Reaction–diffusion equation model in the electrical double layer for exploring the response signal in electrochemical sensing

• DOI: 10.1142/s021798492450307x
• Publication Date: 2024-03-27T07:55:27Z
• Authors: Yanke Zhang; Wei Chen; Qingteng Lai; Zhengchun Liu
• Keywords: SIGNAL (programming language); Transient (computer programming); Reaction–diffusion system; Position (finance); Diffusion layer

Electron transfer in the electrode–solution interface is responsible for signal electrochemical sensor. However, Electrical Double-Layer (EDL) characteristic usually ignored modeling. Here, we constructed a model based on reaction–diffusion equation to describe dynamics EDL during sensing. With this model, many common experimental phenomena, such as transient/steady-state current variation or detection nonlinearization, can be unraveled by exploring effects of position, kinetics proportionality coefficient (k), and reaction order ([Formula: see text]). We also put forward some suggestions improve stability linear range future sensor design.