Non-metal/metalloid modification of perovskite oxide enables lattice oxygen participation in accelerating oxygen evolution activity

Zr and Ir Codoped Perovskite Nanosheets for Efficient and Stable Oxygen Evolution

“…Therefore, the performance of the doped samples was significantly improved compared to that of SCF. Moreover, oxygen vacancies had been found to tune the electronic structure, providing a significant catalytic performance improvement for perovskite oxide electrocatalysts. , As shown in Figure c, the O 1s spectra exhibited four subordinate peaks located at 529.10 eV (lattice oxygen O 2– ), 530.10 eV (highly oxidative oxygen O – /O 2 2– ), 531.30 eV (hydroxyl groups or surface-adsorbed oxygen OH – /O 2 ), and 532.78 eV (adsorbed molecular water H 2 O). , Both highly oxidative oxygen O – /O 2 2– and hydroxyl groups OH – were closely associated with catalytic activity. , The SCFI, SCFZ, and SCFZI catalysts showed higher O – /O 2 2– species than SCF, which was active for catalyzing OER, thus contributing to the improvement of the catalytic activity. , Additionally, the O 1s spectra revealed that the areas of the OH – /O 2 peak for the samples decreased following Zr/Ir doping (Figure d), suggesting a reduction in the binding strength with active intermediates . And the moderated binding strength for intermediates might facilitate the dissociation of O–H bonds, thereby accelerating the deprotonation process and improving OER activity .…”

Fe-Doped SrCoOx FET Sensors for Extreme Alkaline pH Sensing

“…Perovskite oxides hold great promise as candidate materials for field effect transistors (FETs), sensors, and memristors due to their rich electronic properties. − The adjustable oxygen vacancies in these materials act as tunable defects that can influence surface reactions and the electronic states of adsorbates. By modulating these vacancies, it is possible to transform insulating and semiconducting oxides into metallic conductors, modify magnetic properties, and enhance ion conductivity. − The precise measurement of pH, particularly in highly alkaline environments, is a critical parameter in various industrial processes, including metal smelting, leatherworking, papermaking, nuclear fuel reprocessing, and waste treatment. − Recent scientific endeavors have focused on pH sensing in highly alkaline conditions, resulting in the discovery of promising materials and devices. Li et al developed a polybisphenol-based pH electrode that exhibited a good potentiometric response across a pH range of 0 to 15 .…”

One-Dimensional Self-Assembled Heterostructured Perovskite Hybrid for Oxygen Reduction and Zn–Air Batteries

“…Among the alternative non-precious oxide electrocatalysts, perovskite oxides (ABO 3 ) are recognized as the superior ones. ,− In addition to low cost, perovskite oxides have other apparent benefits, such as their structure and composition flexibility. A significant number of investigations have recently demonstrated that perovskite oxides have prominent activity and good stability. − Particularly, the intrinsic activity has been associated with the orbital electron filling (e g ) and the covalency between B and O of ABO 3 .…”