Highly efficient oxygen evolution reaction via facile bubble transport realized by three-dimensionally stack-printed catalysts.

ABSTRACT: Despite highly promising characteristics of three-dimensionally (3D) nanostructured catalysts for the oxygen evolution reaction (OER) in polymer electrolyte membrane water electrolyzers (PEMWEs), universal design rules for maximizing their performance have not been explored. Here we show that woodpile (WP)-structured Ir, consisting of 3D-printed, highly-ordered Ir nanowire building blocks, improve OER mass activity markedly. The WP structure secures the electrochemically active surface area (ECSA) through enhanced utilization efficiency of the extended surface area of 3D WP catalysts. Moreover, systematic control of the 3D geometry combined with theoretical calculations and various electrochemical analyses reveals that facile transport of evolved O₂ gas bubbles is an important c

SUBMITTER: Kim YJ 

PROVIDER: S-EPMC7529785 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature