Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 16, Pages 14189-14194Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02917
Keywords
Proton exchange membrane fuel cells; Graphene oxide membrane; Proton conductivity; Thinning of 2D-layer stacking; Fuel crossover
Categories
Funding
- DST-SERB
- DST Nanomission
- MHRD FIST
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Graphene oxide (GO) contains randomly distributed nonconductive sp(3)-C domains with planar acidity, making it simultaneously an electrical insulator and a proton conductor. GO's ability for in-plane and through-plane cationic transport together with its impermeability to molecular fuels projected them as inexpensive and sustainable membranes for proton exchange membrane fuel cells (PEMFCs). Nevertheless, the room-temperature proton transport in bulk GO is at least an order lower than that of the state of the art Nafion membrane, challenging the construction of a practical energy conversion device with the former. We show that the proton flux in GO along the H-bonded network projected outward of the carbon planes can be significantly amplified by thinning the 2D carbon layer stacking of carbon nanosheets in GO. The noticeably higher room-temperature fuel cell performance metrics of a thin-layer GO proton conductor compared to the commercial Nafion membrane with similar to 410 mW/cm(2) of peak power at 1300 mA/cm(2) of peak current demonstrates distinct progress in the sustainable energy landscape.
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