ABSTRACT
Recent developments in electrochemistry of Rh(lll), Rh(100), and Rh(llO) electrodes are reviewed, where the characteristics of the cyclic voltammogram of these surfaces in acidic solutions are discussed in relation to the adsorption of anions depending on the electrode potentials. Characteristic cyclic voltammogram is a good monitor of Rh on the bimetallic surfaces, which is a highly sensitive tool to detect the compositional change of bimetallic surfaces. The role of Rh for the prominent catalytic activity of Pt-Rh bimetallic catalyst for the reaction of NO + H2 is discussed by diagnosing the bimetallic catalyst surfaces before and after the catalysis.
