Demonstrating the source of inherent instability in NiFe LDH-based OER electrocatalysts.

ABSTRACT: Nickel-iron layered double hydroxides are known to be one of the most highly active catalysts for the oxygen evolution reaction in alkaline conditions. The high electrocatalytic activity of the material however cannot be sustained within the active voltage window on timescales consistent with commercial requirements. The goal of this work is to identify and prove the source of inherent catalyst instability by tracking changes in the material during OER activity. By combining in situ and ex situ Raman analyses we elucidate long-term effects on the catalyst performance from a changing crystallographic phase. In particular, we attribute electrochemically stimulated compositional degradation at active sites as the principal cause of the sharp loss of activity from NiFe LDHs short

SUBMITTER: Tyndall D 

PROVIDER: S-EPMC9942694 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature