硫化物在铂电极上电氧化时空动力学的模型模拟和分析

doi:10.3866/PKU.WHXB201402142

Abstract

Abstract:

Based on the reaction mechanism of the electro-oxidation of sulfide on platinum, we propose a simplified model for studying the spatiotemporal dynamics on the electrode surface in the oscillatory region of the N-shaped negative differential resistance (N-NDR) through numerical simulation. Simple and complex current oscillations were observed during the homogeneous simulation, and these were caused by coupling between one positive feedback, i.e., double-layer potential autocatalysis, and two negative feedbacks consisting of a mass-transport limited step and a poison-adsorption process. To obtain a better simulation of the experimental situation, the transport of electroactive species in both the parallel and vertical directions of the electrode was taken into account to simulate pattern formation on the electrode. The model simulations gave complicated patterns including twinkling-eye patterns and traveling waves, which agree qualitatively with the experimental results and possess the same evolution principles. Meanwhile, for certain parameters more complex patterns were obtained, e.g., two-arm spiral waves of the double-layer potential. This opens an interesting perspective in the explanation and prediction of pattern formation in electrochemical systems.

Key words: N-shaped negative differential resistance, Oscillation and complex oscillation, Pattern formation, Electrochemical oxidation of sulfide, Model simulation

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YANG Jia-Ping, YU Hui-Yao, HE Yu-Xiu, XIE Jing-Xuan, BI Wen-Yan, GAO Qing-Yu. Model Simulation and Analysis of Spatiotemporal Dynamics for the Electro-Oxidation of Sulfide on Platinum[J]. Acta Phys. -Chim. Sin. 2014, 30(4), 686-692. doi: 10.3866/PKU.WHXB201402142

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Model Simulation and Analysis of Spatiotemporal Dynamics for the Electro-Oxidation of Sulfide on Platinum

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