作者机构：
[Tang, Y. W.; Wang, B. X.; Zhou, Y. B.; Yang, Y. Y.; Wang, J. M.; Yuan, X. B.; Chen, X.; Liu, W. P.] Cent China Normal Univ, Inst Nanosci & Technol, Wuhan 430079, Peoples R China.;[Han, H. W.; Liu, T. F.] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan Natl Lab Optoelect, Michael Gratzel Ctr Mesoscop Solar Cells, Wuhan 430074, Peoples R China.
通讯机构：
[Tang, Y. W.] C;[Han, H. W.] H;Cent China Normal Univ, Inst Nanosci & Technol, Wuhan 430079, Peoples R China.;Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan Natl Lab Optoelect, Michael Gratzel Ctr Mesoscop Solar Cells, Wuhan 430074, Peoples R China.
摘要：
A one dimensional nanostructure array has been considered as a successful charge transport material for perovskite solar cells (PSCs), because of its large internal surface area, superior charge collection efficiency and fast charge transport. Herein we demonstrate a ZnO nanorod (NR) array as the electron collector in a holeconductor- free PSC with a carbon counter electrode (CE). A relatively low initial power conversion efficiency (PCE) of 5.6% was achieved using a 1 mu m long ZnO NR array as an electron collector. However, by introduction of a thin TiO2 coating layer on the surface of ZnO via TiCl4 treatment, the PCE of the cell has been improved to the highest value of 8.24%. It is revealed that the performance enhancement of the ZnO/TiO2 NR based PSCs is largely attributed to the larger surface area, reduced electron combination, and superior electron transport properties.
作者机构：
[Tang, Y. W.; Qing, C.; Muneerah, A. A.; Wang, H.; Aref, A. A.; Sun, D. M.] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
通讯机构：
[Tang, Y. W.] C;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
摘要：
Manganese dioxide (MnO<inf>2</inf>) and CuBi<inf>2</inf>O<inf>4</inf>-doped MnO<inf>2</inf> thin films with different nanostructures were deposited on indium tin oxide (ITO) glass and Ti foil substrates by using a chemical bath deposition (CBD) technique. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron microscopy (XPS). The effects of doping and substrates on electrochemical properties of MnO<inf>2</inf>and CuBi<inf>2</inf>O<inf>4</inf>-doped MnO<inf>2</inf> thin films on ITO glass and Ti foil were investigated. Capacitive properties of MnO<inf>2</inf> and CuBi<inf>2</inf>O<inf>4</inf>-doped MnO<inf>2</inf> thin films electrodes were studied using cyclic voltammetry and electrochemical impedance spectroscopy in a three-electrode experimental setup using 0.1 M Na<inf>2</inf>SO<inf>4</inf> aqueous solution as electrolyte. Specific capacitance, obtained from electrochemical measurement for the CuBi<inf>2</inf>O<inf>4</inf>-doped MnO<inf>2</inf>, exhibited a higher value of 338 F g<sup>-1</sup> compared to the MnO<inf>2</inf> exhibiting value of 135 F g<sup>-1</sup>. In addition, CuBi<inf>2</inf>O<inf>4</inf>-doped MnO<inf>2</inf> thin films on an ITO electrode had a better and satisfactory specific capacitance value, and exhibited more excellent electrochemical stability and reversibility than Ti foil substrates.
作者机构：
[Tang, Yiwen; Wang, Bixiao; Wang, Hai; Qing, Chen; Heng, Bojun; Sun, Daming] Cent China Normal Univ, Inst Nanosci & Technol, Wuhan 430079, Peoples R China.;[Heng, Bojun] Wuhan Univ Sci & Technol, Dept Appl Phys, Wuhan 430065, Peoples R China.
通讯机构：
[Tang, Yiwen] C;Cent China Normal Univ, Inst Nanosci & Technol, Wuhan 430079, Peoples R China.
