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Carbon-encapsulated heazlewoodite nanoparticles as highly efficient and durable electrocatalysts for oxygen evolution reactions

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Nano Research 2017年第10期10卷 3522-3533页

作者： Mohammad Al-Mamun Huajie Yin Porun liu Xintai Su Haimin Zhang huagui Yang Dan Wang Zhiyong Tang Yun Wang Huijun Zhao Centre for Clean Environment and Energy Griffith University Gold Coast Campus QLD 4222 Austrafia Ministry Key Laboratory of Oil and Gas Fine Chemicals College of Chemistry and Chemical Engineering Xinjiang University Urumqi 830046 China Centre for Environmental and Energy Nanomaterials Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

The activity and durability of electrocatalysts are important factors in their practical applications, such as electrocatalytic oxygen evolution reactions （OERs） used in water splitting cells and metal-air batteries. In this study, a novel electrocatalyst, comprising few-layered graphitic carbon （-5 atomic layers） encapsulated heazlewoodite （Ni3S2@C） nanoparticles （NPs）, was designed and synthesized using a one-step solid phase pyrolysis method. In the OER test, the Ni3S2@C catalyst exhibited an overpotential of 298 mV at a current density of 10 mA·cm^-2, a Tafel slope of 51.3 mV·dec^-1, and charge transfer resistance of 22.0 Ω, which were better than those of benchmark RuO2 and most nickel- sulfide-based catalysts previously reported. This improved performance was ascribed to the high electronic conductivity of the graphitic carbon encapsulating layers. Moreover, the encapsulation of graphitic carbon layers provided superb stability without noticeable oxidation or depletion of Ni3S2 NPs within the nanocomposite. Therefore, the strategy introduced in this work can benefit the development of highly stable metal sulfide electrocatalysts for energy conversion and storage applications, without sacrificing electrocatalytic activity.

关键词： heazlewoodite electrocatalyst encapsulation oxygen evolution reaction pyrolysis graphitic carbon

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Fe3O4 Modified Up-Conversion Luminescent Nanocrystals for Biological Applications

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Chinese Journal of Chemistry 2012年第12期30卷 2774-2778页

作者： Hou Yu Yin Zifei Xin Hailiang Su Yonghua Yang huagui Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 China Department of Traditional Chinese Medicine Changhai Hospital The Second Military Medical University Shanghai 200433 China

Magnetic-luminescent nanocomposites have obtained a great deal of attention due to their potential applications in magnetic separation of cells, magnetic resonance imaging and luminescence imaging, and so on. Herein, a new and facile two-step synthetic strategy was developed to prepare magnetic Fe304 modified single crystalline up- conversion luminescent NaYF4： Yb3＋, Er3＋ nanocrystals using Fe304 nanoparticles as the seeds. Acting as the ＂nu- clei＂ in the reaction, the presence of Fe304 nanoparticles facilitates the formation of up-conversion NaYF4： Yb3＋, Er3＋ nanocrystals on their surfaces through heterogeneous nucleation process. The structure and properties of these multifunctional nanocrystals were characterized by transmission electron microscope （TEM）, X-ray photoelectron spectroscopy （XPS）, photo luminescence （PL） and X-ray diffraction （XRD）. The results revealed that the as-prepared multifunctional nanocrystals show dual distinct properties of up-conversion fluorescent and superpara- magnetism, which were cubic in shape and very uniform in size with an average size ranging 30m40 nm. These unique functionalities could be very attractive for biological systems, and some biological applications such as cell- labelling were also demonstrated.

关键词： up-conversion luminescent Fe3O4 modified heterogeneous nucleation biological application

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Incorporation of intra-city human mobility into urban growth simulation:A case study in Beijing

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Journal of Geographical Sciences 2022年第5期32卷 892-912页

作者： WANG Siying FEI Teng LI Weifeng ZHANG Anqi GUO huagui DU Yunyan School of Resource and Environmental Science Wuhan UniversityWuhan430079China Department of Urban Planning and Design The University of Hong KongHong KongChina Guangdong-Hong Kong-Macao Joint Laboratory for Smart Cities Hong KongChina Institute of Geographic Sciences and Natural Resources Research CASBeijing100101China School of Architecture and Urban-rural Planning Fuzhou UniversityFuzhou350108China

The effective modeling of urban growth is crucial for urban planning and analyzing the causes of land-use *** urbanization has slowed down in most megacities,improved urban growth modeling with minor changes has become a crucial open issue for these *** existing models are based on stationary factors and spatial proximity,which are unlikely to depict spatial connectivity between *** research attempts to leverage the power of real-world human mobility and consider intra-city spatial interaction as an imperative driver in the context of urban growth ***,the gravity model,which considers both the scale and distance effects of geographical locations within cities,is employed to characterize the connection between land areas using individual trajectory data from a macro *** then becomes possible to integrate human mobility factors into a neural-network-based cellular automata(ANN-CA)for urban growth modeling in Beijing from 2013 to *** results indicate that the proposed model outperforms traditional models in terms of the overall accuracy with a 0.60%improvement in Cohen’s Kappa coefficient and a 0.41%improvement in the figure of *** addition,the improvements are even more significant in districts with strong relationships with the central area of *** example,we find that the Kappa coefficients in three districts(Chaoyang,Daxing,and Shunyi)are considerably higher by more than 2.00%,suggesting the possible existence of a positive link between intense human interaction and urban *** paper provides valuable insights into how fine-grained human mobility data can be integrated into urban growth simulation,helping us to better understand the human-land relationship.

