Electric Field-Controlled Multistep Proton Evolution in H _x SrCoO_2.5 with Formation of H-H Dimer.

ABSTRACT: Ionic evolution-induced phase transformation can lead to wide ranges of novel material functionalities with promising applications. Here, using the gating voltage during ionic liquid gating as a tuning knob, the brownmillerite SrCoO_2.5 is transformed into a series of protonated H _x SrCoO_2.5 phases with distinct hydrogen contents. The unexpected electron to charge-neutral doping crossover along with the increase of proton concentration from x = 1 to 2 suggests the formation of exotic charge neutral H-H dimers for higher proton concentration, which is directly visualized at the vacant tetrahedron by scanning transmission electron microscopy and then further supported by first principles calculations. Although the H-H dimers cause no change of th

SUBMITTER: Li HB 

PROVIDER: S-EPMC6794722 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature