Home > Papers

 
 
Electrochemical characteristics of patterned nickel electrodes on single-crystal YSZ in CO/CO2 atmospheres for operating in fuel cell/electrolysis cell modes
LI Wenying,SHI Yixiang *,LUO Yu #,WANG Yuqing,CAI Ningsheng
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University
*Correspondence author
#Submitted by
Subject:
Funding: Doctoral Fund of Ministry of Education of China（No.20110002120017）, National Basic Research Program of China(973 Program)（No.2014CB249201）, Beijing Higher Education Young Elite Teacher Project（No.YETP0090）, Natural Science Foundation of China（No.51276098）
Opened online:26 November 2015
Accepted by: none
Citation: LI Wenying,SHI Yixiang,LUO Yu.Electrochemical characteristics of patterned nickel electrodes on single-crystal YSZ in CO/CO2 atmospheres for operating in fuel cell/electrolysis cell modes[OL]. [26 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4662920
 
 
Patterned Ni electrodes on single-crystal YSZ are used as the fuel electrode for solid oxide cells (SOC) to study the electrochemical performance in CO/CO2 atmospheres in this paper. Patterned Ni maintains stable and intact during the whole test at high temperature. The polarization curves and EIS are measured with different operating voltages, temperatures, partial pressure of CO and CO2. The experimental results indicate that the patterned Ni electrode in SOEC mode performed a positive correlation with temperature, partial pressure of CO and CO2. The influence of partial pressure of CO2 is very weak, mainly due to the limited adsorption sites of CO2 on patterned Ni electrode. Besides, the rate of electrochemical reduction of CO2 is obviously slower than that of electrochemical oxidation of CO at the same temperature and gas component. Surface diffusion has a much greater effect on SOEC than on SOFC, especially when polarization voltage is small. Finally, a simplified reaction mechanism of CO2 electrolysis is proposed. The rate determining step of CO2 reduction on patterned Ni electrode could be the charge transfer reaction O(Ni)+(YSZ)+2e-→O2-(YSZ)+(Ni). When the polarization voltage is small, the surface diffusion of O(Ni) also could become rate co-determining.
Keywords:Electrochemistry; solid oxide cell; nickel patterned electrode; carbon dioxide; charge transfer reaction; surface diffusion; rate determining step
 
 
 

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 49
Bookmarked 0
Recommend 0
Comments Array
Submit your papers