06051nas a2200193 4500008004100000245010700041210006900148260000800217300001400225490000600239520537200245100002305617700001705640700002205657700001805679700001905697700001905716856012205735 2022 eng d00aSynthesis and ionic conductivity of calcium-doped ceria relevant to solid oxide fuel cell applications0 aSynthesis and ionic conductivity of calciumdoped ceria relevant  cOCT a8780-87910 v33 a

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–VIS diffuse reflectance, field emission scanning electron microscopy – 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 × 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 × 10−4, 4.42 × 10−3, and 5.76 × 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.

1 aMomin, Naeemakhtar1 aManjanna, J.1 aKobayashi, Satoru1 aAruna, S., T.1 aKumar, Senthil1 aNayaka, G., P. uhttp://library.ncl.res.in/content/synthesis-and-ionic-conductivity-calcium-doped-ceria-relevant-solid-oxide-fuel-cell01907nas a2200229 4500008004100000022001400041245010100055210006900156260000800225300001100233490000800244520113600252653002101388653002301409653001701432653002501449653001901474100001701493700001901510700002101529856012701550 2022 eng d a0925-838800aUltrahigh capacitance of NiCo2O4/CeO2 mixed metal oxide material for supercapacitor applications0 aUltrahigh capacitance of NiCo2O4CeO2 mixed metal oxide material  cAPR a1633120 v8993 a

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.

10aCharge-discharge10acyclic voltammetry10aNiCo2O4/CeO210aspecific capacitance10asupercapacitor1 aSanthosh, G.1 aNayaka, G., P.1 aBhatt, Aarti, S. uhttp://library.ncl.res.in/content/ultrahigh-capacitance-nico2o4ceo2-mixed-metal-oxide-material-supercapacitor-applications