Unexpected Downstream Mode of Spatiotemporal Rotating Waves Found in the Model of H₂O₂ Reduction on a Platinum Ring-Shaped Electrode under Mild Convection

Abstract

We investigated the effect of convection on the formation of a spatiotemporal pattern observed in the reduction of hydrogen peroxide on a platinum ring-shaped electrode via numerical simulations with an emphasis on the direction of the rotating waves, which causes the spatiotemporal pattern formed in the system. We examined the ratio of right-handed and left-handed rotating waves formed under different conditions by conducting several simulations with random perturbations. For all conditions under strong convection, the rotating waves were opposite to the convection direction. In contrast, rotating waves under mild convection were preferentially in the same direction as convection when the system had a strong spatial coupling. These results imply that the mode of the rotation waves is determined by nonlinear dynamics, and a discussion on the mechanism of mode determination should help control the chirality of the spatiotemporal pattern.

Preface for the 66th Special Feature “Novel Aspects and Approaches to Experimental Methods for Electrochemistry”

“…His research interests include surface processing based on self-organization in electrochemical reactions, fundamental understanding of electrochemical reactivity based on lattice defects, and the production of multicomponent alloys such as medium-and high-entropy alloys by electrodeposition. [83][84][85][86][87][88][89][90][91] He has published more than 110 peerreviewed scientific papers. Currently, he is an active member of CNRS France-Japan Laboratoire International Associé on "Chiral Nanostructures for Photonic applications."…”

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

“…Many systems that exhibit spontaneous spatiotemporal pattern formation during electrochemical reactions have been reported. − Of these, electrodeposition is interesting for the following reasons. First, records of spatiotemporal patterns are encoded as characteristic morphologies of deposits.…”