9 research outputs found
SYNTHESIS OF Na-Y NANOZEOLITE ON GLASSY CARBON BY SEEDING METHOD
No full textNanozeolite synthesis was carried out through seeding method, in which the seed was Y zeolite (member of faujasite,FAU, family) using tetraethyl orto silicate (TEOS) as silica source, and aluminium isopropoxide Al[(CH3)2CHO)]3 asaluminum source, and tetramethylammoniumhydroxide (TMAOH) as template, under hydrothermal condition. Theseeds then were grown on glassy carbon (GC) sheet, that prior being used was modified, using layer by layer (LbL)technique, with three layers of polyelectrolytes: Poly(diallyldimethylammoniumchloride), PDDA; Poly-4-sodiumstyrenesulfonate,PSS; and PDDA again. The seeded GC sheet then was immersed into colloidal suspension with molarcomposition as follow: 14Na2O: Al2O3: 10SiO2: 798H2O: 3Na2SO4 and the pH of the suspension was kept at 9,0 beforewas treated hydrothermally for 20 hours at 100 oC. The variation on number of seed layers on GC (1, 2 and 3 layers),observed by SEM, showed that homogenous structure and crystal size was obtained with 1 layer of seeds applied on thesurface of glassy carbon. When more layers of seeds applied, the agregation and intergrowth of zeolite crystals in thethin film of zeolite became more visible. XRD pattern of the as-prepared thin film zeolite indicates that the zeolite hasnanoparticle structure. Furthermore, the pattern of glassy carbon predominated the XRD pattern and covered the patternof Y-zeolite. On the other hand, XRD of as prepared bulk Y-zeolite shows structure of FAU framewor
PREPARATION OF ELECTROCHEMICALLY IMMOBILIZED IRON ON THIN FILM FAUJASITE-NANOZEOLITE MODIFIED GLASSY CARBON
Get PDFPREPARATION OF ELECTROCHEMICALLY IMMOBILIZED IRON ON THIN FILM FAUJASITE-NANOZEOLITE MODIFIED GLASSY CARBON. Metal iron that electrochemically immobilized on thin film faujasite type of nanozeolite (FAU-nanozeolite) grown on polyelectrolyte (PDDA, PSS, PDDA layers) modified glassy carbon has been prepared. Thin film of FAU-type nanozeolite was synthesized using seeding method. The seeded modified-glassy carbon then was immersed in FAU colloidal suspension at 100 oC for certain period. XRD patterns of the seed and as-synthesized zeolite powder have similarity with the patterns from standard NaY zeolite. SEM images of thin film nanozeolite also show the appearance of crystals with homogeneous size of about 100 nm) of the nanozeolite thin film. However, it can also be seen that the crystals actually consist of smaller particles with size < 100 nm. The EDS mapping of the surface indicates that after electrochemical treatment, the surface of thin film consists of about 0.30% (w/w) iron that spread evently both on the surface covered by nanozeolite thin film and that from modified glassy carbon
Membangun bangsa cerdas : Kontribusi pemikiran ilmuwan AIPI
No full textFrasa “mencerdaskan kehidupan bangsa” sudah tidak asing bagi bangsa Indonesia, karena merupakan bagian dari tujuan kemerdekaan, yang tertuang dalam alinea keempat Pembukaan UUD 1945. Sepenggal kalimat ini merupakan wujud kesadaran dan pesan penting para pendiri bangsa, bahwa membangun bangsa cerdas merupakan suatu keniscayaan untuk mewujudkan komitmen luhur kemerdekaan. Upaya membangun bangsa yang cerdas, berkaitan dengan pendidikan warga negara, dan oleh karena itu, seluruh komponen bangsa ikut berperan dan bertanggungjawab, terutama para pendidik, ilmuwan dan cendekiawan.Prof. Emil Salim, ilmuwan dan cendekiawan senior Indonesia, anggota Kehormatan Akademi Ilmu Pengetahuan Indonesia (AIPI), menggagas dan mengajak para anggota AIPI agar dapat menuliskan buah karya pemikirannya, berkontribusi dalam membangun bangsa yang cerdas. AIPI adalah wadah ilmuwan Indonesia terkemuka, didirikan dengan UU 8/1990 bertujuan untuk memberikankan pendapat, saran, pertimbangan mengenai penguasaan, pengembangan, dan pemanfaatan iptek untuk mencapai tujuan nasional.Dengan mengusung budaya ilmiah unggul, berkomitmen terhadap nilai-nilai keilmuwanan yang menjadi kebajikan, dan sikap hidup asketisisme, para ilmuwan AIPI selanjutnya menuangkan pendapat, saran, dan pandangan solusi terhadap persoalan dan tantangan bangsa. Buah karya pemikiran yang berbasiskan penguasaan bidang keilmuan yang mendalam ini, diharapkan dapat dijadikan mata air jernih gagasan untuk membangun bangsa cerdas.Buku Membangun Bangsa Cerdas: Kontribusi Pemikiran Ilmuwan AIPI merupakan bungai rampai serpihan mutiara pemikiran ilmuwan AIPI. Dihimpun berdasarkan bidang keilmuwan di AIPI yaitu: Ilmu Pengetahuan Dasar (9 judul), Ilmu Rekayasa (3 judul), Ilmu Kedokteran (5 judul), Ilmu Sosial (10 judul) dan Kebudayaan (10 judul).Judul-judul tulisan itu mengambarkan kedalaman penguasaan keilmuan para penulisnya. Materi tulisan menyajikan wawasan dan gagasan baru, berupa terobosan dan strategi kebijakan yang menekankan pada solusi; dengan ragam tujuan sosial ekonomi (TSE) untuk pertumbuhan ekonomi, kemasyarakatan, lingkungan, pertahanan, dan pemajuan ilmu pengetahuan. Buku ini dapat dibaca tidak secara berurutan per bab, tetapi dapat dibaca mulai dari bab yang lebih menarik terlebih dahulu
