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Selection of Functional Spacer Cations for Efficient 2D/3D Perovskite Solar Cells

CCS Chemistry 2023年第4期5卷 781-801页

作者： Dengxue Li Zhi Xing Xiangchuan Meng Xiaotian Hu Ting Hu Yiwang Chen College of Chemistry and Chemical Engineering Institute of Polymers and Energy Chemistry(IPEC)Nanchang UniversityNanchang 330031 National Engineering Research Center for Carbohydrate Synthesis Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal UniversityNanchang 330022 Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010 Department of Polymer Materials and Engineering School of Physics and Materials ScienceNanchang UniversityNanchang 330031

In recent years,perovskite solar cells(PSCs)have gone through unparalleled rapid expansion and become a candidate for solar *** various PSCs,though typical three-dimensional(3D)halide perovskite-based PSCs deliver the highest efficiency,they are subjected to severe instability,which constrains their *** comparison,two-dimensional(2D)PSCs have aroused widespread concern due to their superior *** that,2D/3D perovskite materials combining high efficiency and good stability have emerged as the times require,which are expected to bring about stable and efficient ***,this review focuses on selection of functional spacer cations for efficient and stable 2D/3D ***,the unique function of different spacer groups and the selection of appropriate spacer cations in 2D perovskites is summarized and ***,by selecting appropriate cations,the role of 2D perovskites is elaborated,including energy level regulation,ion migration suppression,defect passivation,residual stress release and improved *** addition,the preparation methods of 2D/3D perovskites are comprehensively ***,current challenges and future opportunities for the further development of 2D/3D perovskites for solar cells are discussed and prospected.

关键词： 2D/3D perovskites spacer cations high efficiency stability defect passivation

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Improving stability of MXenes

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Nano Research 2022年第7期15卷 6551-6567页

作者： Jizhou Jiang Saishuai Bai Jing Zou Song Liu Jyh-Ping Hsu Neng Li Guoyin Zhu Zechao Zhuang Qi Kang Yizhou Zhang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China Key Laboratory of Rare Mineral Ministry of Natural ResourcesGeological Experimental Testing Center of Hubei ProvinceWuhan 430034China Institute of Chemical Biology and Nanomedicine(ICBN) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringCollege of BiologyHunan UniversityChangsha 410082China Department of Chemical Engineering “National Taiwan University”Taipei 10617TaiwanChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials ScienceNanjing University of Information Science&TechnologyNanjing 210044China Department of Chemistry Tsinghua UniversityBeijing 100084China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai 200240China

Due to their superior hydrophilicity and conductivity,ultra-high volumetric capacitance,and rich surface-chemistry properties,MXenes exhibit unique and excellent performance in catalysis,energy storage,electromagnetic shielding,and life *** they are derived from ceramics(MAX phase)through etching,one of the challenges in MXenes preparation is the inevitable exposure of metal atoms on their surface and embedding of anions and *** the as-obtained MXenes are always in a thermodynamically metastable state,they tend to react with trace oxygen or oxygen-containing groups to form metal oxides or degrade,leading to sharply declined activity and impaired ***,improving the stability of MXenesbased materials is of practical significance in relevant ***,there lacks a comprehensive review in the literature on relevant *** help promote the wide applications of MXenes,we review from the following aspects:(i)insights into the factors affecting the stability of MXenes-based materials,including oxidation of MXenes flakes,stability of MXenes colloidal solutions,and swelling and degradation of MXenes thin-film,(ii)strategies for enhancing the stability of MXenes-based materials by optimizing MAX phase synthesis and modifying the MXenes preparation,and(iii)techniques for further increasing the stability of freshly prepared MXenes-based materials via controlling the storage conditions,and forming shielding on the surface and/or edge of MXenes ***,some outlooks are proposed on the future developments and challenges of highly active and stable *** aim to provide guidance for the design,preparation,and applications of MXenes-based materials with excellent stability and activity.

