Results 51 to 60 of about 7,996 (167)

Perovskite‐Based Catalysts for the Oxygen Evolution Reaction: Synthesis, Device Relevant Performance, and Scale‐Up Strategies

Small, EarlyView.
Perovskites are emerging as catalysts for acidic oxygen evolution in proton exchange membrane water electrolyzers. This manuscript focuses on catalyst behavior under device‐relevant conditions, highlighting surface reconstruction, elemental utilization, and membrane electrode assembly performance. By linking materials design with electrolyzer operation,
Jala Bib Khan, Norbert Kazamer, Marco Brand, Tim Hülser, Clemens Pollerberg, Ulrich Rost   +5 more
wiley   +1 more source

Synthesis, Phase Formation, and Raman Spectroscopy of Ni and Zn(Mg) Codoped Bismuth Stibate Pyrochlore

Chemistry
Complex antimony pyrochlores Bi2.7M0.46Ni0.70Sb2O10+Δ (M = Zn, Mg) were synthesized from oxide precursors, using the solid-state reaction method.
Nadezhda A. Zhuk, Sergey V. Nekipelov, Olga V. Petrova, Boris A. Makeev, Sergey I. Isaenko, Maria G. Krzhizhanovskaya, Kristina N. Parshukova, Roman I. Korolev, Ruslana A. Simpeleva   +8 more
doaj   +1 more source

Synthesis, structure and electrical properties of Mg-, Ni-codoped bismuth niobates

Chimica Techno Acta, 2017
Mg-, Ni-codoped bismuth niobates Bi1.6Mg0.8-xNixNb1.6O7-δ (x = 0; 0.2; 0.4; 0.6; 0.8) were obtained by conventional solid-state reaction method. It was shown that the Mg atoms are distributed at the Nb sites while the Ni atoms are distributed over the Bi-
M. S. Koroleva, I. V. Piir, E. I. Istomina   +2 more
doaj   +1 more source

High‐purity X‐ray polarimetry at high energies for Mössbauer spectroscopy

Journal of Synchrotron Radiation, EarlyView.
This work extends high‐purity X‐ray polarimetry into the 15–30 keV range, enabling polarization‐filtered synchrotron Mössbauer spectroscopy of higher‐energy nuclear resonances. A proof‐of‐principle experiment at 22.494 keV demonstrates a polarization purity of (1.2 ± 0.5) × 10−8, establishing the feasibility of the approach.High‐purity X‐ray ...
Berit Marx-Glowna, Ingo Uschmann, Robert Loetzsch, Willi Hippler, Judith Görs, Tony Wunderlich, Sakshath Sadashivaiah, Martin Tolkiehn, Gerhard G. Paulus, Ralf Röhlsberger   +9 more
wiley   +1 more source

Glass from Teniky (Madagascar): Geochemical Evidence for Multiple Production Systems and Long‐Distance Exchange in the Mediaeval Indian Ocean

Archaeometry, EarlyView.
ABSTRACT The inland rock‐cut site of Teniky, located in the Isalo massif of southern Madagascar, represents an exceptional archaeological context recently dated to the 11th–12th centuries ad, corresponding to the early phases of settlement on the island.
Jean Rodier, Bernard Gratuze, Vincent Serneels   +2 more
wiley   +1 more source

Fabrication and characterization of high entropy pyrochlore ceramics [PDF]

, 2022
High-entropy rare-earth (RE) zirconates with pyrochlore structure were successfully fabricated by pressureless and spark plasma sintering. RE2Zr2O7 compound with nominal composition (La0.2Y0.2Gd0.2Nd0.2Sm0.2)Zr2O7 was prepared by simple glycine nitrate ...
Cvijović-Alagić, Ivana, Zagorac, Jelena, Erčić, Jelena, Butulija, Svetlana, Sedlak, Richard, Hanzel, Ondrej, Tatarko, Peter, Lisnichuk, Maksym, Zagorac, Dejan, Matović, Branko   +9 more
core   +1 more source

Radiation resistance of gadolinium zirconate pyrochlore [PDF]

, 2000
The pyrochlore structure-type is a proposed host phase for the immobilization of plutonium. Previous studies have shown that a wide variety of actinide pyrochlores can be synthesized.
Weber, W. J., Wang, S. X., Wang, L. M., Kutty, K. V. Govidan, Ewing, Rodney C.   +4 more
core   +1 more source

Reconstructed Bi‐Sn Interfacial Sites Coupled with a Supramolecular Cation Cage Enable Low K+ Acidic CO2 Electroreduction to Formate

Advanced Energy Materials, Volume 16, Issue 36, 23 September 2026.
Pyrochlore‐derived Bi–Sn interfaces enable selective CO2 electroreduction to HCOOH in strongly acidic media (pH = 1). Interfacial electronic coupling promotes *OCHO formation while suppressing hydrogen evolution. Cryptand‐driven cation regulation enriches interfacial K+, maintaining high HCOOH faradaic efficiency of 94% even at low K+ electrolyte ...
Abdelmoniem H. Abu‐Ghazala, Xin Huang, Hsiwen Wu, Paul A. Webley, Shixia Chen, Jun Wang, Jie Zhang   +6 more
wiley   +1 more source

Nanocrystalline Iridium Oxide Stabilized by Magnesium–Titanium–Spinel as Active Acidic Oxygen Evolution Reaction Catalyst

Advanced Energy and Sustainability Research, Volume 7, Issue 9, September 2026.
Iridium–magnesium–titanium spinels increase the mass specific iridium activity and therefore can lower the noble metal loading in PEM water electrolysis. The synthesis of such catalyst is shown and the catalyst is thoroughly characterized. The increase in activity is contributed to the formation of small IrOx clusters in the transitional state from ...
Timo Prölß, Philipp Parzinger, Achim Alkemper, Andreas Hutzler, Abbas Beheshti Askari, Nobutaka Maeda, Jan P. Hofmann, Tanja Franken   +7 more
wiley   +1 more source

Oxidative alteration of Ce-rich pyrochlore: HRTEM/EELS investigation

, 1999
Transmission electron microscopy (TEM) and associated electron energy-loss spectroscopy (EELS) study show intergrowth of Ce4+-rich pyrochlore (metamict) and Ce3+-rich pyrochlore (partially metamict) in a Ce-rich pyrochlore from a rare earth element (REE)
Yifeng Wang, Huifang Xu
core   +1 more source