Article
Chemistry, Inorganic & Nuclear
Nicolas Zapp, Denis Sheptyakov, Alexandra Franz, Holger Kohlmann
Summary: Substituting hydrogen for oxygen atoms in metal oxides influences the solid-state properties, and holmium hydride oxide exhibits high thermal stability and inertness towards air, with an ordered fluorite superstructure.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Shinho Cho
Summary: Eu3+- or Dy3+-doped YNbO4 phosphors were prepared via solid-state reaction technique with different concentrations of activator ions. The optimal doping concentrations for high-color-purity yellow- and red-emitting phosphors were found to be 5 mol% Dy3+ and 15 mol% Eu3+, respectively.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Inorganic & Nuclear
Ahmed. Dhahri, Arwa Belkahla, J. Laifi, Soumaya Gouadria, M. Elhadi, J. Dhahri, E. Dhahri
Summary: The Ba0.95Ca0.05Ti0.97Y0.04O3 solid solution was synthesized by solid state method and characterized using XRD and SEM, demonstrating its physical properties and semiconductor behavior with increasing temperature.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Jaegyeom Kim, Junho Ha, Fouzia Khefif, Jong-Young Kim, Seung-Joo Kim
Summary: A new sodium tantalum phosphate, NaTa2PO8, was synthesized via ion exchange reaction in molten NaNO3 medium. The compound exhibited different crystal structures, ionic conductivities, and conduction pathway characteristics between the low-temperature and high-temperature phases.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Yuta Ito, Isao Tsuyumoto
Summary: Nanocrystalline lithium niobate, LiNbO3, is prepared through an aqueous solution process, starting from peroxo - polyniobic acid solution. The crystalline LiNbO3 has the same structure as conventional LiNbO3 with a small crystallite size. The nanocrystalline LiNbO3 prepared at 500 degrees Celsius exhibits a high ionic conductivity.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Fouad Alloun, Mohammed Hadouchi, Abderrazzak Assani, Mohamed Saadi, Abdelilah Lahmar, Mimoun El Marssi, Daoud Mezzane, Lahcen El Ammari
Summary: A new silver-cobalt-iron orthophosphate was synthesized and studied in single crystal and powder forms. The crystal structure was determined as monoclinic with C2/c space group. The phosphate consists of FeO6 and CoO6 octahedra, and PO4 tetrahedra forming infinite layers. Ag+ cations occupy the interlayer space and crystal framework cavities. The synthesized powder's purity was confirmed using X-ray diffraction analysis. The infrared and Raman spectra indicated the vibration modes of the PO4 tetrahedra. Impedance spectroscopy showed an ionic conductivity of 2.6 x 10(-3) S cm(-1) at 773 K, with Ag+ mobility in the layered structure. Magnetic investigation revealed antiferromagnetic order below T-N of 10 K and a Curie-Weiss constant of theta = -119.39 K.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Physical
Khalid Mujasam Batoo, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Muhammad Hadi, Omar M. Aldossary, Y. Al-Douri
Summary: This study reported the synthesis of Gd and Nb co-doped BT ceramic oxides and investigated their structural and electrical properties. Various analysis techniques were used to characterize the samples, revealing the influence of Gd and Nb doping on the electrical properties of the ceramic materials, which were found to improve with increasing dopant concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Chetan B. Palan, Nikhilesh S. Bajaj, Suresh P. Bhagat, Shrinivas K. Omanwar
Summary: In this study, hexagonal structured borate phosphors BaLaB9O16 were synthesized using a combustion method, with color-tunable emission properties achieved by doping Eu3+ and Tb3+. The materials were analyzed for structural and morphological parameters, with photoluminescence results showing good green and red emissions for Tb3+ and Eu3+ doping, respectively, and the co-doped sample exhibiting variable emission from green to red regions by adjusting the excitation wavelength.
