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    Home > Research group of Professor Yin panchao, Institute of soft matter, South China University of Technology: Study on polyethylene glycol polyoxometalate semi solid electrolyte

    Research group of Professor Yin panchao, Institute of soft matter, South China University of Technology: Study on polyethylene glycol polyoxometalate semi solid electrolyte

    • Last Update: 2019-08-03
    • Source: Internet
    • Author: User
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    Lead proton conductor materials are widely used in super capacitors, fuel cells and other energy fields, and have attracted people's attention How to develop proton conductor materials with low cost, high proton conductivity, safety and good mechanical properties is a difficult problem for researchers Recently, Professor Yin panchao, research group of South China Institute of soft matter science and technology, South China University of technology, realized the effective proton transfer through the polyethylene glycol polyacid three-dimensional network constructed by hydrogen bond The conductivity reached 1.01 * 10-2s cm-1 at 353K This proton conductor material also shows special pseudoplastic fluid behavior, which ensures its safety, processability and compatibility with electrode materials when used as electrolyte The results were published online in Chem SCI (DOI: 10.1039 / c9sc02779c) and selected as the inner cover of the magazine Prof Yin panchao's research group is devoted to the study of the structure-activity relationship of materials by means of polymer physics, especially X-ray and neutron scattering, the development of high-throughput material characterization means, the preliminary construction of material gene concept, and the realization of targeted design and preparation of materials At present, the research focuses on the application of nanocomposites based on cluster polymer in catalysis, gas separation, proton conductor and solid electrolyte materials The research team is mainly supported by the youth program of the national high level talent plan, the key R & D program of the Ministry of science and technology, the general program of the National Natural Science Foundation, the free exploration program of the Guangdong Natural Science Foundation, the business fees of the Central University and the start-up funds of the talent project construction of South China University of technology At present, the research group has 1 associate professor, 2 postdoctors, 8 doctors, 8 masters and 2 undergraduates Our group warmly welcomes postdoctoral, graduate and undergraduate students interested in polymer physics, nanocomposites, polymer chemistry and inorganic chemistry to join our family Prof Yin panchao, researcher of South China Institute of soft matter science and technology, South China University of technology In 2009, he graduated from the Department of chemical engineering of Tsinghua University with a bachelor's degree in engineering In 2013, he received his Ph.D from the Department of chemistry, University of Caspian From 2013 to 2015, he was engaged in postdoctoral research in the Department of polymer science, Akron University From 2015 to 2017, he served as a researcher in the Department of Neutron Science of Oak Ridge National Laboratory In 2016, it was selected into the 12th batch of national high level talent program youth projects Since 2017, he has been employed by South China Institute of soft material science and technology of South China University of technology as a special researcher Researcher Yin panchao has published 73 SCI journal papers In particular, since independence in 2015, Professor Yin panchao has published more than 20 papers in high-level magazines such as J am Chem SOC., nano lett., chem SCI., J Phys Chem Lett., chem Commun., chem EUR J as a correspondent The total SCI citations of the paper reached 2218 times, and the h-index was 24 (until July 2019) Cutting edge research results: the energy and environmental problems of polyethylene glycol polyoxometalate semi-solid electrolyte are a big challenge facing the contemporary society, and fuel cell, as a clean and efficient electrochemical power generation device, is an effective way to alleviate these problems As the core component of PEMFC, proton conductor material not only is the membrane of cathode and anode, but also carries the task of proton conduction An ideal proton conductor material should have high proton conductivity, good compatibility with electrode material, low weight, high toughness, high deformation and excellent processing performance (chem Rev 2007, 107, 3904-3951) Polyoxometalates (POMS) are a kind of molecular clusters with clear structure and nano size, which are mainly composed of metal oxygen polyhedrons As the transition region between small molecules and nano particles, sub nano clusters (mainly Lindqvist and Keggin type) have high specific surface area, catalytic efficiency, proton conductivity and good stability In order to improve the stability of polyacids, the Sayaka