关键词： cellular automata urban growth simulation human mobility massive trajectories

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Modulating MAPbI3 perovskite solar cells by amide molecules:Crystallographic regulation and surface passivation

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Journal of Energy Chemistry 2021年第5期30卷 179-185页

作者： Jin Xie Ziren Zhou Hongwei Qiao Mengjiong Chen Lijie Wang Shuang Yang Yu Hou huagui Yang Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

A controllable crystallization is of practical importance to produce high-quality perovskite thin films with reduced structural *** bases as electron-pair donor chemicals can strongly coordinate to lead ions and have been extensively employed to manipulate the growth of perovskite *** this work,we demonstrate a series of Lewis-base amides,for morphological regulation of methylammonium lead triiodide(MAPbI3)thin *** screened acetamide was demonstrated to decently improve the grain size,along with a spatial distribution at grain boundaries(GBs).The mesostructured solar cells of acetamide-modified absorbers yielded an optimized power conversion efficiency(PCE)of 20.04%with a mitigated open-circuit voltage(V_(OC))deficit of 0.39 *** work provides a facile and cost-effective strategy toward controllable fabrication of high-performance MAPbI3 solar cells.

关键词： Amide Methylammonium lead triiodide Crystallization Solar cell

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Uniform Formation of Amorphous Cobalt Phosphate on Carbon Nanotubes for Hydrogen Evolution Reaction

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Chinese Journal of Chemistry 2021年第8期39卷 2113-2118页

作者： Mengzhan Ge Xiaodong Zhang Shangzhou Xia Wenjie Luo Yuwei Jin Qianqian Chen huagui Nie Zhi Yang Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouZhejiang 325027China AECC Hunan Aviation Powerplant Research Institute ZhuzhouHunan 412002China

Tremendous efforts have been made to the development of highly active,stable hydrogen evolution reaction(HER)electrocatalysts based on earth-abundant metal ***,cobalt phosphorus(Co-P)catalysts have received particular... 详细信息

关键词： Cobalt phosphate Heteroge neous catalysis Carb on nano tubes Electrochemistry Water splitting

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High-density oxygen-doped nano-TaN enables robust polysulfide interconversion in Li−S batteries

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Chinese Chemical Letters 2023年第8期34卷 360-364页

作者： Shuang Yu Yonggui Zhang Shuo Yang Kuikui Xiao Dong Cai huagui Nie Zhi Yang Key Laboratory of Carbon Materials of Zhejiang Province Wenzhou UniversityWenzhou 325035China College of Electrical and Electronic Engineering Wenzhou UniversityWenzhou 325035China

To tackle undesirable shuttle reaction and sluggish reaction kinetics in lithium–sulfur(Li–S)batteries,we develop a porous and high-density oxygen-doped tantalum nitride nanostructure(nano-TaNO)as an efficient catalyst through delicate *** from well-defined interior and surface nanopore channels,the nano-TaNO favors abundant sulfur storage,easy electrolyte infiltration and good electrons/Li+*** importantly,high-density O dopant in nano-TaNO not only provides high conductivity,but also promotes polysulfide adsorption/conversion via Li–O chemical interactions and the generation of S3∗−radicals to activate additional evolution path from S8 to Li_(2)***,the nano-TaNObased cathode exhibits excellent specific capacity and cyclability even under high sulfur loading *** interesting findings suggest the great potential of tantalum nitride and a high amount of anion doping engineering in manipulating intermediates and building high-performance Li−S rechargeable batteries.

关键词： Lithium−sulfur batteries Polysulfide conversion O doping TaN High-density

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Interfacial engineering in lead-free tin-based perovskite solar cells

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Journal of Energy Chemistry 2021年第6期30卷 147-168,I0005页

作者： Zhenxi Wan huagui Lai Shengqiang Ren Rui He Yiting Jiang Jincheng Luo Qiyu Chen Xia Hao Ye Wang Jingquan Zhang Lili Wu Dewei Zhao Institute of Solar Energy Materials and Devices College of Materials Science and EngineeringSichuan UniversityChengdu 610065SichuanChina Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065SichuanChina Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052HenanChina

Lead(Pb)-free Tin(Sn)-based perovskite solar cells(PSCs)have been favored by the community due to their low toxicity,preferable bandgaps,and great potential to achieve high power conversion efficiencies(PCEs).Interfaces engineering plays important roles in developing highly efficient Sn-based PSCs via passivation of trap defects,alignment of energy levels,and incorporation of low-dimensional Sn-based *** this review,we summarize the development of Pb-free Sn-based perovskites and their applications in devices,especially the strategies of improving the *** also provide perspectives for future *** aim is to help the development of new and advanced approaches to achieving high-performance environment-friendly Pb-free Sn-based PSCs.

