Effects of cation vacancies at tetrahedral sites in cobalt spinel oxides on oxygen evolution catalysis
نویسندگان
چکیده
The dissolution of substituted Zn 2+ ions in Co–Al spinel oxides leads to cation vacancies at the tetrahedral sites, promoting adsorption process OH − for charge compensation and enhancing activity oxygen evolution catalysis.
منابع مشابه
Uncovering the roles of oxygen vacancies in cation migration in lithium excess layered oxides.
A novel oxygen vacancy assisted transition metal (TM) diffusion mechanism is proposed for the first time to explain the near-surface phase transformation in lithium excess transition metal layered oxides. Oxygen vacancies and TM migration have been observed at nm scale spatial resolution by Scanning Transmission Electron Microscopy and Electron Energy Loss Spectroscopy. Formation of (dilute) ox...
متن کاملPhase evolution of layered cobalt oxides versus varying corrugation of the cobalt-oxygen basal plane
A general spin-state model and a qualitative physical picture have been proposed for a class of lately synthesized layered cobalt oxides (LCOs) by means of density functional calculations. As the plane corrugation of the cobalt-oxygen layer decreases, the LCOs evolve from a high-spin (HS) superexchangecoupled antiferromagnetic (AFM) insulator to an almost-HS AFM/ferromagnetic (FM) competing sys...
متن کاملMultiscale simulation on electromigration of the oxygen vacancies in metal oxides
The energetics and dynamics of electromigration of the oxygen vacancy is investigated with first-principles calculations and kinetic Monte Carlo methods. To simulate the charged oxygen vacancy under external fields within the first-principles approach, we introduce a slab model with electron-accepting dopants in the surface. The analysis of the density of states confirms that the oxygen vacanci...
متن کاملSpinel-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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Materials advances
سال: 2022
ISSN: ['2633-5409']
DOI: https://doi.org/10.1039/d2ma00729k