Layered 3D transition metal-based oxides for sodium-ion and lithium-ion batteries: differences, links and beyond
No full textDue to their stable crystal framework, promising energy density, and structural versatility, layered 3d transition metal oxides have emerged as the preferred cathodes for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). While extensive research has individually addressed the lithium and sodium 3d transition metal layered oxides, the differences and interconnections between the two types of materials have largely been overlooked. Effectively utilizing these summaries is essential for driving innovative structural designs and inspiring new insights into the structure-property relationships. This review comprehensively bridges this gap by meticulously examining the disparities and links in the behavior of the layered oxides upon Li+ and Na+ storage and transfer. Key aspects, including atomic and electronic structure, phase transition mechanisms, charge compensation mechanisms and electrochemical kinetics, are carefully summarized. The implications of these aspects on the battery cycle life, energy density, and rate capability are thoroughly discussed. Additionally, by leveraging the unique characteristics of each oxide structure, this review explores the interconnection between lithium and sodium layered oxides in depth. Finally, a concise perspective on future targets and direction of 3d layered oxides is deduced and proposed.Agency for Science, Technology and Research (A*STAR)National Research Foundation (NRF)Submitted/Accepted versionThe authors acknowledge the ASTAR MTC program M23L9b0052, ISPIRASI. This work was funded by the Indonesian Endowment Fund for Education (LPDP) on behalf of the Indonesian Ministry of Education, Culture, Research, and Technology, and managed under INSPIRASI Program (Contract No. 6635/E3/KL.02.02/2023). This research was supported bythe National Research Foundation, Singapore, under its Singapore-ChinaJoint Flagship Project (Clean Energy)
Recent Advances of Metal‐Organic Frameworks and Derivatives for Rechargeable Aluminum Batteries
No full textABSTRACT In light of cost‐effectiveness, high volumetric capacity, and abundant supplies on Earth of aluminum metal, the rechargeable aluminum battery (RAB) represents a cutting‐edge alternative for energy storage devices. RABs have achieved significant progress as a result of tireless efforts; however, challenges like as expensive ionic liquid electrolytes, a restricted voltage window of aqueous electrolytes, corroded anode, and rapid capacity degradation limit their practical applications. In terms of increasing RAB mileage, electrode materials can be regarded as the foundation of battery performance. Metal‐organic frameworks (MOFs), which have customizable topologies, multiple active sites, and various metal centers and ligands, are promising electrode materials. Herein, for the first time, we deliver in detail the recent advancement of MOFs in RABs. The relationship on structure‐properties‐performance of MOFs is thoroughly discussed. MOF and MOF‐derived electrode materials are first summarized. In aluminum sulfur/selenium batteries, MOF can serve as a host to capture the sulfides or selenides. Furthermore, the MOF as catalysts for aluminum‐air batteries are provided. Then we focused on the challenges and opportunities that RABs would face in the future, and some prospects are presented. We believe this account will facilitate the exploration of MOFs in RABs and give more inspiration for discovering advanced RABs
Metal-organic frameworks (MOFs) in aqueous batteries (ABs): unlocking potential through innovative materials design
