Results 81 to 90 of about 5,714 (305)
Reinforcing Oxygen Activation of Spinel Oxide via Mn─O Covalency Engineering for VOCs Oxidation
Advanced Science, EarlyView.A MnCo spinel catalyst with weakened Mn─O covalency was synthesized via a hard‐template method. The reduced Mn─O covalency facilitates localized electron redistribution, promoting the activation of both molecular oxygen and lattice oxygen, and thereby enabling the efficient and complete oxidation of VOCs (ethyl acetate, toluene, and propane).
Gan Li +8 more
wiley +1 more source
Boletín de la Sociedad Española de Cerámica y Vidrio, 2004 In this work some aspects related to the synthesis of nickel aluminate as a ceramic material by the sol–gel processing, are studied. The solids obtained are analyzed by atomic absorption and x ray flourescence in order to determine their chemical ...
Valencia, J. S., Almanza, A.
doaj
Tailored Catalytic Microenvironments Enable Efficient Electrochemical Ammonia Production
Advanced Science, EarlyView.This study shows that Co2+ substitution in inverse spinel FeFeCoO4 constructs an integrated catalytic microenvironment for efficient nitrate‐to‐ammonia reduction. Jahn–Teller distortion activates Fe sites for *H generation, while hard–soft acid–base regulated dual‐metal sites optimize proton‐coupled electron transfer and intermediate adsorption ...
Qi Zhang +8 more
wiley +1 more source
Al-rich spinels in primitive arc volcanics
, 1995 Al-rich spinels (100Cr/(Cr + Al) 50 wt%) are common in alpine peridotites, both terrestrial and lunar mafic and ultramafic cumulates, and in certain metamorphic rocks, but they are apparently rare in terrestrial volcanic rocks.
Vadim Kamenetsky (14740705) +4 more
core
Carboxyphenolate Coordination Frameworks for High‐Voltage Calcium Storage
Advanced Science, EarlyView.A hexaanionic carboxyphenolate coordination framework, Ca2‐M‐THBPD (M = Mg, Ca, Ba), exhibits ligand‐centered enolate‐quinonoid redox activity enabling tunable, high‐voltage Ca2+ storage (3.5 V vs Ca2+/Ca) modulated by spectator cations. The amorphous structure accommodates reversible divalent‐ion insertion, contributing to enhanced cycling stability ...
Vasudeva Rao Bakuru +12 more
wiley +1 more source
Infrared studies of spinels—V. Lithium spinels of the type LiXY4O8
Spectrochimica Acta Part A: Molecular Spectroscopy, 1973 Abstract The i.r. spectrum of ordered spinels LiXIIIYIII4O8(XIII = Ga, Fe, In; YIII = Cr, Rh) are discussed and assigned with the help of 6Li-7Li isotopio shifts. Two bands only may be assigned to definite motions of specific cations or coordinated groups: one band in the 450–350 cm−1 region exhibits an important 6Li-7Li isotopic shift and is ...
Tarte, Pierre, Preudhomme, J.
openaire +2 more sources
, 2014 Synthetic and natural spinel single crystals having compositions approaching spinel end-members MgAl2O4, CoAl2O4, FeAl2O4, ZnAl2O4, MgCr2O4 and ZnCr2O4 were investigated by Raman spectroscopy in the 100-900 cm-1 range using the excitation of the blue 473.
D'IPPOLITO, VERONICA +3 more
core
, 2005 Serpentinized harzburgites from southern Tuscany (Italy) host different kinds of spinels: (a) relic, magmatic Al-spinels, (b) hydrothermally altered spinels, occurring as "ferritchromit" rims, (c) syn- and post-serpentinization magnetites.
RUMORI, C., MELLINI, M., VITI, C.
core +1 more source
Enrichment of Rh, Ru, Ir and Os in Cr spinels from oxidized magmas: evidence from the Ambae volcano, Vanuatu [PDF]
, 2016 Experimental studies, performed under oxidized conditions (fO2>QFM+2, where QFM is quartz-fayalite-magnetite oxygen buffer), have shown that Rh, Ru, Ir and Os are strongly compatible with Cr spinel, whereas empirical studies of Cr spinels from ultramafic-
Eggins, Stephen +2 more
core +2 more sources
Advanced Science, EarlyView.A mechanically adaptive polyimide interface dynamically stabilizes single‐crystal cathodes in sulfide all‐solid‐state batteries. By integrating robust chemical coordination with viscoelastic compliance, this smart coating suppresses parasitic reactions and accommodates cyclic volume expansion.
Jiatao Wu +8 more
wiley +1 more source