Amphiphilic Ti porous transport layer for highly effective PEM unitized regenerative fuel cells
- Amphiphilic Ti porous transport layer for highly effective PEM unitized regenerative fuel cells
- 장종현; 김진영; 박현서; 박희영; 김종민; 정희윤; 임영준; 임아연; 성영은
- 연료전지; 수전해; 수소; 전기화학; 재생연료전지
- Issue Date
- Science Advances
- VOL 7, eabf7866
- 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.
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