Amphiphilic Ti porous transport layer for highly effective PEM unitized regenerative fuel cells

Title
Amphiphilic Ti porous transport layer for highly effective PEM unitized regenerative fuel cells
Authors
장종현김진영박현서박희영김종민정희윤임영준임아연성영은
Keywords
연료전지; 수전해; 수소; 전기화학; 재생연료전지
Issue Date
2021-03
Publisher
Science Advances
Citation
VOL 7, eabf7866
Abstract
Polymer electrolyte membrane unitized regenerative fuel cells (PEM-URFCs) require bifunctional porous transport layers (PTLs) to play contradictory roles in a single unitized system: hydrophobicity for water drainage in the fuel cell (FC) mode and hydrophilicity for water supplement in the electrolysis cell (EC) mode. Here, we report a high-performance amphiphilic Ti PTL suitable for both FC and EC modes, thanks to alternating hydrophobic and hydrophilic channels. To fabricate the amphiphilic PTL, we used a shadow mask patterning process using ultrathin polydimethylsiloxane (PDMS) brush as a hydrophobic surface modifier, which can change the Ti PTL’s surface polarity without decreasing its electrical conductivity. Consequently, performance improved by 4.3 times in FC (@ 0.6 V) and 1.9 times in EC (@ 1.8 V) from amphiphilic PTL. To elucidate reason for performance enhancement, discrete gas emission through the hydrophobic channels in amphiphilic PTL was verified under scanning electrochemical microscopy.
URI
http://pubs.kist.re.kr/handle/201004/72999
ISSN
2375-2548
Appears in Collections:
KIST Publication > Article
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