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The lower energy of CO adsorption observed with the Pt/single wall carbon nanotubes electrode demonstrates the CO-tolerance electrocatalyst and gives credence for the use of SWCNT in direct methanol fuel cells

Single-wall carbon nanotubes supported platinum nanoparticles with improved electrocatalytic activity for oxygen reduction reaction.

Langmuir : the ACS journal of surfaces and colloids, no. 5 (2006): 2392-2396

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摘要

Significant enhancement in the electrocatalytic activity of Pt particles toward oxygen reduction reaction (ORR) has been achieved by depositing them on a single wall carbon nanotubes (SWCNT) support. Compared to a commercial Pt/carbon black catalyst, Pt/SWCNT films cast on a rotating disk electrode exhibit a lower onset potential and a hi...更多

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简介
  • The performance of a cathode is a major limiting factor in optimizing the power output of hydrogen and direct methanol based fuel cells. The electrocatalyst dispersed on a carbon support is tailored to induce four-electron reduction of oxygen to water by utilizing the protons that permeate from the anode compartment.
  • The electrocatalyst dispersed on a carbon support is tailored to induce four-electron reduction of oxygen to water by utilizing the protons that permeate from the anode compartment.
  • A low reduction oxygen rate at the cathode is one of the major challenges to overcome..
  • Recent research focus has been diverted toward the development of electrocatalysts that make use of bimetallic alloys..
  • Of particular interest is the Pt-Co alloys that have shown an enhanced rate constant for O2 reduction.
  • A low reduction oxygen rate at the cathode is one of the major challenges to overcome. Recent research focus has been diverted toward the development of electrocatalysts that make use of bimetallic alloys. Of particular interest is the Pt-Co alloys that have shown an enhanced rate constant for O2 reduction.
重点内容
  • The performance of a cathode is a major limiting factor in optimizing the power output of hydrogen and direct methanol based fuel cells.1,2 The electrocatalyst dispersed on a carbon support is tailored to induce four-electron reduction of oxygen to water by utilizing the protons that permeate from the anode compartment
  • Compared to a commercial Pt/carbon black catalyst, Pt/single wall carbon nanotubes (SWCNT) films cast on a rotating disk electrode exhibit a lower onset potential and a higher electron-transfer rate constant for oxygen reduction
  • These results further provide credence for our argument that the SWCNT support plays an important role in enhancing the catalytic activity toward oxygen reduction
  • Pt deposited on SWCNT exhibited a 2-fold higher rate constant, kapp, than Pt/C
  • The high porosity of SWCNT facilitates diffusion of the reactant and facilitates interaction with the Pt surface. It is evident from the accelerated durability tests that SWCNT enhance the stability of the electrocatalyst
  • The lower energy of CO adsorption observed with the Pt/SWCNT electrode demonstrates the CO-tolerance electrocatalyst and gives credence for the use of SWCNT in direct methanol fuel cells
结果
  • A good dispersion of the Pt catalyst on the carbon support is a precondition (20) Paulus, U.
结论
  • Oxygen reduction at Pt/SWCNT films has been evaluated using a thin film rotating disk electrode at elevated temperature.
  • Activation enthalpies for O2 reduction at Pt/ SWCNT and Pt/C exhibited similar values, confirming the rate-determining step involved in the oxygen reduction were same.
  • The high porosity of SWCNT facilitates diffusion of the reactant and facilitates interaction with the Pt surface.
  • It is evident from the accelerated durability tests that SWCNT enhance the stability of the electrocatalyst.
  • The lower energy of CO adsorption observed with the Pt/SWCNT electrode demonstrates the CO-tolerance electrocatalyst and gives credence for the use of SWCNT in direct methanol fuel cells
总结
  • Introduction:

    The performance of a cathode is a major limiting factor in optimizing the power output of hydrogen and direct methanol based fuel cells. The electrocatalyst dispersed on a carbon support is tailored to induce four-electron reduction of oxygen to water by utilizing the protons that permeate from the anode compartment.
  • The electrocatalyst dispersed on a carbon support is tailored to induce four-electron reduction of oxygen to water by utilizing the protons that permeate from the anode compartment.
  • A low reduction oxygen rate at the cathode is one of the major challenges to overcome..
  • Recent research focus has been diverted toward the development of electrocatalysts that make use of bimetallic alloys..
  • Of particular interest is the Pt-Co alloys that have shown an enhanced rate constant for O2 reduction.
  • A low reduction oxygen rate at the cathode is one of the major challenges to overcome. Recent research focus has been diverted toward the development of electrocatalysts that make use of bimetallic alloys. Of particular interest is the Pt-Co alloys that have shown an enhanced rate constant for O2 reduction.
  • Results:

    A good dispersion of the Pt catalyst on the carbon support is a precondition (20) Paulus, U.
  • Conclusion:

    Oxygen reduction at Pt/SWCNT films has been evaluated using a thin film rotating disk electrode at elevated temperature.
  • Activation enthalpies for O2 reduction at Pt/ SWCNT and Pt/C exhibited similar values, confirming the rate-determining step involved in the oxygen reduction were same.
  • The high porosity of SWCNT facilitates diffusion of the reactant and facilitates interaction with the Pt surface.
  • It is evident from the accelerated durability tests that SWCNT enhance the stability of the electrocatalyst.
  • The lower energy of CO adsorption observed with the Pt/SWCNT electrode demonstrates the CO-tolerance electrocatalyst and gives credence for the use of SWCNT in direct methanol fuel cells
表格
  • Table1: Electrocatalytic Properties of Pt/SWCNT and Pt/C Electrodes
Download tables as Excel
基金
  • The research described herein was supported by the Indiana 21st Century Research and Technology Fund and the U.S Army CECOM RDEC through Agreement DAAB07-03-3-K414
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