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Efficient sequential harvesting of solar light by heterogeneous hollow shells with hierarchical pores

National Science Review 2020年第11期7卷 1638-1646页

作者： Yanze Wei Jiawei Wan Nailiang Yang Yu Yang Yanwen Ma Songcan Wang Jiangyan Wang Ranbo Yu Lin Gu Lianhui Wang Lianzhou Wang Wei Huang Dan Wang State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing University of Chinese Academy of Sciences Chinese Academy of Sciences School of Materials Science and Engineering Nanjing University of Posts and Telecommunications School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of Queensland Department of Materials Science andEngineering Stanford University Institute of Physics Chinese Academy of Sciences

In nature, sequential harvesting of light widely exists in the old life entity, i.e. cyanobacteria, to maximize the light absorption and enhance the photosynthesis efficiency. Inspired by nature, we propose a brand new concept of temporally-spatially sequential harvesting of light in one single particle, which has purpose-designed heterogeneous hollow multi-shelled structures (HoMSs) with porous shells composed of nanoparticle subunits. Structurally, Ho MSs consist of different band-gap materials outside-in, thus realizing the efficient harvesting of light with different wavelengths. Moreover, introducing oxygen vacancies into each nanoparticle subunit can also enhance the light absorption. With the benefit of sequential harvesting of light in Ho MSs, the quantum efficiency at wavelength of 400 nm is enhanced by six times compared with the corresponding nanoparticles. Impressively, using these aforementioned materials as photocatalysts,highly efficient photocatalytic water splitting is realized, which cannot be achieved by using the nanoparticle counterparts. This new concept of temporally-spatially sequential harvesting of solar light paves the way for solving the ever-growing energy demand.

关键词： light harvesting hollow structures multi-shelled solar energy conversion

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Direct synthesis of hollow polyhedral ceria nano powders via a template-free mixed solvothermal route

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Journal of Rare Earths 2015年第8期33卷 892-897页

作者：刘俊亮颜雷鸣陈秀雷王绳芸张明田长安 School of Chemistry and Chemical Engineering Yangzhou University Key Laboratory of Environmental Materials and Engineering of Jiangsu Province Testing Center Yangzhou University Department of Chemistry and Materials Engineering Hefei University

Novel mono-dispersed hollow polyhedral ceria nano powders with the average particle size of 250 nm were directly synthesized via a simple template-free mixed solvothermal method by using water-ethanol as the solvent. The formation of such hollow structure with the regular polyhedral particle shape was based on a solvent-controlled Ostwald ripening coupled self-templating process. The mixed solvent promoted the formation of the regular solid particles at the beginning of solvothermal reaction and drove the Ostwald ripening as the reaction went on. Owing to the Ostwald ripening and self-assembly of nano crystallites, ceria nano particles converted into the hollow structures with regular polyhedral shape during the solvothermal process just by increasing solvothermal reaction time. The as-synthesized hollow ceria nano powders exhibited strong absorptions in the UV-vis spectrum and the evaluated energy band gaps increased according to the shape evolution and size decrease of the nano particles, which demonstrated obvious blue shift effects.

关键词： ceria hollow structures nano powders solvothermal reaction rare earths

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Robust S-doped TiO_(2)@N,S-codoped carbon nanotube arrays as free-binder anodes for efficient sodium storage

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Journal of Energy Chemistry 2021年第2期30卷 175-184,I0007页

作者： Guangzeng Liu Man Huang Zhengchunyu Zhang Baojuan Xi Haibo Li Shenglin Xiong School of Chemistry and Chemistry Engineering Qilu Normal UniversityJinan 250200ShandongChina Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical Engineeringand State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100ShandongChina School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng 252059ShandongChina

Titanium dioxide(TiO_2) has been investigated broadly as a stable,safe,and cheap anode material for sodium-ion batteries in recent ***,the poor electronic conductivity and inherent sluggish sodium ion diffusion hinder its practical ***,a self-template and in situ vulcanization strategy is developed to synthesize self-supported hybrid nanotube arrays composed of nitrogen/sulfur-codoped carbon coated sulfur-doped TiO_2 nanotubes(S-TiO_2@NS-C) starting from H_2 Ti_2 O_5-H_2 O *** S-TiO_2@NS-C composite with one-dimensional nano-sized subunits integrates several ***,sulfur doping strongly improves the Na~+ storage ability of TiO_2@C-N nanotubes by narrowing the bandgap of original TiO_*** from the nanoarrays structures built from hollow nanotubes,carbon layer and sulfur doping,the sluggish Na~+ insertion/extraction kinetics is effectively improved and the volume variation of the electrode material is significantly *** a result,the S-TiO_2@NS-C nanoarrays present efficient sodium storage *** greatly improved sodium storage performances of S-TiO_2@NS-C nanoarrays confirm the importance of rational engineering and synthesis of hollow array architectures with higher complexity.

