Second Order Dependence on the Surface Fraction of Pt in Pt—Ru_adatom of the Oxidation of 2-PrOH in Base

Abstract

The electrooxidation of 2-PrOH in alkaline electrolyte is studied over a series of Pt-Ru adatom catalysts with controlled surface compositions as a function of potential and temperature. Multivariable analysis is used to determine both kinetic and thermodynamic parameters of interest. PtRu surfaces are found to be more active at low potentials than either Pt or Ru alone. At moderate overpotentials, Pt is the most active catalyst due to a surface blocking effect by Ru. A clear second order dependence on the surface fraction of Pt is determined, and a kinetic isotope effect suggest that both CH­(D) and OH­(D) bonds are broken before or during the rate-determining step for the electro-dehydrogenation of 2-propanol to acetone. Possible mechanisms that account for these observations are discussed.

Review and Perspective of Nickel and Its Derived Catalysts for Different Electrochemical Synthesis Reactions in Alkaline Media for Hydrogen Production

“…149 The isopropanol oxidation reaction (IOR) does not produce CO as reaction intermediates. 150,151 This can help in development of cheap transition metal-based catalysts. 152 Isopropanol oxidation for electrochemical hydrogen production offers significant advantages and opportunities in the field of sustainable energy.…”

“…The Pt surface can only produce reactive hydroxyl intermediates (OH ad ) and remove CO at high anode potentials in order to recover the active sites . The isopropanol oxidation reaction (IOR) does not produce CO as reaction intermediates. , This can help in development of cheap transition metal-based catalysts . Isopropanol oxidation for electrochemical hydrogen production offers significant advantages and opportunities in the field of sustainable energy .…”