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    Effect of ‘Mo’ doping into BiMnO3 on structural, dielectric, and leakage current properties
    (Elsevier Ltd, 2023) Kalra, Chahek; Sharma, Subhash; Kumar Chourasia, Ritesh; Kumar, Arvind; Siyahjani Gultekin, Sirin; Kumar, Manish
    The simultaneous existence of more than one ferroicorder (ferroelectric, magnetic and ferroelastic) i.e., multiferroism in materials is the center of attention of the current materials researchers. Multiferroism is rare in the materials due to the different chemistry of the ferroic orders and highly useful in various device applications such as in spintronics. In this connection, BiMnO3 is one of the multiferroic materials among the number of available multiferroic materials. It shows ferroelectricity as well as antiferromagnetic nature simultaneously. In the present work, efforts have been made to synthesize the BiMnO3 in pure phase as well as with the doping of ‘Mo’ in the ratio of 2 %, 4 %, and 8 % via solid-state reaction route and denoted by BMM0, BMM2, BMM4, and BMM8, respectively. The structural analysis confirms the monoclinic structure along with some impurities and also confirms the polycrystalline nature of all the samples. Impurities reduce with the ‘Mo’ doping into BiMnO3. The dielectric and leakage current density measurements confirm the high dielectric constant, low dielectric loss, and low leakage current density values in the samples as increment in the ‘Mo’ content into the pure BiMnO3 phase. The BMM8 has the dielectric constant (?2265 at 1 kHz and ? 385 at 10 kHz), dielectric loss (?2.32 at 1 kHz and ? 2.66 at 10 kHz), and leakage current density (?3.73 × 10-4 A/cm2 at 2 V and ? 1.00 × 10-3 A/cm2 at 3 V). © 2023
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    Stable Efficient Solid-State Supercapacitors and Dye-Sensitized Solar Cells Using Ionic Liquid-Doped Solid Biopolymer Electrolyte
    (Amer Chemical Soc, 2024) Konwar, Subhrajit; Siyahjani Gultekin, Sirin; Gultekin, Burak; Kumar, Sushant; Punetha, Vinay Deep; Yahya, Muhd Zu Azhan Bin; Diantoro, Markus
    As synthetic and nonbiodegradable compounds are becoming a great challenge for the environment, developing polymer electrolytes using naturally occurring biodegradable polymers has drawn considerable research interest to replace traditional aqueous electrolytes and synthetic polymer-based polymer electrolytes. This study shows the development of a highly conducting ionic liquid (1-hexyl-3-methylimidazolium iodide)-doped corn starch-based polymer electrolyte. A simple solution cast method is used to prepare biopolymer-based polymer electrolytes and characterized using different electrical, structural, and photoelectrochemical studies. Prepared polymer electrolytes are optimized based on ionic conductivity, which shows an ionic conductivity as high as 1.90 x 10(-3) S/cm. Fourier transform infrared spectroscopy (FTIR) confirms the complexation and composite nature, while X-ray diffraction (XRD) and polarized optical microscopy (POM) affirm the reduction of crystallinity in biopolymer electrolytes after doping with ionic liquid (IL). Thermal and photoelectrochemical studies further affirm that synthesized material is well stable above 200 degrees C and shows a wide electrochemical window of 3.91 V. The ionic transference number measurement (t ion) confirms the predominance of ionic charge carriers in the present system. An electric double-layer capacitor (EDLC) and a dye-sensitized solar cell (DSSC) were fabricated by using the highest conducting corn starch polymer electrolyte. The fabricated EDLC and DSSC delivered an average specific capacitance of 130 F/g and an efficiency of 1.73% in one sun condition, respectively.