@article {48431, title = {Synthesis and ionic conductivity of calcium-doped ceria relevant to solid oxide fuel cell applications}, journal = {Materials Advances}, volume = {3}, year = {2022}, month = {OCT}, pages = {8780-8791}, type = {Article}, abstract = {

Towards the development of green energy devices, it is necessary to focus on commercial electrolyte materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). Ca-doped ceria (CDC) samples having a composition of Ce(1-x)CaxO2-δ\ (0.03 <=\ x\ <= 0.1) were synthesized by a facile solid-state route and sintered at a lower temperature (1473 K). X-ray diffraction, Raman, X-ray photoelectron, Fourier-transform infrared, UV{\textendash}VIS diffuse reflectance, field emission scanning electron microscopy {\textendash} energy dispersive X-ray with elemental mapping, and electrochemical impedance spectroscopy techniques were used for the characterization of these CDC samples. The 0.10 CDC showed high oxide ion conductivity of 8.01 {\texttimes} 10-3\ S cm-1\ at 973 K with a lower activation energy of 0.78 eV. The 0.03 CDC, 0.05 CDC, and 0.07 CDC samples exhibited ionic conductivities of 1.66 {\texttimes} 10-4, 4.42 {\texttimes} 10-3, and 5.76 {\texttimes} 10-3\ S cm-1\ at 973 K with activation energies of 1.65, 1.01, and 0.92 eV, respectively. The present work aims to develop Ca-doped ceria as economically viable electrolytes for IT-SOFCs.

}, doi = {10.1039/D2MA00868H}, author = {Momin, Naeemakhtar and Manjanna, J. and Kobayashi, Satoru and Aruna, S. T. and Kumar, S. Senthil and Nayaka, G. P.} } @article {48413, title = {Ultrahigh capacitance of NiCo2O4/CeO2 mixed metal oxide material for supercapacitor applications}, journal = {Journal of Alloys and Compounds}, volume = {899}, year = {2022}, month = {APR}, pages = {163312}, type = {Article}, abstract = {

Pertaining to research on energy consumption and energy storage systems, new and efficient mixed metal oxides of NiCo2O4/CeO2 as pseudo-capacitor materials have been successfully prepared by sol-gel combustion method. The synthesized unique spinel nanomaterials have been analyzed for structural and morphological characterization by FT-IR, XRD, XPS and electron microscopy techniques. The mesoporous structure and large specific surface area of the synthesized nanomaterials provide an easy channel for ion mobility rendering an effortless redox process at the electrode electrolyte interface. As a consequence, it is observed that NiCo2O4 mixed with 10\% of CeO2 exhibits an excellent specific capacitance of 1355 Fg(-1) at 5 Ag-1 along with a high cycling stability with only 4.7\% capacity loss at the end of 6000 cycles at a charge-discharge current density of 10 Ag-1. The results obtained are in par with some of the recent electrode materials used for supercapacitors suggesting the possible employment of NiCo2O4/CeO2 mixed metal oxides in energy storage applications. (C) 2021 Elsevier B.V. All rights reserved.

}, keywords = {Charge-discharge, cyclic voltammetry, NiCo2O4/CeO2, specific capacitance, supercapacitor}, issn = {0925-8388}, doi = {10.1016/j.jallcom.2021.163312}, author = {Santhosh, G. and Nayaka, G. P. and Bhatt, Aarti S.} } @article {49379, title = {Efficient electrochemical synthesis of Cu 3 Si/Si hybrids as negative electrode material for lithium-ion battery}, journal = {Journal of Alloys and Compounds}, volume = {998}, year = {2024}, month = {SEP }, pages = {174996}, type = {Article}, abstract = {

Nanoscaling and alloying techniques for silicon -based materials are widely recognized as vital technological approaches to effectively address the challenges associated with volume expansion and poor conductivity in silicon anodes. Developing short process, cost-effective preparation methods and shape controllable silicon -based materials is expected to improve their cyclability. Herein, utilizing the superior electrical conductivity of copper metal and its stable alloy interaction with silicon, the present study introduced a simple synthetic process by incorporating nanoscale Cu 2 O into a SiO 2 dioxide matrix under a combination of hydrothermal reaction with Cu (NO 3 ) 2 as the copper source and further sintering treatment. Under the conditions of a Cu:Si molar ratio to 3:8 under 850 degrees C by 2.6 V of constant electrolsyis for 3 h, straight silicon nanowires with a cross-sectional distribution were obtained. The Cu 3 Si alloy particles were enriched around silicon nanowires. Experimental testing was conducted to evaluate the electrochemical storage capabilities of Cu 3 Si/Si nanowires, resulting in an initial specific capacity of 2630.7 mAh g -1 and an initial coulombic efficiency of 88.94\%. After 100 charge -discharge cycles, the discharge specific capacity reached 1675.4 mAh g -1 , with a capacity retention rate of 66.20\%. This work demonstrates the effectiveness of constructing a Cu 3 Si conductive network for solving the volume expansion and conductivity problems of Si and the distinctive Cu 3 Si/Si architecture offers an exemplary model for the design of silicon -based composite anodes for advanced lithium -ion batteries.

}, keywords = {Cu3Si/Si alloy, Electrochemical storage capacity, Molten salt electrochemistry, Si nanowires}, issn = {0925-8388}, doi = {10.1016/j.jallcom.2024.174996}, author = {Jiang, Siwei and Cheng, Jiaxu and Nayaka, G. P. and Dong, Peng and Zhang, Yingjie and Xing, Yubo and Zhang, Xiaolei and Du, Ning and Zhou, Zhongren} } @article {49263, title = {Reconstituting the microstructural properties and ionic conductivity of copper - doped yttria-stabilized zirconia via mechanochemical synthesis for intermediate-temperature solid oxide fuel cell applications}, journal = {CERAMICS INTERNATIONAL}, volume = {50}, year = {2024}, month = {OCT }, pages = {35178-35192}, type = {Journal Article}, keywords = {ELECTRICAL-PROPERTIES, OPTICAL-PROPERTIES, THERMAL-STABILITY, TRANSITION-METAL}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2024.06.326}, author = {Momin, Naeemakhtar and Manjanna, J. and Kobayashi, Satoru and Aruna, S. T. and Kumar, S. Senthil and Ahmad, Tokeer and Nayaka, G. P. and Mubeen, B. and Sabale, Sandip and Kangralkari, Mrunal V. and Keri, Rangappa S.} }