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Nano Research 2016年第2期9卷 451-457页

作者： Bing Han Lin Shi Xiaoqing Gao Jun Guo Ke Hou Yonglong Zheng Zhiyong Tang Laboratory of Nanomaterials National Center for Nanoscience and Technology Beijing 100190 China

Chiral nano-assemblies with amplified optical activity have attracted particular interest for their potential application in photonics, sensing and catalysis. Yet it still remains a great challenge to realize their real applications because of the instability of these assembled nanostructures. Herein, we demonstrate a facile and efficient method to fabricate ultra-stable chiral nanostructures with strong chiroptical properties. In these novel chiral nanostructures, side-by-side assembly of chiral cysteine-modified gold nanorods serves as the core while mesoporous silica acts as the shell. The chiral core-shell nanostructures exhibit an evident plasmonic circular dichroism （CD） response originating from the chiral core. Impressively, such plasmonic CD signals can be easily manipulated by changing the number as well as the aspect ratio of Au nanorods in the assemblies located at the core. In addition, because of the stabilization effect of silica shells, the chiroptical performance of these core-shell nanostructures is significantly improved in different chemical environments.

关键词： chiral core-shell nanostructure plasmonic circular dichroism gold nanorods self-assembly high stability

Pathway for high-energy density LiMnFePO4 cathodes

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Progress in Natural Science:Materials International 2023年第1期33卷 126-131页

作者： Shaoluan Huang Wenzhong Lin Liewu Li Pei Liu Tao Huang Zhencheng Huang Jinli kong Wei Xiong Wenwei Yu Shenghua Ye Jiangtao Hu Qianling Zhang Jianhong Liu Graphene Composite Research Center College of Chemistry and Environmental Engineering Shenzhen University Shenzhen Eigen–Equation Graphene Technology Co.Ltd.

Polyanion cathodes are credited for its thermal stability and better safety, no matter in lithium ion batteries or sodium ion batteries. Polyanion oxides with phosphate groups came to the public’s attention in 1997, and the representative material is LiFePO4, which has been widely applied and plays a huge role in the field of powder batteries and energy storage system. However, owing to the low lithiation potentials and storage sites, the energy densities of polyanion cathodes have been restricted, resulting of low-endurance and limited application scenarios. Accordingly, here, we use cheap and environmental friendly raw materials as precursors to synthesis high energy density LiMn0.6Fe0.4PO4@C cathode by a simple spray-drying and high temperature calcination *** self-designed liquid polyacrylonitrile(LPAN) is added for the intention of nanoparticle coating, conductive network construction and particle granulation. The low-cost and carbon-coated LiMn0.6Fe0.4PO4cathode exhibits excellent reversible capacity, low electrochemical polarization and excellent rate capacity, which maintains93.5% capacity retention after cycling 1000 times at 5C. The work introduces a new avenue to fabricate olivine structure cathodes with outstanding electrochemical performance for the high energy density lithium ion batteries.

关键词： Polyanion cathode Liquid polyacrylonitrile Cost effective high energy density high stability

Fabrication and research of bi-functional CuNi_(2)S_(4) nanosheets decorated TiO_(2)/CuNi_(2)S_(4) heterojunction photoanode for photoelectrochemical water splitting

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Chinese Physics B 2023年第11期32卷 124-133页

作者：金伟张立媛张文静孙倩张德恺苗慧胡晓云 School of Physics Northwest UniversityXi’an 710127China

As a traditional n-type semiconductor, TiO_(2)has good UV absorption ability and stable physical and chemical properties. However, its wide band gap and low oxygen evolution reaction(OER) activity limit its application in the field of photoelectrochemical(PEC) water splitting. In this work, a type-Ⅱ TiO2/CuNi2S4heterojunction photoanode is successfully constructed, which expanded the light absorption range to visible and enhanced the OER activity. Firstly, TiO2nanotubes(NTs) thin films are prepared on Ti substrates by two-step anodization, and then the bi-functional electrocatalytic material CuNi2S4is grown on TiO2NTs in the shape of nanosheets(NSs) in situ by solvothermal method. As a bi-functional electrocatalytic material, CuNi2S4has good visible light absorption property as well as OER catalytic activity. Compared with TiO_(2), the IPCE value of TiO_(2)/CuNi_(2)S_(4)is 2.59% at 635 nm, and that of TiO2is a mere 0.002%.The separation efficiency and injection efficiency increase from 2.49% and 31.52% to 3.61% and 87.77%, respectively. At 1.23 V vs. RHE, the maximum photocurrent density is 0.26 m A/cm^(2), which is 2.6 times than that of TiO2(0.11 m A/cm^(2)),and can be maintained at 0.25 m A/cm^(2)for at least 2 h under light illumination. Moreover, a hydrogen production rate of 4.21 μmol·cm^(-2)·h^(-1)is achieved within 2 h. This work provides a new idea for the application of TiO_(2)in the field of PEC water splitting and the construction of efficient and stable photoelectronic devices.

关键词： TiO_(2) CuNi2S4 high stability photoelectrochemical properties

How to stabilize standard perovskite solar cells to withstand operating conditions under an ambient environment for more than 1000 hours using simple and universal encapsulation

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Journal of Energy Chemistry 2023年第3期78卷 246-252,I0008页

作者： Nikolai A.Belich Andrey A.Petrov Pavel A.Ivlev Natalia N.Udalova Alla A.Pustovalova Eugene A.Goodilin Alexey B.Tarasov Laboratory of New Materials for Solar Energetics Faculty of Materials ScienceLomonosov Moscow State University119991 MoscowRussia Department of Chemistry Lomonosov Moscow State University119991 MoscowRussia

We introduce a simple and universal scalable encapsulation strategy for perovskite solar cells based on thermal vacuum evaporation of MgF2or MoO3-xcapping layer followed by sealing the device with glass and UV-curable *** proposed encapsulation method is beneficial to most of the other known encapsulation approaches being fully harmless to perovskite and transporting layers and processible at room *** deposition of the capping layer promotes efficient removal of water,oxygen and organic solvent residuals from the device prior to sealing and could be easily performed using standard equipment for metal electrode *** proposed strategy is transferrable to any lab-scale perovskite solar cell prototypes regardless of their geometry and architecture and results in excellent stability of the devices in ambient air and long operating *** the 1000 hours stability test at ambient air(30%-60% RH),the cells preserved 92.9% of their initial efficiency on average under 1 Sun illumination at constant maximum power point tracking(MPPT,ISOS-L-1) and over 96% under sto rage in the dark(ISOS-D-1),thus evidencing for the high effectiveness of the proposed encapsulation approach.

关键词： Perovskite solar cells Halide perovskites Encapsulation high stability ISOS-L-1

Engineer Nanoscale Defects into Selective Channels:MOF-Enhanced Li^(+) Separation by Porous Layered Double Hydroxide Membrane

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Nano-Micro Letters 2023年第9期15卷 325-336页

作者： Yahua Lu Rongkun Zhou Naixin Wang Yuye Yang Zilong Zheng Miao Zhang Quan-Fu An Jiayin Yuan Beijing Key Laboratory for Green Catalysis and Separation Department of Chemical EngineeringBeijing University of TechnologyBeijing 100124People’s Republic of China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124People’s Republic of China Department of Materials and Environmental Chemistry Stockholm University10691 StockholmSweden

Two-dimensional(2D)membrane-based ion separation technology has been increasingly explored to address the problem of lithium resource shortage,yet it remains a sound challenge to design 2D membranes of high selectivity and permeability for ion separation *** imidazolate framework functionalized modified layered double hydroxide(ZIF-8@MLDH)composite membranes with high lithium-ion(Li^(+)) permeability and excellent operational stability were obtained in this work by in situ depositing functional ZIF-8 nanoparticles into the nanopores acting as framework defects in MLDH *** defect-rich framework amplified the permeability of Li^(+),and the site-selective growth of ZIF-8 in the framework defects bettered its *** speaking,the ZIF-8@MLDH membranes featured a high permeation rate of Li^(+) up to 1.73 mol m^(−2) h^(−1) and a desirable selectiv-ity of Li^(+)/Mg^(2+) up to *** supported that the simultaneously enhanced selectivity and permeability of Li+are attributed to changes in the type of mass transfer channels and the difference in the dehydration capacity of hydrated metal cations when they pass through nanochannels of *** study will inspire the ongoing research of high-performance 2D membranes through the engineering of defects.

关键词： Nanoscale defect construction Nanoparticles restrict growth Two-dimensional composite membrane Lithium-ion extraction high stability

A highly stable membrane with hierarchical structure for wide pH range flow batteries

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Journal of Energy Chemistry 2021年第5期30卷 80-86页

作者： Jing Hu Donglei Yu Tianyu Li Huamin Zhang Zhizhang Yuan Xianfeng Li Division of Energy Storage Dalian National Laboratory for Clean Energy(DNL)Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

A membrane with high stability and ion conductivity in wide pH range is essential for energy storage ***,we report a novel membrane with hierarchical core-shell structure,which demonstrates high stability and ion conductivity,simultaneously under a wide pH range *** characterizations and theoretical calculation indicate that the non-solvent induces the chain segment configuration and eventually leads to polymer-polymer phase separation,thus forming hierarchical porous core-shell *** from this structure,an acidic vanadium flow battery(VFB)with such a membrane shows excellent performance over 400 cycles with an energy efficiency(EE)of above 81%at current density of 120 mA cm^(-2) and an alkaline zinc-iron flow battery(AZIFB)delivers a cycling stability for more than 200 cycles at 160 mA cm^(-2),along with an EE of above 82%.This paper provides a cost-effective and simple way to fabricate membranes with high performance for variety of energyrelated devices.

关键词： Energy storage Wide pH range flow batteries Hierarchical porous membrane Core-shell structure high stability

Calixarenes enabling well-adjusted organic-inorganic interface for inverted organic solar cells with 18.25%efficiency and multifold improved photostability under max power point tracking

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Science China Chemistry 2023年第1期66卷 195-201页

作者： Shitong Li Zheng Xiao Juan-Juan Li Zong-Ying Hu Yang Yang Bin Kan Dong-Sheng Guo Xiangjian Wan Zhaoyang Yao Chenxi Li Yongsheng Chen State Key Laboratory of Elemento-Organic Chemistry The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai University Tianjin300071China College of Materials Science and Engineering Nankai UniversityTianjin 300350China The Institute of Seawater Desalination and Multipurpose Utilization Ministry of Natural Resources(Tianjin)Tianjin 300192China

Compared with organic solar cells(OSCs) adopting conventional architecture,inverted OSCs have offered generally better stability,where Zn O is the most widely used electron transporting layer(ETL) *** ZnO-based inverted OSCs,a welltuned interface of organic(active layer)-inorganic(Zn O film) with matched surface energy(γS) is critical for both high performance and high *** this work,two typical calixarenes,C4A and Bu C4A,were employed as the tuning agents to adjust this organic-inorganic interface for ZnO-based inverted *** a result,with PM6:L8-BO as the active layer,significantly promoted power conversion efficiencies(PCEs) from 17.14%(for ZnO) to 18.25%(for ZnO/C4A) and 17.80%(for ZnO/Bu C4A) were *** studies indicate that the enhanced performance is due to the faster charge extraction process,the suppressed recombination and more ideal internal electric field in ZnO/calixarene-based *** addition,wellmatched interface energy and more ordered molecular aggregation in active layer effectively improved photostability and thermal stability for ZnO/calixarene-based *** results indicate that calixarenes could act as effective modifying agents of ZnO to improve inverted OSCs’ performance and stability simultaneously,and likely also stimulate calixarenes’ and other macromolecules’ broader studies in other organic electronic devices.

关键词： organic solar cell calixarenes interface adjustment ZnO modification high performance high stability

high-performance oxygen reduction catalysts in both alkaline and acidic fuel cells based on pre-treating carbon material and iron precursor

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Science Bulletin 2017年第23期62卷 1602-1608页

作者： Ping Song Heather M.Barkholtz Ying Wang Weilin Xu Dijia Liu Lin Zhuang State Key Laboratory of Electroanalytical Chemistry Jilin Province Key Laboratory of Low Carbon Chemical Power Changchun Institute of Applied ChemistryChinese Academy of Sciences Chemical Sciences and Engineering Division Argonne National Laboratory College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University

We demonstrate a new and simple method for pre-treating the carbon material and iron precursor to prepare oxygen reduction reaction(ORR) catalysts, which can produce super-high performance and stability in alkaline solution, with high performance in acid solution. This strategy using cheap materials is simply controllable. Moreover, it has achieved smaller uniform nanoparticles to exhibit high stability, and the synergetic effect of Fe and N offered much higher performance in ORR than commercial Pt/C, with high maximum power density in alkaline and acid fuel cell test. So it can make this kind of catalysts be the most promising alternatives of Pt-based catalysts with best performance/price.

关键词： Pre-treatment Uniform nanoparticle Super-high performance high stability Fuel cell

high-entropy L1_(2)-Pt(FeCoNiCuZn)_(3) intermetallics for ultrastable oxygen reduction reaction

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Journal of Energy Chemistry 2023年第11期86卷 158-166,I0004页

作者： Qian Zhang Tao Shen Min Song Shuang Wang Jialin Zhang Xiao Huang Shanfu Lu Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Space and EnvironmentBeihang UniversityBeijing 100191China

Enhancing the stability of Pt-based electrocatalysts for the sluggish cathodic oxygen reduction reaction(ORR)is critical for proton exchange membrane fuel cells(PEMFCs).Herein,high-entropy intermetallic(HEI)L1_(2)-Pt(FeCoNiCuZn)3is designed for durable ORR *** from the unique HEI structure and the enhanced intermetallic phase stability,Pt(FeCoNiCuZn)3/C nanoparticles demonstrate significantly improved stability over Pt/C and PtCu_(3)/C *** Pt(FeCoNiCuZn)3/C exhibits a negligible decay of the half-wave potential during 30,000 potential cycles from 0.6 to 1.0 V,whereas Pt/C and PtCu_(3)/C are negatively shifted by 46 and 36 m V,*** after 10,000 cycles at potential up to 1.5 V,the mass activity of Pt(FeCoNiCuZn)3/C still shows~70%*** evidenced by the structural characterizations,the HEI structure of Pt(FeCoNiCuZn)3/C is well maintained,while PtCu_(3)/C nanoparticles undergo severe Cu leaching and particle *** addition,when assembled Pt(FeCoNiCuZn)3/C as the cathode in high-temperature PEMFC of 160℃,the H_(2)-O_(2)fuel cell delivers almost no degradation even after operating for 150 h,demonstrating the potential for fuel cell *** work provides a facile design strategy for the development of high-performance ultrastable electrocatalysts.

关键词： high-entropy intermetallics Pt-based electrocatalysts Oxygen reduction reaction high stability

highly active and stable Co nanoparticles embedded in nitrogen-doped mesoporous carbon nanofibers for aqueous-phase levulinic acid hydrogenation

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Green Energy & Environment 2021年第4期6卷 567-577页

作者： Shuai Shao Ying Yang Shangwei Guo Shijie Hao Feng Yang Suoying Zhang Yang Ren Yangchuan Ke State Key Laboratory of Heavy Oil Processing China University of PetroleumChangpingBeijing102249China X-Ray Science Division Argonne National Laboratory9700 S.Cass Ave.ArgonneIllinois60439USA

Developing a highly active and durable non-noble metal catalyst for aqueous-phase levulinic acid(LA)hydrogenation to g-valerolactone(GVL)is an appealing yet challenging ***,we report well-dispersed Co nanoparticles(NPs)embedded in nitrogen-doped mesoporous carbon nanofibers as an efficient catalyst for aqueous-phase LA hydrogenation to *** Co zeolitic imidazolate framework(ZIF-67)nanocrystals were anchored on the sodium dodecyl sulfate modified wipe fiber(WF-S),yielding one-dimensional(1-D)structured composite(ZIF-67/WF-S).Subsequently,Co NPs were uniformly embedded in nitrogen-doped mesoporous carbon nanofibers(Co^(R)NC/SMCNF)through a pyrolysis-reduction strategy using ZIF-67/WF-S as the *** from introducing modified wipe fiber WF-S to enhance the dispersion of Co NPs,and Co^(0) with Co-N_xdual active sites,the resulting Co^(R)NC/SMCNF catalyst shows brilliant catalytic activity(206 h^(-1) turnover frequency).Additionally,the strong metal-support interactions greatly inhibited the Co NPs from aggregation and leaching from the mesoporous carbon nanofibers,and thus increasing the reusability of the Co^(R)NC/SMCNF catalyst(reusable nine times without notable activity loss).

关键词： Co nanoparticles Mesoporous carbon nanofiber Dual active sites Aqueous levulinic acid hydrogenation high stability