Day 1 :
IMDEA Energy Institute, Photoactivated Processes Unit, Av. Ramón de la Sagra 3, 28935 Móstoles, Spain.
Keynote: Hybrid Organic-Inorganic Photoanodes Based on Conjugated Porous Polymers Prepared by Electropolymerization
Time : 10.00-10.40
Artificial photosynthesis by photoelectrocatalysis is one of the most promising waysto store solar energy in the form of fuels, thus constituting a sustainable alternative to fossil fuels. The photoelectrodes used in this technique have to be designed according to the optoelectronic properties of their components in order to direct charge carriers to the reaction sites (minimizing electron-hole recombination), increase light absorption and/or promote catalysis on their surface.1,2 Conjugated polymers (CPs) are used as part of some photoelectrodes due to their good conductivity and the possibility to tailor their optoelectronic properties at the molecular level. Some of the most used CPs, such as PEDOT, have a linear structure; which makes them easy to process as thin films, but also unstable under UV illumination if they are in contact with water.3 This fact limits their use to buried junctions in well protected photoelectrodes. On the other hand, Conjugated Porous Polymers(CPP)3–5 show higher stability due to their 3D structure, which makes them promising and still untapped materials for artificial photosynthesis. However, it is difficult to produce thin films with them by conventional methods such as drop casting or spin coating because of their morphology. Thanks to the electropolymerization process, we are able to prepare homogeneous, transparent and light-absorbing CPP films both on conducting glass substrates and on inorganic semiconductors such as BiVO4 or TiO2. One of these CPPs, IEP-19, has been synthesized for the first time and it shows promising photocurrents, which are significantly higher than those of a previously known CPP with a similar structure: CPP-3TB. Moreover, hybrid photoanodes where the CPP is electropolymerized on top of the inorganic semiconductor present higher photocurrents than the semiconductors alone, showing a synergistic effect between the organic and inorganic semiconductors. In order to further improve the photoresponse of the hybrid photoanodes, samples with different oxide thicknesses where studied. Finally, optimal thicknesses were reached. All these results will be explained according to the optical, photoelectrochemical and morphological properties of the photoanodes
Sultan Moulay Slimane University, Laboratory of Chemistry and Environnement, Khouribga 25 000, Morocco
Time : 10-40-11.20
ASMAA HRIOUA, studied Analytical Chemistry and Environment at Mohamed V University , Rabat, Morocco, holds a master's degree in collaboration with University Paul Sabatier in Toulouse, France. Currently I am a phD student in the laboratory of Chemistry and Environnement at the Sultan Moulay Slimane University, Morocco, with research group of Prof. Moulay Abderrahim El Mhammedi (they has published more than 90 research articles in SCI(E) journals.)
Amoxicillin (AMX) is among the most successful antibiotics used for human therapy. It has a particular importance due to their effective against a wide spectrum of bacterial infections. In the recent years, the interactions between amoxicillin and metal ions have special interest due to their potential applications. It has been demonstrated that amoxicillin interact effectively with several metal ions due to the presence of a number of donor sites as several O- and N-containing functional groups in its chemical structure. Many studies have reported metal-AMX complex formation using spectroscopic and thermal methods. However, no electrochemical studies of the effect of metal ions on the redox chemistry of AMX have been reported.
In this work, the reaction of AMX with transition metals such as Cu(II), Zn(II) and Fe(III) has been investigated electrochemically at graphite electrode (CPE) in phosphate buffer solution (PBS ; pH = 7). This interaction was investigated using square wave voltammetry (SWV). The electrochemical results proved that the oxidation processes of amoxicillin could be affected by transition metals complexation. The formation of Metal-AMX complexes was examined by SWV and the observed results were confirmed using UV-visible spectroscopy.
Department of Chemistry, Deva Matha College, Kuravilangad, Kerala, India 686633
Tony Thomas has completed his PhD at the age of 27 years from Manipal University, Manipal. He is an assistant professor of chemistry, at Deva Matha Collge, Kuravilangad, Kerala, India 686633. He has published 12 papers in reputed journals and has a teaching experience of five years at undergrauate level.
Nanoplatelets of graphene (Gr) were obtained by the thermal exfoliation of graphite oxide prepared by modified Hummers and Offeman method. Nickel Oxide (NiO) nanoparticles of crystallite size 6.1 nm with a porous structure was synthesised by solution combustion method (SCS). Carbon paste electrode (CPE) is a homogeneous mixture of graphite powder and silicone oil. CPE was bulk modified with Graphene and NiO nanoparticles (MCPE/Gr/NiO) for the selective detection of dopamine (DA) in presence of interfering molecules such as ascorbic acid (AA) and uric acid (UA). MCPE/Gr/NiO electrode is 100% insensitive to AA signals below 1.0 × 10−3 M which enabled to carry out the quantification of DA accurately in presence of 1000 fold excess of AA. The fabricated electrode shows good reproducibility, stability and linear dynamic range of 0.2 − 300 µM. Detection limit of DA at MCPE/Gr/NiO is 1.6 × 10-7 M.
School of Materials Science and Engineering,China.
Dr. Ambrish Singh is working as Professor in School of Materials Science and Engineering, Southwest Petroleum University, China. He is leading the Corrosion Research Group (CRG) with master students, Ph.D. students and post doc researchers. His research interests are mainly focused on corrosion, electrochemistry, green chemistry, quantum chemistry, smart coatings, polymers, nano-materials, composites, and petroleum engineering. He got the prestigious Sichuan 1000 Talent Award from the Sichuan government, China for his outstanding research contributions as a faculty. He got the President’s Award for exceptional post doctoral research work. He also received the Young Scientist Award from UPCST, Lucknow, India. He has published more than 100 SCI peer-reviewed research papers in high impact journals. He is acting as reviewer for more than 40 high impact journals and editor for few journals. He is included as board member in several journals due to his contributions in the field of corrosion. Dr. Singh has been invited to present his work in several national and International conferences, seminars and workshops. He is the author of several book chapters and he is the editor of a book which is ready to be published by Intech publishers, London, United Kingdom. He has drafted five patents based on his new and innovative findings. He has finished several state and provincial projects in China and India. He is the member of NACE (National Association for Corrosion Engineers, Houston, USA) and American Chemical Society (ACS). He is having a good collaboration with other corrosion groups in Saudi Arabia, Germany, South Korea, United Kingdom, Portugal, Italy and South Africa.
The use of electrochemical techniques is corrosion is very important as it helps to understand the mechanism at the electrode surface in a particular solution. Electrochemical impedance spectroscopy (EIS) is the most traditional method used in electrochemistry to determine the electrode behavior. Electrochemical impedance spectroscopy provides valuable information about the Nyquist, bode and phase angle plots together. EIS was used to determine the efficiency of some corrosion inhibitors in the corrosive solution. Scanning electrochemical microscopy (SECM), and scanning vibrating electrode (SVET) were used to detect the localized electrochemical behavior of the different metal samples. Various concentration of inhibitors were used to detect the changes in the electrochemical nature. These variations in presence of inhibitors were used to calculate the inhibition efficiencies of the inhibitors. The study was carried on for electrochemical frequency modulation (EFM) and electrochemical frequency modulation trend (EFMT). Further, the polarization tests (Tafel) were done to determine the corrosion rate and inhibition efficiency of the inhibitor.
City University of Hong Kong,Hong kong
As I finished my MS in Experimental Physics Electronics From the Xi’an Jiaotong University, Xi’an, Chia. My main research work has been related to Organic-inorganic hybrid, Perovskite thin film solar cell. Now I am 3rd year PhD student in City university of Hong Kong doing research on led-free perovskite, ferroelectric thin films for enrgy storage Capacitors. I have one Publication in ACS Applied Materials & Interfaces.
Competing the stable energy density with high efficiency against varying temperature of the lead-based ceramic capacitors is a big challenge for lead-free applications. Different approaches have been used to overcome this problem: multilayer structure with interface effect and defect engineering and microstructure control are best of them.
This study presents a ground-breaking strategy to improve the energy storage performance in BiSc-based lead-free ceramics thin films. Here we investigated the recoverable energy storage properties of rotator(110-textured) crystals of A-cations deficient 10BiScO3-90BaTiO3(10BSBT) thin films deposited on platinized-silicon(Pt-Si) substrate by using pulsed laser deposition (PLD) technique. It is revealed that the synergistic effects of (110)-textured (rotator effect) with the A-site vacancies got superior recoverable energy storage performance even double the reported morphotropic phase boundary(MPB) of 40BiScO3-60BaTiO3 epitaxial thin film(100%(100)-textured) with outstanding thermal stability and breakdown strength(BDS). The results indicate that the Wr of the (110)-strong textured with A-site vacancy of 10BSBT thin film increases linearly (up to ~28.8 J/cm3) and efficiency decreases slightly (97%-92%) with the increasing of electric field E(0.29-2.8 MV/cm) at 25oC, while Wr of ~25 J/cm3 remains nearly temperature independent in the range of 25oC to 200oC under the E of ~2.57 MV/cm with the weakly temperature dependent efficiency >80%. The stable energy density and breakdown strength against varying temperature is one of the best reported in lead-based thick/thin films ceramic capacitors with the highest efficiency according to the best of our knowledge.
University of the Western Cape,South Africa
University of the Philippines, Diliman, Quezon City, Philippines
Time : 15:00-15:30
Geoffrey Ray L. Nablo graduated cum laude in the University of the Philippines – Diliman with a BS Metallurgical Engineering degree. He obtained the top 4th palce in the Professional Metallurgical Engineer Licensure Exam held in the Professional Regulation Comission, Manila, Philippines. . He worked for three years as an engineer in a flash smelting furnace in the only copper smelting plant in the Philippines before proceeding to postgraduate studies. He finished his MS degree in Metallurgical Engineering at the age of 26 years from the University of the Philippines – Diliman.
Pyrite oxidation is the predominant source of acid mine drainage (AMD), which is one of the severe environmental impacts of mining. AMD destroys flora and fauna in the nearby ecosystem, and it causes grave health problems to the people. To further the understanding and help in the mitigation of AMD, this electrochemical study investigates the effect of different parameters on the rate of pyrite oxidation, while simulating the conditions in mine tailings ponds.
Open Cell Potential (OCP) and Electrochemical Impedance Spectroscopy (EIS) analysis were done using a three-electrode cell set-up. Polarization resistance obtained after fitting an electrical circuit to the EIS data was related to the rate of pyrite oxidation, while OCP was used to describe its oxidation mechanism. It was found out that the oxidation of pyrite by dissolved oxygen was the mechanism occurring in all the experiments, except when ferric and chalcopyrite were added. The parameter setting with the lowest relative oxidation rate were: electrolyte at pH 4, with no ferric addition, and with nitrogen purging; RDE at 400 RPM, with 10 % chalcopyrite addition, and 7 hours aging. Reaction orders calculated for the effect of ferric and hydrogen ions were equal to 1, while 0.5 was obtained for oxygen. Presence of chalcopyrite in the RDE caused the preferential oxidation of chalcopyrite instead of the pyrite due to their galvanic interaction. A thickening sulfur product layer as a result of aging resulted in a 9-fold decrease in the oxidation rate of pyrite.
University M’Hamed Bougara-UMBB-Boumerdes,Algeria
Passive protection of metal installations against corrosion is provided by coatings (organic or metallic) and paints. These limit the flow of aggressive elements by creating a physical barrier. Most of these coatings are not perfect and therefore the contact metal/corrosive medium is inevitable. The efficiency of anticorrosive paints is dependent on the intrinsic characteristics of the organic film (barrier effect), its adhesion (metal/paint interface), the presence of inhibitors or sacrificial pigments within the film of the painting.
The aim of this work is to propose primer based on a conductive polymer (polyaniline / lignin) and to evaluate its anti-corrosive performance when protecting carbon steel in a 1M HCl acid medium.
Conventional primers are based on zinc chromates, currently prohibited for environmental reasons, hence their substitution by zinc phosphate. three primaries are investigated in this study:
1. Conventional zinc phosphate-based primer, manufactured by the Algerian National Paintings Company (ENAP) and which is a reference set,
2. Primary without anticorrosion load for comparative purposes.
3. Polyaniline / lignin-based primer developed in this study,
The study of the corrosion behavior and the evolution of the protective power of these primers were carried out by an immersion test, and by stationary (polarization curves) and non-stationary electrochemical techniques (electrochemical impedance spectroscopy, test of cathodic delamination). These methods make it possible to demonstrate, on the one hand, the efficiency of the nature of the anti-corrosive used in the primary formulations on the protection performance of carbon steel against corrosion in acidic medium (1M HCl), and of on the other hand the solubility of the anti-corrosion charge in the chosen solvent system (dimethylformamide, xylene)
Institute of Organic Synthesis and Coal Chemistry of Republic of Kazakhstan
Yakha Vissurkhanova is a 1st year PhD student of Academician E. A. Buketov Karaganda State University. Since 2012 she has been working as Researcher at Institute of Organic Synthesis and Chemistry of Coal of Kazakhstan Republic. Her research activities are focused on the synthesis of metal-polymer composites, metal ferrites, and the investigation of their electrochemical reduction and electrocatalytic activity in electrohydrogenation of organic compounds. She has published more than 15 research papers in various reputed national and international journals.
The paper presents the results of an investigation into the electrochemical reduction of metal ferrites with the formation of iron-containing composites and their electrocatalytic activity in the electrohydrogenation of organic compounds. Samples of metal ferrites (CuFe2O4, NiFe2O4 and ZnFe2O4) were prepared by co-precipitation method without and with addition of polyvinyl alcohol as polymer stabilizer. The obtained samples were annealed at 500ºС, 700ºС and 900ºС for 2 hours in corundum crucibles with a closed lid. Their structural-phase changes and morphological features have been studied by XRD analysis and electron microscopy. It was found that all copper ferrite samples prepared without and in the presence of polymer are able to be reduced in electrochemical system on Cu-cathode in aqueous-alkaline catholyte at 30ºC with the formation of Cu0- and Fe0-containing composites with metal predominance depending on the annealing temperature. NiFe2O4 and ZnFe2O4 ferrite samples undergo electrochemical reduction only in the case of their synthesis in polymer solutions; the phase constitutions of resulting composites are also depended on the annealing temperature. Thus, it has been established that the content of both metals in the composites formed after reduction can be controlled, and that can be used in the additional selective extraction of these metals from their ferrites in metallurgical wastes. The resulting composites with reduced metal particles were used as electrocatalysts in electrohydrogenation of organic compounds. The high electrocatalytic activity of the CuFe2O4-based composites in acetophenone electrohydrogenation and low one for NiFe2O4-based composites were found, which is due to the structure of Fe-Ni particles formed.