An electrochemically reversible lattice with redox active A-sites of double perovskite oxide nanosheets to reinforce oxygen electrocatalysis.

ABSTRACT: The catalyst surface undergoes reversible structural changes while influencing the rate of redox reactions, the atomistic structural details of which are often overlooked when the key focus is to enhance the catalytic activity and reaction yield. We achieve chemical synthesis of ∼5 unit cell thick double perovskite oxide nanosheets (NSs) and demonstrate their precise structural reversibility while catalyzing the successive oxygen evolution and reduction reactions (OER/ORR). 4.1 nm thick A-site ordered BaPrMn_1.75Co_0.25O_5+δ (δ = 0.06-0.17) NSs with oxygen deficient PrO _x terminated layers have flexible oxygen coordination of Pr³⁺ ions, which promotes the redox processes. When subjected to systematic oxidation and red

SUBMITTER: Majee R 

PROVIDER: S-EPMC8162365 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature