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A functional gel polymer electrolyte based on pVDF-HFp/gelatin toward dendrite-free lithium metal batteries

Nano Research 2024年第4期17卷 2790-2799页

作者： Xiaoyi Hu Kangli Liu shijie Zhang Guosheng shao s.ravi p.silva peng Zhang state Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) ZhongyuanzhiguXingyang 450100China Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordGU27XHUK

The leakage of liquid electrolyte and the formation of lithium dendrites pose challenges to safety and stability of lithium metal batteries(LMBs).The appearance of gel polymer electrolyte(GpE)has obviously improved the safety of traditional ***,the limited inhibition of GpE on lithium dendrites is detrimental to the safety of ***,a kind of poly(vinylidene fluoride-co-hexafluoropropylene)(pVDF-HFp)/gelatin(GN)GpE with high ionic conductivity,high-temperature resistance,and flame-retardancy,was prepared by electrospinning and soaking *** the electrospinning network of pVDF-HFp,its affinity to liquid electrolytes,makes this GpE more beneficial to ions transport and the formation of ***,the GN with sol–gel properties,enhances the mechanical property(13.5 Mpa)of HFp-GN ***,X-ray photoelectron spectroscopy(Xps)and density functional theory(DFT)suggest that the attraction of polar groups of GN to Li+can regulate the distribution of Li+and protect Li ***,the application of HFp-GN GpEs to LMBs with cathodes of LiFepO_(4) and LiCoO_(2) deliver excellent electrochemical performances:after 300 cycles,the LiFepO_(4)/HFp-GN GpE/Li battery keeps a low capacity decay rate of 0.09%at 5 C;after 400 cycles at 2 C,the LiCoO_(2)/HFp-GN GpE/Li cell retains a high capacity retention of 74%.This GpE is demonstrated for the application prospect of safe LMBs.

关键词： poly(vinylidene fluoride-co-hexafluoropropylene)(pVDF-HFp) gelatin polar groups lithium metal battery lithium dendrite

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EDITORIAL:Now is the Time for Energy Materials Research to save the planet

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Energy & Environmental Materials 2021年第4期4卷 497-499页

作者： s.ravi p.silva Advanced Technology Institute University of SurreyGuildfordUK

Linking Energy supply and Energy storage to the UN sustainable Development Goals Our world has witnessed an unprecedented time in the last twelve months,with many activities coming to a standstill because of the COVID-19 *** all walks of life,the world will not be the same as it struggles for normality at present,with many sectors shut for extended periods of time and some businesses shutdown for ***,with all this upheaval.

关键词： sustainable shutdown struggle

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CO_(2)Emissions post-COp26:Who is Responsible to Curb the Flow?Does it Matter if We Can Make it a Win-Win?

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Energy & Environmental Materials 2022年第3期5卷 683-685页

作者： James Crawshaw s.ravi p.silva Advanced Technology Institute University of SurreyGuildfordUK

The debate about climate change is highly *** everyone is convinced that CO_(2)emissions are worth curbing despite seemingly irrefutable evidence in the IpCC’s latest report.[1]some have vested interests in exploiting fossil fuels while others think alternative,cheaper solutions can be *** that have shifted from manufacturing to service-based economies will find it easier to *** countries with relatively low carbon emissions per capita but large populations believe it is unfair that they should have to bear heavy costs of decarbonization to solve a problem that wealthier countries have created.

关键词： Who is Responsible to Curb the Flow CO_(2)Emissions post-COp26 Does it Matter if We Can Make it a Win-Win

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Carbon Materials in perovskite solar Cells: prospects and Future Challenges

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能源与环境材料（英文） 2019年第2期2卷 107-118页

作者： Victoria Ferguson s.ravi p.silva Wei Zhang Advanced Technology Institute(ATI) University of SurreyGU27XHUK

Metal halide perovskite solar cells are emerging candidates for nextgeneration thin-film photovoltaic devices with the potential for extremely low fabrication cost and high power conversion *** solar cells have demonstrated a rapid development in device performance over the last decade,from an initial 3.81%to a most recently certified 24.2%,though the challenges of long-term stability and lead toxicity still *** materials,ranging from zero-dimensional carbon quantum dots to threedimensional carbon black materials,are promising candidates for the enhancement of both efficiency and stability of perovskite solar cells,offering unique advantages for incorporation into various device *** this review article,we present a concise overview of important and exciting advancements of perovskite solar cells that incorporate different dimensions of carbon material in their device architectures in an effort to simultaneously improve device performance and long-term *** also discuss the major advantages and potential challenges of each technique that has been developed in the most recent ***,we outline the future opportunities toward more efficient and stable perovskite solar cells utilizing carbon materials.

关键词： carbon materials long-term stability metal halide perovskite photovoltaics

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self-assembly of single walled carbon nanotubes onto cotton to make conductive yarn

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particuology 2012年第4期10卷 517-521页

作者： Wei Zhang Yee Yuan Tan Chengwei Wu s.ravi p.silva Nanoelectronics Centre Advanced Technology InstituteUniversity of SurreyGuild fordSurrey GU27XHUnited Kingdom school of Materials science and Engineering Dalian University of TechnologyDalian 116024China state Key Laboratory of structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China

A simple, economical and scalable technique is demonstrated to make conductive yarn. single wailed carbon nanotubes （sWCNTs） are non-covalently functionalized with dye （Acid Red 91） and dispersed in water; while cotton yarn is treated with poly （ethylene imine）. When the resulting yarn is immersed in the sWCNT dispersion, sWCNTs self-assemble onto the yarn due to electrostatic forces between the functionalJzed nanotubes and yarn. scanning electron microscopy, transmission electron microscopy and Raman spectroscopy indicate the assembly of carbon nanotubes. The sWCNT functionalized yarn exhibits reasonable electrical conduction behaviour and are then used to make chemiresistors. The electrical resistance of the chemiresistors used as sensors increases on exposure to ammonia gas, which can be explained in terms of electron transfer between gas molecules and sWCNTs.

关键词： Carbon nanotubesElectrical conductionsensorAmmonia

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Effect of surfactants on the Thermoelectric performance of Double-Walled Carbon Nanotubes

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Energy & Environmental Materials 2023年第1期6卷 274-280页

作者： Zakaria saadi simon G.King Jose V.Anguita Vlad stolojan s.ravi p.silva Department of Electrical and Electronic Engineering Advanced Technology InstituteUniversity of SurreyGuildford GU27XHUK

Thermoelectrics are a promising solution to the recovery of some of the 60%of the worldwide energy wasted as ***,their conversion efficiency is low and the best performing materials are brittle,toxic,and made of expensive *** challenge in developing better performing materials is in disrupting the electrical vs thermal conductivity correlation,to achieve low thermal conductivity simultaneously with a high electrical *** nanotubes allow for the decoupling of the electronic density of states from the phonon density of states and this paper shows that flexible,thin films of double-walled carbon nanotube(DWCNT)can form effective n-and p-doped semiconductors that can achieve a combined seebeck coefficient of 157.6µV K^(−1),the highest reported for a single DWCNT device to *** is achieved through selected surfactant doping,whose role is correlated with the length of the hydrocarbon chain of the hydrophobic tail group of the surfactant’s *** functionalized with Triton X-405 show the highest output power consisting of a single junction of p-and n-type thermoelectric elements,reaching as high as 67 nW for a 45 K temperature *** enabling flexible,cheaper,and more efficient thermoelectric generators through the use of functionalized CNTs.

关键词： carbon nanotubes DWCNT functionalization surfactant thermoelectric

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Zinc-Based Metal-Organic Frameworks for High-performance supercapacitor Electrodes:Mechanism Underlying pore Generation

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Energy & Environmental Materials 2023年第2期6卷 100-112页

作者： shigeyuki Umezawa Takashi Douura Koji Yoshikawa Daisuke Tanaka Vlad stolojan s.ravi p.silva Mika Yoneda Kazuma Gotoh Yasuhiko Hayashi seiwa Electric Mfg.Co.Ltd. Kyoto 610-0192Japan Graduate school of Natural science and Technology Okayama UniversityOkayama 700-8350Japan school of science and Technology Kwansei Gakuin UniversityHyogo 669-1337Japan JST PRESTO2-1 GakuenHyogo 669-1337Japan Advanced Technology Institute University of SurreyGuilfordSurreyGU27XHUK

Heat treatment of metal-organic frameworks(MOFs)has provided a wide variety of functional carbons coordinated with metal *** this study,two kinds of zinc-based MOF(ZMOF),C_(16)H_(10)O_(4)Zn(ZMOF1)and C_(8)H_(4)O_(4)Zn(ZMOF2),were ***1 and ZMOF2 were carbonized at 1000℃,forming CZMOF1 and CZMOF2,*** specific surface area(s_(BET))of CZMOF2 was~2700 m^(2)g^(−1),much higher than that of CZMOF1(~1300 m^(2)g^(−1)).A supercapacitor electrode based on CZMOF2 achieved specific capacitances of 360,278,and 221 F g^(−1)at 50,250,and 1000 mA g^(−1)in an aqueous electrolyte(H2sO_(4)),respectively,the highest values reported to date for ZMOF-derived electrodes under identical *** practical applicability of the CZMOF-based supercapacitor was verified in non-aqueous *** initial capacitance retention was 78%after 100000 charge/discharge cycles at 10 A g^(−1).Crucially,the high capacitance of CZMOF2 arises from pore generation during *** 1000℃,pore generation is dominated by the Zn/C ratio of ZMOFs,as carbon atoms reduce the zinc oxides formed during *** 1000℃,a high O/C ratio becomes essential for pore generation because the oxygen functional groups are *** findings will provide insightful information for other metal-based MOFderived multifunctional carbons.

关键词： metal-organic frameworks pore generation porous carbons supercapacitor zinc oxides

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Complex permittivity-dependent plasma confinement-assisted growth of asymmetric vertical graphene nanofiber membrane for high-performance Li-s full cells

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InfoMat 2022年第7期4卷 129-146页

作者： Yongshang Zhang Zhiheng Wu shaobin Wang Neng Li s.ravi p.silva Guosheng shao peng Zhang state Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhouChina Zhengzhou Materials Genome Institute(ZMGI) ZhengzhouChina school of Chemical Engineering and Advanced Materials University of AdelaideAdelaideSouth AustraliaAustralia state Key Laboratory of silicate Materials for Architecture Wuhan University of TechnologyWuhanChina Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordUK

Vertical graphene(VG),possessing superior chemical,physical,and structural peculiarities,holds great promise as a building block for constructing a high-energy density lithium-sulfur(Li-s)***,it is desirable to develop a new VG growth technique with a novel structure to enable wide ***,we devise a novel complex permittivity-dependent plasma confinement-assisted VG growth technique,via asymmetric growing a VG layer on one side of N-doped carbon nanofibers for the first time,using a unique lab-built high flux plasma-enhanced chemical vapor deposition system,as a bifunctional nanofiber membrane to construct Li-s batteries with low neg-ative/positive(N/p)and electrolyte/sulfur(E/s)*** unique nanofiber membrane could simultaneously protect the cathode and anode,enabling an excellent electrochemical performance with low N/p and E/s ratios in Li-s *** a full cell delivers high gravimetric energy density and volumetric energy density of 340 Wh kg^(-1) and 547 Wh L^(-1),respectively,at low N/p(2:1)and E/s(4:1)***,a pouch cell achieves a high areal capacity of 7.1 mAh cm^(-2) at a sulfur loading of 6 mg cm^(-2).This work put forward a novel pathway for the design of high-energy density Li-s batteries.

关键词： asymmetric complex permittivity electrospinning Li-s batteries vertical graphene

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progress of pb-sn Mixed perovskites for photovoltaics: A Review

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Energy & Environmental Materials 2022年第2期5卷 370-400页

作者： Rajapakshe Mudiyanselage Indrachapa Bandara shashini M.silva Cameron C.L.Underwood K.D.G.Imalka Jayawardena Radu A.sporea s.ravi p.silva Advanced Technology Institute Faculty of Engineering and Physical SciencesUniversity of SurreyGuildford Surrey GU27XHUnited Kingdom

pb-sn mixed perovskites are becoming increasingly popular as narrowbandgap(1.2–1.3 eV)light absorbers in single-junction perovskite solar cells(psCs)and as bottom cells for all-perovskite tandem solar cells,for highefficiency,low-cost,lightweight,roll-to-roll printable photovoltaic(pV)*** the first report of planar pb:sn mixed psCs in 2014,the power conversion efficiencies(pCE)have increased from 10%to 21%by the end of 2020 with an exponential growth in research conducted in this *** much effort,the performance and stability of pb-sn mixed psCs are still limited,which constrains their long-term use in all-perovskite tandem *** review highlights the avenues explored in improving different aspects of pb-sn mixed psCs and provides a comprehensive discussion of the interdependent factors affecting the device *** includes compositional engineering of the perovskite crystal,absorber layer fabrication and crystallization methods,bandgap tuning,sn4+reduction,and surface passivation of the absorber layer,as well as the selection of interlayers and electrodes of the final psC.

关键词： inorganic-organic hybrids lead-tin mixed perovskites perovskites photovoltaics solution-processed

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Exceptional rate capability from carbon-encapsulated polyaniline supercapacitor electrodes

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Energy & Environmental Materials 2020年第3期3卷 389-397页

作者： Ash stott Mehmet O.Tas Elaine Y.Matsubara Mateus G.Masteghin Jose M.Rosolen Radu A.sporea s.ravi p.silva Advanced Technology Institute Guildford Surrey GU27XHUK Departamento de Química Faculdade de FilosofiaCiên-cias e Letras de Ribeirão Preto1-Universidade de São PauloAvenida Bandeirantes 390014040-901Ribeirão Preto SP Brazil

A high-rate capability carbon-encapsulated polyaniline(pANI)composite is fabricated by a novel electrodeposition method of polyaniline on a carbon nanotube(CNT)forest,grown on carbon *** is followed by coating of an amorphous carbon layer via hydrothermal carbonization(HTC)of glucose,forming a three-layer *** demonstrate that a slow scan rate,voltage-restricted electrodeposition process can be used to produce a uniform pANI coating on individual CNTs throughout the *** CNT forest structure offers excellent electronic and structural connection for the pANI nanofiber network,while the coating of amorphous carbon reduces electrode resistance,promoting enhanced electrochemical performance and reinforced structural stability during charging and *** as-prepared CNT/pANI/HTC composite exhibited a high specific capacitance of 571 F g-1 at 1 A g-1,and 557 F g-1 at 100 A g-1,whilst demonstrating a record rate capability of 98%capacitance retention,when the current density is increased *** advanced rate performance indicates that a slow electrodeposition process produces an electrochemically stable three-layer composite with enhanced diffusion ***,the method developed in this work establishes further control on the electrochemical deposition of energy storage materials,for high-rate capability.

关键词： CNT electrodeposition high rate polyaniline supercapacitor

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