摘要：
Photoelectrocatalytic (PEC) inactivation of Escherichia coli K-12 by cuprous oxide (Cu2O) film irradiated by visible light is firstly reported. A complete inactivation of about 7 log of E. coli was obtained for Cu2O film within 6 h. The bacterial inactivation efficiency was significantly improved in a photoelectrochemical cell, in which 7 log of E. coli could be completely inactivated within 2 h by Cu2O film with a 0.1 V bias. Electric charge transfer between electrodes and E. coli, and electric charge inactivation towards E. coli were investigated using membrane-separated reactor combined with short circuit photocurrent technique. H2O2, hole, and toxicity of Cu2O film were found responsible for the inactivation of E. coli. Toxicity of copper ions (including Cu2+ and Cu+) leakage from Cu2O films was determined and the results showed that the amount of leakage copper ions was not toxic to E. coli. Finally, the Cu2O film was proved to be effective and reusable for PC and PEC inactivation of E. coli. (C) 2014 Elsevier Ltd. All rights reserved.
摘要：
MnO nanoparticles with diameter about 5 nm are uniformly dispersed within a spherical carbon matrix by an in-situ adsorption approach. This unique nanostructure with rational design and engineering not only possesses large elastic buffering space to prevent MnO nanoparticles from agglomeration, but also improves lithium-storage properties because the carbon matrix provides continuous path for Li-ion and electron diffusion inside the composite spheres. The cell assembled with the nanostructure composite exhibits high reversible specific capacity of 501 mAh/g ( exceeding pure MnO particles of 199 mAh/g) after 300 cycles at 0.5 A/g, excellent cycling stability with 81% capacity retention after 300 cycles, and enhanced rate performance up to 161 mAh/g at 5 A/g with only 13% capacity fade after 200 cycles. Due to the scale-producible fabrication steps under low temperature for this approach, the method can be used for the preparation of other nanostructures with high performance. (C) 2014 Elsevier Ltd. All rights reserved.
摘要：
Unique TiO2 nanotube arrays (TNAs) grafted with MnO2 nanosheets is synthesized for the first time as an anode for Li battery. The character of the special structure is MnO2 nanosheets grown on the outer, inner surface and tip of the TNAs. The composite combines the advantages both from MnO2 with high capacity (1230 mA h g(-1)) and TNAs with excellent cycle stability and superior electrical conductivity. Besides, the MnO2 nanosheet layer with different thickness on the surface of TNAs is fabricated through controlling hydrothermal reaction time and it is found that the thickness has a significant impact on capacity, cycle performance and conductivity. Additionally, a very abnormal phenomenon that we call "late rise of capacity" is discovered in the capacity test after several hundreds of cycle times, for which a possible mechanism is proposed according to material characterization. (C) 2015 Elsevier Ltd. All rights reserved.
作者机构：
[Liu X.; Yang X.; Lu Y.; Yan B.; Zhang Y.] Hubei Key Laboratory of Genetic Regulation and Integrative Biology College of Life Science, Central China Normal University, Wuhan, 430079, China;[Yu Y.; Hu H.; Zeng S.] Institute of Nanoscience and Nanotechnology, Central China Normal University, Wuhan, 430079, China;[Xu Yang; Xiang R.] Department of Otolaryngology, Head & Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China
通讯机构：
[Xu Yang] H;Hubei Key Laboratory of Genetic Regulation and Integrative Biology College of Life Science, Central China Normal University, Wuhan, China
关键词：
magnesium-aluminum layered double hydroxide;mouse neuroblastoma cell;oxidative stress;reactive oxygen species
作者机构：
[Li, Guojian; Zhu, Qiancheng; Hu, Hao; Yu, Ying] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
通讯机构：
[Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
摘要：
To meet the requirement of high-performance lithium ion batteries, transition metal oxides have been taken into considerable account to take the place of the commercialized anode material, graphite, which fails to reach a high capacity and satisfactory cycle life in long-term usage. In this study, TiO2 nanosheet arrays, suffering very little volume changes upon lithium ion intercalation/deintercalation, were synthesized through a facile hydrothermal method as a stable backbone for subsequent chemical bath deposition of interconnected mesoporous NiO sheets with a theoretical capacity of 718 mA h g−1, which is to offset the intrinsically low capacity of TiO2. The specific surface area for the prepared composites increased by 40.4% and the charge transfer resistance descended remarkably compared with that of pure TiO2 nanosheet arrays. The unique TiO2@NiO array structure delivered an average capacity of 420.0 mA h g−1 during 100 cycles at a constant current of 200 mA g−1. The rate performance was improved to be 199.2 mA h g−1 at 1.6 A g−1 and 278.0 mA h g−1 when back to 200 mA g−1, which is better than the pure TiO2 and NiO. A multitude of factors are responsible for the improved performance, including a larger contact surface between the electrode and electrolyte, a shorter Li ion diffusion pathway within the active material, a higher lithium storage capacity of the overall electrode plus ample open space to accommodate volume variation, which all result from the strategy of effective nanoscale structuring and surface modification. The as-designed batteries are free of binders and conductive additives, which is profitable for mass production and convenient for simplifying the manufacturing protocol.
