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In situ construction of porous hierarchical(Ni3-xFex)FeN/Ni heterojunctions toward efficient electrocatalytic oxygen evolution

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Nano Research 2020年第2期13卷 328-334页

作者： Minglei Yan Kun Mao Peixin Cui Chi Chen Jie Zhao Xizhang Wang Lijun Yang Hui Yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory of Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

As a choke point in water electrolysis,the oxygen evolution reaction(OER)suffers from the severe electrode polarization and large ***,the porous hierarchical hetero-(Nis Fe)FeN/Ni catalysts are in situ constructed for the eficient electrocatalytic OER.X-ray absorption fine structure characterizations reveal the strong Ni-Fe bimetallic interaction in(Niz Fex)FeN/*** study indicates the heterojunction and bimetallic interaction decrease the free-energy change for the rate-limiting step of the OER and the overpotential *** addition,the high conductivity and porous hierarchical morphology favor the electron transfer,electrolyte access and O2 ***,the optimized catalyst achieves a low overpotential of 223 mV at 10 ***^-2,a small Tafel slope of 68 mV:dec^-1,and a high *** excellent performance of the optimized catalyst is also demonstrated by the overall water electrolysis with a low working voltage and high Faradaic ***,the correlation between the structure and performance is well established by the experimental characterizations and theoretical calculations,which confirms the origin of the OER activity from the surface metal oxyhydroxide in situ generated upon applying the *** study suggests a promising approach to the advanced OER electrocatalysts for practical applications by constructing the porous hierarchical metal-compound/metal heterojunctions.

关键词： oxygen evolution reaction electrocatalysts ternary Ni-Fe nitrides heterojunctions /n s/fty construction

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Air-condition process for scalable fabrication of CdS/ZnS 1D/2D heterojunctions toward efficient and stable photocatalytic hydrogen production

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Carbon Energy 2023年第7期5卷 1-14页

作者： Dongdong Zhang Jie Teng Hongli Yang Zhi Fang Kai Song Lin Wang Huilin Hou Xianlu Lu Chris RBowen Weiyou Yang College of Materials Science and Engineering Hunan UniversityChangshaPeople's Republic of China Institute of Micro/Nano Materials and Devices Ningbo University of TechnologyNingboZhejiangPeople's Republic of China Department of Mechanical Engineering University of BathBathUK

We report the scalable fabrication of CdS/ZnS 1D/2D heterojunctions under ambient air conditions(i.e.,room temperature and atmospheric pressure)in which ZnS nanoparticles are anchored on the surface of CdS *** as-formed heterojunctions exhibit a significantly enhanced photocatalytic H_(2) evolution rate of 14.02 mmol h^(-1) g^(-1) when irradiated with visible light,which is~10 and 85 times higher than those of pristine CdS nanosheets and CdS nanoparticles,respectively,and superior to most of the CdS-based photocatalysts reported to ***,they provide robust photocatalytic performance with demonstratable stability over 58 h,indicating their potential for practical *** formation of 1D/2D heterojunctions not only provides improved exposed active sites that respond to illumination but also provides a rapid pathway to generate photogenerated carriers for efficient separation and transfer through the matrix of single-crystalline CdS *** addition,first-principles simulations demonstrate that the existence of rich Zn vacancies increases the energy level of the ZnS valence band maximum to construct type-II and Z-scheme mixed heterojunctions,which plays a critical role in suppressing the recombination of carriers with limited photocorrosion of CdS to enhance photocatalytic behavior.

关键词： air condition CdS heterojunctions photocatalytic hydrogen production ZnS

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Combination Mechanism and Enhanced Visible-Light Photocatalytic Activity and Stability of CdS/g-C3N4 heterojunctions

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Journal of Materials Science & Technology 2017年第1期33卷 30-38页

作者： Huanyan Xu Licheng Wu Liguo Jin Kejia Wu School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

In this study, CdS/g-C3N4 （CSCN） heterojunctions were in situ fabricated with a large amount of CdS nanoparticles anchored on g-C3N4 nanosheets, A wet chemical method was developed for the first time to determine the actual content of CdS in CSCN composites. X-ray diffraction （XRD）, Fourier transform infrared spectra （FFIR）, high-resolution transmission electron microscopy （HRTEM） and UV-vis diffuse reflectance spectra （DRS） were employed to characterize the composition, structure and optical prop- erty of CSCN composites. Based on the is0electric point （liP） analysis of g-C3N4, a conclusion was obtained on the combination mechanism between CdS nanoparticles and g-C3N4 nanosheets. The photocatalytic activity of CSCN composites was much better than those of individual CdS and g-C3N4 for the degrada- tion of azo dye Methyl Orange （MO） by 40 min adsorption in the dark followed by 15 min photocatalysis under visible light irradiation. After 5 cycles, CSCN composites still maintained high reactive activity with the MO degradation efficiency of 93.8%, exhibiting good photocatalytic stability. The Cd2~ concentration dissolved in the supernatant detected by atomic absorption spectroscopy （AAS） of CSCN composites was lower than that of pure CdS, implying that the photocorrosion of CdS could be suppressed via the combination with g-C3N4. Photoluminescence emission spectra （PL） results clearly revealed that the recombination of photogenerated electron-hole pairs in CSCN composites was effectively inhibited due to the formation of heterojunctions. Based on the band alignments of g-C3N4 and CdS, the possible photocatalvtic mechnism was discussed.

关键词： CdS/g-C3N4 heterojunctions Photocatalytic stability Photocatalytic mechanism

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Interface engineering of ZnSnO_(3)-based heterojunctions for room-temperature methanol monitoring

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Rare Metals 2023年第12期42卷 4153-4166页

作者： Jin-Yong Xu Kai-Chun Xu Xiao-Xi He Han-Lin Liao Marc Debliquy Qiao-Quan Liu Chao Zhang College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComteUTBMBelfort 90010France Service de Science des Matériaux Faculte PolytechniqueUniversitéde MonsMons 7000Belgium College of Agriculture Yangzhou UniversityYangzhou 225009China

Detecting methanol is of great importance in the organic synthesis ***,the effective utilization of ZnSnO_(3)-based microstructures for room-temperature methanol monitoring was realized through a template-free ***_(3)-based heterojunctions with different structures and morphologies were successfully synthesized via regulating the molar ratio of Zn2+and Sn4+*** room-temperature sensing properties towards methanol were *** them,ZnO/ZnSnO_(3) hollow microcubes exhibited an outstanding sensing performance including a high sensitivity(10.16)and a response/recovery time(14/75 s)and a limit of detection(490×10^(-9))towards 5×10^(-6)***,the synergistic effects of hollow structure with larger specific surface areas(42.277 m^(2)·g^(-1)),the construction of n-n heterojunctions formed at ZnSnO_(3) and ZnO interfaces,the high percentage of dissociative and chemisorbed oxygen are the main causes of the elevated sensing ***,the practical experiment demonstrated that ZnO/ZnSnO_(3) was capable of on-field monitoring methanol in the chemical reaction utilizing H_(2) and CO_(2) as raw ***,with the help of density functional theory calculations,the enhanced sensing properties of ZnO/ZnSnO_(3) are due to the special tuning effects of Zn ionic sites on methanol adsorption.

关键词： ZnSnO_(3) heterojunctions Methanol Gas sensor Density functional theory calculations

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Di-defects synergy boost electrocatalysis hydrogen evolution over two-dimensional heterojunctions

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Nano Research 2022年第1期15卷 677-684页

作者： Yan Cui Xiaoyu Guo Jian Zhang Xing’ao Li Xinbao Zhu Wei Huang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China New Energy Technology Engineering Lab of Jiangsu Province School of ScienceNanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials(LAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037China Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)}127 West Youyi RoadXian 710072China

Electronic modulation on the inert basal plane of transition-metal dichalcogenides(TMDs)through vacancy defect excitation,although extremely challenging,is urgent for understanding the factors that impact the hydrogen evolution reaction(HER)catalytic ***,ultrathin WS2 nanosheets with precise quantitative single atomic S-vacancy on the inert basal plane were flexible prepared through hydrogen peroxide etching *** as-synthesized single atomic S-vacancy defect WS2(SVD-WS2)nanoflake with the activated basal plane exhibited an impressive overpotential of 137 mV at a current density of 10 mA·cm^(-2) and a Tafel slope of 53.9 mV dec^(-1).Furthermore,anchoring on the defect graphene matrix,the assembled two-dimensional(2D)stacking heterojunction exhibits further enhanced HER catalytic activity(an overpotential of 108 mV vs.10 mA·cm^(-2) and a Tafel slope of 48.3 mV·dec^(-1))and stability(〜10%decline after 9,000 cycles),which attributed to the electronic structure modulation from the synergetic interactions between SVD-WS_(2) and defect *** finding provides a smart defects introduce strategy to trigger high-efficiency hydrogen evolution over WS_(2) nanosheets and a general 2D heterojunctions fabricated inspiration based on strong interaction interface.

