Reformate gas composition and pressure effect on CO tolerant Pt/Ti0.8Mo0.2O2–C electrocatalyst for PEM fuel cells

M. Suha Yazici; Sümeyye Dursun; Irina Borbáth; András Tompos

doi:10.1016/j.ijhydene.2020.08.226

Reformate gas composition and pressure effect on CO tolerant Pt/Ti_0.8Mo_0.2O₂–C electrocatalyst for PEM fuel cells

M. Suha Yazici^*, Sümeyye Dursun, Irina Borbáth, András Tompos

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Mixed-oxide coated Ti_0.8Mo_0.2O₂–C composite supported 20 wt% Pt electrocatalysts with Ti_0.8Mo_0.2O₂/C=75/25 mass ratio were developed for CO tolerance of polymer electrolyte membrane fuel cell (PEMFC) anode. Studies of the structure, composition and stability, as well as the results of CO_ads stripping confirmed that the mixed oxide composite support and the electrocatalyst prepared for this study show the well-documented characteristics of the Pt/Ti_1-xMo_xO₂-C systems with enhanced CO tolerance compared to the Pt/C catalyst. Dilution of hydrogen with CO₂ and CH₄ had negligible negative impact on the fuel cell performance. Switching gas composition between hydrogen and reformate shows recovery of potential after CO poisoning. Nevertheless, anode catalyst loading of 0.25 and 0.5 mgPt/cm² was not enough to give reasonable performance when CO impurity was present. Loading of 0.85 mgPt/cm² Ti_0.8Mo_0.2O₂–C supported catalyst was effective to give 1000 mA/cm² current density at 0.6 V under 25 ppm CO and 30 psig. Higher loading was needed at mass transfer limited region to overcome poisoning. However, loadings higher than 0.85 mgPt/cm² caused mass transfer limitations. Hence higher loadings is proposed with 40 wt% Pt/Ti_0.8Mo_0.2O₂–C support catalyst.

Original language	English
Pages (from-to)	13524-13533
Number of pages	10
Journal	International Journal of Hydrogen Energy
Volume	46
Issue number	25
DOIs	https://doi.org/10.1016/j.ijhydene.2020.08.226
Publication status	Published - 9 Apr 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020 Hydrogen Energy Publications LLC

Keywords

CO tolerance
Composite materials
Fuel cell
Pt electrocatalyst
Reformate

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2020.08.226

Cite this

@article{4271d36da65e450c9a881f4538ce82e3,

title = "Reformate gas composition and pressure effect on CO tolerant Pt/Ti0.8Mo0.2O2–C electrocatalyst for PEM fuel cells",

abstract = "Mixed-oxide coated Ti0.8Mo0.2O2–C composite supported 20 wt% Pt electrocatalysts with Ti0.8Mo0.2O2/C=75/25 mass ratio were developed for CO tolerance of polymer electrolyte membrane fuel cell (PEMFC) anode. Studies of the structure, composition and stability, as well as the results of COads stripping confirmed that the mixed oxide composite support and the electrocatalyst prepared for this study show the well-documented characteristics of the Pt/Ti1-xMoxO2-C systems with enhanced CO tolerance compared to the Pt/C catalyst. Dilution of hydrogen with CO2 and CH4 had negligible negative impact on the fuel cell performance. Switching gas composition between hydrogen and reformate shows recovery of potential after CO poisoning. Nevertheless, anode catalyst loading of 0.25 and 0.5 mgPt/cm2 was not enough to give reasonable performance when CO impurity was present. Loading of 0.85 mgPt/cm2 Ti0.8Mo0.2O2–C supported catalyst was effective to give 1000 mA/cm2 current density at 0.6 V under 25 ppm CO and 30 psig. Higher loading was needed at mass transfer limited region to overcome poisoning. However, loadings higher than 0.85 mgPt/cm2 caused mass transfer limitations. Hence higher loadings is proposed with 40 wt% Pt/Ti0.8Mo0.2O2–C support catalyst.",

keywords = "CO tolerance, Composite materials, Fuel cell, Pt electrocatalyst, Reformate",

author = "Yazici, {M. Suha} and S{\"u}meyye Dursun and Irina Borb{\'a}th and Andr{\'a}s Tompos",

note = "Publisher Copyright: {\textcopyright} 2020 Hydrogen Energy Publications LLC",

year = "2021",

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doi = "10.1016/j.ijhydene.2020.08.226",

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T1 - Reformate gas composition and pressure effect on CO tolerant Pt/Ti0.8Mo0.2O2–C electrocatalyst for PEM fuel cells

AU - Yazici, M. Suha

AU - Dursun, Sümeyye

AU - Borbáth, Irina

AU - Tompos, András

PY - 2021/4/9

Y1 - 2021/4/9

N2 - Mixed-oxide coated Ti0.8Mo0.2O2–C composite supported 20 wt% Pt electrocatalysts with Ti0.8Mo0.2O2/C=75/25 mass ratio were developed for CO tolerance of polymer electrolyte membrane fuel cell (PEMFC) anode. Studies of the structure, composition and stability, as well as the results of COads stripping confirmed that the mixed oxide composite support and the electrocatalyst prepared for this study show the well-documented characteristics of the Pt/Ti1-xMoxO2-C systems with enhanced CO tolerance compared to the Pt/C catalyst. Dilution of hydrogen with CO2 and CH4 had negligible negative impact on the fuel cell performance. Switching gas composition between hydrogen and reformate shows recovery of potential after CO poisoning. Nevertheless, anode catalyst loading of 0.25 and 0.5 mgPt/cm2 was not enough to give reasonable performance when CO impurity was present. Loading of 0.85 mgPt/cm2 Ti0.8Mo0.2O2–C supported catalyst was effective to give 1000 mA/cm2 current density at 0.6 V under 25 ppm CO and 30 psig. Higher loading was needed at mass transfer limited region to overcome poisoning. However, loadings higher than 0.85 mgPt/cm2 caused mass transfer limitations. Hence higher loadings is proposed with 40 wt% Pt/Ti0.8Mo0.2O2–C support catalyst.

AB - Mixed-oxide coated Ti0.8Mo0.2O2–C composite supported 20 wt% Pt electrocatalysts with Ti0.8Mo0.2O2/C=75/25 mass ratio were developed for CO tolerance of polymer electrolyte membrane fuel cell (PEMFC) anode. Studies of the structure, composition and stability, as well as the results of COads stripping confirmed that the mixed oxide composite support and the electrocatalyst prepared for this study show the well-documented characteristics of the Pt/Ti1-xMoxO2-C systems with enhanced CO tolerance compared to the Pt/C catalyst. Dilution of hydrogen with CO2 and CH4 had negligible negative impact on the fuel cell performance. Switching gas composition between hydrogen and reformate shows recovery of potential after CO poisoning. Nevertheless, anode catalyst loading of 0.25 and 0.5 mgPt/cm2 was not enough to give reasonable performance when CO impurity was present. Loading of 0.85 mgPt/cm2 Ti0.8Mo0.2O2–C supported catalyst was effective to give 1000 mA/cm2 current density at 0.6 V under 25 ppm CO and 30 psig. Higher loading was needed at mass transfer limited region to overcome poisoning. However, loadings higher than 0.85 mgPt/cm2 caused mass transfer limitations. Hence higher loadings is proposed with 40 wt% Pt/Ti0.8Mo0.2O2–C support catalyst.

KW - CO tolerance

KW - Composite materials

KW - Fuel cell

KW - Pt electrocatalyst

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