关键词： hollow structures Nanotube arrays S-doped TiO_(2) N S-codoped carbon Sodium-ion batteries

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Confined nanospace pyrolysis: A versatile strategy to create hollow structured porous carbons

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Nano Research 2021年第9期14卷 3159-3173页

作者： Rui-Ping Zhang Wen-Cui Li Guang-Ping Hao An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China

Confined nanospace pyrolysis(CNP)has attracted increasing attention as a general strategy to prepare task-specific hollow structured porous carbons(HSPCs)in the past *** unique advantages of the CNP strategy include its outstanding ability in control of the monodispersity,porosity and internal cavity of *** a consequence,the obtained HSPCs perform exceptionally well in applications where a high dispersibility and tailored cavity are particularly required,such as drug delivery,energy storage,catalysis and so *** this review,the fundamentals of the CNP strategy and its advances in structural alternation is first summarized,then typical applications are discussed by exemplifying specific synthesis *** addition,this review offers insights into future developments for advanced task-specific hollow structured porous materials prepared by the CNP strategy.

关键词： confined nanospace pyrolysis hollow structures carbon materials core-shell structures dispersibility

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Solution-phase synthesis of inorganic nanostructures by chemical transformation from reactive templates

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Science China Chemistry 2010年第2期53卷 365-371页

作者： HUANG Teng QI LiMin Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of ChemistryPeking UniversityBeijing 100871China

The solution-phase synthesis by chemical transformation from reactive templates has proved to be very effective in morphology-controlled synthesis of inorganic nanostructures. This review paper summarizes the recent progress in solution-phase synthesis of one-dimensional and hollow inorganic nanostructures via reactive templates, focusing on the approaches developed in our lab. The formation mechanisms based on reactive templates are discussed in depth to show the general concepts for the preparation processes. An outlook on the future development in this area is also presented.

关键词： reactive template morphology-controlled synthesis nanostructures one-dimensional structures hollow structures

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Construction of hollow binary oxide heterostructures by Ostwald ripening for superior photoelectrochemical removal of reactive brilliant blue KNR dye

Advanced Powder Materials

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Advanced Powder Materials 2023年第3期2卷 36-44页

作者： Hongchao Ma Fanyue Zhao Ming Li Pengyuan Wang Yinghuan Fu Guowen Wang Xinghui Liu School of Light Industry&Chemical Engineering Dalian Polytechnic UniversityDalian116034China Department of Materials Physics Saveetha School of EngineeringSaveetha Institute of Medical and Technical Sciences(SIMTS)ThandalamChennai602105TamilnaduIndia Department of Chemistry Sungkyunkwan University(SKKU)Jangan-GuSuwon16419Republic of Korea

Although the Ostwald ripening approach is often utilized to manufacture single hollow metal oxide,constructing hollow binary oxide heterostructures as potent photoelectrochemical(PEC)catalysts is still obscure and ***,we reveal a general strategy for fabricating hollow binary oxides heterostructures(Co_(3)O_(4)-δ-MnO_(2)and Co_(3)O_(4)–SnO_(2))utilizing Ostwald *** Co_(3)O_(4)-δ-MnO_(2)nano-network with the structure evolution process was systematically explored through experimental and theoretical tools,identifying the origin of hollow binary oxides due to the interfaces acting as landing sites for their *** addition,the structural evolution,from hollow Co_(3)O_(4)-δ-MnO_(2)to Co_(3)O_(4)-α-MnO_(2),can be observed when the time of secondary hydrothermal reaches 96 h due to the topotactic layer-to-tunnel transition ***,optimized Co_(3)O_(4)-δ-MnO_(2)-48 exhibits a superior PEC degradation efﬁciency of 96.42%and excellent durability(20,000 min)under harsh acid conditions,attributed to the massive hollow structures'vast surface area for high intently active ***,density functional theory simulations elucidated the Co_(3)O_(4)-δ-MnO_(2)’electron-deﬁcient surface and high d-band center(Co_(3)O_(4)-δ-MnO_(2),-1.06;Co_(3)O_(4)-α-MnO_(2),-1.49),strengthening the interaction between the catalyst's surface and active species and prolonging the lifetime of active species ofO_(2)and 1 O_(2).This work not only demonstrates superior PEC degradation efﬁciency of hollow Co_(3)O_(4)-δ-MnO_(2)for practical use but also lays the cornerstone for constructing hollow binary oxides heterostructures through Ostwald ripening.

