【摘 要】
：
The inefficient separation of photogenerated carriers has become a serious problem that limits the photoelectrochem-ical(PEC)performance of semiconductors.Herein,a sol-gel method was used to prepare BiFeO3 ferroelectric thin films with FTO and FTO/Au as s
【机 构】
：
Department of Physics,Jiangsu University,Zhenjiang 212013,China
论文部分内容阅读
The inefficient separation of photogenerated carriers has become a serious problem that limits the photoelectrochem-ical(PEC)performance of semiconductors.Herein,a sol-gel method was used to prepare BiFeO3 ferroelectric thin films with FTO and FTO/Au as substrates,respectively.The polarization electric field of the ferroelectric can more effectively separate the carriers generated in the photoelectrode.Meanwhile,the introduction of an Au buffer layer can reduce the resistance in the pro-cess of charge transfer,accelerate the carrier migration,and enhance the efficiency of the charge separation.Under light irradi-ation,Au/BiFeO3 photoelectrode exhibited an extraordinary improvement in PEC water splitting compared with BiFeO3.In addi-tion,the ferroelectric polarization electric field causes band bending,which further accelerates the separation of electrons and holes and improves the PEC performance of the photoelectrode.This work promotes the effective application of ferroelectric films in PEC water splitting.
其他文献
针对甲醇-丁酮二元共沸物难以分离的问题,以氯苯为溶剂,采用萃取精馏技术进行了流程设计和模拟计算.分别计算比较了苯甲醚、甲苯、氯苯3种萃取剂存在下甲醇-丁酮的无限稀释相对挥发度,结果表明氯苯的分离效果最优,并从剩余曲线角度分析了萃取精馏工艺的可行性.以全年总费用(TAC)为目标函数,对萃取剂用量、原料进料位置、萃取剂进料位置、总理论板数等参数进行了优化,模拟结果表明,氯苯的加入可以实现甲醇-丁酮体系的有效分离,产品纯度可达99.9％以上.从节能角度对萃取精馏工艺进行了优化,与节能前的工艺相比,设备费用增加3
Organic solar cells(OSCs)show great potential in non-grid energy supply due to its unique properties including light-weight,flexibility,semi-transparency,design flexibility,low cost and so on.Thanks to researchers\'tremendous efforts in materials develo
中国古代建筑在历代劳动人民长期努力和经验积累下,经历了从追求功能性到装饰性的转变.全国重点文保单位漳州平和城隍庙作为明代漳州宫庙建筑的代表,现存明代完整格局,其彩饰壁画色彩艳丽,题材丰富,带有浓郁的民间特色,明著名学者黄道周曾有“庙宇仑奂,甲于他邑”赞语.
In this work,we reported the room-temperature continuous-wave operation of 6.0 W GaN-based blue laser diode(LD),and its stimulated emission wavelength is around 442 nm.The GaN-based high power blue LD is grown on a c-plane GaN substrate by metal organic c
为了寻找团簇Co3FeP的稳定性、结构和内部作用力等规律,利用密度泛函理论,在B3LYP/Lanl2dz的量化水平下对团簇Co3FeP进行理论计算,得到5种优化构型,并从化学反应热力学与动力学的角度对其异构化反应中的反应物、过渡态和生成物进行了讨论分析.结果表明,所有构型均为C1对称且构型的空间结构对其熵值有影响;构型的稳定性主要由金属原子与非金属原子所决定,并且在常温常压下构型1(3)、2(3)和3(3)可以稳定存在,是大部分异构化反应的最终产物.因此,在实际材料的开发中,不仅需要注意金属原子与非金属原
Robust quantum cascade laser(QCL)enduring high temperature continuous-wave(CW)operation is of critical import-ance for some applications.We report on the realization of lattice-matched InGaAs/lnAIAs/InP QCL materials grown by metal-organic chemical vapor
为获得烟草镰刀菌根腐病拮抗真菌菌株,试验以河南省豫中烟区烟草根际土壤为试材,以主要致病菌尖孢镰刀菌Fusarium oxysporum为主要靶标,采用稀释涂布平板法分离获得土壤真菌371株,平板对峙培养法测定获得1株具有明显抑制效果的拮抗菌株,利用形态学和分子生物学的方法将其鉴定为棘孢木霉Trichoderma asperellum Tr-0111.抑制效果测定表明,该菌株对尖孢镰刀菌的抑制率最高可达93.13％,对根串珠霉菌、拟茎点霉、链格孢菌等其他8种烟草病原菌均具有较强的抑制效果.促生作用测定结果表
针对当前存在的椰衣纤维量大且难处理的问题,研究了 NaOH、KOH、Ca(OH)2和碱性H2O2(AHP)预处理对其厌氧消化性能的影响.结果表明,碱预处理可以缩短椰衣纤维厌氧消化反应的迟滞期,提高累积沼气产量.采用7％NaOH和7％AHP预处理可显著去除木质素,累积产气量(基于挥发性固体含量,VS)可达218.3 mL/g和217.8mL/g,较未预处理的椰衣纤维(累积产气量为101.1mL/g)提升了 115.9％和115.4％.
研究一类带小扰动的Raman散射的数学模型的相关问题,使用积分方程和Banach不动点定理证明初值问题的解的存在唯一,并利用多重尺度法求解渐近解,再借助积分方程和Gronwall不等式得到渐近解的余项估计,从而证明了渐近解的一致有效性.
Repressing the thermal decomposition during the process of heat treatment plays an indispensable part in the prepar-ation of perovskite films.Here,a methylammonium iodide healing method was applied to prevent the volatilization of the organ-ic component i