期刊：
Journal of Physical Chemistry C,2014年118(42):24467-24478 ISSN：1932-7447
通讯作者：
Xia, Xiang-Jun
作者机构：
[Xia, Xiang-Jun; Ba, Xin; Yan, Li-Li; Huang, Sheng; Yu, Ying] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Yu, Jiaguo] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.
通讯机构：
[Xia, Xiang-Jun] C;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
How to take advantage of CO2 has been one of the main issues to be addressed around the world. Although there are many methods to convert CO2 to organic fuel, the efficiency is still not high enough for practical application. Herein, we have accomplished better conversion of CO2 by the combination of metal electrode and semiconductor thin films responsive to visible light. First, the deposition of p-type and n-type Cu2O thin films onto a Cu substrate is successfully achieved. Then, the prepared Cu/Cu2O samples are used for catalytic reduction of CO2 in photoelectrochemical systems in comparison with that in photochemical and electrochemical systems. The results show that CH4 and C2H4 are the major hydrocarbon gas products, and the prepared Cu/Cu2O samples have much higher selectivity for C2H4 formation compared with the pure Cu electrode. The best yield for CO2 reduction is obtained in the photoelectrochemical system under visible light. Additionally, CO2 conversion efficiency over the Cu/Cu2O (p-type) electrode is much higher than that over Cu/Cu2O (n-type) with similar morphology. The morphology of Cu2O has an effect on the CO2 reduction activity in the photoelectrochemical system as well. The related mechanism is discussed in detail especially for the reaction in the beginning 15 min. The study will provide us a new way to utilize solar light for efficient conversion of CO2 into organic fuel.
作者机构：
[Zhang, Lizhi; Li, Jie] Cent China Normal Univ, Coll Chem, Inst Environm Chem, Key Lab Pesticide & Chem Biol,Minist Educ, Wuhan 430079, Peoples R China.;[Li, Jie; Yu, Ying; Li, Yujie] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, Lizhi] C;Cent China Normal Univ, Coll Chem, Inst Environm Chem, Key Lab Pesticide & Chem Biol,Minist Educ, Wuhan 430079, Peoples R China.
摘要：
We prepared Bi3O4Cl single-crystalline nanosheets with high {001} facet exposure percentages and demonstrated that their photoreactivity strongly depended on the magnitude of the internal electric field (IEF), which was correlated with the {001} facet exposure percentage. More {001} facet exposure could induce the generation of stronger IEF, which favored the photogenerated charge separation and transfer, and thus enhancing the photoreactivity.
作者机构：
[Li, Guojian; Zhu, Qiancheng; Hu, Hao; Yu, Ying; Gao, Lin] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan, Peoples R China.
通讯机构：
[Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan, Peoples R China.
摘要：
Hierarchical 3D TiO2@Fe2O3 nanoframework arrays grown on a Ti substrate are synthesized via a facile hydrothermal reaction. As the synergetic effect of this hybrid material, the TiO2@Fe2O3 electrode shows superior rate capability and cycling performance to bare TiO2 and Fe2O3 electrodes.
期刊：
Journal of Physics and Chemistry of Solids,2014年75(1):86-93 ISSN：0022-3697
通讯作者：
Yu, Ying
作者机构：
[Li, Yan-Fang; Li, Xiangru; Yu, Ying; Zhang, Wen-Pei] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
通讯机构：
[Yu, Ying] C;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
关键词：
A. Semiconductors;B. Chemical method;C. Photoelectron spectroscopy;D. Surface properties
摘要：
Particular TiO2 nanoparticles with high selective photocatalytic oxidation of anionic dyes are prepared by a feasible hydrothermal method. Moreover, its photocatalytic selectivity can be easily switched to cationic dyes by a simple post-treatment in ammonia solution, which makes the prepared TiO2 have bi-directional selectivity in dye photodegradation. Based on the photocatalytic performances and the structure and surface characteristics of the catalyst, the bi-directional selectivity of the catalysts is found to be closely related to the adsorption selectivity. The adsorption selectivity originates from surface charge groups, which are introduced during the preparation and post-treatment progresses. This study provides a facile and economical approach towards selective degradation of dyes with high efficiency by the special TiO2 nanoparticles synthesized through a simple hydrothermal method, which may be used practically in the future.
期刊：
Nanomaterials for Environmental Protection,2014年:41-70
作者机构：
[Xin Ba; Wenpei Zhang; Ying Yu] Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, China;[Liangbin Xiong; Huaqing Yu] School of Physics and Electronic-Information Engineering, Hubei Engineering University, Xiaogan, China
摘要：
Cuprous oxide (Cu2O) is a typical p-type direct band-gap semiconductor with a band gap of about 2.0 eV. Due to its high solar irradiation adsorption coefficient and photoelectrohemical properties, Cu2O has been extensively investigated for application in photocatalysis for environmental pollution control. In order to overcome its shortage of low photocatalytic activity and stability, many methods such as doping, hybridization, and morphology control have been used. In this chapter, different methods to modify Cu2O are introduced. Since structure and property are relevant, the relationship between structure and photocatalytic activity for the degradation of organic pollutants, disinfection, etc., under simulated sunlight is demonstrated and summarized. The application of modified Cu2O mainly in environmental protection is also discussed. Finally, the mechanism of Cu2O as a photo-oxygen cathode in the formation of photogenerated Fenton reagents in the presence of Fe2+ is described in detail.
