Article
Engineering, Environmental
Yangfei Gao, Xiaopei Zhu, Bian Yang, Peng Shi, Ruirui Kang, Ye Yuan, Qida Liu, Ming Wu, Jinghui Gao, Xiaojie Lou
Summary: A new type of lead-free ceramics with excellent energy storage performance was successfully prepared by controlling the grain size and doping of impurities, providing new possibilities for practical applications of ferroelectric ceramics in energy storage.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
A. Ihyadn, S. Merselmiz, D. Mezzane, L. Bih, A. Lahmar, A. Alimoussa, M. Amjoud, Igor A. Luk'yanchuk, M. El Marssi
Summary: Lead-free BCZT ceramics with different BNNWP glass contents were synthesized. The XRD analysis revealed the presence of tetragonal and orthorhombic phases in pure BCZT, while only the tetragonal phase was found in BCZTx ceramics. The SEM observations showed that the average grain size decreased with increasing BNNWP glass additives. BCZT4 exhibited the highest recovered energy density of 0.52 J/cm(3) at 135 kV/cm, with an energy storage efficiency increased by 6.6 compared to BCZT0. The energy density was also calculated using the LGD theory.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Xiao-Fen Li, Tian-Yu Wang, Si-Jia Yin, Gui-Xin Zhang, Jian-Bo Liu, Bai-Xin Liu
Summary: This study presents an efficient and stable approach for physically passivating deep-level defect states in polymer dielectrics to enhance their dielectric properties. By using inductively coupled plasma technology with argon as the carrier gas, deep-level defect states in the polymer are significantly reduced, leading to a remarkable increase in flashover voltage and improved breakdown strength. The treated material also exhibits long-term stability and can boost discharge energy density without compromising efficiency.
Article
Materials Science, Ceramics
Jing Li, Ye Tian, Yu Lan, Li Jin, Chao Chen, Xiaoyong Wei
Summary: By adjusting the silver deficiency, it is possible to enhance the energy storage performance of AgNbO3 ceramics, reducing the maximum polarization strength and enhancing the transformation fields, resulting in superior performance at lower x values.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xuqing Zhang, Yongping Pu, Yating Ning, Lei Zhang, Yangchao Shang, Bo Wang, Zhemin Chen
Summary: (1-x)Ca0.5Sr0.5TiO3-xSmNbO4 ceramics were synthesized via solid-phase reaction method at 1400 degrees C. The addition of SmNbO4 significantly improved the breakdown strength (510 kV/cm) and energy storage performance (5.43 J/cm3 and 95.1%), making it the best choice among linear dielectrics. The effects of SmNbO4 on charge transport and interfacial polarization behavior were investigated. Furthermore, the ceramics capacitor exhibited excellent power density of 36.7 MW/cm3 in an ultrafast discharge time of 29 ns at 140 kV/cm. Meanwhile, x=0.005 ceramics showed good temperature (20 degrees C-170 degrees C) and frequency stability (1 Hz-100 Hz).
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Yuanhui Su, Yu Huan, Bo Peng, Xinjian Wang, Longwen Wu, Tao Wei
Summary: An effective strategy to enhance the energy storage density and efficiency of dielectric polymers is proposed by constructing a heterostructure of Ba0.4Sr0.6TiO3/MnO2 in BST/MnO2/P(VDF-HFP)& PMMA composites. The tight attachment of MnO2 on BST particles improves the local electric field intensity, enhancing polarization. Additionally, the semiconductive MnO2 can trap injected and excited electrons and inhibit the mobility of free charge carriers, leading to improved energy storage performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Heng Wu, Wenchuan Li, Hong Ao, Zhixin Zeng, Xiaofeng Qin, Shulin Xing, Chuang Zhou, Rongli Gao, Xiaoling Deng, Wei Cai, Gang Chen, Zhenhua Wang, Xiang Lei, Chunlin Fu
Summary: The study synthesized PLZT@SiO2 core-shell structure ceramic materials and found that the holding time has an impact on their electrical properties and energy storage properties. Coating with SiO2 was shown to increase the energy density.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
L. N. Shi, R. H. Jin, Y. Q. Guo, Aditya Jain, Z. H. Ren, H. Z. Zhou, F. G. Chen, Y. G. Wang
Summary: This study systematically investigates the structure, dielectric properties, and energy storage properties of Bi(Mg2/3Nb1/3)O3 (BMN) modified Na0.5Bi0.5TiO3-NaNbO3 (NBTNN) ceramics. The introduction of BMN promotes the formation of local random field, effectively suppressing the hysteresis loss and forming slender P-E hysteresis loops. The optimum composition of 0.8NBTNN-0.2BMN achieves a maximum recoverable energy density of 5.26 J/cm3, three times higher than the undoped one, with a high energy efficiency of 78%. Additionally, the introduction of BMN improves temperature stability and increases the band gap of the NBTNN ceramic.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Amjad Ullah, Zhonghua Yao, Hanxing Liu, Hua Hao, Abdul Manan, Atta Ullah, Abdullah Jan, Minghe Cao, Safeer Ahmad, Faisal Alresheedi
Summary: The study synthesized high-capacity lead-free ferroelectric ceramics with excellent energy storage properties through LN doping. The dense microstructure achieved through LN doping contributes to the high energy-storage density and recoverable energy density, making it a promising candidate for power pulsed applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Ceramics
Chenhe Zhou, Xiaoyan Zhang, Shuning Li, Jinhua Yan, Xiwei Qi
Summary: A series of high-entropy perovskite ceramics with excellent dielectric properties and energy storage efficiency were successfully synthesized, suggesting entropy engineering as a viable strategy for tailoring material properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Neha, Richa Pandey, Manoj Bhatnagar, Parveen Kumar, Rajesh Kumar Malik, Chandra Prakash
Summary: Ceramic samples with a perovskite structure were prepared using the conventional solid state reaction method. The samples exhibited high dielectric constant and energy storage efficiency at room temperature.
