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Title: Mass-transport properties of electrosprayed Pt/C catalyst layers for polymer-electrolyte fuel cells

Abstract

Mass-transport properties of electrosprayed catalyst-layers based on Pt/C and ionomer (Nafion) are investigated with hydrogen limiting-current technique, water-vapor-uptake, scanning transmission microscopy (STEM), single-cell testing, and impedance spectroscopy. The hydrogen limiting-current technique provides the transport resistance of the layers ( RCLmt), which demonstrates to be lower in electrosprayed layers compared with conventional layers, especially at very low platinum loadings (0.025 mg Pt·cm -2) and low cell temperature, denoting superior mass-transport properties. Images of the distribution of Pt, F, and C elements reveal the ionomer preferentially interacting with the Pt nanoparticles. Water-vapor-uptake experiments show larger vapor absorption for electrosprayed than conventional catalyst layers. Such large water-vapor uptake capability is combined with superhydrophobicity, ie. very low interaction with water in liquid phase (wettability). Both apparently contradictory properties result from a particular configuration of the amphiphilic ionomer in the electrosprayed layers, and provide ideal conditions for high mass transport and ionic conductivity in a catalyst layer. Electrosprayed layers as cathode catalyst layers reflect peak response at a loading of 0.17 mg Pt·cm -2 (18 μm layer thickness when using Pt/C 20 wt% catalyst) where they provide minimal mass-transport and polarization resistances.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [2];  [2];  [3]; ORCiD logo [2]
  1. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1531234
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 427; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; PEMFC; Catalyst layer; Electrospray; Mass transport; Water uptake; Thin porous film

Citation Formats

Conde, Julio J., Folgado, M. Antonia, Ferreira-Aparicio, P., Chaparro, Antonio M., Chowdhury, Anamika, Kusoglu, Ahmet, Cullen, David, and Weber, Adam Z. Mass-transport properties of electrosprayed Pt/C catalyst layers for polymer-electrolyte fuel cells. United States: N. p., 2019. Web. doi:10.1016/j.jpowsour.2019.04.079.
Conde, Julio J., Folgado, M. Antonia, Ferreira-Aparicio, P., Chaparro, Antonio M., Chowdhury, Anamika, Kusoglu, Ahmet, Cullen, David, & Weber, Adam Z. Mass-transport properties of electrosprayed Pt/C catalyst layers for polymer-electrolyte fuel cells. United States. doi:10.1016/j.jpowsour.2019.04.079.
Conde, Julio J., Folgado, M. Antonia, Ferreira-Aparicio, P., Chaparro, Antonio M., Chowdhury, Anamika, Kusoglu, Ahmet, Cullen, David, and Weber, Adam Z. Wed . "Mass-transport properties of electrosprayed Pt/C catalyst layers for polymer-electrolyte fuel cells". United States. doi:10.1016/j.jpowsour.2019.04.079.
@article{osti_1531234,
title = {Mass-transport properties of electrosprayed Pt/C catalyst layers for polymer-electrolyte fuel cells},
author = {Conde, Julio J. and Folgado, M. Antonia and Ferreira-Aparicio, P. and Chaparro, Antonio M. and Chowdhury, Anamika and Kusoglu, Ahmet and Cullen, David and Weber, Adam Z.},
abstractNote = {Mass-transport properties of electrosprayed catalyst-layers based on Pt/C and ionomer (Nafion) are investigated with hydrogen limiting-current technique, water-vapor-uptake, scanning transmission microscopy (STEM), single-cell testing, and impedance spectroscopy. The hydrogen limiting-current technique provides the transport resistance of the layers (RCLmt), which demonstrates to be lower in electrosprayed layers compared with conventional layers, especially at very low platinum loadings (0.025 mgPt·cm-2) and low cell temperature, denoting superior mass-transport properties. Images of the distribution of Pt, F, and C elements reveal the ionomer preferentially interacting with the Pt nanoparticles. Water-vapor-uptake experiments show larger vapor absorption for electrosprayed than conventional catalyst layers. Such large water-vapor uptake capability is combined with superhydrophobicity, ie. very low interaction with water in liquid phase (wettability). Both apparently contradictory properties result from a particular configuration of the amphiphilic ionomer in the electrosprayed layers, and provide ideal conditions for high mass transport and ionic conductivity in a catalyst layer. Electrosprayed layers as cathode catalyst layers reflect peak response at a loading of 0.17 mgPt·cm-2 (18 μm layer thickness when using Pt/C 20 wt% catalyst) where they provide minimal mass-transport and polarization resistances.},
doi = {10.1016/j.jpowsour.2019.04.079},
journal = {Journal of Power Sources},
number = C,
volume = 427,
place = {United States},
year = {2019},
month = {6}
}

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This content will become publicly available on June 12, 2020
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