TY - JOUR
T1 - Direct evidence of the mechanism for the electro-oxidation of urea on Ni(OH)2 catalyst in alkaline medium
AU - Vedharathinam, Vedasri
AU - Botte, Gerardine G.
N1 - Funding Information:
The authors would like to thank the financial support of the Center for Electrochemical Engineering Research at Ohio University , and the Department of Defense through the U.S. Army Construction Engineering Research Laboratory (W9132T-09-1-0001). The content of the information does not reflect the position or the policy of the U.S. government. The authors also thank Dr. Madhivanan Muthuvel for his helpful discussion during the project.
PY - 2013
Y1 - 2013
N2 - The electrochemical oxidation mechanism of urea on a Ni(OH)2 catalyst in alkaline medium was investi-gated using in situ surface enhanced Raman spectroscopy. It was demonstrated that the urea oxidationfollows a catalyst regeneration mechanism. In the proposed mechanism, Ni(OH)2 is electrochemicallyoxidized to NiOOH that mediates the urea oxidation reaction. During the urea oxidation process, thecatalytically active NiOOH is chemically reduced to the inactive Ni(OH)2 by urea, concurrently, urea ischemically oxidized to its products. The inactive Ni(OH)2 is electrochemically oxidized to NiOOH dueto the prevailing high oxidation potential thus regenerating the catalyst for further oxidation of ureamolecules.
AB - The electrochemical oxidation mechanism of urea on a Ni(OH)2 catalyst in alkaline medium was investi-gated using in situ surface enhanced Raman spectroscopy. It was demonstrated that the urea oxidationfollows a catalyst regeneration mechanism. In the proposed mechanism, Ni(OH)2 is electrochemicallyoxidized to NiOOH that mediates the urea oxidation reaction. During the urea oxidation process, thecatalytically active NiOOH is chemically reduced to the inactive Ni(OH)2 by urea, concurrently, urea ischemically oxidized to its products. The inactive Ni(OH)2 is electrochemically oxidized to NiOOH dueto the prevailing high oxidation potential thus regenerating the catalyst for further oxidation of ureamolecules.
KW - Catalyst regeneration mechanism
KW - Hydrogen production
KW - In situ surface enhanced Ramanspectroscopy
KW - Nickel oxyhydroxide
KW - Urea electro-oxidation
UR - http://www.scopus.com/inward/record.url?scp=84884585188&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2013.06.137
DO - 10.1016/j.electacta.2013.06.137
M3 - Article
AN - SCOPUS:84884585188
SN - 0013-4686
VL - 108
SP - 660
EP - 665
JO - Electrochimica Acta
JF - Electrochimica Acta
ER -