membranes. Both Ag-n-TiO2/PVC flat sheet membranes and reinforced hollow fiber membranes were fabricated by a phase inversion method with varying Ag-n-TiO2 particle concentrations. As a result, the hydrophilicity, permeability, and retention capability increased with Ag-n-TiO2 concentrations from 0 to 1.5 wt%. In addition, the in situ antibacterial and anti-formation of biofilm properties of the modified membranes were greatly enhanced in the conventional inhibition zone test, Escherichia coli (E. coli) absorption experiment, fluorescent staining experiment, as well as long-term continuous biofouling test. The best results were obtained for the PVC membrane modified by 1.0 wt% Ag-n-TiO2. The optimized membrane presented not only better permeability and in situ antibacterial properties in the E. coli adhesion test, but also an enhancement in resisting biofilm formation and a more steady permeation flux in long-term filtration than the unmodified membrane.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Airong Mao,Hongbo Li,Zhaosheng Cai,Xiaoya Hu
A glassy carbon electrode modified with nano TiO 2 and multi-walled carbon nanotubes composites dispersed in a novel cationic surfactant was described for the determination of trace mercury(II) by linear anodic stripping voltammetry. Under optimal experimental conditions, the linear sweep anodic stripping peak current was linear with the concentration of Hg(II) in the range of 0.1–100 μmol L −1 with a detection limit of 0.025 μmol L −1 . The sensitivity was found to be 3.7014 A/mol L −1 . The proposed electrode also showed a high selectivity for mercury in the presence of common potential interfering metal ions. Moreover, the proposed electrode revealed good reproducibility and stability. The proposed method was successfully applied for the determination of Hg(II) in river water and industrial wastewater samples.
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