关键词： Photoelectrocatalysis Binary oxides hollow structures Water puriﬁcation Ostwald ripening

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Grain Boundaries Engineering of hollow Copper Nanoparticles Enables Highly Efficient Ammonia Electrosynthesis from Nitrate

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CCS Chemistry 2022年第6期4卷 2053-2064页

作者： Qi Hu Yongjie Qin Xiaodeng Wang Hongju Zheng Keru Gao Hengpan Yang Peixin Zhang Minhua Shao Chuanxin He College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhenGuangdong 518060 Department of Chemical and Biological Engineering and Energy Institute The Hong Kong University of Science and TechnologyKowloonHong Kong 999077

Electrochemical nitrate reduction reaction(NO_(3)−RR)is an ideal route to produce ammonia(NH_(3))under ambient *** a markedly improved NH3 production rate has been achieved on the NO_(3)−RR compared with the nitrogen reduction reaction(NRR),the NH_(3) production rate of NO_(3)−RR is still well below the industrial Haber-Bosch route due to the lack of robust electrocatalysts for yielding high current densitieswith concurrently good suppression of hydrogen evolution reaction(HER).Herein,we describe an in situ electrochemical strategy for the synthesis of hollow carbon-coated Cu nanoparticles(NPs)(HSCu@C)with abundant grain boundaries(HSCu-AGB@C)for highly efficient NO_(3)−RR in both alkaline and neutral ***,in alkaline media,the HSCu-AGB@C can achieve a maximum NH3 Faradaic efficiency of 94.2% with an ultrahigh NH_(3) rate of 487.8 mmol g^(−1) cat h^(−1) at−0.2 V versus a reversible hydrogen electrode,more than 2.4-fold of the rate obtained in the *** theoretic computations and experimental results uncover that the grain boundaries play the key to improve the NO_(3)−RR ***,the industrial-scale NH_(3) production ratemay open exciting opportunities for the practical electrosynthesis NH_(3) under ambient conditions.

关键词： grain boundaries hollow structures artificial ammonia production nitrate reduction reaction Haber-Bosch route

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Morphological and structural engineering in amorphous Cu2MoS4 nanocages for remarkable electrocatalytic hydrogen evolution

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Science China Materials 2019年第9期62卷 1275-1284页

作者： Jian Yu Anran Li Lidong Li Xiaoxia Li Xiaotian Wang Lin Guo School of Chemistry Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering Beihang University

Morphological and structural control of amorphous nanomaterials is challenging due to the long-range disordered atomic arrangements. Herein, we firstly propose a controllable self-hydrolyzing etching-precipitating (SHEP) method to fabricate the regular-shaped amorphous Cu2MoS4 nanocages (a-Cu2MoS4 NCs) with hollow porous structures under ambient conditions. Benefitting from the hollow porous structures and the amorphous characteristics with copious sulfur vacancies, the a-Cu2MoS4 NCs possess more enhanced activity toward hydrogen evolution reaction (HER) than their crystalline counterparts. The octahedral a-Cu2MoS4 NCs with a shell thickness of 20 nm, which balance the appropriate surface porosity and good structural stability, exhibit the best HER activity with a low overpotential of 96 mV at 10 mA cm^-2 and a small tafel slope of 61 mV decade^-1 in alkaline environment. Moreover, this method is very versatile and can be extended to synthesize other ternary nanocages. Our current work may shed light on the precise controllable synthesis of various ternary nanocages and open a new frontier for developing highly active amorphous catalysts.

关键词： amorphous nanomaterials nanocages hollow structures electrocatalysis hydrogen evolution reaction

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Self-templated synthesis of Ni-Co-Mn-Ce oxides hollow spheres for supercapacitors

Self-templated synthesis of Ni-Co-Mn-Ce oxides hollow sphere...

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河南省化学会2020年学术年会

作者：程承魏成振 School of Chemistry and Chemical Engineering and Henan Key Laboratory of New Optoelectric Functional Materials Anyang Normal University

Ni-Co-Mn-Ce oxides hollow spheres with nanoparticles subunits are synthesized by a facile self-templated method. Glycerol is dispersed in isopropanol to form oil-in-isopropanol quasiemulsion microdroplets, which serve as soft templates for the deposition of the Ni-Co-Mn-Ce glycerate shell. The Ni-Co-Mn-Ce glycerate as templates are annealed to form Ni-Co-Mn-Ce oxides hollow spheres. When tested as electrode materials for supercapacitors,these Ni-Co-Mn-Ce oxides hollow spheres manifest desired electrochemical performances.

关键词： Quasi-emulsion Ni-Co-Mn-Ce oxide hollow structures Electrode materials Energy storage

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Design of Advanced hollow Nanostructures for Electrocatalytic Water Splitting

Design of Advanced Hollow Nanostructures for Electrocatalyti...

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中国化学会第十届全国无机化学学术会议

作者： Le Yu Colleague of Chemical Engineering Beijing University of Chemical Technology

Electrocatalysts are indispensable elements for large-scale water electrolysis, which can efficiently accelerate electrochemical reactions occurring at both ends. Benefitting from high specific surface area, well-defined void space and tuneable chemical compositions, hollow nanostructures could be applied as promising candidates of direct electrocatalysts or supports for loading internal or external catalysts. Herein, I want to summarize the my recent progress in the structural design of micro-/nanostructured hollow materials as advanced catalysts for water splitting and discuss the future research directions of hollow electrocatalysts for water splitting based on our personal perspectives.

关键词： hollow structures water splitting structural/compositional design

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