Uchida group of Tokyo University, Japan, put polyethylene glycol (PEG) into the pores of polyacids The resulting crystal complex can achieve a conductivity of 1.2 * 10-5 s cm-1 in a non wet environment of 443 K (J solid state chem 2016, 234, 9) At the same time, Professor Yin panchao's research team has proved by neutron scattering technology that PEG chain just acts as a bridge of proton transfer in this polyethylene glycol polyacid crystal composite The proton combines with the O atom of PEG, and the effective proton transfer is realized with the longitudinal movement of polymer chain (j.phys Chem Lett 2018, 9, 5772-5777) However, in this system, PEG chain is limited in the pore of POM crystal, which in fact greatly limits the movement of polymer chain The conductivity of the material is not high, and the proton conductor material does not retain its advantages of organic components, and its mechanical properties are poor In view of the above problems, in this paper, by reducing the crystallization energy of poly acid and its limiting effect on the polymer chain, the conductivity of the polyethylene glycol poly acid composite material is improved, and good mechanical properties and processability are guaranteed (Fig 1) Fig 1 performance diagram of polyethylene glycol polyacid nanocomposites (source: chem SCI.) the author took polyethylene glycol polymer (PEG400) with molecular weight of 400 as the substrate, dissolved phosphotungstic acid (PW12) in it, and obtained transparent and stable polyethylene glycol polyacid nanocomposites (peg400-pw12) At the same time, the structure of the composite was characterized by small angle X-ray scattering (SAXS) (Fig 2) The results show that phosphotungstic acid retains its structural integrity in the peg substrate At the same time, when the concentration of tungstophosphoric acid is high, the crystal diffraction peak of tungstophosphoric acid is not observed in SAXS spectrum, which proves the uniform dispersion of PW12 in the substrate In addition, the structural factors obtained from SAXS data, i.e the distance between polyacids, were statistically analyzed to prove the existence of repulsion between phosphotungstic acids Fig 2 SAXS data of polyethylene glycol polyacid composite (source: chem SCI.) in terms of performance, the author tested the conductivity of peg400-pw12 samples with different polyacid specific gravity (Fig 3) The results show that the conductivity of the composite increases with the increase of the proportion of polyacids With the increase of temperature, the conductivity also increased Among them, the conductivity of peg400-70% PW12 sample can reach 1.01 * 10-2s cm-1 at 353K, which is close to the current commercial proton conductor material Through the analysis and comparison of the activation energy in the process of proton conduction, the author found that in this composite, the movement of polymer chain finally achieved the effective proton transfer, and further verified the results obtained from the neutron scattering data Fig 3 electrical conductivity characterization of polyethylene glycol polyacid electrolyte conductor material (source: chem SCI.) it is worth mentioning that the mechanical properties of the polyethylene glycol polyacid nanocomposite material (Fig 4) Through rheological data and infrared data, we found that there is hydrogen bond between PEG and poly acid, which makes the sample have special shear thinning behavior when the proportion of poly acid is high (peg400-70% PW12) Specifically, the viscosity of peg400-70% PW12 is relatively high (273 PA s) at static or low shear rate, and the sample shows solid state property and does not have fluidity, thus ensuring its safety as an electrolyte At high shear rate, the viscosity of the sample is low, about 100-10 PA S peg 400-70% PW 12 has fluidity, which ensures its processability and compatibility with electrode materials Fig 4 mechanical properties of polyethylene glycol poly acid composite (source: chem SCI.) this work has been published on chemical science recently and selected as the inner cover Zheng Zhao, a doctoral student of the research group, is the first author of this paper Zhou Qianjie, a doctoral student, is responsible for part of the electrochemical performance test of the material Li Mu, a doctoral student, is responsible for small angle X-ray scattering test of the material, Professor Yin panchao is the corresponding author This work has been supported by the national key R & D plan, Guangdong Natural Science Foundation and the Central University business fee outstanding project Bl16b1 provides strong support for SAXS test of samples Nowadays, people and scientific research have been paid more and more attention in the economic life China has ushered in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information website, chembeangoapp, chembeango official micro blog, CBG information wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the representative research groups in China, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.
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