06052nas a2200193 4500008004100000245010700041210006900148260000800217300001400225490000600239520537200245100002305617700001705640700002205657700001805679700001905697700001905716856012305735 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. uhttps://library.ncl.res.in/content/synthesis-and-ionic-conductivity-calcium-doped-ceria-relevant-solid-oxide-fuel-cell02683nas a2200193 4500008004100000022001400041245018000055210006900235260000900304300001600313490000700329520192700336100002402263700002002287700001502307700001702322700001802339856013202357 2024 eng d a0887-062400aEnvironment friendly synthesis of reduced graphene oxide from spent lithium-ion battery graphite and its nanocomposite with MoO3 nanorods for photocatalytic hydrogen evolution0 aEnvironment friendly synthesis of reduced graphene oxide from sp cNOV  a22376-223920 v383 a

Photocatalytic water splitting from solar H2 generation systems is of great interest as a sustainable fuel and an environmentally benign approach. A photocatalyst should be cost-efficient and highly productive to obtain a green H2 fuel. Thus, photocatalytic water splitting is significant for real-world applications. In the present work, we have successfully synthesized MoO3@rGO nanocomposite material with heterojunction as a stable and high-performance photocatalyst for the H2 evolution reaction in deionized (DI) water and natural seawater. First, MoO3 was prepared through a low-temperature hydrothermal method and composites with graphene oxide (GO) and reduced graphene oxide (rGO) precursors, followed by ultrasonication. rGO was obtained from GO, which is obtained from the spent graphite (anode material) by the modified Hummer's method. The rGO powder was reduced by an ascorbic acid-reducing agent under microwave irradiation using GO. The nanocomposite materials were characterized using XRD, Raman spectra, XPS, photoluminescence, FE-SEM, HR-TEM, and BET. The photocatalytic water splitting ability of MoO3@rGO was measured under visible light (lambda >= 420 nm) irradiation with the TEOA sacrificial reagent. The H2 generation rate in DI water and natural seawater was found to be 2183.41 and 2294.26 mu mol g-1 h-1, with an apparent quantum efficiency (AQE) of 5.72 and 5.98%, respectively. Such a high rate of H2 generated is ascribed to the novel surface contact between MoO3 and the rGO sheet as evident from HR-TEM images, wherein the rGO sheet is seen wrapped around MoO3. Consequently, the synergistic effect between MoO3 and rGO sheets is expected without the use of any other cocatalysts. Thus, electron-hole recombination is significantly minimized during the water reduction reaction. We believe that the MoO3@rGO nanocomposite is a potential photocatalyst for energy production.

1 aKangutkar, Raju, S.1 aWalko, Priyanka1 aAthira, K.1 aManjanna, J.1 aDevi, Nandini uhttps://library.ncl.res.in/content/environment-friendly-synthesis-reduced-graphene-oxide-spent-lithium-ion-battery-graphite-and01107nas a2200301 4500008004100000022001400041245021200055210006900267260000900336300001600345490000700361653002600368653002300394653002200417653002100439100002300460700001700483700002200500700001800522700001900540700001800559700001900577700001500596700001900611700002800630700002300658856012400681 2024 eng d a0272-884200aReconstituting the microstructural properties and ionic conductivity of copper - doped yttria-stabilized zirconia via mechanochemical synthesis for intermediate-temperature solid oxide fuel cell applications0 aReconstituting the microstructural properties and ionic conducti cOCT  a35178-351920 v5010aELECTRICAL-PROPERTIES10aOPTICAL-PROPERTIES10aTHERMAL-STABILITY10aTRANSITION-METAL1 aMomin, Naeemakhtar1 aManjanna, J.1 aKobayashi, Satoru1 aAruna, S., T.1 aKumar, Senthil1 aAhmad, Tokeer1 aNayaka, G., P.1 aMubeen, B.1 aSabale, Sandip1 aKangralkari, Mrunal, V.1 aKeri, Rangappa, S. uhttps://library.ncl.res.in/content/reconstituting-microstructural-properties-and-ionic-conductivity-copper-doped-yttria02491nas a2200253 4500008004100000245013900041210006900180260000800249300001400257490000600271520158800277653002001865653002301885653001701908653003101925653002101956653003301977100002402010700002002034700001802054700001902072700001702091856012902108 2025 eng d00aPhotocatalytic hydrogen evolution by MoO3@g-C3N4 and MoO3@f-MWCNT nanocomposites in deionized and natural seawater under visible light0 aPhotocatalytic hydrogen evolution by MoO3gC3N4 and MoO3fMWCNT na cMAR a7175-71890 v83 a

Visible-light-driven photocatalysts are predominantly useful for converting solar to hydrogen energy via photocatalytic water-splitting reactions. The heterojunction composite materials have exhibited remarkable advantages for visible-light photocatalytic H-2 evolution. We have successfully synthesized MoO3@f-MWCNT and MoO3@g-C3N4 nanocomposites and characterized them using PXRD, UV-DRS, Raman spectroscopy, XPS, PL, TRPL, FE-SEM, HR-TEM, BET, and photocurrent. The photocatalytic water-splitting efficiency of MoO3@f-MWCNT and MoO3@g-C3N4 was measured under visible light (lambda >= 420 nm) irradiation using TEOA as a sacrificial reagent in DI water and natural seawater. The H-2 evolution rate in DI water for MoO3@f-MWCNT is 2313.56 mu mol g(-)(1) h(-)(1), and for MoO3@g-C3N4 is 2530.35 mu mol g(-1) h(-1) with an apparent quantum efficiency (AQE) of 6.38 and 6.93%, respectively. In natural seawater, the H-2 evolution rate is 2632.20 and 2845.06 mu mol g(-1) h(-1), with an AQE of 7.21 and 7.77%, respectively. The rate of H-2 evolution slightly increased in natural seawater than DI water. The Tafel slope values for MoO3@g-C3N4 and MoO3@f-MWCNT are 59 and 92 mV dec(-1), respectively. The lowest Tafel value of MoO3@g-C3N4 exhibited a faster rate of reaction. Thus, the surface interaction between the MoO3 and the porous g-C3N4 materials may create synergistic effects, which facilitate electron transport at the interface and significantly boost the photocatalytic activity. Thus, MoO3@g-C3N4 is a promising photocatalyst for renewable energy production.

10adeionized water10aelectrochemicalHER10aMoO3@f-MWCNT10aMoO3@g-C3N4 nanocomposites10anatural seawater10aphotocatalytic H-2 evolution1 aKangutkar, Raju, S.1 aWalko, Priyanka1 aDhepe, P., L.1 aNayaka, G., P.1 aManjanna, J. uhttps://library.ncl.res.in/content/photocatalytic-hydrogen-evolution-moo3g-c3n4-and-moo3f-mwcnt-nanocomposites-deionized-and