The Principle of Introducing Halogen Ions Into β-FeOOH: Controlling Electronic Structure and Electrochemical Performance.

ABSTRACT: Coordination tuning electronic structure of host materials is a quite effective strategy for activating and improving the intrinsic properties. Herein, halogen anion (X^-)-incorporated β-FeOOH (β-FeOOH(X), X = F^-, Cl^-, and Br^-) was investigated with a spontaneous adsorption process, which realized a great improvement of supercapacitor performances by adjusting the coordination geometry. Experiments coupled with theoretical calculations demonstrated that the change of Fe-O bond length and structural distortion of β-FeOOH, which is rooted in halogen ions embedment, led to the relatively narrow band gap. Because of the strong electronegativity of X^-, the Fe element in β-FeOOH(X)s presented the unexpected high valence state (3 + δ), which i

SUBMITTER: Zhang D 

PROVIDER: S-EPMC7770722 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature