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Item Open Access SOLUTION-PROCESSED SNO2 QUANTUM DOTS ELECTRON TRANSPORT LAYER FOR FLEXIBLE PRINTED PEROVSKITE SOLAR CELLS(National Laboratory Astana, 2022-08) Kakimov, Alibek G.; Kiani, Muhammad Salman; Sadirkhanov, Zhandos T.; Ng, Annie; Jumabekov, Askhat N.Flexible perovskite solar cells (PSCs) fabricated on lightweight plastic substrates have many excellent potential applications in emerging new technologies including wearable and portable electronics, the internet of things, smart buildings, etc. To fabricate flexible PSCs, all functional layers of devices should be processed at low temperatures. One of the best metal oxide materials to employ as the electron transport layer (ETL) in PSCs is tin oxide. One of the limitations of its use in flexible electronics is its high annealing temperature, which is unsuitable for heat-sensitive flexible substrates. Herein, the preparation and application of SnO2 quantum dots (QDs) as an ETL for flexible PSCs are demonstrated.Item Open Access DETERMINATION OF OPTIMAL SYNTHESIS CONDITIONS OF THE CU@PET COMPOSITES USING TAGUCHI ROBUST EXPERIMENT DESIGN(National Laboratory Astana, 2022-08) Mashentseva, Anastassiya; Zdorovets, MaximIn this task the Taguchi robust design was applied to optimize experimental parameters as well as to determine the optimal conditions for the electroless copper plating. Taguchi robust planning is widely used in the production and study of various technological processes and scientific research, including synthesis of nanomaterials and the study of their properties...Item Open Access LIMITATIONS AND CAPABILITIES OF MICRO-RAMAN SPECTROSCOPY. ELECTRODE MATERIALS FOR LITHIUM BATTERY(National Laboratory Astana, 2022-08) Ryabin, Alexander; Nikiforov, Alexei; Pelegov, DmitryRaman spectroscopy is an inexpensive and convenient tool for prompt structural characterization. Most research groups have access to confocal Raman microscopes with claimed submicron spatial and subsecond temporal resolutions. Raman spectroscopy is widely used in material science, solid- state chemistry, and electrochemistry. But this unique tool is often considered to be auxiliary to other methods and is commonly used as a “black box” without proper understanding of its limitations and capabilitiesItem Open Access BIOMASS-BASED BIOCHAR OBTAINED BY LOW-TEMPERATURE PYROLYSIS IN THE PRESENCE OF METAL OXIDES: PREPARATION, CHARACTERIZATION AND FUTURE APPLICATIONS(National Laboratory Astana, 2022-08) Aitbayeva, Aigerim; Uali, Aitolkyn; Shlyapov, Rustam; Vishnyakov, Alexey; Amerkhanova, ShamshiyaBiochar, which is material obtained from biomass by thermochemical decomposition, is an environmentally friendly replacement for carbon materials. Its applications range from heat and energy production, agriculture and livestock farming to analytical chemistry and analysis. This carbon-enriched material can be obtained by using microwave-assisted pyrolysis, hydrothermal carbonization, pyrolysis, and gasification, thus changing the product's structure and propertiesItem Open Access THE SOH AND THE SOC ASSESSMENT OF NCR18650 PANASONIC CYLINDRICAL BATTERY THROUGH THE ENTROPYMETRY(National Laboratory Astana, 2022-08) Serik, Yerkin; Adair, Desmond; Bakenov, Zhumabay; Uzakbaiuly, BerikAs the demand for the li-ion batteries increases in various areas, the precise and reliable assessment of the state of health (SOH) and the state of charge (SOC) of the battery become more important in the battery management system (BMS). The main goal of this research work is to create the model for the assessment of the SOH and SOC of the NCR18650 PANASONIC cylindrical battery based on thermodynamics parameters such as, enthalpy and entropy.Item Open Access EFFECT OF ACID ETCHING OF STAINLESS-STEEL FOILS IN RECHARGEABLE LITHIUM-ION BATTERIES(National Laboratory Astana, 2022-08) Maratova, Kamila; Konarov, Aishuak; Umirov, Nurzhan; Bakenov, ZhumabayResearch into rechargeable aqueous batteries is driven by the need for low-cost, high-safety batteries for large-scale energy storage applications. The effect of current collectors on battery performance is frequently disregarded, despite the fact that the majority of research efforts concentrate on creating electrolyte formulations and electrode materials.Item Open Access INVESTIGATION OF SURFACE CARBIDE LAYERS OF TUNGSTEN UNDER THE INFLUENCE OF HELIUM PLASMA(National Laboratory Astana, 2022-08) Miniyazov, Arman; Skakov, Mazhyn; Tulenbergenov, Timur; Sokolov, Igor; Stepanova, OlgaThe relevance of the research is caused by development of a fusion