关键词： MXenes stability oxidation swelling and degradation shielding strategies

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Machine Learning-Assisted Pbat/Pga Films Degradation Prediction Model Based on Uv-Accelerated Aging Test

SSRN

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SSRN 2024年

作者： Jia, Zihan Li, Minglong Wang, Bo Li, Dongsheng Guo, Peng Lyv, Mingfu Wei, Zhiyong Sang, Lin Gao, Dali State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Polymer Science and Engineering Department of Polymer Science and Engineering School of Chemical Engineering Dalian University of Technology Dalian116024 China Research Institute of Chemical Industry Co. Ltd. Beijing100013 China School of Materials Science and Engineering Dalian University of Technology Dalian116024 China

Biodegradable plastic mulches (BPMs) possess great possibility as alternative materials for traditional non-degradable agricultural films. However, research on the degradation rate of biodegradable films remains relatively nascent, which is a crucial determinant in applications. The Ultraviolet accelerated aging method offers an effective approach to simulate the outdoor or field degradation in a shortened period. In this research, poly (butylene adipate-co-terephthalate)/poly (glycolic acid) (PBAT/PGA) films were prepared and subjected to UV-accelerated degradation (UAD) and natural environmental degradation (NED). The variation of performance parameters including haze, tensile strength, elongation at break and melting temperature were separately collected at varying degradation intervals. A high correlation between UAD and NED was achieved, indicating the prediction feasibility by using UAD test. Then, linear regression and machine learning algorithms were applied to construct prediction models. It is notable that the prediction model rooted in random forest algorithm displayed superior stability and high accuracy, achieving R2 values of 0.984 and 0.979 for the training and test sets, respectively. Moreover, the derived relationship between actual NED and predicted UAD days (R2=0.952) precisely predicted the film post-usage performance. Therefore, the establishment of degradation prediction model provides a fast-assessment method and an insight of the lifespan for PBAT/PGA films in agricultural applications. © 2024, The Authors. All rights reserved.

关键词： Prediction models

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Hydrogel derived from water hyacinth and pectin from banana peel as a membrane layer

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Materials Today: Proceedings 2023年 87卷 13-17页

作者： Elma M. Kadek Devi Ananda Saraswati N. Fransiska Afrida Simatupang P. Febriyanti R. Rahma A. Mustalifah F.R. Chemical Engineering Department Engineering Faculty Lambung Mangkurat University Jl A. Yani Km 36 Banajrbaru 70714 South Kalimantan Indonesia Magister Program of Chemical Engineering Faculty of Engineering Lambung Mangkurat University Jl. A. Yani KM 36 Banjarbaru 70714 Indonesia Doctoral Program of Environemntal Science Postgraduate Program Lambung Mangkurat University Jl Brigjen H. Hasan Basri Kayutangi Banjarmasin 70123 South Kalimantan Indonesia ReG) Lambung Mangkurat University Jl. A. Yani KM 36 Banjarbaru 70714 Indonesia

Hydrogels is a unique material that affordable to apply as a membranes layer. In tropical country, such as Indonesia there is easily found water hyacinth (a weed plant) which is potentially used for hydrogels materials fabrication due to high cellulose content. Carboxymethyl cellulose (CMC) from water hyacinth cellulose and banana peels pectin are used to produce hydrogel for ultrafiltration membrane. The aims of this study are to characterize the functionalization of CMC-pectin membrane with different ratio using Fourier transform infrared spectroscopy (FTIR) and to determines the morphology of its membranes structure. The CMC was synthesized from water hyacinth stems through carboxymethylation. The functionalization group of multiple CMC-pectin membrane ratio is domination with carboxyl group (COO-), carbonyl stretching and carbon group. Meanwhile, CMC-pectin 70:30 wt% ratio displays not smooth structure. There is a water hyacinth stems extracted cellulose fibre on the surface of hydrogel CMC:pectin membrane. In other hand, the addition of pectin in all ratio variation exhibit increasing contact angle number from 63.98° to 68.16° (0-30 wt% pectin). The existence of pectin from banana peels on hydrogel membranes contributes to increase hydrophobicity of hydrogel-membrane, in spite of the contact angle value is below than 90°. 2023 The Authors. All rights reserved.

关键词： Carboxymethylcellulose Hydrogel Membrane Peat water Pectin Water hyacinth

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Regulating Ni site in NiV LDH for efficient electrocatalytic production of formate and hydrogen by glycerol electrolysis

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Rare Metals 2022年第5期41卷 1583-1594页

作者： Lin Dong Guan-Ru Chang Yi Feng Xian-Zhi Yao Xin-Yao Yu Key Laboratory of Structure and Functional Regulation of Hybrid Materials Institutes of Physical Science and Information TechnologyAnhui UniversityMinistry of Education.Hefei 230601China School of Chemistry and Chemical Engineering Huangshan UniversityHuangshan 245041China Department of Polymer Materials and Engineering Academy of Chemical EngineeringHebei University of TechnologyTianjin 300130China Ningbo Research Institute of Ecological and Environmental Sciences Ningbo 315000China Energy Materials and Devices Key Laboratory of Anhui Province for Photoelectric Conversion Anhui UniversityHefei 230601China

Energy-saving glycerol electrolysis with lower potential than water spitting endows a promising way for the concurrent production of value-added formate and high-purity hydrogen. However, there is still lack of efficient electrocatalysts at both anode and cathode for glycerol electrolysis. Herein, we report the activation of Ni site in NiV layered double hydroxide(LDH) by electrochemical and N_(2)/H_(2) plasma regulations for boosting the activity of glycerol oxidation reaction(GOR) and hydrogen evolution reaction(HER), respectively. Specifically, boosted GOR performance with a low overpotential(1.23 V at 10 mA·cm^(-2)) and a high Faradic efficiency(94%) is demonstrated by electrochemically regulated NiV LDH(ENiV LDH) with elevated valence state of Ni site. In situ Raman spectrum reveals the generation of Ni(Ⅲ) species by electrochemical regulation, and the highly active Ni(Ⅲ)can be regenerated with the process of electrochemical oxidation. Additionally, the possible reaction pathway is speculated based on the in situ Fourier transform infrared spectroscopy(FTIR) and high-performance liquid chromatography results. The plasma-regulated NiV LDH(PNiV LDH) with lower valence state of Ni site exhibits outstanding HER activity, displaying a low overpotential of 45 m V to deliver 10 mA·cm^(-2).When employing E-NiV LDH and P-NiV LDH as anode and cathode electrocatalyst, respectively, the assembled electrolyzer merely needs 1.25 V to achieve 10 m A·cm^(-2) for simultaneous production of formate and hydrogen, demonstrating remarkable 320 mV of lower potential than water electrolysis.

关键词： Glycerol electrolysis Glycerol oxidation reaction Hydrogen evolution reaction NiV LDH Formate

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Multifaceted regulation of chiroptical properties and self-assembly behaviors of chiral fluorescent polymers

Aggregate

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Aggregate 2024年第6期5卷 435-446页

作者： Youling He Junqian Zhang Chaoyang Ma Junkai Liu Jingjing Guo Ting Han Rongrong Hu Bing Shi Li Ben Zhong Tang Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsGuangdong Provincial Key Laboratory of New Energy Materials Service SafetyCollege of Materials Science and EngineeringShenzhen UniversityShenzhenGuangdongChina College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhenGuangdongChina State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSouth China University of TechnologyGuangzhouGuangdongChina Key Laboratory of New Lithium-Ion Battery and Mesoporous Material College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhenGuangdongChina Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang LinkNanyangSingapore School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)ShenzhenGuangdongChina

The multifaceted regulation of the chiroptical properties and self-assembly behaviors of chiral fluorescent polymers is of great significance yet remains challenging to ***,a series of novel salen-based chiral fluorescent polymers with aggregation-induced emission and varied substitution manners were facilely and efficiently *** factors were systematically investigated on the chiroptical properties and self-assembly performance of these polymers,which include molecular structures,solvent environments,metal coordination,and liquid crystal(LC)*** change in the solvent composition can lead to diverse assembly morphologies of all these chiral polymers,from single-handed helical fibers,helical toroids or loops,to spherical structures,consequently leading to an aggregation-reduced circular dichroism(CD)*** polymers bearing salen units show highly selective and reversible coordination with Zn^(2+)and can also induce multiple responses in the absorption,luminescence,CD,and circularly polarized luminescence(CPL)of these chiral fluorescent polymers via a coordination-and dissociation-initiated self-assembly ***,a small amount of the chiral fluorescent polymer in can induce achiral nematic 4-cyano-4′-n-pentylbiphenyl(5CB)to form ordered chiral nematic LC phase with significant improvement in their CD and CPL *** absolute absorption and luminescent dissymmetry factors of the resulting supramolecular assemblies can reach the order of 10^(−1).