Article
Chemistry, Inorganic & Nuclear
Najah Rhimi, N. Dhahri, M. Khelifi, E. K. Hlil, J. Dhahri
Summary: This work focuses on studying the properties of sodium bismuth titanate (NBT) ceramic, including its structure, optical properties, and electrical properties. The material exhibited a poly-crystalline structure with a rhombohedral shape, and a grain size of 29.17 μm. The dielectric loss and dielectric constant increased with frequency, and the conduction mechanism followed the correlated barrier hopping (CBH) and small polaron hopping (SPH) models. The study provides valuable insights into the physical characteristics of NBT and its potential applications in the industry.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Rajamani Nagarajan, Vipul Shrivastava, Jyoti Pandey
Summary: This study stabilized metastable gamma-Bi2O3 without impurities and investigated the effects of indium ion doping on its structure and optical properties. Doping with indium resulted in changes in color and optical bandgap, with non-stoichiometric samples exhibiting lower bandgap values. Additionally, indium-doped non-stoichiometric Sillenites displayed higher BET surface area and slightly increased oxygen ion conductivity compared to stoichiometric counterparts.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
I. P. Studenyak, A. Pogodin, V. Studenyak, O. P. Kokhan, Yu M. Azhniuk, D. Solonenko, L. Daroczi, S. Kokenyesi, D. R. T. Zahn
Summary: Sodium halogenthiophosphates Na6PS5Br and Na6PS5Cl, as well as halogen-free Na7PS6, were synthesized using a two-step technique. The crystal structure was confirmed through X-ray diffraction and Raman spectroscopy, showing similarities to chemically related compounds. The electrical conductivity of the synthesized compounds was found to be predominantly ionic.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Rose J. Miller, Vanessa M. Smith, Stacy A. Love, Sarah M. Byron, David Salas-de la Cruz, Kevin M. Miller
Summary: By functionalizing cellulose with 1,2,3-triazolium groups, derivatives were obtained with observed T-g values inversely related to the size of the counteranions, indicating dependence on anion basicity and hydration for thermal and ionic conductivity properties.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
A. Kadari, R. Chikhaoui, I. A. El-Mesady
Summary: In this study, magnesium borate was synthesized via sol-gel process with Mn2+ and Dy3+ dopants. X-ray diffraction and Fourier Transform Infrared were used to study the properties and absorption spectra. Particle sizes and energy band gap were calculated, showing that doping can increase the energy band gap. These results are important for increasing the utilization of magnesium borate in various industrial applications.
Article
Chemistry, Physical
Prachi Chaudhary, Rishabh Shukla, Samiksha Dabas, O. P. Thakur
Summary: This study investigates the effects of Nb substitution on the properties of a multiferroic solid solution, revealing significantly enhanced magnetic and dielectric properties in Nb-substituted samples, making them suitable for memory device applications. Additionally, changes in the structure and the coupling between electric and magnetic dipoles were confirmed through various analytical techniques.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Applied
Rabia Kirkgecit, Handan Ozlu Torun, Fatma Kilic Dokan, Esra Ozturk
Summary: In this research, undoped CeO2 and Ce0.85La0.10M0.05O2 (M: Sm, Er, Y) compounds were synthesized by the hydrothermal method and their multi-functional properties were investigated. The addition of rare earth ions created oxygen defects in the compounds, affecting their electrical and luminescence behaviors. Characterization techniques such as XRD, BET, UV-vis DRS, SEM, PL spectroscopy, and EIS were employed to analyze the synthesized products. The compounds were found to be nanostructured and have a cubic phase. The total conductivity and bandgap energy of the compounds were calculated, and the emission spectra showed different colors depending on the additive type.
JOURNAL OF RARE EARTHS
(2022)
Article
Energy & Fuels
Zafar Arshad, Sehar Shakir, Asif Hussain Khoja, Ahad Hussain Javed, Mustafa Anwar, Abdur Rehman, Rahat Javaid, Umair Yaqub Qazi, Sarah Farrukh
Summary: The modified sol-gel method was used to synthesize Ca-doped TiO2 films as the electron transport material for perovskite solar cells. The study found that 2% Ca doping showed the highest conversion efficiency and nearly doubled the efficiency compared to pristine TiO2, along with an increase in current density.