Article
Materials Science, Ceramics
Zhuo Li, Jiayong Zhang, Chenbo Wang, Zixuan Wang, Nannan Lei, Lifei Zheng, Dingjie Long, Xiaotian Wei, Jing Zhang, Zhuo Wang, Xin Yan, Tao Ai, Dawei Wang, Yanhui Niu
Summary: By studying NBT-based ceramics with different compositions, this research found that the addition of Bi(Mg2/3Nb1/3)O3 can change the phase structure of the material and improve its relaxation behavior and grain growth. By controlling the particle size and dielectric breakdown strength, the researchers successfully achieved high energy storage density and energy storage efficiency, with excellent stability at different temperatures. These findings suggest that NBBT-20BMN ceramics have potential applications in the field of energy storage.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Fang Wang, Cong Zhu, Shifeng Zhao
Summary: Lead-free perovskite-structured Na0.5Bi0.5TiO3 (NBT) thin films prepared by sol-gel technology exhibit good energy storage performance, with a recoverable energy density of 23.3 J/cm(3) and energy storage efficiency of 61.6%, making them promising for capacitors with high energy storage properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Zehua Jiang, Zhengyi Yang, Ying Yuan, Bin Tang, Shuren Zhang
Summary: Perovskite ceramic materials with a BNBST-xNN composition were fabricated using a solid-state reaction method. The addition of NaNbO3 suppressed grain growth and enhanced relaxor characteristics and dielectric temperature stability. The BNBST-0.1NN solid solution exhibited high recoverable energy storage density, excellent fatigue characteristics, and superior thermal stability of permittivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Tapas Pal Majumder
Summary: This study theoretically investigates the dielectric spectrum of polymer-dispersed antiferroelectric liquid crystals (PDAFLC) by considering the influence of flexoelectric polarization. The results reveal that flexoelectric polarization has a significant impact on both low-frequency and high-frequency modes, as well as on the dielectric permittivity and strength of PDAFLC.
