Overcoming the Activity-Stability Trade-Off in Electrocatalysts via Unconventional Two-Step Structural Reconstructions of Amorphous Oxides.

The activation of lattice oxygen in oxide catalysts via structural reconstruction is critical for optimizing the catalytic performance in oxidation-reduction systems. However, in electrochemical O evolution, the structural transformations preceding electrochemical reconstruction and their impact on the resulting structural inhomogeneity have long remained insufficiently understood. Here, we activate the lattice oxygen of the W-doped Co-Fe amorphous oxide through spontaneous and electrochemical bulk reconstructions.

Luminescence-Monitored Progressive Chemical Pressure Implementation Realized through Successive Y and Mg Doping into Ca(PO):Eu.

Chemical pressure generated through ion doping into crystal lattices has been proven to be conducive to exploration of new matter, development of novel functionalities, and realization of unprecedented performances. However, studies are focusing on one-time doping, and there is a lack of both advanced investigations for multiple doping and sophisticated strategies to precisely and quantitatively track the gradual functionality evolution along with progressive chemical pressure implementation. Herein, high-valent Y and equal-valent Mg is successively doped to replace multiple Ca sites in Ca(PO):Eu.

Understanding the Doping Chemistry of High Oxidation States in Scheelite CaWO by Hydrothermal Conditions.

Doping chemistry has become one of the most effective means of tuning materials' properties for diverse applications. In particular for scheelite-type CaWO, high-oxidation-state doping is extremely important, since one may expand the scheelite family and further create prospective candidates for novel applications and/or useful spectral signatures for nuclear forensics. However, the chemistry associated with high-valence doping in scheelite-type CaWO is far from understanding.