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Science China Chemistry 2024年第7期67卷 2215-2223页

作者： Yanmin Zou Shiyao Li Dandan Zheng Jianyong Feng Sibo Wang yidong hou Guigang Zhang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350108China College of Environment and Safety Engineering Fuzhou UniversityFuzhou 350108China Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water ***,pristine carbon nitride prepared by traditional solid-state polymerization usually encounters issues such as rapid carrier recombination and insufficient absorption of visible light below 460 ***,poly(heptazine imide)with a distinctive nanoplate structure was synthesized in a binary molten salt of NaCl–CaCl_(2).The salt template allows the formation of the thin nanoplate structure,which promotes the charge separation and ***,the intercalation of Ca^(2+)ions between the conjugated layers endows the activation of n–π*electron transition due to the distortion of in-plane heptazine ***,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from *** work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide).

关键词： photocatalysis poly heptazine imide nanoplates ion intercalation hydrogen production

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Enhanced reflection chiroptical effect of planar anisotropic chiral metamaterials placed on the interface of two media

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Chinese Physics B 2020年第10期29卷 464-472页

作者： Xiu Yang Tao Wei Feiliang Chen Fuhua Gao Jinglei Du yidong hou College of Physics Sichuan UniversityChengdu 610065China School of Medical Information Engineering lining Medical UniversityJining 272067China Microsystem&Terahertz Research Center of CAEP China Academy of Engineering PhysicsChengdu 610299China High Energy Density Physics of the Ministry of Education Key Laboratory Sichuan UniversityChengdu 610064China

The strong chiroptical effect is highly desirable and has a wide range of applications in biosensing, chiral catalysis,polarization tuning, and chiral photo detection. In this work, we find a simple method to enhance the reflection circular dichroism(CDR) by placing the planar anisotropic chiral metamaterials(i.e., Z-shaped PACMs) on the interface of two media(i.e., Z-PCMI) with a large refractive index difference. The maximum reflection CDR from the complex system can reach about 0.840 when the refractive index is set as ntop = 4.0 and nbottom = 1.49, which is approximately three times larger than that of placing the Z-shaped PACMs directly on the substrate(i.e., Z-PCMS). While the minimum reflection CDR is 0.157 when the refractive index is set as ntop = 1.0 and nbottom = 1.49. So we can get a large available range of reflection CDR from -0.840 to -0.157. Meanwhile, the transmission CDT remains unchanged with the refractive index ntop increment. Our in-depth research indicates that the large reflection CDR is derived from the difference of non-conversion components of the planar anisotropic chiral metamaterials’ reflection matrices. In short, we provide a simple and practical method to enhance the chiroptical effect by changing the refractive index difference between two media without having to design a complex chiral structure.

关键词： chiroptical effect chiral metamaterials refractive index

Position-selected cocatalyst modification on a Z-scheme Cd_(0.5)Zn_(0.5)S/NiTiO_(3) photocatalyst for boosted H_(2) evolution

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Materials Reports(Energy) 2023年第4期3卷 52-59页

作者： Bifang Li Wenyu Guo Xue Feng Lu yidong hou Zhengxin Ding Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhouFujian350116PR China

Photocatalytic water splitting by semiconductors is a promising technology to produce clean H_(2) fuel,but the efficiency is restrained seriously by the high overpotential of the H_(2)-evolution reaction together with the high recombination rate of photoinduced *** enhance H_(2) production,it is highly desirable yet challenging to explore an efficient reductive cocatalyst and place it precisely on the right sites of the photocatalyst surface to work the proton reduction reaction ***,the metalloid NixP cocatalyst is exactly positioned on the Z-scheme Cd_(0.5)Zn_(0.5)S/NiTiO_(3)(CZS/NTO)heterostructure through a facile photodeposition strategy,which renders the cocatalyst form solely at the electron-collecting *** is revealed that the directional transfer of photoexcited electrons from Cd_(0.5)Zn_(0.5)S to Ni_(x)P suppresses the quenching of charge *** visible light,the CZS/NTO hybrid loaded with the Ni_(x)P cocatalyst exhibits an optimal H_(2) yield rate of 1103μmol h^(-1)(i.e.,27.57 mmol h^(-1)g^(-1)),which is about twofold of pristine CZS/NTO and comparable to the counterpart deposited with the Pt ***,the high apparent quantum yield(AQY)of 56%is reached at 400 ***,the mechanisms of the cocatalyst formation and the H2 generation reaction are discussed in detail.

关键词： Photocatalysis Ni_(x)P Cocatalysts Z-scheme H_(2)evolution

Synthesis and Photoluminescence Enhancement of Silver Nanoparticles Decorated Porous Anodic Alumina

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Journal of Materials Science & Technology 2011年第2期27卷 165-169页

作者： Song Ye yidong hou Renyi Zhu Shulong Gu Jingquan Wang Zhiyou Zhang Sha Shi Jinglei Du School of Physical Science and Technology Sichuan UniversityChengdu 610064China Department of Physics and Electronic Science Chaohu CollegeChaohu 238000China

Silver nanoparticles（Ag NPs） were successfully assembled in porous anodic alumina（AAO） templates via a green silver mirror *** Ag NPs/AAO composite templates then were characterized by field emission scanning electron microscopy（FESEM）,energy-dispersive X-ray microanalysis（EDX）,and X-ray diffraction（XRD）.Furthermore,the photoluminescence（PL） properties were also *** with the blank AAO,the PL intensity of Ag NPs/AAO templates are enhanced and the maximum enhancement is 2.58 *** on the local electric field enhancement effect,the theoretical values were also deduced,which are basically coincident with the experimental.

关键词： Nanocomposite Photoluminescence enhancement Local electric field enhancement

S-scheme heterojunction of crystalline carbon nitride nanosheets and ultrafine WO_(3)nanoparticles for photocatalytic CO_(2)reduction

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Journal of Environmental Sciences 2024年第6期140卷 103-112页

作者： Gongjie Chen Ziruo Zhou Bifang Li Xiahui Lin Can Yang Yuanxing Fang Wei Lin yidong hou Guigang Zhang Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFujian 350116China

Highly crystalline carbon nitride polymers have shown great opportunities in overall water photosplitting;however,their mission in light-driven CO_(2)conversion remains to be *** this work,crystalline carbon nitride(CCN)nanosheets of poly triazine imide(PTI)embedded with melon domains are fabricated by KCl/LiCl-mediated polycondensation of dicyandiamide,the surface of which is subsequently deposited with ultrafine WO_(3)nanoparticles to construct the CCN/WO_(3)heterostructure with a S-scheme *** characterizations have been conducted to reveal the compositions and structures of the S-scheme CCN/WO_(3)hybrid,featuring strengthened optical capture,enhanced CO_(2)adsorption and activation,attractive textural properties,as well as spatial separation and directed movement of light-triggered charge *** mild conditions,the CCN/WO_(3)catalyst with optimized composition displays a high photocatalytic activity for reducing CO_(2)to CO in a rate of 23.0μmol/hr(i.e.,2300μmol/(hr·g)),which is about 7-fold that of pristine CCN,along with a high CO selectivity of 90.6%against ***,it also manifests high stability and fine reusability for the CO_(2)conversion *** CO_(2)adsorption and conversion processes on the catalyst are monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS),identifying the crucial intermediates of CO_(2)^(*)-,COOH^(*)and CO^(*),which integrated with the results of performance evaluation proposes the possible CO_(2)reduction mechanism.

关键词： Crystalline carbon nitride Photocatalysis CO_(2)reduction S-scheme WO_(3)

Giant Broadband One Way Transmission Based on Directional Mie Scattering and Asymmetric Grating Diffraction Effects

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Chinese Physics Letters 2020年第4期37卷 57-61页

作者： Xuannan Wu Guanwen Yuan Rui Zhu Jicheng Wang Fuhua Gao Feiliang Chen yidong hou College of Physics Sichuan UniversityChengdu 610064 Microsystem and Terahertz Research Center China Academy of Engineering PhysicsChengdu 610299 School of Science Jiangnan UniversityWuxi 214122 Key Laboratory of High Energy Density Physics(Ministry of Education) Sichuan UniversityChengdu 610064

High performance optical diode-like devices are highly desired in future practical nano-photonic devices with strong directional *** demonstrate a kind of giant broadband reciprocity optical diode-like devices by simultaneously using the directional Mie scattering effect and the asymmetric grating diffraction *** maximum asymmetric subtraction and the asymmetric transmission ratio can reach nearly 100%and 40dB at specified wavelength,*** a wide waveband from 500nm to 800nm,the asymmetric subtraction and the ratio keep larger than 80%and 3.5 dB,respectively,even under oblique *** the best of our knowledge,this is the best one-way-transmission effect observed in the reciprocity optical diode-like *** addition,we further demonstrate that this one-way-transmission effect can bring an effective absorption enhancement on gold *** giant,broadband and angle-insensitive one-way-transmission effect demonstrated here is far beyond the well-known anti-reflection effect in the light-trapping devices and will bring new design philosophy for nano-photonic devices.

关键词： scattering effect directional

Defect and nanostructure engineering of polymeric carbon nitride for visible-light-driven CO_(2) reduction

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Chinese Journal of Structural Chemistry 2024年第3期43卷 10-18页

作者： Ziruo Zhou Wenyu Guo Tingyu Yang Dandan Zheng Yuanxing Fang Xiahui Lin yidong hou Guigang Zhang Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou350116China College of Environment and Safety Engineering Fuzhou UniversityFuzhou350108China

Sunlight-induced photocatalytic carbon dioxide(CO_(2))reduction to energy-rich chemicals by metal-free polymeric carbon nitride(CN)semiconductor is a promising tactic for sustained solar fuel ***,the reaction efficiency of CO_(2)photoreduction is restrained seriously by the rapid recombination of photogenerated carriers on CN ***,we incorporate 2-aminopyridine molecule with strong electron-withdrawing group into the skeleton edge of CN layers through a facile one-pot thermal polymerization strategy using urea as the precursor,which renders a modified carbon nitride(ACN)with extended optical harvesting,abundant nitrogen defects and ultrathin nanosheet ***,the ACN photocatalyst with desirable structural features attains enhanced separation and migration of photoexcited charge *** visible light irradiation with Co(bpy)^(2+)_(3)as a cocatalyst,the optimized ACN sample manifests a high CO_(2)deoxygnative reduction activity and high sta-bility,providing a CO yielding rate of 17μmol h^(-1),which is significantly higher than that of pristine *** key intermediates engaged in CO_(2)photoreduction reaction are determined by the in situ diffuse reflectance infrared Fourier transform spectroscopy,which sponsors the construction of the possible photocatalytic CO_(2)reduction mechanism on ACN nanosheets.

关键词： Carbon nitride Photocatalysis CO_(2)reduction Nitrogen defects Nanosheets

Salt-melt synthesis of poly(heptazine imide)in binary alkali metal bromides for enhanced visible-light photocatalytic hydrogen production

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Interdisciplinary Materials 2024年第3期3卷 389-399页

作者： Yaxuan Jin Dandan Zheng Zhongpu Fang Zhiming Pan Sibo Wang yidong hou Oleksandr Savateev Yongfan Zhang Guigang Zhang State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou UniversityFuzhouChina College of Environment and Safety Engineering Fuzhou UniversityFuzhouChina Department of Chemistry The Chinese University of Hong KongShatinNew TerritoriesHong KongChina

Poly(heptazine imide)(PHI),a semicrystalline version of carbon nitride photocatalyst based on heptazine units,has gained significant attention for solar H_(2)production benefiting from its advantages including molecular synthetic versatility,excellent physicochemical stability and suitable energy band structure to capture visible ***,PHI is obtained in saltmelt synthesis in the presence of alkali metal ***,we examined the role of binary alkali metal bromides(LiBr/NaBr)with diverse compositions and melting points to rationally modulate the polymerization process,structure,and properties of *** characterizations revealed that semicrystalline PHI with a condensedπ-conjugated system and rapid charge separation rates were obtained in the presence of LiBr/***,the apparent quantum yield of hydrogen using the optimized PHI reaches up to 62.3%at 420 *** density functional theory calculation shows that the dehydrogenation of the ethylene glycol has a lower energy barrier than the dehydrogenation of the other alcohols from the thermodynamic point of *** study holds great promise for rational modulation of the structure and properties of conjugated polymeric materials.

关键词： crystallinity hydrogen evolution photocatalysis poly(heptazine imide) salt-melt synthesis

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超高频雷达系统海面风向反演试验研究

华中科技大学学报（自然科学版） 2017年第4期45卷 102-106页

作者：文必洋李艳侯义东韩金柱武汉大学电子信息学院湖北武汉430072

将超高频雷达用于海面风向反演,基于正负一阶峰比值与风向的半经验关系提取风向,采用数字波束形成进行方位信息提取,并利用最小二乘多波束法解决风向模糊问题,雷达反演结果与浮标数据相关系数为0.85,均方根误差为25°,在小风速下,超高... 详细信息

将超高频雷达用于海面风向反演,基于正负一阶峰比值与风向的半经验关系提取风向,采用数字波束形成进行方位信息提取,并利用最小二乘多波束法解决风向模糊问题,雷达反演结果与浮标数据相关系数为0.85,均方根误差为25°,在小风速下,超高频雷达风向提取结果与浮标相关系数达0.9,误差为26°.试验结果表明利用超高频雷达监测海面风向具有可行性和有效性.

关键词：超高频雷达最小二乘法风向模糊性数字波束形成

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超高频雷达海洋表面流的探测结果与分析

电波科学学报 2016年第5期31卷 941-947页

作者：文必洋李艳侯义东杨静武汉大学电子信息学院武汉430072

近岸海域地形、海流复杂,而超高频雷达系统具有较高距离分辨率、小发射功率的特点,波长介于高频电磁波和微波之间,能同时提取海浪毛细波与重力波信息,与波浪作用比较敏感,能实现近海海洋动力参数的精细测量.不同于高频雷达回波谱,超高... 详细信息

近岸海域地形、海流复杂,而超高频雷达系统具有较高距离分辨率、小发射功率的特点,波长介于高频电磁波和微波之间,能同时提取海浪毛细波与重力波信息,与波浪作用比较敏感,能实现近海海洋动力参数的精细测量.不同于高频雷达回波谱,超高频雷达回波中一阶峰、二阶峰展宽严重并混叠在一起,难以划分一阶峰区域,因此,文中系统设计采用数字波束形成进行流速方位提取.雷达反演的流速结果与浮标数据的相关系数为0.88,但是均方根误差很大.通过分析,得出海洋表面流速不仅受到潮汐效应、地球自转的影响,当地风速在很大程度上也会影响表面流速的结论.

关键词：超高频雷达径向流速海洋回波数字波束形成风速