Article
Green & Sustainable Science & Technology
Saira Kanwal, Muhammad Taqi Mehran, Muhammad Hassan, Mustafa Anwar, Salman Raza Naqvi, Asif Hussain Khoja
Summary: Energy security is crucial for socioeconomic development in countries like Pakistan. This study provides a framework for developing domestic alternative energy resources to address the natural gas crisis and achieve sustainable energy security.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Review
Chemistry, Physical
Mustafa Anwar, Muhammed Ali Shaikh Abdul, Uneeb Masood Khan, Muhammad Hassan, Asif Hussain Khoja, Andanastuti Muchtar
Summary: This article reviews the adoption of X-ray photoelectron spectroscopy (XPS) for the characterization of SOFC cathode materials, discussing their degradation mechanism and strategies for improving cathode performance.
Article
Energy & Fuels
Ahmad Fuzamy Mohd Abd Fatah, Ahmad Zaki Rosli, Ahmad Azmin Mohamad, Andanastuti Muchtar, Muhammed S. A. Ali, Noorashrina A. Hamid
Summary: This study investigates the effect of adding nickel oxide (NiO) to lanthanum strontium cobalt ferrite (LSCF) cathode on its physical and electrochemical properties. The results show that adding 5% nickel oxide to LSCF results in the lowest impedance value and enhances the oxygen reduction process. LSCF-NiO with outstanding performance was successfully synthesized at intermediate temperatures (800-600 degrees C).
Article
Energy & Fuels
Joelle C. W. Mah, Isyraf Aznam, Andanastuti Muchtar, Mahendra Rao Somalu, Jarot Raharjo
Summary: This study investigated the influence of citric acid on the structure, morphology, and electrical properties of sol-gel derived (Cu,Mn,Co)(3)O-4 (CMC) spinel powders. Dual-phase CMC spinel powders consisting of cubic CuMnCoO and tetragonal Mn2CoO4 were successfully synthesized at citrate-to-nitrate (CA/MN) ratios of 0.8, 1.0, and 1.2. The CA/MN ratio not only affected the phase formation of CMC spinel, but also influenced the particle size distributions. The CA/MN ratio of 1.0 resulted in the finest CMC spinel with the least agglomerates and the highest electrical conductivity of 116 Scm(-1). Therefore, a CA/MN ratio of 1.0 was recommended for the synthesis of CMC spinel for the fabrication of protective coatings in solid oxide fuel cell interconnects.
Article
Energy & Fuels
Sana Gohar Khan, Muhammad Hassan, Mustafa Anwar, Zeshan, Uneeb Masood Khan, Chao Zhao
Summary: This research presents the synthesis and application of Pr-CaO catalysts for biodiesel production from castor oil, which showed stable, active, and low-cost characteristics. The obtained catalyst exhibited a high FAME yield of 87.42% under optimal reaction conditions using 7% Pr-CaO mixed oxide catalyst.
Article
Polymer Science
Adam Mohd Izhan Noor Azam, Ng Khai Li, Nurul Noramelya Zulkefli, Mohd Shahbudin Masdar, Edy Herianto Majlan, Nurul Akidah Baharuddin, Azran Mohd Zainoodin, Rozan Mohamad Yunus, Noor Shahirah Shamsul, Teuku Husaini, Siti Nur Amira Shaffee
Summary: The effects of operating parameters and electrode types on hydrogen gas production through electrolysis were investigated in a PEM electrolyzer. Various parameters including power supply, feed water flow rate, water temperature, and anode electrocatalyst type were varied. The best performance was observed with a flow rate of 2 mL/min and a temperature of 70 degrees C, using a membrane electrode assembly with a 3.0 mg/cm2 IrRuOx catalyst at the anode side. Optimal energy consumption was achieved at a current density of around 200 mA/cm2, with voltaic and energy efficiencies of 85% and 67.5% respectively. These findings highlight the importance of optimizing operating parameters to enhance the performance and reduce the costs of PEM electrolyzers.
