First-Principles Study on CO Removing Mechanism on Pt-Decorated Oxygen-Rich Anode Surfaces (Pt2/o-MO2(110), M = Ru and Ir) in DMFC

Chi You Liu, Chun Chih Chang, Jia-Jen Ho, Elise Yu-Tzu Li

研究成果: 雜誌貢獻文章

1 引文 (Scopus)

摘要

Direct methanol fuel cell (DMFC) is an efficient power source. However, the DMFC anodes are easily toxified by CO or other hydrocarbons, which terminates the methanol oxidation reaction (MOR). The most commonly used high performance catalyst on DMFC anodes is Pt or bimetallic PtRu. In this work, we apply density functional theory (DFT) to investigate the adsorption of CO and H2O on pristine Pt2/MO2(110) and the oxygen-rich Pt2/o-MO2(110) surfaces (M = Ru and Ir). We find that the application of the oxygen-rich surfaces significantly reduces the adsorption energies of CO and H2O molecules as well as the major reaction barrier (CO + OH → CO2) in the water-gas-shift-like (WGS-like) reactions forming CO2. Our detailed analyses on the electronic interaction between the catalysts and adsorbates indicate that Pt2/o-MO2(110) may be a promising DMFC anode material, which reduces the poison problem, and that it may be the actual experimental system that is responsible for the observed efficient CO removal.

原文英語
頁(從 - 到)9825-9832
頁數8
期刊Journal of Physical Chemistry C
121
發行號18
DOIs
出版狀態已發佈 - 2017 五月 11

指紋

Direct methanol fuel cells (DMFC)
Carbon Monoxide
fuel cells
Anodes
anodes
cell anodes
methyl alcohol
Oxygen
oxygen
Adsorption
Catalysts
Water gas shift
Adsorbates
catalysts
poisons
adsorption
Poisons
Density functional theory
Hydrocarbons
Methanol

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

引用此文

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abstract = "Direct methanol fuel cell (DMFC) is an efficient power source. However, the DMFC anodes are easily toxified by CO or other hydrocarbons, which terminates the methanol oxidation reaction (MOR). The most commonly used high performance catalyst on DMFC anodes is Pt or bimetallic PtRu. In this work, we apply density functional theory (DFT) to investigate the adsorption of CO and H2O on pristine Pt2/MO2(110) and the oxygen-rich Pt2/o-MO2(110) surfaces (M = Ru and Ir). We find that the application of the oxygen-rich surfaces significantly reduces the adsorption energies of CO and H2O molecules as well as the major reaction barrier (CO + OH → CO2) in the water-gas-shift-like (WGS-like) reactions forming CO2. Our detailed analyses on the electronic interaction between the catalysts and adsorbates indicate that Pt2/o-MO2(110) may be a promising DMFC anode material, which reduces the poison problem, and that it may be the actual experimental system that is responsible for the observed efficient CO removal.",
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AU - Liu, Chi You

AU - Chang, Chun Chih

AU - Ho, Jia-Jen

AU - Li, Elise Yu-Tzu

PY - 2017/5/11

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N2 - Direct methanol fuel cell (DMFC) is an efficient power source. However, the DMFC anodes are easily toxified by CO or other hydrocarbons, which terminates the methanol oxidation reaction (MOR). The most commonly used high performance catalyst on DMFC anodes is Pt or bimetallic PtRu. In this work, we apply density functional theory (DFT) to investigate the adsorption of CO and H2O on pristine Pt2/MO2(110) and the oxygen-rich Pt2/o-MO2(110) surfaces (M = Ru and Ir). We find that the application of the oxygen-rich surfaces significantly reduces the adsorption energies of CO and H2O molecules as well as the major reaction barrier (CO + OH → CO2) in the water-gas-shift-like (WGS-like) reactions forming CO2. Our detailed analyses on the electronic interaction between the catalysts and adsorbates indicate that Pt2/o-MO2(110) may be a promising DMFC anode material, which reduces the poison problem, and that it may be the actual experimental system that is responsible for the observed efficient CO removal.

AB - Direct methanol fuel cell (DMFC) is an efficient power source. However, the DMFC anodes are easily toxified by CO or other hydrocarbons, which terminates the methanol oxidation reaction (MOR). The most commonly used high performance catalyst on DMFC anodes is Pt or bimetallic PtRu. In this work, we apply density functional theory (DFT) to investigate the adsorption of CO and H2O on pristine Pt2/MO2(110) and the oxygen-rich Pt2/o-MO2(110) surfaces (M = Ru and Ir). We find that the application of the oxygen-rich surfaces significantly reduces the adsorption energies of CO and H2O molecules as well as the major reaction barrier (CO + OH → CO2) in the water-gas-shift-like (WGS-like) reactions forming CO2. Our detailed analyses on the electronic interaction between the catalysts and adsorbates indicate that Pt2/o-MO2(110) may be a promising DMFC anode material, which reduces the poison problem, and that it may be the actual experimental system that is responsible for the observed efficient CO removal.

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