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Title: PGM-Free ORR Catalysts Designed by Templating PANI-Type Polymers Containing Functional Groups with High Affinity to Iron

Abstract

In this work, a coordination-chemistry approach was used to increase the content of nitrogen-coordinated iron moieties (Fe-Nx) in platinum group metal-free (PGM-free) catalysts for oxygen reduction reaction (ORR). The catalysts were derived from a series of polyaniline (PANI)-type precursors with N-containing functional side chains having high affinity to iron. The PGM-free ORR catalysts synthesized using such polymeric templates were characterized by scanning electron microscopy, X-ray diffractometry, and tested in an electrochemical cell and H2-air fuel cell for ORR activity. X-ray photoelectron spectroscopy (XPS) analysis showed that, in spite of similar nitrogen contents, catalysts obtained using PANI-type polymers containing side chains with high affinity to iron had higher Fe content than PANI-derived catalyst. These PGM-free catalysts showed improved ORR activity in an electrochemical cell and in H2-air fuel cell testing, compared to the PANI-derived catalyst. A correlation between the content of Fe-Nx moieties and the fuel cell performance was observed in these PGM-free ORR catalysts.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
OSTI Identifier:
1512751
Report Number(s):
LA-UR-19-23788
Journal ID: ISSN 0013-4651
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 7; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; PGM-free Catalyst; PGM-free ORR Catalyst; Oxygen Reduction Reaction; ORR; Platinum-group metal free catalyst; non-platinum catalyst; nonPGM catalyst; N-doped carbon; Nitrogen-doped carbon; Polyaniline; Electrocatalysis; iron

Citation Formats

Yin, Xi, Chung, Hoon Taek, Martinez, Ulises, Lin, Ling, Artyushkova, Kateryna, and Zelenay, Piotr. PGM-Free ORR Catalysts Designed by Templating PANI-Type Polymers Containing Functional Groups with High Affinity to Iron. United States: N. p., 2019. Web. doi:10.1149/2.0301907jes.
Yin, Xi, Chung, Hoon Taek, Martinez, Ulises, Lin, Ling, Artyushkova, Kateryna, & Zelenay, Piotr. PGM-Free ORR Catalysts Designed by Templating PANI-Type Polymers Containing Functional Groups with High Affinity to Iron. United States. doi:10.1149/2.0301907jes.
Yin, Xi, Chung, Hoon Taek, Martinez, Ulises, Lin, Ling, Artyushkova, Kateryna, and Zelenay, Piotr. Fri . "PGM-Free ORR Catalysts Designed by Templating PANI-Type Polymers Containing Functional Groups with High Affinity to Iron". United States. doi:10.1149/2.0301907jes. https://www.osti.gov/servlets/purl/1512751.
@article{osti_1512751,
title = {PGM-Free ORR Catalysts Designed by Templating PANI-Type Polymers Containing Functional Groups with High Affinity to Iron},
author = {Yin, Xi and Chung, Hoon Taek and Martinez, Ulises and Lin, Ling and Artyushkova, Kateryna and Zelenay, Piotr},
abstractNote = {In this work, a coordination-chemistry approach was used to increase the content of nitrogen-coordinated iron moieties (Fe-Nx) in platinum group metal-free (PGM-free) catalysts for oxygen reduction reaction (ORR). The catalysts were derived from a series of polyaniline (PANI)-type precursors with N-containing functional side chains having high affinity to iron. The PGM-free ORR catalysts synthesized using such polymeric templates were characterized by scanning electron microscopy, X-ray diffractometry, and tested in an electrochemical cell and H2-air fuel cell for ORR activity. X-ray photoelectron spectroscopy (XPS) analysis showed that, in spite of similar nitrogen contents, catalysts obtained using PANI-type polymers containing side chains with high affinity to iron had higher Fe content than PANI-derived catalyst. These PGM-free catalysts showed improved ORR activity in an electrochemical cell and in H2-air fuel cell testing, compared to the PANI-derived catalyst. A correlation between the content of Fe-Nx moieties and the fuel cell performance was observed in these PGM-free ORR catalysts.},
doi = {10.1149/2.0301907jes},
journal = {Journal of the Electrochemical Society},
number = 7,
volume = 166,
place = {United States},
year = {2019},
month = {5}
}

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Figures / Tables:

Figure 1 Figure 1: Polymerization reactions of aniline-type precursors containing chains with high affinity to Fe. Functional groups responsible for high Fe-affinity are in red circles.

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