Article
Materials Science, Ceramics
Muhammad Talha Shabbir, Tayyab Hussain, Sehar Shakir, Mustafa Anwar, Asif Hussain Khoja, Syed Nawaz, Aamir Naseem Satti
Summary: In this study, a composite of erbium oxide (Er2O3) and zinc oxide (ZnO) was synthesized using the sol-gel combustion method and molybdenum (Mo) was loaded on the matrix to suppress charge recombination. The characterization results showed that the addition of ZnO and Mo increased the surface area and enhanced carrier immobilization, leading to improved photocatalytic properties. The composite material exhibited an 80% enhancement in the degradation efficiency of methylene blue (MB) dye. The improved photocatalytic and electrical properties make this material a promising candidate for optoelectronic applications.
CERAMICS INTERNATIONAL
(2023)
Review
Chemistry, Physical
Ainaa Nadhirah Zainon, Mahendra Rao Somalu, Audi Majdan Kamarul Bahrain, Andanastuti Muchtar, Nurul Akidah Baharuddin, S. A. Muhammed Ali, Nafisah Osman, Abdullah Abdul Samat, Abul Kalam Azad, Nigel P. Brandon
Summary: Solid oxide fuel cells (SOFCs) generate high-efficiency electrical power through the electrochemical reaction of fuel with air. However, the conventional Ni-based anodes face challenges and limitations when using various types of fuels. Therefore, it is crucial to discover alternative anodes or modify existing ones to overcome these challenges and limitations.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
Sumarni Mansur, Nurul Akidah Baharuddin, Wan Nor Anasuhah Wan Yusoff, Azreen Junaida Abd Aziz, Mahendra Rao Somalu
Summary: A new strategy is proposed to reduce the operating temperature of the solid oxide fuel cell (SOFC) by using a lithium (Li)-based cathode. The LiCo0.6Sr0.4O2 (LCSO) precursor calcined at 800°C has shown better electrochemical performance compared to LCSO calcined at 900°C. This study provides important insights for the development of intermediate temperature-SOFC.
Article
Engineering, Chemical
Nur Hanisah Hadi, Mahendra Rao Somalu, Abdullah Abdul Samat, Wan Nor Anasuhah Wan Yusoff, Andanastuti Muchtar, Nurul Akidah Baharuddin, Muhammed Ali Shaikh Abdul, Jarot Raharjo, Deni Shidqi Khaerudini, Abdalla M. Abdalla, Abul Kalam Azad
Summary: Investigating the influence of sintering temperature on the physical and chemical properties of Ni-BaCe0.54Zr0.36Y0.1O3-(Ni-BCZY) composite anode is important for its potential application in protonic ceramic fuel cells (PCFCs). The study found that the NiO-BCZY composite powder, prepared using citric acid as the chelating agent, showed optimal properties when sintered at 1100°C, with a single cubic phase structure and homogeneous particles with an average size of 51 nm.
Article
Thermodynamics
Muhammad Uzair Azhar, Mustafa Anwar, Uneeb Masood Khan, Muhammad Hassan, S. A. Muhammed Ali, Adeel Waqas, Mahendra Rao Somalu, Faisal Alresheedi
Summary: A multigeneration system that integrates solid oxide fuel cells with other systems is proposed to address high temperature exhaust emissions and increasing demand for power and utilities. The thermodynamic assessment shows that the system can generate electricity, heating, cooling, and fresh water efficiently. The parallel configuration provides flexibility in operation and a wider range of output power and utilities.
ENERGY CONVERSION AND MANAGEMENT
(2023)