There are some materials that trap moisture like polyolefin meshes but these are non-conducting. Some materials like carbon cloth are conducting and porous but are hydrophobic mostly. So the actual question is how can one make conducting polyolefin meshes or hydrophilic carbon cloth?
Yes, there are. Conducting polymers can help you.
Please see the attached file.
soak carbon cloth into silica nano dispersion, and dry it around 80ºC.
You might find more insight about the silicon coating on GDL with one of my papers, published in 2011. titled "Development and impact of sandwich wettability structure for gas distribution media on PEM fuel cell performance"
Few Carbon papers as well are electrically conducting, porous as well hydrophilic. Sigracet AA series are predominantly hydrophilic as there is no PTFE coating.
https://www.fuelcellsetc.com/store/DS/SGL-GDL_10.pdf
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