关键词： aggregation-induced emission chirality circularly polarized luminescence fluorescent polymers selfassembly

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Application of nanofluids in heat exchangers - A state-of-the-art review

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International Journal of Thermofluids 2024年 24卷

作者： Porgar, Sajjad Huminic, Gabriela Huminic, Angel Najibolashrafi, Roznaz Salehfekr, Somayeh Department of Chemical and Polymer Engineering South Tehran Branch Islamic Azad University Tehran Iran Transilvania University of Brasov Mechanical Engineering Department 29 Bulevardul Eroilor Brasov500036 Romania Department of Industrial Engineering Science and Research Branch Islamic Azad University Tehran Iran Department of Chemical Engineering Shahryar Branch Islamic Azad University Shahriar Iran

Heat exchangers are used extensively in a variety of industrial applications, such as power plants, air conditioning, refrigeration, the oil and gas, and petrochemical sectors. Air-cooled exchangers, plate heat exchangers, and tube heat exchangers are a few of its commonly utilized varieties. The usage of various nanofluid types in heat exchangers is covered in detail in the first section of the article, along with an explanation of the guidelines that govern the research. In the second part, the preparation methods of nanofluids are mentioned. The results of the researches demonstrated that temperature, particle count, type of base fluid, and nanofluid flow through the heat exchanger are the primary factors in enhancing the thermal characteristics of nanofluid;numerous researchers have concentrated on the two-stage approach. Finally, nanofluids were used in different heat exchangers and the results were summarized. © 2024 The Author(s)

关键词： Air conditioning

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MXene@c-MWCNT Adhesive Silica Nanofiber Membranes Enhancing Electromagnetic Interference Shielding and Thermal Insulation Performance in Extreme Environments

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Nano-Micro Letters 2024年第10期16卷 82-98页

作者： Ziyuan Han Yutao Niu Xuetao Shi Duo Pan Hu Liu Hua Qiu Weihua Chen Ben Bin Xu Zeinhom MEl-Bahy Hua Hou Eman Ramadan Elsharkawy Mohammed AAmin Chuntai Liu Zhanhu Guo Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People's Republic of China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026People's Republic of China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123People's Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China College of Chemistry&Green Catalysis Center Zhengzhou UniversityZhengzhou 450001People's Republic of China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18UK Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry Faculty of ScienceNorthern Border UniversityArarSaudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia

A lightweight flexible thermally stable composite is fabricated by com-bining silica nanofiber membranes(SNM)with MXene@c-MWCNT hybrid *** flexible SNM with outstanding thermal insulation are prepared from tetraethyl orthosilicate hydrolysis and condensation by electrospinning and high-temperature calcination;the MXene@c-MWCNT_(x:y)films are prepared by vacuum filtration *** particular,the SNM and MXene@c-MWCNT_(6:4)as one unit layer(SMC_(1))are bonded together with 5 wt%polyvinyl alcohol(PVA)solution,which exhibits low thermal conductivity(0.066 W m^(-1)K^(-1))and good electromagnetic interference(EMI)shielding performance(average EMI SE_(T),37.8 dB).With the increase in func-tional unit layer,the overall thermal insulation performance of the whole composite film(SMC_(x))remains stable,and EMI shielding performance is greatly improved,especially for SMC_(3)with three unit layers,the average EMI SET is as high as 55.4 *** addition,the organic combination of rigid SNM and tough MXene@c-MWCNT_(6:4)makes SMC_(x)exhibit good mechanical tensile ***,SMC_(x)exhibit stable EMI shielding and excellent thermal insulation even in extreme heat and cold ***,this work provides a novel design idea and important reference value for EMI shielding and thermal insulation components used in extreme environmental protection equipment in the future.

关键词： SiO_(2)nanofiber membranes MXene@c-MWCNT Composite film Thermal insulation Electromagnetic interference shielding

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A Range of Sustainable Lignin-Derived Phosphonamides: Achieving the Excellent Equilibrium between Crystallization, Mechanical Properties and Flame Retardancy of Biodegradable Polylactide

SSRN

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SSRN 2025年

作者： Li, Dongsheng Jia, Zihan Wang, Lizheng Li, Gengchun Usman, Humza Sang, Lin Wei, Zhiyong State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Polymer Science and Engineering Department of Polymer Science and Engineering School of Chemical Engineering Dalian University of Technology Dalian116024 China Department of Materials Science and Engineering College of Transportation Engineering Dalian Maritime University Dalian116024 China School of Materials Science and Engineering Dalian University of Technology Dalian116024 China Ningbo Institute Dalian University of Technology Ningbo315016 China

Against the background of practical application requirements and sustainable development, achieving an equilibrium between crystallization, mechanical properties and flame retardancy of polylactide (PLA) with a green strategy has been a challenge. Additionally, previous work lacked to explore the structure-activity relationship. Herein, four lignin-derived phosphonamides containing P-C and P-O-C bonds were synthesized and used to fabricate PLA composites. The crystallization behaviors, mechanical properties and flame retardancy of PLA composites were systematically compared, and the influence of phosphonamides structure on the flame-retardant mechanism was emphasized. DSC results showed that these phosphonamides act as nucleating agents as they significantly improved the crystallization capacity of PLA. Interestingly, phosphonamides containing P-C bonds are more effective than P-O-C bonds in accelerating the crystallization rate, increasing the nucleation density and reducing the crystal size. Beyond that, PLA composites maintain the outstanding mechanical properties, phosphonamides containing P-O-C bonds exhibited significant improvement. PLA composites with 6 wt% phosphonamides fulfilled UL-94 V-0 ratings and significantly enhanced LOI values. Phosphonamides containing P-C bonds endow PLA higher flame-retardant efficiency, while containing P-O-C bonds enable PLA higher LOI values. Flame retardant mechanism analysis suggests that phosphonamides with P-C bonds primarily act in the vapor phase, while containing P-O-C bonds act in the condensed phase. The flame retardancy of PLA composites is realized by the synergistic effects of drop away, free radical trapping, dilutive influence, and residual char. In summary, this research provides a sustainable strategy for the fabrication of PLA composites with outstanding overall performance, which exhibits a broad prospect in industry. © 2025, The Authors. All rights reserved.

关键词： Flame retardants

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Asymmetric side-chain engineering in semiconducting polymers: a platform for greener processing and post-functionalization of organic electronics

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polymer Chemistry 2022年第5期14卷 562-572页

作者： Mooney, Madison Nyayachavadi, Audithya Awada, Angela Iakovidis, Ekaterini Wang, Yunfei Chen, Mei-Nung Liu, Yuzi Xu, Jie Chiu, Yu-Cheng Gu, Xiaodan Rondeau-Gagné, Simon Department of Chemistry and Biochemistry University of Windsor ONN9B 3P4 Canada School of Polymer Science and Engineering The University of Southern Mississippi HattiesburgMS39406 United States Department of Chemical Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Nanoscience and Technology Division Argonne National Laboratory LemontIL United States

Organic semiconducting polymers are a powerful platform for the design of next-generation technologies due to their excellent optoelectronic properties and solution processability, allowing access to low-cost and scalable manufacturing techniques such as spin-coating, slot-die coating and roll-to-roll printing. However, their extended π-conjugation results in low solubility, requiring the use of toxic halogenated solvents to generate thin films and devices. Furthermore, accessible post-functionalization of semiconductors toward the development of multifunctional devices and sensors remains a challenge due to limited solid-state chemistry for alkyl side chains. In this work, an asymmetric side-chain engineering approach was used to introduce terminal hydroxyl moieties alongside traditional solubilizing branched alkyl chains into an isoindigo-based polymer. The hydroxyl moieties led to significantly improved processability in alcohol-based solvents without sacrificing electronic performance in thin film organic field-effect transistors. Solid state morphologies of the thin films processed from both alcohol-based and traditional halogenated solvents were further characterized using atomic force microscopy and grazing incidence wide angle X-ray scattering. Additionally, Cryo-EM was utilized in order to characterize the role of asymmetric side-chain functionality in solution state aggregation. The versatility of this design was further probed using fluorescein isothiocyanate to directly functionalize the asymmetric polymer in thin film. This facile solid-state post-functionalization further demonstrates asymmetric side-chain engineering to be a viable approach toward the development of sustainably manufactured multifunctional electronics. © 2023 The Royal Society of Chemistry.

关键词： Thin films

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