High-Valence-Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation.

ABSTRACT: Designing an efficient and durable electrocatalyst for the sluggish anodic oxygen evolution reaction (OER) has been the primary goal of using proton exchange membrane electrolyzer owing to the highly acidic and oxidative environment at the anode. In this work, it is reported that high-valence manganese drives the strong anchoring of the Ir species on the manganese dioxide (MnO₂ ) matrix via the formation of an Mn-O-Ir coordination structure through a hydrothermal-redox reaction. The iridium (Ir)-atom-array array is firmly anchored on the Mn-O-Ir coordination structure, endowing the catalyst with excellent OER activity and stability in an acidic environment. Ir-MnO₂ (160)-CC shows an ultralow overpotential of 181 mV at j = 10 mA cm^-2 and maintains long-term

SUBMITTER: Weng Y 

PROVIDER: S-EPMC10015899 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature