Day :
- Advanced Energy Materials | Advanced Nano Materials | Hydrogen Energy and Fuel Cell technology | Solar Energy Materials | Polymer Energy Materials
Location: Webinar
Session Introduction
Leire Zubizarreta
Instituto Tecnológico de la EnergÃa (ITE), Valencia, Spain
Title: Effect of NASICON/PVdF based hybrid solid electrolyte composition on the electrode/electrolyte interface properties of Solid-State Lithium Batteries
Biography:
Leire Zubizarreta Sáenz de Zaitegui is bachelor’s in chemistry by the University of Basque Country in 2004. PhD in Chemistry by the University of Oviedo in 2009. She carried out the PhD thesis in INCAR-CSIC research center in Oviedo. Author and co-author of more than 20 contributions in recognised international journals and author of two patents related to materials for energy applications.
Abstract:
Massive research activities have been initiated in order to solve different issues of solid state batteries, specially centred in solid electrolyte development. However, in spite of the good performance of solid electrolyte as such the interfacial contact of solid electrolyte with the electrode active materials is a serious challenge. Important parameters are based on interface impedance and electrochemical and mechanical stability with electrode materials. In order to guarantee an acceptable lifetime and cycling stability of solid batteries, stable interfaces with high contact area are required between electrolytes and active materials. Among this, the mechanical stability of the cell components and interfaces represents a serious challenge for the lifetime of solid batteries. The low elasticity of some ceramic electrolyte materials, in particular oxide electrolytes may not allow for external pressing. Differently, the easily processable polymer electrolytes are already applied with success in lithium metal batteries but must operate at elevated temperatures (above 60 °C) due to ionic conductivity limitations. The development of hybrid electrolytes comprising ceramics and polymers might be the ultimate solution to achieve the required interfacial properties in solid-state batteries.In this study, the effect of composition of NASICON/PVdF based hybrid solid electrolyte on graphite electrode/solid electrolyte has been studied. For that, different solutions containing different NASICON/PVdF ratio has been prepared and deposited over graphite electrodes by casting method. The electrode/solid electrolyte interfacial properties have been characterized using electrochemical techniques such as linear sweep voltammetry for the determination of electrochemical stability at the interface and electrochemical impedance spectroscopy for the determination of interfacial resistance. The results obtained show that, the combination of ceramic type electrolytes with PVdF-HFP based polymer electrolyte could be a promising alternative to achieve balance properties at interface by improved ionic conductivity given by ceramic electrolyte and better mechanical stability given by polymer electrolytes.
Shi Yong, M.E
Inner Mongolia Univ Technol, China
Title: Batteries Ultrasonic surface treatment-A novelty method on improving durability of cementitious materials
Biography:
Shi Yong has his expertise in improving the durability of cementitious materials. He focus on to present a low cost and long-lasting method to improve the durability of cement mortar and concrete. Now he present the ultrasonic surface treatment(UST) in this paper after 7 years researchs, which has positive effect on durability performance of cementitious materials. It also has some advantages on absorption of solar radiation, it will be a promised method on Infrastructure engineering.
Abstract:
Cement industry consumed about 12-15 % of the total industrial energy use and discharge 7 % of total worldwide CO2 emissions annually. However, owing to the porous microstructure, the durability of cementitious materials (cement paste, cement mortar, concrete) is still a big issue. Much methods has been presented and studied to improve the microstructure of cementitious materials, but that always caused extra expense and lead to dramatic increase in project cost. To overcome the contradiction between durability and costs, we present a novelty method named Ultrasonic surface treatment (UST) method, which with few extra costs and has positive effects on improving the durability of cementitious materials by improving its microstructure. According to our recent works, the UST method leads to the forming of a unique skin named Ultrasonic Harding Layer (UHL), which is significant different from conventional concrete skin in microstructure. The UHL is about 1-2 mm in thickness, with higher density and lower porosity, higher surface hardness and lower penetration, and also a non-defective ITZ (interfacial transition zone) was found in UHL, which can notably to improve the durability of cementitious materials. Besides, the cementitious materials treated with UST method appear in a deep color on surface. For concrete, it has a lower light reflectance than conventional concrete, consequently, it will be a promised method of road concrete on wear resistance and ice melting performance.
Jayati Sarkar
Department of Chemical Engineering, Indian Institute of Technology, India
Title: Dewetting assisted self-assembly/ origami formation and folding of graphene particles
Biography:
Dr. Jayati Sarkar acquired her Bachelor of Chemical Engineering degree from Jadavpur University, Kolkata in the year 2000, M.Tech in Chemical Engineering from IIT Kanpur in the year 2001 and PhD in Chemical Engineering from IIT Kanpur in the year 2005. In PhD her research work was in the field of instabilities in thin soft elastic films and the phenomena that occur there namely adhesion, debonding, dewetting and pattern formation.
Abstract:
All the unique properties of graphene, which make it, such an invincible material stems from its unique structure, which because of its flexibility can be morphed into different origami forms by application of external forces. The properties of controllable folding and unfolding of graphene can be useful in creating actuators. Whereas 3D stacking can improve the optical, electrical properties many fold and all this can be achieved by virtue of stress engineering of the underlying supporting material. In our present work we try to achieve this with the help of a simple dewetting force. Upto now nanoparticle laden polymeric films are only found to arrest dewetting. However, if such a film be cast where the concentration of the graphene particles vary throughout the lateral length, the dewetting started from the lean particle-concentraton zones is seen to force the graphene particles on the extreme other zone to self-assemble. Moreover, the concentration difference of the particles also lead to Marangoni forces which lead to nano-particle walk-offs and tearing of the underlying film and folding of the graphene particles into graphene nano-ribbons. The work sheds light on the forces responsible for the evolution of different origami structures formed as a result of the underlying stress engineering without the aid of any high-end instrumentation or process. Since these self-assembled structures are formed over a bio-compatible polymer, the structures are anticipated will be instrumental in fabricating biosensor, super-capacitors, biomedical microfluidic devices and for other in vitro and in vivo applications.
Haojie FEI
Centre of polymer systems, Tomas Bata University in Zlin, Czech Republic
Title: Hollow structure in MnO2 wrapped sulfur microsphere to suppress the volume changes in lithium-sulfur battery
Biography:
Dr. Haojie Fei’s research interests focus on the electrochemical energy storage devices, especially on sueprcapacitores and their flexibilization. Recently, a new research direction on lithium sulfur batteries are carried out in UTB energy storage team, which is a promising candidate for advanced batteries in the future. The team has prepared several cathode materials for lithium sulfur batteries based on reduced graphene oxide, Mxene, MOF and other materials.
Abstract:
Statement of the Problem: Lithium-sulfur batteries are considered as a promising candidate for next-generation energy-storage devices due to their high theoretical energy density of 2600 W h kg-1 (sulfur cathode coupled with lithium metal anode). The sulfur cathode has a high theoretical specific capacity of 1673 mA h g-1. It is low cost and environmentally friendly. However, there are several challenges in sulfur cathodes before using in practical application such as low conductivity of sulfur and their intermediates, large volumetric expansion during lithiation and “shuttle effect” of soluble polysulfides.
Methodology & Theoretical Orientation: In this study, we have prepared sulfur microspheres with hollow structures by adding MWCNT. These hollow structures are able to provide space for the expansion of sulfur during the lithiation. Then, the sulfur microspheres were wrapped by MnO2 nanoflakes, which can strongly absorb the polysulfides to prevent from the “shuttle effect”. Moreover, carbonized polyaniline (PANI) separated reduced graphene oxide (RGO) was used as the conducting additives coupled with carbon black, which helps to build a light and conductive matrix. The characterization of electrode materials was performed by XRD, SEM, TEM and Raman spectroscopy. The electrochemical performance of assembled lithium sulfur batteries was measured by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. The effect of hollow structure in the sulfur microspheres on the electrochemical performance especially on cycling life was evaluated.
Findings: The hollow structure in the sulfur microspheres were obtained by adding MWCNT during the formation of sulfur. MnO2 shells were easily created by one-step oxidation. The hollow structure provides space for the expansion of sulfur during the charge/discharge, resulting in a better cycling stability.
Elif Vargun
Centre of Polymer Systems, Tomas Bata University in ZlÃn, TÅ™. T. Bati 5678, 760 01, ZlÃn, Czech Republic
Title: Metal-organic framework/CNT based self-standing electrodes for asymmetric supercapacitor
Biography:
Dr. Elif Vargun’s major is polymer chemistry and fabrication of nanomaterials in energy storage technology. She has the experience in controlled living polymerization techniques and has interest in the synthesis of sulfur/carbon composite based cathode materials and flame retardant polymer electrolytes for high energy density Li-S batteries. She is an assistant professor at Department of Chemistry, Faculty of Sciences, Mugla Sitki Kocman University in Turkey (13 articles, 95 citations, h-index 6). Since Sep 2018, she has gotten the postdoctoral researcher position at Centre of Polymer Systems of Tomas Bata University in Czech Republic. She is working on asymmetric supercapacitors at Sino-EU Joint Laboratory of New Energy Materials and Devices.
Abstract:
Statement of the Problem: Metal-organic frameworks (MOFs) have been used as electrode materials in energy storage devices due to the high specific surface area and various functionality [1]. Even though MOFs can offer high surface area, they usually exhibit low conductivity. The composite structures of MOFs with graphene and CNTs have been developed to improve the electrochemical storage capacity in batteries and supercapacitors [2,3]. In this work, the sandwich-like Mn-MOF/CNT and Co-MOF/CNT composite electrodes have been developed for asymmetric supercapacitor. Polyaniline coated CNT (PANI@CNT) and carboxylated CNT (c-CNT) were used for the fabrication of free-standing sandwich-like MOF/CNT composite paper. To achieve optimum porosity, the carbonization of the MOF/CNT composite materials was performed. The effect of carbonization process on energy storage performances of two different MOF/CNT based electrode materials were evaluated.
Methodology & Theoretical Orientation: The solvothermal synthesis of Mn-MOF was done by dissolving MnCl2.4H2O (6 mmol) and 2-hydroxyterephthalic acid (1.2 mmol) in DMF and then it was activated by removing the solvent under vacuum at 100ºC for 12 h. The same procedure was used for the synthesis of Co-MOF material by using CoCl2.6H2O (6 mmol). The sandwich like MOF/CNT based electrodes were fabricated by the formation of continuous layers of both modified CNT (PANI@CNT, c-CNT) and MOF suspensions with vacuum assisted filtration. The characterization of electrode material was performed by XRD, SEM, TEM, Raman and XPS techniques. The supercapacitor performance of the free-standing sandwich-like MOF/CNT composite based electrodes was compared by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. The effect of carbonization of active materials on the improved electrochemical storage capacity was also evaluated.
Findings: The purity and well-defined structures of Mn-MOF and Co-MOF were confirmed by XRD analysis and the obtained peaks agree well with the data in the literature.
Le Quoc Bao
Centre of Polymer Systems, Tomas Bata University in ZlÃn, TÅ™. T. Bati 5678, 760 01, ZlÃn, Czech Republic
Title: Metal-organic framework doped reduced graphene oxide and polyaniline composite electrodes for supercapacitor
Biography:
Dr. Le Quoc Bao’s major is material technology. He used to focus on the development of novel organic materials aiming to the energy applications Dye-Sensitized Solar Cells. He has the experience in conducting the polymerization process such as Atom Transfer Radical Polymerization and has interest in the investigation and development of portable devices using conducting polymers and the composites which will use them as their matrix. He is a lecturer at Department of Organic Materials, Faculty of Applied Sciences, Ton Duc Thang University in Vietnam. Since Sep 2018, he has gotten the postdoctoral position at Centre of Polymer Systems of Tomas Bata University in Czech Republic. He is working at Sino-EU Joint Laboratory of New Energy Materials and Devices. Recently, his research is focused on developed the materials with high working performance applied on supercapactior.
Abstract:
Recently, carbon-based materials such as graphene oxide or reduced graphene oxide (rGO) had been widely investigated as electrodes for supercapacitors (SCs) owing to their good electrical properties. However, drawbacks of carbon-based materials such as low specific area and hard to fabricate had hindered their applications. In order to solve these problems, researchers had concentrated on the composite materials which should combine the advantages of their components. Recently, polyaniline (PANI) have been acquired great attention as one of the potential materials for SCs application because of their good pseudo-capacitive performance as well as facile synthesis and low cost. However, PANI exhibited poor cycling stability through charge-discharge processes over long periods of time which restrain its application in SCs. In this study hybrid nanomaterial based on rGO and PANI will be prepared and electrochemical storage capacity will be enhanced by metal-organic framework (MOF). Since being introduced, the crystalline porous MOFs, in which metal ions and clusters are linked by organic units had required intensive attention from scientists. MOF materials exhibited high surface area, high stability, large pore volume and organic functionality which led to their potential application in electrochemical devices. Moreover, the availability of various kinds of metal ions and organic linkers has provided thousands of choice for MOF with many potential applications. The composite of rGO and PANI in this study will be conducted via in situ polymerization following by doping of MOF on this structure. The electrochemical properties of those composites will be studied via cyclic voltammetry (CV) and galvanostatic charge-discharge test to identify the effects of conductive polymers to the materials electrochemical properties.
Lijie Dong
Wuhan University of Technology, China
Title: All-Organic rechargeable battery based on Redox-Active Polymers
Biography:
Lijie Dong, PhD, professor, Wuhan University of Technology (WHUT). She got Ph D degree in WHUT in China (2004) and conducted research in Max-Planck Institute for Polymer Research in Germany. She worked at Cornell University as a visiting professor in 2014~2015. Dr. Dong’s research interest always focus on the polymer materials, multi-functional materials，and flexible intelligent materials. Up to now，Dr. Dong and her team have presided about 20 key research projects, and have published 120 papers in international journals，including Angew. Chem. Int. Ed., J. Am. Chem. Soc., Adv. Funct. Mater. J. Mater. Chem. A. The citation has been over 1600 times. Based on her outstanding research experience，Dr. Dong has been selected as National New Century Excellent Talents in Universities, High-level Talents in Hubei Province, etc.
Abstract:
All-organic rechargeable battery, a promising energy storage technology, has attracted more attention duo to eco-friendliness and sustainable. Especially, the versatile synthetic chemistry of organic electrode provides an opportunity to adjust the electrochemical performance. Recently, a large number of organic materials (including organic molecules and polymers) have been reported to be used as cathodes or anodes for all-organic rechargeable battery, unfortunately, most of them cannot provide redox capability when used in pairs owing to lacking of electrochemically compatible. Therefore, in order to obtain better battery performance, the development of organic anode and cathode materials which can be used in pairs with wide redox potential difference is the top priority of all-organic rechargeable battery research. Herein, an all-organic rechargeable battery based on p-type radical polymer polytriphenylamine-nitrogen oxygen radical (PTPA-PO) cathode and n-type - poly (1,5-anthraquinone) (P15AQ) anode is reported. Since the PTPA-PO and P15AQ operate at a quite high potential of 3.8 V and at a lower potential of 2.1 V (vs. Li+/Li), this all-organic rechargeable battery can output a discharge voltage of ~1.5 V. During the charge/discharge reactions, the electrolyte anions are doping/dedoping at the PTPA-PO cathode simultaneously with the association/disassociation of Li ions at the P15AQ anode. This all-organic battery rechargeable possess an initial discharge capacity of 72.8 mA h g−1 (70 % material activity) at 20 mA g-1 of current density, and exhibit superior rate capability and cyclability.
Mohamed El Saied
Egyptian Petroleum Research Institute, Egypt
Title: Sulfonated carbon-based catalyst derived from orange peel†as an efficient and recyclable heterogeneous catalyst for oleic acid esterification
Biography:
I am Muhammad Al-Saied Abdel Salam I work in the catalyst laboratory of the Egyptian Petroleum Research Institute. I am interested in preparing nanomaterials, using them as catalysts, and testing these materials in different reactions.
Abstract:
The future of oil-derived fuels, such as gasoline and diesel for use in the transportation and energy sectors, is unknown. The continuous dependence on the fossil fuel as a main source for energy, in which its combustion usually produces greenhouse and toxic gases (such as SO2, NOx and other pollutants), take part directly in causing the global warming and environmental pollution. In addition to declining crude oil supplies and political instability in the regions with large oil reserves, strict emission regulations are creating a need for alternative fuels. One of these alternative fuels is biodiesel. The main objective of this study is to develop efficient and environmentally benign heterogeneous catalysts for biodiesel production. For this purpose, a heterogeneous AC@SO3H catalyst was prepared by sulfonation of activated carbon by using sulfonic acid, and the prepared catalyst was tested for the esterification of oleic acid. Various techniques such as Xâ€ray diffraction, scanning and transmission electron microscopy, Brunauer–Emmett–Teller (BET) method, infrared spectroscopy, were employed for the characterization of the solid catalyst. Sulfonic acid group-loaded activated carbon was next explored as heterogeneous catalyst to produce biodiesel from oleic acid. Various reaction parameters, such as methanol/oleic acid molar ratio, catalyst dosage, reaction temperature and time were systematically investigated. The obtained SO3H-AC catalyst exhibited good catalytic performance in the esterification of oleic acid and also showed good reusability. The performance of SO3H-AC for biodiesel production from waste vegetable oils was additionally explored and high methyl ester yield achieved. Accordingly, SO3H-AC appears promising as an industrial catalyst for the one-step biodiesel production from low-grade feedstock’s containing high levels of FFAs.
Pranjala Tiwari
Thin Film Laboratory, IIT Roorkee, India
Title: Understanding the structure-property tunability of large area sputtered vertically aligned edge-enriched MoS2 sheets for supercapacitor energy storage application
Biography:
Pranjala Tiwari is currently working as a full time research scholar in Institute Instrumentation Centre at Indian Institute of Technology Roorkee, India. Her area of expertise includes thin film fabrication and applications, energy storage devices, supercapacitors and nanomaterials. She has completed her M.Tech in Nanoscience and Technology from Delhi Technical University in the year 2016. Her doctoral research is focused on the synthesis of functional nanostructured thin films for energy storage and energy conversion applications. She completed her B.Tech, in Electronics and Communications from RGPV University, Madhya Pradesh in the year 2013.
Abstract:
Insights into the fundamentals of structure-property relations is one of the most important key parameters, which can be utilized for tailoring numerous material properties such as electrical, optical, wettable and electrochemical for photonic, optoelectronic, energy storage and sensing devices. Herein, we report a controlled single-step, large area growth of highly crystalline MoS2 nanoflakes consisting of vertically grown edge exposed layers using DC magnetron sputtering technique. To understand a correlation between microstructural and material properties, we have been prepared the MoS2 of varying thickness (~1 nm – 440 nm). A number of standard characterization techniques such as XRD, XRR, FESEM, Raman spectroscopy, TEM, and XPS, which confirm the formation of vertically aligned nanocrystalline MoS2 films of different thicknesses. Surprisingly, the growth is readily achievable on a variety of insulating as well as conducting substrates and the growth mechanism is discussed in detail. Wettability results manifest that our films could be tuned by varying the layer number as well as the exposed edge sites. We have further made an attempt to augment our prevailing understanding on structure-property relations of MoS2 in order to provide large tunability in the electrical properties. The MoS2 electrical resistance was observed in the range of 15 kΩ – 98 MΩ and displayed an inverse relationship with the number of layers. Further, we have carried out the charge storage measurements and found the three-electrode cell capacitance to be 5.48 mF/cm2 at scan rate of 10 mV/s.
Tingkai Zhao
Northwestern Polytechnical University, China
Title: Preparation and performance of carbon dot stabilized copper sulphide/carbon nanotubes hybrid composite as supercapacitor electrode materials
Biography:
Dr. Tingkai Zhao is currently working as a full professor in School of Materials Science and Engineering of Northwestern Polytechnical University (NPU) and has accomplished his PhD degree from Xi’an Jiaotong University (XJTU) in 2005, China. He has visited Northwestern University (Evanston, USA) and University of Oxford (Oxford, UK) as a visiting scholar. As a director of NPU-NCP Joint International Research Center on Advanced Nanomaterials & Defects Engineering, the vice-director of Shaanxi Engineering Laboratory for Graphene New Carbon Materials & Applications. His research group mainly investigates the synthesis, structure and performance of advanced carbon materials such as carbon nanotubes (especially amorphous carbon nanotubes), graphene, flexible graphite, 2D nanomaterials, MXene and their applications in composites, energy conversion (solar cell, supercapacitor and Li-ion batteries), smart device and biosensors. He has published 2 kooks, 15 Chinese Invention patents and more than 110 academic articles on SCI journals, and also obtained more than 25 Awards and Honors such as the first prize of Shaanxi Science and Technology Awards in 2013 etc., and 4 times scientific reports in《China Science Daily》newspapers for his research achievements. And he has also been elected as a commissioner of Shaanxi Society of Nano science & Technology and Xi’an Society of Nano science & Technology.
Abstract:
Carbon dot stabilized copper sulphide/carbon nanotube (CD@CuS/CNT) hybrid composite was synthesized by a simple one-pot hydrothermal reaction at 180℃ using copper sulphate and sodium thiosulphate as Cu and S sources. The microstructures and morphologies of hybrid composites were characterized by X-ray diffraction (XRD), Raman spectroscopy (Raman), scanning electron microscope (SEM) and transmission electron microscope (TEM). Moreover, a high-performance asymmetric supercapacitor device was assembled to improve the electrochemical performance of CuS as well as carbon based supercapacitors1. The CD@CuS/CNT hybrid composite exhibited a maximum specific capacitance of 736.1F•g-1 at the current density of 1A•g-1. Furthermore, the CD@CuS/CNT hybrid composite showed good cycling stability with more than 92% capacitance retention after 5000 cycles. These excellent results suggested that CD@CuS/CNT hybrid composite has promising application potential for supercapacitors2.