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Controlling Fuel Crossover & Hydration in Ultra-thin Proton Exchange Membrane-based fuel Cells Using Pt-Nanosheet Catalysts

Authors Wang, Rujie HKUST affiliated (currently or previously)
Zhang, Wenjing HKUST affiliated (currently or previously)
He, Gaohong
Gao, Ping View this author's profile
Issue Date 2014
Source Journal of Materials Chemistry A: Materials for energy and sustainability , v. 2, (39), October 2014, p. 16416-16423
Summary An ultra-thin proton exchange membrane with Pt-nanosheet catalysts was designed for a self-humidifying fuel cell running on H-2 and O-2. In this design, an ultra-thin Nation membrane was used to reduce ohmic resistance. Pt nanocatalysts were uniformly anchored on exfoliated, layered double hydroxide (LDH) nanosheets by chemical vapor deposition. After embedding Pt-LDH nanocatalysts in 9 mu m-thick Nation membranes, exfoliated LDH nanosheets effectively captured crossovered H-2 and O-2 through the membranes. Meanwhile, Pt nanocatalysts on LDH nanosheets catalyzed reactions between captured H-2 and O-2 and provided in situ hydration inside Nation membranes to maintain their proton conductivity level. Furthermore, LDH nanosheets reinforced the Nation membranes, with 181% improvement in tensile modulus and 166% improvement in yield strength. In a hydrogen fuel cell running with dry fuel, the membrane-electrode assembly employing the Pt-LDH/Nafion membrane showed an improvement of 200% in maximum power density, an increase of 197% in current density at 0.3 V and an improvement of 497% in current density at 0.5 V as compared to those with Nation 211. The Pt-LDH/Nafion membrane with a thickness of 9 mu m exhibited a combination of desirable properties for the development of affordable and durable hydrogen fuel cell technology, including better mechanical properties, higher open-circuit voltage, lower ohmic resistance and enhanced water management in a hydrogen fuel cell without external humidification.
ISSN 2050-7488
Language English
Format Article
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