No full textMetal-organic frameworks (MOFs) represent a revolutionary class of materials in the field of energy storage, particularly for aqueous batteries (ABs). Distinguished by their large surface area, tuneable porosity, and adaptable chemical activity, MOFs offer significant advantages over conventional materials in battery applications. This article provides a thorough analysis of the crucial role that MOFs play in improving the efficiency of ABs. It includes a concise review of the current research progress, emphasizing the fundamental processes by which MOFs enhance electrochemical efficiency. Additionally, the review examines the synthesis and design strategies for the structure of MOFs to maximize ion transport, improve conductivity, and enhance stability. The structural advantages, chemical versatility, stability, durability and functionalization potential of MOFs are comprehensively discussed. Moreover, we explore the distinct advantages of MOFs in overcoming common challenges encountered in ABs, such as declining capacity, inadequate cycling stability, and limited energy density. This paper also highlights the future research directions needed to fully harness their potential. Our goal is to develop a fundamental understanding and stimulate further progress in the use of MOFs for advanced energy storage solutions.Agency for Science, Technology and Research (A*STAR)Submitted/Accepted versionThis work was supported by the Agency for Science, Technology and Research (ASTAR) Manufacturing, Trade and Connectivity (MTC) Program (M23L9b0052) and the Indonesian Endowment Fund for Education (LPDP) on behalf of the Indonesian Ministry of Education, Culture, Research, and Technology, and managed under INSPIRASI Program (Contract No. 6635/E3/KL.02.02/2023)
Integrating machine learning and characterization in battery research: toward cognitive digital twins with physics and knowledge
No full textThe rapid advancement of battery technology has driven the need for innovative approaches to enhance battery management systems. In response, the concept of a cognitive digital twin has been developed to serve as a sophisticated virtual model that dynamically simulates, predicts, and optimizes battery behavior. These models integrate real-time data with in-depth physical insights, offering a comprehensive solution for battery management. Fundamental to this development are advanced characterization techniques such as microscopy, spectroscopy, tomography, and electrochemical methods—that provide critical insights into the underlying physics of batteries. Additionally, machine learning (ML) extends beyond predictive analytics to enhance the analytical capabilities. By uncovering deep physical insights, ML significantly improving the accuracy, reliability, and interpretability of these techniques. This review explores how integrating ML with traditional battery characterization techniques bridges the gap between deep physical insights and data-driven analysis. The synergy not only enhances precision and computational efficiency but also minimizes human intervention, thereby paving the way for more robust and transparent digital twin technologies in battery research.Agency for Science, Technology and Research (A*STAR)National Research Foundation (NRF)Submitted/Accepted versionThe work was fundedby the ASTAR MTC program M23L9b0052 and the Indonesian Endowment Fund for Education (LPDP) on behalf of the Indonesian Ministryof Education, Culture, Research, and Technology, which managed under INSPIRASI Program (Contract No. 6635/E3/KL.02.02/2023). This workwas also supported by the National Research Foundation, Singapore, under its Singapore-China Joint Flagship Project (Clean Energy)
SYNTHESIS OF Na-Y NANOZEOLITE ON GLASSY CARBON BY SEEDING METHOD
No full textNanozeolite synthesis was carried out through seeding method, in which the seed was Y zeolite (member of faujasite, FAU, family) using tetraethyl orto silicate (TEOS) as silica source, and aluminium isopropoxide Al[(CH3)2CHO)]3 as aluminum source, and tetramethylammoniumhydroxide (TMAOH) as template, under hydrothermal condition. The seeds then were grown on glassy carbon (GC) sheet, that prior being used was modified, using layer by layer (LbL) technique, with three layers of polyelectrolytes: Poly(diallyldimethylammoniumchloride), PDDA; Poly-4 sodiumstyrenesulfonate, PSS; and PDDA again. The seeded GC sheet then was immersed into colloidal suspension with molar composition as follow: 14Na2O: Al2O3: 10SiO2: 798H2O: 3Na2SO4 and the pH of the suspension was kept at 9,0 before was treated hydrothermally for 20 hours at 100 oC. The variation on number of seed layers on GC (1, 2 and 3 layers), observed by SEM, showed that homogenous structure and crystal size was obtained with 1 layer of seeds applied on the surface of glassy carbon. When more layers of seeds applied, the agregation and intergrowth of zeolite crystals in the thin film of zeolite became more visible. XRD pattern of the as-prepared thin film zeolite indicates that the zeolite has nanoparticle structure. Furthermore, the pattern of glassy carbon predominated the XRD pattern and covered the pattern of Y-zeolite. On the other hand, XRD of as prepared bulk Y-zeolite shows structure of FAU framework.Keywords: glassy carbon, FAU, nanozeolite, seeding metho
