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 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kim YJ,Lim A,Kim JM,Lim D,Chae KH,Cho EN,Han HJ,Jeon KU,Kim M,Lee GH,Lee GR,Ahn HS,Park HS,Kim H,Kim JY,Jung YSdoi
10.1038/s41467-020-18686-0subject
Has Abstractpub_date
2020-10-01 00:00:00pages
4921issue
1issn
2041-1723pii
10.1038/s41467-020-18686-0journal_volume
11pub_type
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