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Journal of Materiomics 2023年第1期9卷 174-182页

作者： Gajula Prasad Xiongwei Lin Junwei Liang Yingbang Yao Tao Tao Bo Liang Sheng-Guo Lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangdong Provincial Key Laboratory on the Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Dongguan South China Design Innovation Institute Building D-1University Innovation City AreaSongshan LakeDongguan523808China

Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous membrane.In this paper,we prepared highly intra porous fibrous poly(vinylidene fluoride)(PVDF)membranes using an innovated water-mediated electrospinning approach.FTIR-ATR and XRD techniques confirmed the conversion of non-polarα-phase to polarβ-phase in electrospun membranes.The porous fibrous membrane M–16 had adsorbed oil almost 120%and metal adsorption around 15%,12%,5%,13%respectively for Pb^(2+),Cd^(2+),Cu^(2+)and Zn^(2+),which are larger than the counterpart of nonporous M–18.The nonporous fibrous membranes have better peak to peak output voltage(Vp-Vp)2 to 3 times than the porous fibrous membranes(M–16).The results show apparent potential applications in wastewater/oil spill treatment as well as piezoelectric sensors.

关键词： poly(vinylidene fluoride) Porous fibrous membrane Metal removal Oil absorption and peak to peak output voltage

Large electrocaloric effect obtained in BaSn_(x)Ti_(1-x)O_(3) lead-free ceramics using direct and indirect measurements

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Journal of Advanced Dielectrics 2018年第5期8卷 64-69页

作者： Jiang Li Dan-Dan Li Biao Lu Ying-Bang Yao Tao Tao Bo Liang Wen-Hui Lu Ge-Li Luo Sheng-Guo Lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices guangdong provincial Key Laboratory of Functional Soft Condensed Matter School of materials and energy Guangdong University of Technology Guangzhou 510006P.R.China

The electrocaloric effect(ECE)in lead-free BaSn_(x)Ti_(1-x)O_(3)(BSnT,x=0.05,0.10 and 0.15)ceramics were investigated using a direct ECE measurement.Results indicate that the maximum ECE occurs near the Curie temperature and it slightly shifts towards high temperatures.The directly measured ECE is larger than that calculated using the Maxwell relation and P-E loops.A maximum electrocaloric efficiencyΔT=ΔE=0.49-10-6 KmV-1 was procured for the composition with x=0.15 at T=299.2 K.And it also shows a broad peak in the temperature range of 250–320 K.

关键词： BaSnTiO_(3)ceramic direct measurement electrocaloric effect.

Enhanced electrocaloric effect at room temperature in Mn^(2+) doped lead-free(BaSr)TiO_(3) ceramics via a direct measurement

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Journal of Advanced Ceramics 2021年第3期10卷 482-492页

作者： Xiang NIU Xiaodong JIAN Xianyi CHEN Haoxuan LI Wei LIANG Yingbang YAO Tao TAO Bo LIANG Sheng-Guo LU Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangdong Provincial Key Laboratory of Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Dongguan South China Design Innovation Institute Dongguan 523808China

(Ba_(1-x)Sr_(x))(MnyTi1-y)O_(3)(BSMT)ceramics with x=35,40 mol%and y=0,0.1,0.2,0.3,0.4,0.5 mol%were prepared using a conventional solid-state reaction approach.The dielectric and ferroelectric properties were characterized using impedance analysis and polarization-electric field(P-E)hysteresis loop measurements,respectively.The adiabatic temperature drop was directly measured using a thermocouple when the applied electric field was removed.The results indicate that high permittivity and low dielectric losses were obtained by doping 0.1-0.4 mol%of manganese ions in(BaSr)TiO_(3)(BST)specimens.A maximum electrocaloric effect(ECE)of 2.75 K in temperature change with electrocaloric strength of 0.55 K·(MV/m)^(-1)was directly obtained at~21℃and 50 kV/cm in Ba_(0.6)Sr_(0.4)Mn_(0.001)Ti_(0.999)O_(3) sample,offering a promising ECE material for practical refrigeration devices working at room temperature.

关键词： barium strontium titanate ceramics permittivity dielectric loss electrocaloric effect electrocaloric strength

Enhancement of solvent uptake in porous PVDF nanofibers derived by a water-mediated electrospinning technique

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Journal of Materiomics 2021年第2期7卷 244-253页

作者： Gajula Prasad Jun-Wei Liang Wei Zhao Yingbang Yao Tao Tao Bo Liang Sheng-Guo Lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangzhou510006China guangdong provincial Key Laboratory on the Functional Soft Condensed Matter Guangzhou510006China School of materials and energy Guangdong University of TechnologyGuangzhou510006China Dongguan South China Design Innovation Institute Building D-1University Innovation City AreaSongshan LakeDongguan523808China

The effect of a N,N-dimethylformamide(DMF)/acetone solvent system(3:7,4:6,5:5,6:4,7:3)and spinning medium(air and water)on the membrane morphology and the structure-property relationship were investigated.A facile method was optimized to generate a porous,polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone(4:6)solvent system in a water medium.The attenuated total reflection(ATR)-Fourier transform infrared(FTIR)results showed an increased b-phase compared to the pristine poly(vinylidene fluoride)(PVDF).The XRD and DSC results further confirmed that the co-existing a-and b-phases in the pristine PVDF were converted into a unique b-phase in the electrospun membranes.In addition,the solvent uptake percentage of the DMF/acetone(4:6)solvent system in a water medium(540)is much greater than that in an air medium(320),and over two times better than that of commercial polyethylene(PE)membranes(190).Similarly,the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone(4:6)solvent system in a water medium is higher than that of the air medium.This enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.

关键词： Polyvinylidene fluoride Electrospinning Thermally induced phase separation Viscosity Porous fibers Discharge capacity Solvent uptake

Shorter alkyl chain in thieno[3,4-c]pyrrole-4,6-dione(TPD)-based large bandgap polymer donors – Yield efficient non-fullerene polymer solar cells

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Journal of energy Chemistry 2021年第2期30卷 69-76,I0003页

作者： Jiaji Zhao Xuelong Huang Qingduan Li Shengjian Liu Ziqiang Fan Di Zhang Shanshan Ma Zhixiong Cao Xuechen Jiao Yue-Peng Cai Fei Huang School of Chemistry Guangzhou Key Laboratory of Materials for Energy Conversion and StorageGuangdong Provincial Engineering Technology Research Center for Materials for Energy Conversion and StorageSouth China Normal University(SCNU)Guangzhou 510006GuangdongChina Department of materials Science and Engineering Monash UniversityVictoria 3800Australia Institute of Polymer Optoelectronic materials and devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology(SCUT)Guangzhou 510640GuangdongChina College of Pharmacy Cannan Medical UniversityGanzhou 341000JiangxiChina

Typically,conjugated polymers are composed of conjugated backbones and alkyl side chains.In this contribution,a cost-effective strategy of tailoring the length of alkyl side chain is utilized to design highperforming thieno[3,4-c]pyrrole-4,6-dione(TPD)-based large bandgap polymer donors PBDT-BiTPD(Cχ)(χ=48,52,56),in which x represents the alkyl side chain length in term of the total carbon number.A combination of light absorption,device,and morphology examinations make clear that the shorter alkyl side chains yield(i) higher crystallinity and more predominant face-on crystallite orientation in their neat and BHJ blend films,(ii) higher charge mobilities(6.7×10^(-4) cm~2 V^(-1) s^(-1) for C48 vs.3.2×10^(-4) cm~2 V^(-1) s^(-1) for C56),and negligible charge recombination,consequently,(iii) significantly improved fill-factor(FF) and short current(J_(SC)),while almost the same open circuit voltage(V_(OC)) of ca.0.82 V in their corresponding BHJ devices.In parallel,as alkyl side chain lengths decrease from C56 to C48,power conversion efficiencies(PCEs) increased from 7.8% for C56 to 11.1% for C52,and further to14.1% for C48 in their BHJ solar cells made with a narrow bandgap non-fullerene acceptor Y6.This systematic study declares that shortening the side chain,if providing appropriate solubility in device solution processing solvents,is of essential significance for developing high-performing polymer donors and further improving device photovoltaic performance.

关键词： Polymer solar cells Polymer donors Thieno[3 4-c]pyrrole-4 6-dione Bulk heterojunction Side chain

Photo-thermoelectric generator integrated in graphene-based actuator for self-powered sensing function

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Nano research 2022年第6期15卷 5376-5383页

作者： Peidi Zhou Jian Lin Wei Zhang Zhiling Luo Luzhuo Chen Fujian provincial Key Laboratory of Quantum Manipulation and New energy materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian provincial Collaborative Innovation center for Advanced High-Field Superconducting materials and Engineering Fuzhou 350117China Fujian provincial Engineering Technology research center of Solar energy conversion and energy Storage Fuzhou 350117China

smart actuators integrated with sensing functions are taking a significant role in constructing intelligent robots.However,the detection of sensing signals in most actuators requires external electrical power,lacking in the self-powered feature.Herein,we report a graphene-based light-driven actuator with self-powered sensing function,which is designed by integrating a photothermoelectric generator into the actuator intelligently.When one part of the actuator is irradiated by near-infrared light,it shows a deformation with bending curvature up to 1.5 cm^(−1),owing to the mismatch volume changes between two layers of the actuator.Meanwhile,the temperature difference across the actuator generates a voltage signal due to the photo-thermoelectric effect.The Seebeck coefficient is higher than 40μV/K.Furthermore,the self-powered voltage signal is consistent with the deformation trend,which can be used to characterize the deformation state of actuator without external electrical power.We further demonstrate a gripper and a bionic hand.Their deformations mimic the motions of human hand(or finger),even making complex gestures.Concurrently,they can output self-powered voltage signals for sensing.We hope this research will pave a new way for selfpowered devices,state-of-the-art intelligent robots,and other integrated multi-functional systems.

关键词： photo-thermoelectric effect generator light-driven actuator self-powered graphene

Improving the stability and scalability of all-inorganic inverted CsPbI_(2)Br perovskite solar cell

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Journal of energy Chemistry 2022年第5期31卷 176-183页

作者： Chenghao Duan Qiaoyun Wen Yan Fan Jiong Li Zidan Liu Keyou Yan School of Environment and energy State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510000GuangdongChina Medical devices research&Testing center South China University of TechnologyGuangzhou 510000GuangdongChina

All-inorganic perovskite solar cells(PSCs) have potential to pass the stability international standard of IEC61215:2016 but cannot deliver high performance and stability due to the poor interface contact. In this paper, Sn-doped TiO_(2)(Ti_(1-x)Sn_(x)O_(2)) ultrathin nanoparticles are prepared for electron transport layer(ETL) by solution process. The ultrathin Ti_(1-x)Sn_(x)O_(2) nanocrystals have greatly improved interface contact due to the facile film formation, good conductivity and high work function. The all-inorganic inverted NiOx/CsPbI_(2)Br/Ti_(1-x)Sn_(x)O_(2)p-i-n device shows a power conversion efficiency(PCE) of 14.0%. We tested the heat stability, light stability and light-heat stability. After stored in 85℃ for 65 days, the inverted PSCs still retains 98% of initial efficiency. Under continuous standard one-sun illumination for 600 h,there is no efficiency decay, and under continuous illumination at 85℃ for 200 h, the device still retains 85% of initial efficiency. The 1.0 cm^(2) device of inverted structure shows a PCE of up to 11.2%. The ultrathin Ti_(1-x)Sn_(x)O_(2)is promising to improve the scalability and stability and thus increase the commercial prospect.

关键词： All-inorganic perovskite Sn-doped TiO_(2) Ultrathin nanocrystal Stability Scalability

Controlling upconversion through interfacial energy transfer(IET):Fundamentals and applications

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Journal of Rare Earths 2020年第5期38卷 474-482页

作者： Bo Zhou Qiqing Li Long Yan Qinynuan Zhang State Key Laboratory of Luminescent materials and devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniquesand Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSouth China University of TechnologyGuangzhou 510641China

Photon upconversion has received substantial attention owing to its great promise in broad applications from bioimaging to other frontier fields like display,upconversion laser,information security and anticounterfeiting.A smart control and manipulation of the upconversion luminescence has always been a key topic,however,to date the most efficient mechanism for upconversion nanoparticles remains the energy transfer upconversion and recently reported energy migration mediated upconversion.Recently,we found that the interfacial energy transfer(IET)is also an efficient approach for enabling and tuning photon upconversion of lanthanide ions.Moreover,it can be used for the mechanistic understanding of the interionic interactions such as energy transfer and energy migration on the nanoscale.In this review,the recent advances of the research on the IET are summarized,the principles for designing IET process and typical examples are discussed together with its applications in both mechanistic research and frontier information security.The challenges and perspectives for future research are also commented.