关键词： Tin-based perovskites Perovskite solar cells Interfacial engineering Environment-friendly Energy level alignment

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Surface doping effect on the optoelectronic performance of 2D organic crystals based on cyano-substituted perylene diimides

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Chinese Chemical Letters 2024年第9期35卷 193-197页

作者： Jaeyong Ahn Zhenping Li Zhiwei Wang Ke Gao huagui Zhuo Wanuk Choi Gang Chang Xiaobo Shang Joon Hak Oh School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826South Korea State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Center for Ordered Nanoporous Materials Synthesis School of Environmental Science and EngineeringPohang University of Science and TechnologyGyeongbuk 37673South Korea Instrumental Analysis Center of Xi’an Jiaotong University Xi’an 710049China

Compared to organic thin films,organic single crystals offer significant potential in organic phototransistors(OPTs)due to their enhanced charge transport,large surface area,and defect-free ***,the development of n-type semiconductors has lagged behind p-type *** enhance semiconductor device performance,a doping process can be employed,which typically involves the introduction of charged impurities into the crystalline semiconducting *** aim is to reduce the Ohmic losses,increase carrier density,improve transport capabilities,and facilitate effective carrier injection,ultimately enhancing the electrical properties of the *** doping processes,however,often pose a risk of damaging the structure of single *** this study,we have synthesized novel cyanosubstituted chiral perylene diimides,which self-assemble into two-dimensional single crystals that can be used for n-type semiconductor *** have employed a surface doping strategy using diethylamine vapor without disrupting the crystal *** fabricated devices exhibit significantly higher charge transport properties after doping,achieving a maximum electron mobility of 0.14 cm^(2)V^(-1)s^(-1),representing an improvement of over ***,the optoelectronic performance of the doped devices has significantly improved,with the external quantum efficiency increased by over 9 times and the significantly improved response *** results suggest that our surface doping technology is a promising way for enhancing the performance of 2D organic single-crystal OPTs.

关键词： Doping effect Phototransistors Perylene diimides Organic crystals Cyano substitution

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Installation of high-valence tungsten in MIL-125(Ti) for boosted photocatalytic hydrogen evolution

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Science China Materials 2022年第5期65卷 1237-1244页

作者： Yijun Zhang Fangxin Mao Yuanwei liu Xuefeng Wu Chunfang Wen Sheng Dai Pengfei liu huagui Yang Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Institute of Fine ChemicalsSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Metal-organic frameworks(MOFs) possess the features of highly porosity-tunable and electronic-tunable structures,. Taking advantages of these merits, we successfully installed high-valence W6+ions onto the Ti-oxo clusters of MIL-125(Ti)(W-MIL-125). The installed W^(6+) ions which form a W–O–Ti structure trigger the metal-to-cluster charge transfer(MCCT), together with an enhanced light *** and spectroscopic characterizations reveal that the MCCT process optimizes the charge transfer process and efficiently separates the photogenerated electron-hole *** as-obtained sample of 3.45 W-MIL-125 with optimized electronic structure demonstrates an enhanced photocatalytic hydrogen evolution performance of 1110.7 ± 63.7 μmol g^(-1)h^(-1) under light irradiation, which is 4.0 times that of the pristine MIL-125(Ti). This work will open up a new avenue for local structural modification of MOFs to boost photocatalytic performance.

关键词： high-valence state metal-organic frameworks metal-to-cluster charge transfer photocatalytic hydrogen production

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Amorphous ferric oxide as a hole-extraction and transfer layer on nanoporous bismuth vanadate photoanode for water oxidation

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Chinese Journal of Catalysis 2017年第6期38卷 1045-1051页

作者： Ling Qian Pengfei liu Le Zhang Chongwu Wang Shuang Yang Lirong Zheng Aiping Chen huagui Yang Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

An amorphous ferric oxide layer was prepared on a bismuth vanadate *** resulted in improved charge carrier separation and surface catalytic performance compared with the photoanode without the oxide *** photocurrent of the oxide‐layer‐containing photoanode was2.52mA/cm2at1.23V versus the reversible hydrogen electrode,in potassium phosphate buffer,(0.5mol/L,pH=7.0).The amorphous ferric oxide layer on the photoanode contained low‐valence‐state iron species(FeII),which enabled efficient hole extraction and transfer.

关键词： Ferric oxide layer Amorphous Bismuth vanadate Photoanode Oxygen evolution

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