A procedure for the constant potential electrodeposition of rhodium onto nickel electrodes, the subsequent surface characterizations, and electrochemical evaluation is presented. The resulting Ni/Rh electrodes were evaluated for their activity as anode catalysts for the electro-oxidation of urea. A detailed procedure for the electrodeposition of Rh onto Ni foil is provided. It is shown that the electrocatalytic performance of Ni/Rh electrodes on the oxidation of urea in alkaline medium is primarily influenced by two electrodeposition parameters: the applied electrodeposition potential and the loading of Rh (mg cm−2). An optimization for electrocatalytic performance based on the electrodeposition potential and Rh loading is demonstrated. The effect of these parameters on visual finish, surface morphology, and crystal structure was also studied.
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The authors are thankful for the financial support from 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 work does not reflect the position or the policy of the U.S. government.
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Miller, A.T., Hassler, B.L. & Botte, G.G. Rhodium electrodeposition on nickel electrodes used for urea electrolysis. J Appl Electrochem 42, 925–934 (2012). https://doi.org/10.1007/s10800-012-0478-1