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Title: Performance of Polymer Electrolyte Fuel Cell Electrodes with Atomically Dispersed (AD) Fe-C-N ORR Catalyst

Abstract

Activity of (AD)Fe-N-C catalyst with low Fe content is investigated in differential cells prepared by hot pressing anode gas diffusion electrodes (0.2 mgPt/cm2) to N211 membrane and brush painting the cathode catalyst ink. Polarization curves obtained in H2/O2 show double Tafel slopes which, in conjunction with the redox potential observed in cyclic voltammetry traces, forms the basis for a distributed ORR (oxygen reduction reaction) kinetic model with potential-dependent available sites. Application of this model to polarization data in H2/air provides the basis for formulating an oxygen transport model and leads to 7.7 +/- mA0.6 mA/cm2 catalyst activity at 0.9 V, 31.5-34.3 mA/cm2 cell performance at 0.8 V, and 0.8-2 s/cm O2 transport resistance. A coupled kinetic, O2 transport and proton transport illustrates the projected improvements needed in catalyst activity and electrode structure to approach the automotive target of 1000 mW/cm2 stack power density while meeting the 1.45 kW/degrees C heat rejection constraint at 1.5 cathode stoichiometry. The model indicates that we need twelve-fold higher mass activity for reducing the kinetic losses, doubling of active site density and an engineered electrode structure for 50% lower proton transport resistance, as well as a 50% reduction in electrode thickness to limit the O2more » transport losses.« less

Authors:
 [1];  [1];  [2];  [1];  [3];  [2]
  1. Argonne National Laboratory
  2. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  3. Los Alamos National Laboratory
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
OSTI Identifier:
1574201
Report Number(s):
NREL/JA-5900-75392
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 14
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; fuel cells; PEM; atomically dispersed; ORR catalyst activity; polymer electrolyte fuel cell

Citation Formats

Ahluwalia, R. K., Wang, X., Osmieri, Luigi, Peng, J.-K., Chung, H. T., and Neyerlin, Kenneth C. Performance of Polymer Electrolyte Fuel Cell Electrodes with Atomically Dispersed (AD) Fe-C-N ORR Catalyst. United States: N. p., 2019. Web. doi:https://dx.doi.org/10.1149/2.0851914jes.
Ahluwalia, R. K., Wang, X., Osmieri, Luigi, Peng, J.-K., Chung, H. T., & Neyerlin, Kenneth C. Performance of Polymer Electrolyte Fuel Cell Electrodes with Atomically Dispersed (AD) Fe-C-N ORR Catalyst. United States. doi:https://dx.doi.org/10.1149/2.0851914jes.
Ahluwalia, R. K., Wang, X., Osmieri, Luigi, Peng, J.-K., Chung, H. T., and Neyerlin, Kenneth C. Fri . "Performance of Polymer Electrolyte Fuel Cell Electrodes with Atomically Dispersed (AD) Fe-C-N ORR Catalyst". United States. doi:https://dx.doi.org/10.1149/2.0851914jes.
@article{osti_1574201,
title = {Performance of Polymer Electrolyte Fuel Cell Electrodes with Atomically Dispersed (AD) Fe-C-N ORR Catalyst},
author = {Ahluwalia, R. K. and Wang, X. and Osmieri, Luigi and Peng, J.-K. and Chung, H. T. and Neyerlin, Kenneth C},
abstractNote = {Activity of (AD)Fe-N-C catalyst with low Fe content is investigated in differential cells prepared by hot pressing anode gas diffusion electrodes (0.2 mgPt/cm2) to N211 membrane and brush painting the cathode catalyst ink. Polarization curves obtained in H2/O2 show double Tafel slopes which, in conjunction with the redox potential observed in cyclic voltammetry traces, forms the basis for a distributed ORR (oxygen reduction reaction) kinetic model with potential-dependent available sites. Application of this model to polarization data in H2/air provides the basis for formulating an oxygen transport model and leads to 7.7 +/- mA0.6 mA/cm2 catalyst activity at 0.9 V, 31.5-34.3 mA/cm2 cell performance at 0.8 V, and 0.8-2 s/cm O2 transport resistance. A coupled kinetic, O2 transport and proton transport illustrates the projected improvements needed in catalyst activity and electrode structure to approach the automotive target of 1000 mW/cm2 stack power density while meeting the 1.45 kW/degrees C heat rejection constraint at 1.5 cathode stoichiometry. The model indicates that we need twelve-fold higher mass activity for reducing the kinetic losses, doubling of active site density and an engineered electrode structure for 50% lower proton transport resistance, as well as a 50% reduction in electrode thickness to limit the O2 transport losses.},
doi = {https://dx.doi.org/10.1149/2.0851914jes},
journal = {Journal of the Electrochemical Society},
number = 14,
volume = 166,
place = {United States},
year = {2019},
month = {10}
}

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