关键词：
CuO nanoarrays;Fe-incorporated CuO nanoarrays;Lithium ion full battery;Specific capacity
摘要：
CuO nanoarrays (CNAs) and Fe-incorporated CuO nanoarrays (FCNAs) were fabricated by hydrothermal method. Addition of Fe salt to the reaction mixture allowed the introduction of iron oxide onto the CNAs surface, which was characterized by XPS and HRTEM. Introducing Fe ion into reaction precursor significantly affected not only the morphologies of as-prepared products but also their electrochemical performance as anode for lithium ion full battery. The FCNAs electrodes showed higher specific capacity and better capacity retention at different current densities than that of CNAs. (C) 2015 Elsevier B.V. All rights reserved.
摘要：
NiCo2S4 and carbon-NiCo2S4 hetero-structured nanosheet arrays have been firstly synthesized on nickel foams in a facile hydrothermal and CVD method. The products NiCo2S4 and carbon-NiCo2S4 are obtained in Na2S aqueous solution in a hydrothermal reaction from precursor of NiCox(OH)(y) and carbon-NiCo2O4 through anion exchange respectively, which are characterized by XRD, TEM, Raman analysis. The obtained binary metal sulphide NiCo2S4 nanosheet delivers better electrochemical activity and higher mass loading compared with NiCo2O4. In addition, carbon introduced enhances the capacitive behaviours and cycle performance for enhanced electric conductivity and stable architecture. The integrated carbon-NiCo2S4 electrode exhibits high areal capacitance of 8.33 F cm(-2) and ultrahigh specific capacitance of 1893.2 F g(-1) with a potential window of 0.8 V and high mass loading of 4.4 mg cm(-2) and good cycle performance in a three-electrode system. The asymmetric supercapacitor is further assembled using carbon-NiCo2S4 as the positive electrode and activated carbon as the negative electrode. The integrated asymmetric supercapacitor demonstrates a high energy density of 68.82 Wh kg(-1) at a power density of 47.83 Wkg(-1), which confirms its practical applicability. (C) 2015 Elsevier Ltd. All rights reserved.
摘要：
We report a facile, rapid and low-cost two step approach to synthesize hierarchical CuO@MnO2 core–shell nanosheet arrays directly on Cu foil substrate. The as prepared CuO@MnO2 arrays can be directly used as integrated electrodes. Furthermore, the CuO@MnO2 nanosheet arrays were assembled with the commercial Li Ion Battery Cathode (LiCoO2) as a full cell, which exhibited high capacity and good cycle stability (120 mA h g−1 after 100 cycles at a rate of 150 mA g−1) and an excellent rate performance (a stable capacity of about 127 mA h g−1 after 100 cycles of variable charging rate). The excellent performance of the CuO@MnO2 hybrids comes from their intelligent integration of the two compatible components into unique hierarchical architectures with a high specific capacity. Primary single-crystalline CuO nanosheet arrays directly grown on Cu substrates allow for efficient electrical and ionic transport. The secondary MnO2 shell provide enhanced surface area and high theoretical Li+ storage capacity, and can also serve as volume spacers between neighboring CuO nanosheet arrays to maintain electrolyte penetration as well as reduce the aggregation during Li+ intercalation, thus leading to improved electrochemical energy storage performance.
作者机构：
[Tang, Yiwen; Guo, Junling; Wang, Bixiao; Wang, Hai; Qing, Chen; Sun, Daming] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Tang, Yiwen] C;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Dept Phys, Wuhan 430079, Peoples R China.
摘要：
A novel carbon-CoO-NiO-NiCo2O4 integrated electrode has been designed by reducing the hetero-structured NiCo2O4 nanosheet array with C2H2 on the nickel foam at a low temperature of 350 degrees C. The topotactical transformation from NiCo2O4 to the integrated electrode has been first conceived and investigated. Such unique nanoarchitectures exhibit excellent electrochemical performance with ultrahigh capacitance and desirable cycle life at high rates.
