Oxidation States Regulation of Cobalt Active Sites through Crystal Surface Engineering for Enhanced Polysulfide Conversion in Lithium-Sulfur Batteries.

ABSTRACT: In this work, unique Co₃ O₄ /N-doped reduced graphene oxide (Co₃ O₄ /N-rGO) composites as favorable sulfur immobilizers and promoters for lithium-sulfur (Li-S) batteries are developed. The prepared Co₃ O₄  nanopolyhedrons (Co₃ O₄ -NP) and Co₃ O₄  nanocubes mainly expose (112) and (001) surfaces, respectively, with different atomic configurations of Co²⁺ /Co³⁺ sites. Experiments and theoretical calculations confirm that the octahedral coordination Co³⁺ (Co³⁺ _Oh ) sites with different oxidation states from tetrahedral coordination Co²⁺ sites optimize the adsorption and catalytic conversion of lithium polysulfides. Spec

SUBMITTER: Xiao R 

PROVIDER: S-EPMC9631056 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature