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Chemicals, plastics and rubber industries

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Polymer electrolyte membranes incorporated with nanometer-size particles of Pt and/or metal-oxides: experimental analysis of the self-humidification and suppression of gas-crossover in fuel cells

Article Abstract:

The manner by which water behaved in different polymer electrolyte membranes (PEM) without external humidification, how self-humidification was acquired and the reason for the achievement of high performance at polymer electrolyte fuel cells with new PEMs were explained. PEFCs are the main power source for portable electric devices and electric vehicles. It was discovered that the consistent average specific resistance reflecting water distribution in PEMs was absolutely vital in the achievement of high-performance PEFCs.

Author: Watanabe, Masahiro, Uchida, Hiroyuki, Emori, Masaomi
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
Research, Particles, Particulate matter, Electrochemistry, Polyelectrolytes, Fuel cells

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Electron tomography of Nafion ionomer coated on Pt/carbon black in high utilization electrode for PEFCs

Article Abstract:

The superiority of newly developed electrocatalyst layer (ECL) for polymer electrolyte fuel cells is confirmed by analyzing the three-dimensional (3D) dispersion states of Nafion ionomer in Pt/carbon black agglomerates by using electron tomography based on multi TEM images taken at different tilt angles. The results have displayed a uniform distribution of the ionomer, proving the high catalyst utilization in the new ECL distinctive from that of the conventional one.

Author: Watanabe, Masahiro, Uchida, Hiroyuki, Jung Min Song, Suzuki, Shinsuke, Nakazawa, Eiko, Baba, Norio
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
Platinum, Usage, Tomography, Chemical properties, Ionomers

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Temperature dependence of CO-tolerant hydrogen oxidation reaction activity at Pt, Pt-Co, and Pt-Ru electrodes

Article Abstract:

The temperature dependence of CO-tolerant H2 oxidation reaction (HOR) activity at Pt, Pt-Co, and Pt-Ru electrodes in 0.1 M HClO4 solution is examined with a channel flow electrode at 30 to 90 degree Celsius. Results reveal for these alloys that the CO adsorption rate is much slower than that of Pt and the HOR site are not so rigidly blocked by adsorbed CO due to its enhanced mobility, resulting from their modified electronic structure of surface Pt sites.

Author: Watanabe, Masahiro, Uchida, Hiroyuki, Izumi, Kenji
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Ruthenium, Cobalt Compounds, Electric properties, Platinum compounds

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