关键词： S-vacancies defect graphene hydrogen evolution reaction heterojunctions

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Construction of hierarchical FeNi_(3)@(Fe,Ni)S_(2) core-shell heterojunctions for advanced oxygen evolution

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Nano Research 2021年第11期14卷 4220-4226页

作者： Minglei Yan Zhiyang Zhao Peixin Cui Kun Mao Chi Chen Xizhang Wang Qiang Wu Hui Yang Lijun Yang Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory of Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Sciencethe Chinese Academy of SciencesNanjing210008China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China

The investigation of earth-abundant electrocatalysts for efficient water electrolysis is of central importance in renewable energy system, which is currently impeded by the large overpotential of oxygen evolution reaction (OER). NiFe sulfides show promising OER activity but are troubled by their low intrinsic conductivities. Herein, we demonstrate the construction of the porous core-shell heterojunctions of FeNi3@(Fe,Ni)S_(2) with tunable shell thickness via the reduction of hierarchical NiFe(OH)x nanosheets followed by a partial sulfidization. The conductive FeNi3 core provides the highway for electron transport, and the (Fe,Ni)S_(2) shell offers the exposed surface for in situ generation of S-doped NiFe-oxyhydroxides with high intrinsic OER activity, which is supported by the combined experimental and theoretical studies. In addition, the porous hierarchical morphology favors the electrolyte access and O_(2) liberation. Consequently, the optimized catalyst achieves an excellent OER performance with a low overpotential of 288 mV at 100 mA·cm^(−2), a small Tafel slope of 48 mV·dec^(−1), and a high OER durability for at least 1,200 h at 200 mA·cm^(−2). This study provides an effective way to explore the advanced earth-abundant OER electrocatalysts by constructing the heterojunctions between metal and corresponding metal-compounds via the convenient post treatment, such as nitridation and sulfidization.

关键词： oxygen evolution reaction electrocatalysts Ni-Fe nitrides core-shell structure heterojunctions

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Realization of vertical and lateral van der Waals heterojunctions using two-dimensional layered organic semiconductors

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Nano Research 2017年第4期10卷 1336-1344页

作者： Yuhan Zhang Zhongzhong Luo Fengrui Hu Haiyan Nan Xiaoyong Wang Zhenhua Ni Jianbin Xu Yi Shi Xinran Wang National Laboratory of Solid State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Cen ter of Advanced Microstructures Nanjing University Nanjing 210093 China School of Physics Nanjing University Nanjing 210093 China Department of Physics Southeast University Nanjing 211189 China Department of Electronic Engineering and Materials Science and Technology Research Center The Chinese University ofHong Kong Hong Kong SAR China

Van der Waals （vdW） heterojunctions based on two-dimensional （2D） atomic crystals have been extensively studied in recent years. Herein, we show that both vertical and lateral vdW heterojunctions can be realized with layered molecular crystals using a two-step physical vapor transport （PVT） process. Both types of heterojunctions show clean and sharp interfaces without phase mixing under atomic force microscopy （AFM）. They also exhibit a strong interfacial built-in electric field similar to that of their inorganic counterparts. These heterojunctions have greater potential for device applications than individual materials. The lateral heterojunction （LHJ） devices show rectifying characteristics due to the asymmetric energy barrier for holes at the interface, while the vertical heterojunction （VHJ） devices behave like metal-insulator-semiconductor tunnel junctions, with pronounced negative differential conductance （NDC）. Our work extends the concept of vdW heterojunctions to molecular materials, which can be generalized to other layered organic semiconductors （OSCs） to obtain new device functionalities.

关键词： two-dimensional heterojunctions organic semiconductor van der Waals epitaxy

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Lignin-based electrospun nanofiber membrane decorated with photo-Fenton Ag@MIF-100(Fe) heterojunctions for complex wastewater remediation

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 930-941页

作者： Guodong Tian Chao Duan Bingxu Zhou Chaochao Tian Qiang Wang Jiachuan Chen State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Membrane technology for wastewater remediation has aroused wide interest owing to its unique properties and potential ***,it remains challenging to explore green,efficient and robust membrane material and technique for complex wastewater ***,we proposed using a simple electrospinning and in situ seeding method to fabricate a lignin-based electrospun nanofiber membrane(LENM)decorated with photo-Fenton Ag@MIL-100(Fe)heterojunctions for efficient separation of oil/water emulsions and degradation of organic *** to the embedded lignin in LENM,an ultrahigh MIL-100(Fe)loading(53 wt%)with good wettability and high porosity was *** a result,the hybrid Ag@MIL-100(Fe)/LENM exhibited excellent oil/water emulsions separation efficiency(more than 97%)without a compromise of water ***,the hybrid membrane showed an excellent dye removal with degradation of 99%methylene blue within 30 min under illumination,which is attributed to a synergy of dye adsorption/enrichment and photo-Fenton catalytic degradation from Ag@MIL-100(Fe).Therefore,the lignin-based photo-Fenton hybrid membrane can lay the foundation for the preparation and application of green,sustainable and versatile membrane materials and technologies for efficient complex wastewater remediation.

关键词： lignin electrospinning heterojunctions photo-Fenton catalysis wastewater remediation

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Fabrication of double-walled carbon nanotube film/TiO_2 nanotube array heterojunctions with length-dependent photoresponse for broad band photodetectors

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International Journal of Minerals,Metallurgy and Materials 2013年第3期20卷 307-312页

作者： Ming-jie Yang Wei Liu Jia-lin Sun Jin-quan Wei Jia-lin Zhu Laboratory of Advanced Materials Department of Material Science and Engineering Tsinghua University State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Key Laboratory for Advanced Materials Processing Technology of Education Ministry Department of Mechanical Engineering Tsinghua University

A novel photodetector based on double-walled carbon nanotube （DWCNT） film/TiO2 nanotube array （TNA） heterojunctions was fabricated, which exhibited high photoresponse in a broad spectral range. The photoresponse of the detector was dramatically dependent on the length of the TNAs. High photocurrent-to-dark current ratio with a value of 3360 was observed in the visible range by optimizing the lengths of the TNAs. The photosensitive regions could be extended into the near-infrared range. These results reveal that DWCNT film/TNA heterojunctions show potential applications for broad band photodetectors.

关键词： photodetectors titanium dioxide carbon nanotubes heterojunctions

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Chemical vapor deposition growth of two-dimensional heterojunctions

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Science China(Physics,Mechanics & Astronomy) 2018年第1期61卷 2-18页

作者： Yu Cui Bo Li JingBo Li ZhongMing Wei State Key LaboratoO' of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences & College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beij'ing 100083 China

The properties of two-dimensional(2 D) layered materials with atom-smooth surface and special interlayer van der Waals coupling are different from those of traditional materials. Due to the absence of dangling bonds from the clean surface of 2 D layered materials, the lattice mismatch influences slightly on the growth of 2 D heterojunctions, thus providing a flexible design strategy.2 D heterojunctions have attracted extensive attention because of their excellent performance in optoelectronics, spintronics, and valleytronics. The transfer method was utilized for the fabrication of 2 D heterojunctions during the early stage of fundamental research on these materials. This method, however, has limited practical applications. Therefore, chemical vapor deposition(CVD) method was recently developed and applied for the preparation of 2 D heterojunctions. The CVD method is a naturally down-top growth strategy that yields 2 D heterojunctions with sharp interfaces. Moreover, this method effectively reduces the introduction of contaminants to the fabricated heterojunctions. Nevertheless, the CVD-growth method is sensitive to variations in growth conditions. In this review article, we attempt to provide a comprehensive overview of the influence of growth conditions on the fabrication of 2 D heterojunctions through the direct CVD method. We believe that elucidating the effects of growth conditions on the CVD method is necessary to help control and improve the efficiency of the large-scale fabrication of 2 D heterojunctions for future applications in integrated circuits.

关键词： two-dimensional materials heterojunctions chemical vapor deposition

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