关键词： Photon upconversion Interfacial energy transfer Core-shell nanostructure Rare earth ions

Constructed TiO_(2)/WO_(3)heterojunction with strengthened nano-trees structure for highly stable electrochromic energy storage device

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Journal of Advanced Ceramics 2023年第3期12卷 634-648页

作者： Lili Zhao Zhuoan Cai Xiaoyang Wang Wenbo Liao Simin Huang Lingyun Ye Jilie Fang Chunxing Wu Hao Qiu Lei Miao School of Chemical Engineering and energy Technology Dongguan University of TechnologyDongguan 523808China Guangxi Key Laboratory of Information materials Engineering Research Center of Electronic Information Materials and DevicesMinistry of EducationSchool of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China guangdong provincial Key Laboratory of Distributed energy Systems Dongguan 523808China

Tungsten trioxide(WO_(3))has been widely regarded as a prospective bifunctional material due to its electrochromic and pseudocapacitive properties,while still facing the dilemma of inadequate cycle stability and trapping-induced degradation.Here,inspired by the trees-strengthening approach,a unique titanium dioxide(TiO_(2))nanorod arrays strengthened WO_(3)nano-trees(TWNTs)heterojunction was rationally designed and constructed.In sharp contrast to the transmittance modulation(ΔT)attenuation of primary WO_(3)nano-trees during cycling,the TWNTs film showed not only excellent electrochromic performance but also fascinating cycle stability(77.35%retention of the initialΔT after 10,000 cycles).Besides,the trapping-induced degradation could be easily rejuvenated by a potentiostatic de-trapping process.An electrochromic energy storage device(EESD)was further assembled based on the TWNTs film to deliver excellentΔT(up to 79.5%at 633 nm),fast switching speed(tc/tb=1.9 s/14.8 s),extremely high coloration efficiency value(443.4 cm^(2)·C^(−1)),and long-term cycle stability(over 10,000 charge/discharge cycles).This innovative study provided in-depth insights into the electrochromism nature and a significant step in the realization of stable electrochromic-energy storage application,paving the way for multifunctional smart windows as well as next-generation optoelectronic devices.

关键词： electrochromic(EC) WO_(3)nano-trees cycle stability TiO_(2)nanorod arrays(TiO_(2)NRAs) energy storage

基于CsPbIBr_(2)的全无机半透明器件的光伏性能与热致变色性能

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中国科学:材料科学(英文版) 2023年第8期66卷 3261-3270页

作者：葛锐赵亚洁江成玉郑捷元陈莉蓉郑洋徐刚肖秀娣 guangdong provincial Key Laboratory of New and Renewable energy research and Development Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China School of energy Science and Engineering University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Luminescent materials and devices South China University of TechnologyGuangzhou 510640China

光伏热致变色智能窗采用钙钛矿材料并结合其热致变色和光伏特性,既可调控不同温度下的太阳光透过率,又可将吸收的光能转化为可用的电能.在此,我们利用经过优化的后退火工艺设计了一个结构为氟掺杂氧化锡(FTO)/SnO_(2)/CsPbIBr_(2)/NiO_(... 详细信息

光伏热致变色智能窗采用钙钛矿材料并结合其热致变色和光伏特性,既可调控不同温度下的太阳光透过率,又可将吸收的光能转化为可用的电能.在此,我们利用经过优化的后退火工艺设计了一个结构为氟掺杂氧化锡(FTO)/SnO_(2)/CsPbIBr_(2)/NiO_(x)/铟锡氧化物(ITO)的半透明太阳能电池,在最佳条件下其平均可见光透过率为33.2%,光电转化效率为3.89%.同时,基于CsPbIBr_(2)的热致变色特性,我们发现当其由高温着色相转变为低温透明相时,器件的平均可见透过率可从33.2%提高至73.5%.此外,高温相向低温相的转变受湿度主导.当相对湿度从50%上升至90%时,钙钛矿相变时间从1005分钟大幅度下降至17分钟.然而,过高的湿度导致的过快相变会破坏钙钛矿的薄膜形貌和晶体结构,这将对CsPbIBr_(2)钙钛矿造成不可逆损伤.这项工作为半透明光伏和热致变色智能窗的应用提供了重要参考,并可预见这一领域将进一步助力降低建筑和汽车能耗.

关键词：光电转化效率可见光透过率热致变色智能窗光能转化钙钛矿不可逆损伤光伏性能