Amphiphilic Ti porous transport layer for highly effective PEM unitized regenerative fuel cells
| Autor: | Hui-Yun Jeong, Jong Min Kim, Jong Hyun Jang, Youngjoon Lim, Jin Young Kim, Hee-Young Park, Yung-Eun Sung, Ahyoun Lim, Hyun S. Park |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Electrolytic cell 02 engineering and technology Electrolyte 010402 general chemistry 01 natural sciences chemistry.chemical_compound Scanning electrochemical microscopy Engineering Amphiphile Electrochemistry Bifunctional Research Articles chemistry.chemical_classification Multidisciplinary Polydimethylsiloxane SciAdv r-articles Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Membrane Chemical engineering chemistry embryonic structures 0210 nano-technology Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| DOI: | 10.1126/sciadv.abf7866 |
| Popis: | Amphiphilic transport layer enables facile mass transportation of both gas and water for highly efficient PEM unitized fuel cells. 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. |
| Databáze: | OpenAIRE |
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