TITLE

Selective Decomposition of NO in the Presence of Excess O2 in Electrochemical Cells

AUTHOR(S)
X. Wang; Q. Zhao; T. Cat
PUB. DATE
September 2004
SOURCE
Journal of Applied Electrochemistry;Sep2004, Vol. 34 Issue 9, p945
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
NO decomposition in solid electrolyte cells was investigated in the presence of excess O2. The results show that NO is decomposed via an electrocatalytic mechanism rather than electrolysis in the range of 1–4 V of applied voltage. The NO is catalytically decomposed to N2 on the cathode surface and O2- produced in situ is transferred through the yttria-stabilized zirconia (YSZ) to the anode by direct current (d.c.) and then is evolved in the form of O2, which helps to maintain the active state of the cathode. In a Pd/YSZ/Pd cell, the palladium metal surface is the active site for NO decomposition, while in the RuO2/Pd/YSZ/Pd cell, the partially reduced RuOx (0 < x < 2) is the main active site for NO decomposition. At 600 °C, the rate-determining step for the overall transportation of O2- from cathode to anode in the RuO2/Pd/YSZ/Pd cell is the transportation of O2- at the cathode Pd/YSZ interface. The transportation rate of O2- at the cathode M/YSZ interface decreases in the order of Ag > Au > Pd > Pt. Substitution of the Pd cathode by Ag leads to an increase in current density by a factor of 3.5. A higher NO decomposition parameter (α=13.4) is also achieved at a lower temperature of 500 °C.
ACCESSION #
14360890

 

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