energy, where issues of surface modification of plasma-facing materials of the first wall and divertor of a fusion reactor are of great importance. Therefore, obtaining a reliable database on the properties of materials and other elements in contact with plasma, simulation of the plasma effect on their surfaces using an imitation installation are are highly relevant tasks of material research in modern physics when developing thermonuclear technology, including research at the Kazakhstani Material Testing Tokamak KTMItem Open Access SOL-GEL SYNTHESIS OF LIFEPO4 FOR LIB BASED ON LITHIUM CARBONATE FROM KAZAKHSTANI SPODUMENE FEEDSTOCKS(National Laboratory Astana, 2022-08) Zhanabayeva, Assem; Nalibayeva, Arailym; Zhumabayeva, Dinara; Abdykhalykov, ErlanLiFePO4 (LFP) cathode material with an olivine structure, in comparison with other cathode materials, has a number of positive properties, such as: high theoretical capacity and stability, low cost and environmental friendliness. The sol-gel method is one of the effective single-step methods for the production of LFP to control the structure of the electrode materials and provide a nanostructured homogeneous composition of the product particles. LFP was synthesized by sol-gel method from high-purity lithium carbonate obtained from spodumene raw materials of Kazakhstani deposits.Item Open Access FACTORS AFFECTING THE DESIGN OF HYDROGEN SEPARATORS BASED ON DENSEMETALLIC MEMBRANES(National Laboratory Astana, 2022-08) Pişkin, Fatih; Akyıldız, Hasan; Öztürk, TayfurPure hydrogen is needed for a number of applications; annealing furnaces, semiconductor processing, LED, photovoltaic manufacturing etc. Perhaps the most important in this respect is power generation via PEM fuel cells..Item Open Access EFFECT OF DOPING WITH CATIONS AND ANIONIC GROUPS ON THE IONIC CONDUCTIVITY PROPERTIES OF LATP SOLID ELECTROLYTES FOR LI-ION BATTERIES(National Laboratory Astana, 2022-08) Baltash, Yelnury; Mashekova, A.; Yegamkulov, M.; Trussov, I.; Mukanova, A.The good energy capacity of lithium-ion batteries (LIBs) makes them promising electrochemical energy storage devices. Existing commercial batteries use flammable liquid electrolytes, which are unsafe, toxic and environmentally unsound, and have poor chemical stability. Recently, solid Li-ion conducting ceramic electrolytes have received considerable attention, since they combine high ionic conductivity with low electrical conductivity, chemical stability and potentially sufficient mechanical properties.Item Open Access 3D PRINTING OF HIGH-PERFORMANCE ELECTRODES FOR ALL-SOLID-STATE RECHARGEABLE LITHIUM-ION BATTERIES(National Laboratory Astana, 2022-08) Nnwaogu, Emmanuel Chisom; Nurpeissova, Arailym; Kalimuldina, Gulnur; Bakenov, ZhumabayThree-Dimensional (3D) electrode architecture of lithium-ion batteries (LIBs) is a new generation energy storage system with high energy and high-power capacity to satisfy high consumer demands, especially for its application in biomedical, electrical vehicles, and portable electronics.Item Open Access BIOMASS GRAPHENE DERIVED FROM DATE SEEDS AS AN ANODE MATERIAL FOR LITHIUM-ION BATTERY(National Laboratory Astana, 2022-08) Tassybay, Kazna; Issatayev, Nurbolat; Kalimuldina, Gulnur; Nurpeissova, Arailym; Bakenov, ZhumabayLithium-ion batteries (LIBs) are in great demand as energy storage systems applied in wide range of electronic devices. However, currently used commercial anodes have a limited capacity of 372 mAh g -1. Therefore, development of novel carbon materials for high performance electrodes is of high interest. Recently, biomasses have attracted much attention as electrode materials for LIBs due to their low cost and environmental sustainability. In this research, a nitrogen-doped porous biomass graphene material was prepared from date seeds as an organic matter through carbonization and chemical activation.Item Open Access MICROWAVE-ASSISTED SYNTHESIS OF LISICON STRUCTURED LI3V2(PO4)3/ GRAPHENE COMPOSITE(National Laboratory Astana, 2022-08) Mukushev, Ilyas; Nurpeissova, Arailym; Kalimuldina, Gulnur; Bakenov, ZhumabayOne of the main challenges in cathodes at low temperatures (LT) is associated with low electronic and ionic conductivity. Graphene can be used to increase electronic conductivity, but most of the experimental methods for graphene composites require long-term high-temperature treatment and an inert atmosphere, which causes high energy consumption and cost increase. In comparison, microwave heating can simplify the reduction step of graphene oxide and provide a convenient, economical, and effective method of preparing graphene composites. LISICON structured Li3V2(PO4)3 (r-LVP) was reported to have enhanced LT performance due to high alkali- ion mobility and rhombohedral structure with the open framework.Item Open Access I-V CHARACTERIZATION OF P-N HETEROSTRUCTURES OBTAINED BY GLAD(National Laboratory Astana, 2022-08) Sarsembina, Madina; Turlybekuly, Amanzhol; Mentbayeva, Almagul; Soltabayev, Baktiyar; Bakenov, ZhumabayIn recent years, the development of gas monitoring devices/sensors are critical for environmental protection and for humans promptly. Due to their good characteristics as fast response, low cost, and small size gas sensors have become more prevalent in different fields from healthcare industries to food processingItem Open Access ENHANCING THE LOW-TEMPERATURE CHARACTERISTICS OF A LI/GRAPHITE HALF-CELL BY THE COMPREHENSIVE MODIFICATION OF ELECTROLYTE(National Laboratory Astana, 2022-08) Rakhatkyzy, Makpal; Nurpeissova, Arailym; Kalimuldina, Gulnur; Belgibayeva, Ayaulym; Bakenov, ZhumabayIn this work, a complex modification of the lithium salt and solvents was applied simultaneously to develop an optimal electrolyte system with improved low-temperature characteristics for the Li/graphite half-cell.Item Open Access LOW-TEMPERATURE PERFORMANCE OF SNXP/C COMPOSITE NANOFIBERS AS FREE-STANDING ANODE MATERIALS FOR LITHIUM-ION BATTERIES(National Laboratory Astana, 2022-08) Belgibayeva, Ayaulym; Rakhatkyzy, Makpal; Rakhmetova, Aiym; Kalimuldina, Gulnur; Nurpeissova, Arailym; Bakenov, ZhumabayGraphite anode is admitted as one of the critical limiting factors for applying lithium-ion batteries (LIBs) in low-temperature (LT) environments. As an alternative, tin compounds, such as SnO2, exhibit much better LT performance owing to the unique allotropic changes of tin and increased reversibility of lithiation-delithiation reactions at low temperaturesItem Open Access SNSE@POROUS CARBON NANOFIBERS AS A FREE-STANDING ANODE FOR LOW-TEMPERATURE LITHIUM-ION BATTERIES(National Laboratory Astana, 2022-08) Rakhmetova, Aiym; Nurpeissova, Arailym; Kalimuldina, Gulnur; Bakenov, ZhumabayTin selenide-based materials are considered to be promising high-capacity anode materials for Li-ion batteries (LIBs) owing to their non-toxicity, earth-abundance, and chemical stability. However, SnSe suffers from a large volume expansion, which leads to poor cycling performance. In addition, it lacks in-depth research on low-temperature electrochemical performance...Item Open Access GRAPHENE-LIKE POROUS CARBONS AS A SULFUR HOST FOR LITHIUM-SULFUR BATTERIES(National Laboratory Astana, 2022-08) Sultanov, Fayil; Mentbayeva, Almagul; Kalybekkyzy, Sandugash; Danebayev, Askhat; Zhaisanova, Azhar; Bakenov, ZhumabayLithium-sulfur batteries (LSBs) are recognized as the next generation energy storage systems due to their high theoretical capacity of 1675 mAh g-1 and energy density of 2600 Wh kg-1. However, such disadvantages as low sulfur electrical conductivity, polysulfides shuttle effect and volume expansion are limiting their practical application.Item Open Access IMPACT OF SUBSTRATE SURFACE PREPARATION METHOD ON SEI FORMATION REGULARITIES DURING ELECTROCHEMICAL DEPOSITION OF LITHIUM(National Laboratory Astana, 2022-08) Ryabicheva, Margarita; Kurbatov, AndreyThe use of lithium metal as an anode for batteries has undeniable advantages because this metal has the most negative reduction potential and the highest theoretical specific capacity. The reduction of lithium metal initially involves processes of solution components decomposition with the formation of SEI - a film of interfacial electrolyte, under which lithium is further deposited. Reversible lithium deposition requires it to have pure ionic conductivity and high mechanical strength.Item Open Access ON ELECTROCHEMICAL ACTIVITY OF ZN2(EDTA)(H2O) IN AQUEOUS SODIUM-ION BASED ELECTROLYTES(National Laboratory Astana, 2022-08) Starodubtseva, Alena; Trussov, Ivan; Galeyev, Alina; Kurbatov, AndreyMetal-organic frameworks (MOFs) are a class of compounds consisting of metal ions or clusters coordinated to organic ligands to form one-, two-, or three-dimensional structures. Due to their high porosity and excellent adsorption and catalytic activity, as well as the ability to simultaneously implement different charge accumulation mechanisms (ions de/intercalation and adsorption/desorption), they can be considered as electrode materials for metal-ion batteries. However, a significant drawback is that most MOFs have low conductivity, and the obtaining of conducting MOFs is a costly, time-consuming and technically difficult process.