Reciprocal Sum Expression for Steady-state Current–potential Curve in Electrocatalytic Model: The Relationship between Desorption Process and Reversibility

抄録

Steady-state current–potential curves are often used to evaluate electrocatalysts. Steady-state current is generally expressed as a sum of reciprocals. Previously, we proposed that the catalytic reaction should be considered and that the inverse of the steady-state current can be expressed as the reciprocal sum of the diffusion-controlled and the electrocatalytic-controlled limiting current (i_ec) (Y. Yokoyama, et al., Electrochemistry, 90, 103002 (2022)). In this paper, we report a further modification to the i_ec that reveals it involves the adsorption/desorption steps of reactants/products to/from the catalyst. The relationship between limiting current and the reversibility of the electrode reaction is also discussed.