Article
Materials Science, Multidisciplinary
S. O. Oparanti, A. A. Khaleed, A. A. Abdelmalik
Summary: In the quest for a clean alternative insulating oil, the potential of transformer oil-based nanofluids using natural ester as a green alternative has been thoroughly investigated. This study focused on improving the physicochemical properties, dielectric loss, and breakdown voltage of palm kernel oil ester by incorporating Al2O3 and TiO2 nanoparticles. The dispersion of nanoparticles in the fluid was found to increase the breakdown voltage and decrease the dielectric loss of the nanofluid sample, showing improved performance compared to the base alkyl ester.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Automation & Control Systems
Samson Okikiola Oparanti, Abubakar Abubakar Khaleed, Abdelghaffar Amoka Abdelmalik
Summary: This study investigates the effect of Al2O3 and TiO2 nanoparticles dispersed in methyl ester to form nanofluids for oil-filled power equipment. The results show that Al2O3 nanofluid possesses superior dielectric properties and characteristic breakdown strength, making it a suitable replacement for mineral insulating oil.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
S. O. Oparanti, A. A. Abdelmalik, A. A. Khaleed, J. K. Abifarin, M. U. Suleiman, V. E. Oteikwu
Summary: This study explored the cooling and insulation properties of a synthetic nanofluid as an alternative to mineral oil, using Neem oil ester as the base fluid in combination with SiO2 and WO3 nanoparticles. The nanofluid with dispersed SiO2 nanoparticles showed superior cooling properties compared to WO3 nanoparticles, with low viscosity, low pour point, and good flash point, even after ageing, surpassing the performance of mineral oil.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
I. U. Nkole, S. O. Idris, I. Abdulkadir, A. D. Onu
Summary: The redox reaction between bis-(2-pyridinealdoximato)dioxomolybdate(IV) complex, [MoIVO2(paoH)2]2-, and thiosulphate ion (S2O32-) exhibits different rates in different media. The reaction is slower in acidic medium compared to surfactant (CTAB) medium. It is a first-order reaction with respect to both reactant concentrations, and second-order overall. The products formed are molybdenum(II) ion and tetrathionate ion.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Environmental Sciences
Samson Okikiola Oparanti, Ismail Kola Salaudeen, Andrew Adewunmi Adekunle, Victoria Ene Oteikwu, Abdulsalam Ismaila Galadima, Abdelghaffar Amoka Abdelmalik
Summary: This research investigates the possibility of using ester derived from Thevetia Peruviana oil as an alternative insulating oil. Through various tests, the functionality and characteristics of the ester were confirmed, and it was found to have a higher dielectric constant and a lower pour point. The results suggest that methyl ester from the non-edible vegetable oil is a promising alternative insulating oil.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Energy & Fuels
Samson Okikiola Oparanti, Andrew Adewunmi Adekunle, Victoria Ene Oteikwu, Abdulsalam Ismaila Galadima, Abdelghaffar Amoka Abdelmalik
Summary: The physicochemical and dielectric properties of methyl ester from neem, yellow oleander and palm kernel oil were measured. The mixture of palm kernel oil methyl ester and yellow oleander oil methyl ester showed desired properties and has the potential to replace mineral oil as an alternative insulating oil.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Review
Engineering, Electrical & Electronic
A. A. Adekunle, S. O. Oparanti
Summary: Faults in high voltage equipment have significant economic impact on power utilities and users. Mineral oil has been widely used as insulation in oil filled power equipment, but there is a growing demand for an alternative due to increased energy demand and environmental factors. The use of vegetable oil as an alternative insulation oil faces challenges. However, the addition of natural methyl ester nanoparticles has mitigated these obstacles by forming nanofluids.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Multidisciplinary Sciences
I. U. Nkole, S. O. Idris, A. D. Onu, I Abdulkadir
Summary: Piszkiewicz's and Berezin's models were applied to study the redox reaction between allylthiourea and bis-(2-pyridinealdoximato)dioxomolybdate(IV) complex in an aqueous acidic medium. The results showed a high cooperativity pattern and strong interaction between the redox partners in the presence of CTAB. The reaction rate was influenced by the cationic counter-ion and inhibited by SDS. The ionic strength and medium polarity also had an effect on the reaction rate. The models accurately depict the interaction between the substrates and surfactant molecules.
BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Samuel Ndaghiya Adawara, Gideon Adamu Shallangwa, Paul Andrew Mamza, Ibrahim Abdulkadir
Summary: This study aimed to design more potent derivatives of dengue virus NS-5 protease inhibitors using computational methods. Eight more potent derivatives were discovered by substituting the previous lead compound. These compounds outperformed previous inhibitors in docking scores and showed good drug-likeness, bioavailability, and non-toxicity.
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
I. U. Nkole, S. O. Idris, I Abdulkadir, A. D. Onu
Summary: The redox reaction between gallic acid and bis-(2-pyridinealdoximato)dioxomolybdate(IV) in an aqueous acidic medium was studied spectrophotometrically. The reaction proceeded with a 2:1 stoichiometry and the participation of a reactive free radical species. The reaction rate was found to be first order with respect to the concentration of both reactants. The concentration of salt in the reaction mixture affected the reaction rate, with a positive salt effect observed. Counter-ions NH4+ and SO42- were found to have a catalytic and inhibitory effect on the reaction rate, respectively. The thermodynamic features of the reaction indicated the formation of energized and activated complexes in the transition state. The involvement of a firm intermediate complex was ruled out, suggesting an outer-sphere mechanistic route.
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Samuel Ndaghiya Adawara, Gideon Adamu Shallangwa, Paul Andrew Mamza, Abdulkadir Ibrahim
Summary: This study investigated potential inhibitors of dengue virus RNA-Dependent RNA polymerase through modeling, docking analysis, and ADME prediction. The results showed that the compounds possess significant inhibitory activity and adhere to Lipinski's rule of 5 for drug bioavailability.
SCIENTIFIC AFRICAN
(2021)