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Title: Synthesis and Characterization of CO- and H2S- Tolerant Electrocatalysts for PEM Fuel Cell

Abstract

The present state-of-art Proton Exchange Membrane Fuel Cell (PEMFC) technology is based on platinum (Pt) as a catalyst for both the fuel (anode) and air (cathode) electrodes. This catalyst is highly active but susceptible to poisoning by CO, which may be present in the H{sub 2}-fuel used or may be introduced during the fuel processing. Presence of trace amount of CO in the H{sub 2}-fuel poisons the anode irreversibly and decreases the performance of the PEMFCs. In an effort to reduce the Pt-loading and improve the PEMFC performance, we have synthesized a number of Pt-based binary, ternary, and quaternary electrocatalysts using Ru, Mo, Ir, Ni, and Co as a substitute for Pt. Co-catalytic activities were found for the elements Mo, Ru, and Ir. Both the ternary (Pt/Ru/Mo/C) and quaternary (Pt/Ru/Mo/Ir/C) metal catalysts in membrane electrode assemblies (MEA) outperformed pure Pt/C catalysts at all levels in presence of CO up to 100 ppm. Preliminary results suggest that by substituting Mo, Ru, and Ir in catalyst formulation, it is possible to reduce Pt-loading and increase CO-tolerance in PEMFC application. Comparison studies showed that the newly developed ternary and quaternary catalysts with lower Pt outperformed pure Pt catalyst in presence of CO-contaminated H{submore » 2} fuel. High performance at low Pt loading of less than 0.4 mg/cm{sup 2} was achieved, thus exceeding the initial targets.« less

Authors:
Publication Date:
Research Org.:
North Carolina A & T State U
Sponsoring Org.:
USDOE
OSTI Identifier:
920998
DOE Contract Number:  
FG26-02NT41673
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ANODES; CATALYSTS; ELECTROCATALYSTS; ELECTRODES; FUEL CELLS; MEMBRANES; PERFORMANCE; PLATINUM; POISONING; PROCESSING; PROTON EXCHANGE MEMBRANE FUEL CELLS; SYNTHESIS; TARGETS; TRACE AMOUNTS

Citation Formats

Shamsuddin Ilias. Synthesis and Characterization of CO- and H2S- Tolerant Electrocatalysts for PEM Fuel Cell. United States: N. p., 2006. Web. doi:10.2172/920998.
Shamsuddin Ilias. Synthesis and Characterization of CO- and H2S- Tolerant Electrocatalysts for PEM Fuel Cell. United States. doi:10.2172/920998.
Shamsuddin Ilias. Sun . "Synthesis and Characterization of CO- and H2S- Tolerant Electrocatalysts for PEM Fuel Cell". United States. doi:10.2172/920998. https://www.osti.gov/servlets/purl/920998.
@article{osti_920998,
title = {Synthesis and Characterization of CO- and H2S- Tolerant Electrocatalysts for PEM Fuel Cell},
author = {Shamsuddin Ilias},
abstractNote = {The present state-of-art Proton Exchange Membrane Fuel Cell (PEMFC) technology is based on platinum (Pt) as a catalyst for both the fuel (anode) and air (cathode) electrodes. This catalyst is highly active but susceptible to poisoning by CO, which may be present in the H{sub 2}-fuel used or may be introduced during the fuel processing. Presence of trace amount of CO in the H{sub 2}-fuel poisons the anode irreversibly and decreases the performance of the PEMFCs. In an effort to reduce the Pt-loading and improve the PEMFC performance, we have synthesized a number of Pt-based binary, ternary, and quaternary electrocatalysts using Ru, Mo, Ir, Ni, and Co as a substitute for Pt. Co-catalytic activities were found for the elements Mo, Ru, and Ir. Both the ternary (Pt/Ru/Mo/C) and quaternary (Pt/Ru/Mo/Ir/C) metal catalysts in membrane electrode assemblies (MEA) outperformed pure Pt/C catalysts at all levels in presence of CO up to 100 ppm. Preliminary results suggest that by substituting Mo, Ru, and Ir in catalyst formulation, it is possible to reduce Pt-loading and increase CO-tolerance in PEMFC application. Comparison studies showed that the newly developed ternary and quaternary catalysts with lower Pt outperformed pure Pt catalyst in presence of CO-contaminated H{sub 2} fuel. High performance at low Pt loading of less than 0.4 mg/cm{sup 2} was achieved, thus exceeding the initial targets.},
doi = {10.2172/920998},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 2006},
month = {Sun Dec 31 00:00:00 EST 2006}
}

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