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Tip-induced directional charge separation on one-dimensional BiVO4 nanocones for asymmetric light absorption

Journal of Energy Chemistry 2022年第9期31卷 326-332,I0009页

作者： Nengcong Yang Ruotian Chen Chenwei Ni Dongfeng Li Qi Sun Lifang Liu Yu Qi Shengye Jin Xiuli Wang Fengtao Fan Can Li Fuxiang Zhang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsDalian National Laboratory for Clean EnergyChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

One dimensional(1D)semiconductor is a class of extensively attractive materials for many emerging solar energy conversion technologies.However,it is still of shortage to assess the impact of 1D structural symmetry on spatial charge separation and understand its underlying mechanism.Here we take controllably-synthesized 1D BiVO_(4)nanocones and nanorods as prototypes to study the influence of 1D symmetry on charge separation.It is found that the asymmetric BiVO_(4)nanocones enable more effective charge separation compared with the symmetric nanorods.The unexpected spatial charge separation on the nanocones is mainly ascribed to uneven light absorption induced diffusion-controllable charge separation due to symmetry breaking of 1D nanostructure,as evidenced by spatial and temporal resolved spectroscopy.Moreover,the promotion effect of charge separation on the nanocones was quantitatively evaluated to be over 20 times higher than that in BiVO_(4)nanorods.This work gives the first demonstration of the influence of 1D structural symmetry on the charge separation behavior,providing new insights to design and fabricate semiconductor materials for efficient solar energy conversion.

关键词： Charge separation Tip-enhanced light absorption Surface photovoltage BiVO4 Photocatalysis

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Probing of coupling effect induced plasmonic charge accumulation for water oxidation

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National Science Review 2021年第6期8卷 160-168页

作者： Yuying Gao Feng Cheng Weina Fang Xiaoguo Liu Shengyang Wang Wei Nie Ruotian Chen Sheng Ye Jian Zhu Hongyu An Chunhai Fan Fengtao Fan Can Li State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyCollaborative Innovation Center of Chemistry for Energy Materials (i Ch EM)Dalian Institute of Chemical PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences School of Chemistry and Chemical Engineering and Institute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong University

A key issue for redox reactions in plasmon-induced photocatalysis, particularly for water oxidation, is the concentration of surface-accumulating charges(electrons or holes) at a reaction site for artificial photosynthesis. However, where plasmonic charge accumulated at a catalyst’s surface, and how to improve local charge density at active sites, remains unknown because it is difficult to identify the exact spatial location and local density of the plasmon-induced charge, particularly with regard to holes. Herein, we show that at the single particle level, plasmon-coupling-induced holes can be greatly accumulated at the plasmonic Au nanoparticle dimer/Ti O2 interface in the nanogap region, as directly evidenced by the locally enhanced Surface photovoltage. Such an accumulation of plasmonic holes can significantly accelerate the water oxidation reaction(multi-holes involved) at the interfacial reaction site, with nearly one order of magnitude enhancement in photocatalytic activities compared to those of highly dispersed Au nanoparticles on Ti O2. Combining Kelvin probe force microscopy and theoretical simulation, we further clarified that the local accumulated hole density is proportional to the square of the local near-field enhancement. Our findings advance the understanding of how charges spatially distribute in plasmonic systems and the specific role that local charge density at reaction sites plays in plasmonic photocatalysis.

关键词： plasmonic photocatalysis coupling effect charge separation Surface photovoltage spatial distribution

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Synthesis and photoelectrical performance of nanoscale PbS and Bi2S3 co-sensitized on TiO2 nanotube arrays

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Journal of Modern Transportation 2017年第1期25卷 52-57页

作者： Fanggong Cai Min Pan Yong Feng Guo Yan Yong Zhang Yong Zhao Superconductivity and New Energy R&D Center Key Laboratory of Advanced Technology of Materials(Ministryof Education of China)Southwest Jiaotong UniversityMail Stop 165#Cheng du 610031People's Republic of China National Engineering Labortary for Superconducting Materials Western Superconducting Technologies Co.LtdXi'anPeople's Republic of China School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031People's Republic of China

TiO2 films have been widely applied in photo- voltaic conversion techniques. TiO2 nanotube arrays （TiO2 NAs） can be grown directly on the surface of metal Ti by the anodic oxidation method. Bi2S3 and PbS nanoparticles （NPs） were firstly co-sensitized on TiOa NAs （denoted as PbS/Bi2S3（n）/TiO2 NAs） by a two-step process containing hydrothermal and sonication-assisted SILAR method. When the concentration of Bi3＋ is 5 mmol/L, the best photoelectrical performance was obtained under simulated solar irradiation. The short-circuit photocurrent （Jsc） and photoconversion efficiency （η） of PbS/Bi2S3（5）/TiO2 NAs electrode were 4.70 mA/cm and 1.13 %, respectively.

关键词： Solar cells TiO2 nanotube arrays Bi2S3 PbS Surface photovoltage

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Comparative research on the transmission-mode GaAs photocathodes of exponential-doping structures

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Chinese Physics B 2012年第3期21卷 268-274页

作者：陈亮钱芸生张益军常本康 Institute of Optoelectronics Technology China Jiliang University Institute of Electronic Engineering & Optoelectronics Technology Nanjing University of Science and Technology

Early research has shown that the varied doping structures of the active layer of GaAs photocathodes have been proven to have a higher quantum efficiency than uniform doping structures. On the basis of our early research on the Surface photovoltage of GaAs photocathodes, and comparative research before and after activation of reflection-mode GaAs photocathodes, we further the comparative research on transmission-mode GaAs photocathodes. An exponential doping structure is the typical varied doping structure that can form a uniform electric field in the active layer. By solving the one-dimensional diffusion equation for no equilibrium minority carriers of transmission-mode GaAs photocathodes of the exponential doping structure, we can obtain the equations for the Surface photovoltage （SPV） curve before activation and the spectral response curve （SRC） after activation. Through experiments and fitting calculations for the designed material, the body-material parameters can be well fitted by the SPV before activation, and proven by the fitting calculation for SRC after activation. Through the comparative research before and after activation, the average surface escape probability （SEP） can also be well fitted. This comparative research method can measure the body parameters and the value of SEP for the transmission-mode GaAs photocathode more exactly than the early method, which only measures the body parameters by SRC after activation. It can also help us to deeply study and exactly measure the parameters of the varied doping structures for transmission-mode GaAs photocathodes, and optimize the Cs-O activation technique in the future.

关键词： GaAs photocathode Surface photovoltage electron diffusion length surface escape prob- ability

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Highly sensitive room-temperature gas sensors based on hydrothermal synthesis of Cr_2O_3 hollow nanospheres

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Chinese Physics B 2009年第9期18卷 3985-3989页

作者：李盛李凤丽周少敏王鹏程轲杜祖亮 Key Lab for Special Functional Materials of Ministry of Education Henan University

This paper reports that Cr2O3 hollow nanospheres （HNs） were synthesized via a hydrothermal approach and characterized by scanning electron microscopy, x-ray powder diffraction, transmission electron microscopy （TEM）, selective area electron diffraction and high resolution TEM, respectively. In addition, the room-temperature （RT） gas sensing properties of Cr2O3 HNs and conventional powders （CPs） were investigated by means of the Surface photovoltage technique. The experimental data demonstrate that the RT gas sensor of the as-fabricated HNs reaches below 5 ppm whereas that of the CPs is about 40 ppm, which results from there being much more adsorbed and desorbed oxygen in HNs than in CPs at RT. The as-prepared Cr2O3 HNs could have potential applications as RT nanosensors.

关键词： Cr2O3 hollow nanospheres gas sensing Surface photovoltage

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The photovoltage-gas Sensitive Properties of 7,7,8,8-Tetracyanoquinodimethane(TCNQ)

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Chemical Research in Chinese Universities 1990年第4期6卷 341-345页

作者： Jiang Lei, Wang Dejun, Liu Wang, Chai Xiangdong and Li Tiejin (Department of Chemistry, Jilin University, Changchun)

In this paper, Surface photovoltage technique (SPV) was applied to the study of photovoltaic and gas sensitive properties of TCNQ polycrystal. It was found that SPV shows two peaks at 390 nm(P1) and 480 nm (P2) in the ultraviolet-visible range. And they are opposite in phase. The results of gaseous adsorption confirm that P, shows the acceptor characteristics, while PI shows that of donor. During adsorption, donor gas interacts with conjugated II * orbital, acceptor gas with the terminal group C=N .

关键词： Surface photovoltage Gas sensitivity Adsorption

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