Home > Papers

 
 
On the reactivity of Pt/H2O interface in the catalyst layer of PEMFCs
Jun He,Shengli Chen * #,Yuwen Liu,He Rui
Department of Chemistry, Wuhan University
*Correspondence author
#Submitted by
Subject:
Funding: 教育部博士点基金,国家自然科学基金,新世纪优秀人才资助计划（No.20050486025,50632050,NECT-06-0612）
Opened online: 9 January 2009
Accepted by: none
Citation: Jun He,Shengli Chen,Yuwen Liu.On the reactivity of Pt/H2O interface in the catalyst layer of PEMFCs[OL]. [ 9 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27565
 
 
The reactivity of Pt not in direct contact with solid electrolyte in the catalyst layer of PEMFCs is evaluated by investigating the distributions of proton concentration and electric potential in the interfacial region between Nafion membrane and water using Poisson-Boltzmann theory. It is shown that a depletion of proton concentration ( ) occurs within a thickness of about 0.2nm on the Nafion side of the interface. Away from the interface in water phase, the value of is about 0.02M at distance of 1nm and proton concentrations of ~0.001M are still seen at distances within 10 nm to the Nafion/H2O interface. This means that the water adjacent to the Nafion in the catalyst layers of PEMFCs may be significantly acidified to serve as acidic electrolyte. The catalyst surface that is separated from Nafion component in nanometer scales in the catalyst layer is thus likely to be accessible to fuel cell reactions by forming electrochemical interface with the acidified water.
Keywords:PEMFCs;Pt utilization;Nafion/water interface;Poisson-Boltzmann theory
 
 
 

For this paper
  • ● PDF (0B)
  • ● Revision 0 　　
  • ● Print this paper
  • ● Recommend this paper to a friend
  • ● Add to my favorite list

    Saved Papers

    Please enter a name for this paper to be shown in your personalized Saved Papers list

Tags
Add yours

Related Papers

Statistics
PDF Downloaded 290
Bookmarked 0
Recommend 5
Comments Array
Submit your papers