Electrocatalysis of Oxygen on Bifunctional Nickel‐Cobaltite Spinel

Phase and composition controllable synthesis of cobalt manganese spinel nanoparticles towards efficient oxygen electrocatalysis

Spinel-type oxides are technologically important in many fields, including electronics, magnetism, catalysis and electrochemical energy storage and conversion. Typically, these materials are prepared by conventional ceramic routes that are energy consuming and offer limited control over shape and size. Moreover, for mixed-metal oxide spinels (for example, Co(x)Mn(3-x)O4), the crystallographic p...

Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides

Nitrogen-containing electrocatalysts, such as metal–nitrogen–carbon (M–N–C) composites and nitrogen-doped carbons, are known to exhibit high activities for an oxygen reduction reaction (ORR). Moreover, even if the mechanism by which nitrogen improves the activities is not completely understood, a strong electronic interaction between nitrogen and active sites has been found in these composites....

Spinel-type lithium cobalt oxide as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions.

Development of efficient, affordable electrocatalysts for the oxygen evolution reaction and the oxygen reduction reaction is critical for rechargeable metal-air batteries. Here we present lithium cobalt oxide, synthesized at 400 °C (designated as LT-LiCoO2) that adopts a lithiated spinel structure, as an inexpensive, efficient electrocatalyst for the oxygen evolution reaction. The catalytic act...

Nature of oxygen at rocksalt and spinel oxide surfaces

Oxygen, magnesium and chromium isotopic ratios of presolar spinel grains

Oxygen isotopic measurements of 20 spinel (MgAl2O4) grains from the CM2 meteorite Murray (average diameter 0.45 m), seven spinel grains from ordinary chondrites (OC, 0.3 to 2 m) and three spinel grains from the CI chondrite Orgueil (0.4 to 0.7 m) have revealed large anomalies and thus established their presolar origin. Their O isotopic ratios fall into all four previously defined groups and ind...