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

Title
Highly efficient oxygen evolution reaction via facile bubble transport realized by three-dimensionally stack-printed catalysts
Authors
채근화김진영박현서김종민임아연김예지임동훈조유진한혁진전기웅김무현이군호이규락안현서김형수정연식
Issue Date
2020-10
Publisher
Nature Communications
Citation
VOL 11, 4921
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, highlyordered 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 contributor to the improved ECSA-specific activity. The 3D nanostructuring-based improvement of ECSA and ECSA-specific activity enables our well-controlled geometry to afford a 30-fold higher mass activity of the OER catalyst when used in a single-cell PEMWE than conventional nanoparticle-based catalysts.
URI
http://pubs.kist.re.kr/handle/201004/72013
ISSN
2041-1723
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KIST Publication > Article
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