Wednesday Scientific Seminar to be held on 11 April

29/03/2018

Time:16:00-17:00

Place:TPOC-3, Nobel str., Blue Building, Room 408

Speaker: Dr. Moneim Ismail, senior research scientist with the Center for Electrochemical Energy Storage

Title: Under the Spotlight: The Rise of Organic-Inorganic Perovskite Solar Cells

Abstract: The power conversion efficiency of organic-inorganic perovskite Solar cells (PVKs) has soared from 3.8% in 2009 to a current world record of 22.7%. Perovskite materials not only show exceptional optoelectronic properties (such as tunable direct bandgaps, high optical absorption, and long charge carrier diffusion lengths), but they are also very attractive because of their easy processability from solution and large availability of their chemical components. Perovskite materials are a true alternative for silicon but still have to pass the long-term stability test. My talk will cover the rise of perovskite photovoltaics, and possible pathways to stabilize perovskite devices. In the last part of the talk, I will present our results of efficient n-i-p and p-i-n PVKs using interface-related approaches. By using metal oxide and new organic semiconducting interlayers, we fabricated PVK devices with power conversion efficiencies exceeding 17.

Speaker: Murat Sultanov, Center for Electrochemical Energy Storage

Title: SrCoO₃-δ perovskites for oxygen catalysis

Abstract: Oxygen deficient perovskite oxides ABO₃-δ are mixed ionic and electronic conductors (MIEC) and represent a playground to discover new catalysts for high temperature oxygen electrocatalysis and room temperature ORR/OER in alkaline medium. For example, SrCoO₃-δ based perovskites Sm_0.5Sr_0.5CoO₃-δ, SrCo_0.8Fe_0.2O₃-δ, La_0.6Sr_0.4Co_0.2Fe_0.8O₃-δ, Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃-δ, and SrNb0.1Co0.9O3-δ exhibit high activity in intermediate temperature solid oxide fuel cells. Moreover, Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃-δ (BSCF) was reported as an efficient OER catalyst in water electrolysis. In this presentation, key insights of activity descriptors and reaction mechanisms for water electrolysis will be discussed.

Upcoming Wednesday Scientific Seminars

18.04 Irina Klimovich and Sergey Tsarev

16.05 Visweshwar Sivasankaran and Meruert Karim

Time: 16:00 – 17:00

Place: TPOC – 3, Nobel str., Blue Building, Multifunctional Zone, Room 303

Tags: Dr. Moneim Ismail, Murat Sultanov, Wednesday Scientific Seminar

Join our Seminar on 7 March

05/03/2018

Time: 16:00-17:00

Place: TPOC-3, Nobel str., Blue Building, 3^rd floor, Multifunctional Zone, Room 303

Speaker: Nataliya Gvozdik, Skolkovo Institute of Science and Technology, Center for Electrochemical Energy Storage

Title: Development of Novel Type Fuel Cells Based on Carbon Monoxide-Tolerant Catalysts

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Abstract: Redox flow batteries have been recognized as promising energy storage devices with capacity up to 5 MWh due to independent power/energy sizing and long-cycle life. A crucial part of RFB is the membrane which separates the anolyte and catholyte containers (thus providing for charge carriers conductivity and preventing the cross-mixing of the redox-active components). The presentation provides a brief overview of membrane technology for RFB and proposes a new methodology for a modification of commercially available membrane to obtain the desired ion-selectivity.

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Speaker: Polina Morozova, Skolkovo Institute of Science and Technology, Center for Electrochemical Energy Storage

Title: Ionic liquids as electrolytes for potassium-ion batteries

Abstract: The high cost of large-sized lithium batteries makes the researchers look for alternative cathode materials based on other alkali metals, and potassium is considered as one of the possibilities. Aprotic ionic liquids with wide electrochemical stability window are one of the promising electrolytes for high voltage ion batteries, such as Na-ion, K-ion, Mg-ion batteries. Smaller reactivity at high voltages, high ionic conductivity are their main advantages over the conventional carbonate electrolytes. We will discuss about applicability and electrochemical stability of ionic liquids as electrolytes for K-ion batteries.

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Upcoming Scientific Seminars

28.03 Mikhail Gorbunov and Irina Gushchina

04.04 Meruyert Karim and Murat Sultanov

Time: 16:00-17:00

Place: TPOC-3, Nobel str., Blue Building, 3^rd floor, Multifunctional Zone, Room 303

Tags: Wednesday Scientific Seminar

Seminar to be held on 7 February

02/02/2018

Speaker: Valerii Okatenko, Skolkovo Institute of Science and Technology, Center for Electrochemical Energy Storage, Russia.

Title: Oxide materials with tetrahedrally coordinated d-metal as bifunctional catalysts for oxygen reduction and oxygen evolution reactions.

Abstract: Alkaline fuel cells are energy storage devices which store energy by decomposing water into hydrogen and oxygen (oxygen evolution reaction, OER,) and generate it by the oxidation of hydrogen producing water (oxygen reduction reaction, ORR). The practical application of these systems is hampered by slow kinetics of OER and ORR. This problem can be solved by usage of bifunctional catalyst, which is equally effective for both reactions. Modern catalysts (precious metals and complex d-metal oxides) have disadvantages, mainly related to their high cost and insufficient electrocatalytic efficiency of metal oxides in OER. Investigated oxide compounds usually have octahedrally coordinated d-metal in their crystal structure. Lattice-oxygen mediated mechanism (LOM), introduced by K. Stevenson’s group, is one of the proposed mechanisms for oxide catalysts OER and ORR and involves processes which include oxygen vacancies transformation.

That leads to the assumption that oxygen non-stoichiometry is desired feature of the catalyst’s crystal structure and can facilitate the processes of oxygen exchange. My work is aimed at the investigation of tetrahedrally-coordinated d-metal oxide materials as bifunctional catalysts. In particular, YBaCo4O7+δ and its derivatives are the point of focus, as the compound possesses high oxygen non-stoichiometry index (up to 1.5) and high electronic conductivity (σ ~ 2,5 S/cm at 50°C). Mainly the aspects of synthesis process will be covered in the talk.

Speaker: Daria Burova, Skolkovo Institute of Science and Technology, Center for Electrochemical Energy Storage, Russia.

Title: Microwave-assisted hydrothermal syntesis of NASICON-based cathode materials for Na-ion batteries.

Abstract: Na-ion batteries are a rapidly developing technology of electrochemical energy storage, which, in its commercial appeal, can be a worthy competition for the already widely used Li-ion technology. Microwave hydrothermal methods of the cathode materials synthesis with the NASICON-type structure Na3V2(PO4)2F3 (NVPF) and its derivatives are developed. The microwave hydrothermal synthesis was carried out with the Anton Paar Microwave reactor. The choice of this method is due to its ability to provide control over the chemical composition and microstructure of the product by varying a large number of experimental parameters. This will make it possible to obtain a range of materials with different morphological and microstructural characteristics. We succeeded in preparation of several cathode materials based on mixed vanadium sodium fluorophosphate Na3V2(PO4)2F3-xOx and solid solutions Na3V2-yMy(PO4) 2F3-xOx (M=Fe, Mn). In experiments we varied temperature (from 180 C to 220 C) and time (from 15 to 30 minutes). The obtained materials were characterized by various methods.

Date: February 7, 2018