【摘 要】
：
In this report,a series of self-organized TiO2 nanotube arrays were prepared by anodization of titanium foil in mixed electrolytes composed of water,ethylene glycol,and NH4F.Their photoelectrochemical(PEC) performance as a photoanode was characterized by
【机 构】
：
CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Lab
论文部分内容阅读
In this report,a series of self-organized TiO2 nanotube arrays were prepared by anodization of titanium foil in mixed electrolytes composed of water,ethylene glycol,and NH4F.Their photoelectrochemical(PEC) performance as a photoanode was characterized by the PEC water-splitting hydrogen (H2) generation reaction.The internal relationship between the TiO2 nanotube arrays (TNTAs) morphology and their PEC performance was thoroughly investigated.Our results show that when the etching time is 10 hours,the length of the as-prepared TNTAs is about 20.78 μm and the measured photocurrent density is around 1.25 mA· cm-2 with applied bias voltage 0.6 V (vs.Ag/AgCl) under simulated sunlight irradiation,which is 976 times higher than that of the TiO2 substrate without nanotubes architecture (0.00128 mA·cm-2).More interestingly,the results of the IPCE measurement show that the band-gap of the as-prepared TNTAs is reduced from 3.20 to 2.83 eV.The corresponding optical response limit is also extended from 400 nm to TiO2 nanotube arrays is 510 nm,which indicates that the increasement of the TNTAs PEC performance benefits from the great improvement of its utilization of both the UV and visible light irradiation.
其他文献
受多元谱梯度投影算法(MMSGP)的启发,对该方法进行改进,用于求解绝对值方程(AVE),在梯度差中加入松弛因子,yk-1=λ(Fk-Fk-1)+(2-λ)rsk-1并引用一种新的线搜索策略,从而实现减少迭代次数和加快收敛速度的效果,并证明了该算法在适当的假设条件下是全局收敛的.数值实验表明,改进后的算法是可行的和有效的.
气-水相对渗透率是天然气水合物现场试采的关键参数.如何测量和评估储层相对渗透率是提高产气效率、实现天然气水合物产业化需要解决的基础问题.从含水合物沉积物相对渗透率的实验测试、数值模拟和模型建立3个方面,总结了含水合物沉积物相对渗透率的研究进展,研究发现,现有含水合物沉积物实验测试大多采用非稳态法,相对渗透率曲线图显示:在同一含水饱和度下,水合物饱和度越大,水的相对渗透率越小,气的相对渗透率变化规律较为复杂;水合物饱和度的变化改变了沉积物的孔隙空间结构,进而影响气-水相对渗透率.数值模拟大多利用孔隙网络模型
With triazole-modified derivative as link,one new framework[Cd5(μ5-HL2-)2(μ4-L3-)2(H2O)10]·2H2O(1,H3L =2-(1,2,4-triazol-1-yl)benzene-l,3,5-tricarboxylic acid) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction,powder
Three zinc(Ⅱ) metal-organic frameworks (xF-MAC-3) have been synthesized by using Zn(Ⅱ) salts,3,5-dimethyl-lH-1,2,4-triazole (Hdmtrz) and different fluorination degree carboxylate ligands,which are analogic structures and can be described as (6,6)-connecte
3,4-Dichloro-5-(6-chloro-9-(4-fluorobenzyl)-9H-purin-8-yl)isothiazole,a novel purine derivative,was synthesized by the cyclization of pyrimidine amine.Its structure was characterized by 1H NMR,13C NMR,19F NMR,H RMS and single-crystal X-ray diffraction.Thi
A new 3D terbium(Ⅲ) metal-organic network[Tb(HIMDC)(HCOO)(H2O)]n (complex 1) has been synthesized by Tb3+ ions coordinated with 4,5-imidazole dicarboxylic acid (H3IMDC) and formic acid under solvothermal conditions with the mixed solvents of N,N-dimethylf
本文研究了一类生物传热方程的灌注率函数反演问题.基于附加的非局部条件和有限差分的Crank-Nicolson方法,构造了重建灌注率函数的迭代算法;经进一步简化后,得到了反演灌注率的一个显格式.为克服计算的不稳定性,引入移动平均滤波方法对误差数据进行去噪,算例结果表明结合移动平均滤波去噪的数值反演算法是可行的,能有效反演出灌注率函数.
Eighteen new acyl urea derivatives containing 2-chloronicotine moiety were synthesized using 2-chloronicotinic acid as starting material via 4 steps conveniently.These 2-chloronicotine acyl urea structures were confirmed by 1H NMR,13C NMR and HRMS.Compoun
Persistent luminescence materials (PLMs) are potential luminescent materials which can remain emitting light after stopping the excitation.PLMs can avoid the autofluorescence of biological tissues,and play an important role in biosensing,targeted imaging