Highly efficient oxygen evolution reaction via facile bubble transport realized by three-dimensionally stack-printed catalysts
- Highly efficient oxygen evolution reaction via facile bubble transport realized by three-dimensionally stack-printed catalysts
- 채근화; 김진영; 박현서; 김종민; 임아연; 김예지; 임동훈; 조유진; 한혁진; 전기웅; 김무현; 이군호; 이규락; 안현서; 김형수; 정연식
- Issue Date
- Nature Communications
- VOL 11, 4921
- 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.
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