Interrelation Between the Interaction Parameter and the Width of the Adsorption Voltammetric Peak

It is known that the width of adsorption of a voltammetric peak is defined by lateral interactions in adsorption layer, so the peak width may be a key to intensity of these interactions. Correlation between the width of the peak and interaction parameter G has been examined in details. It is impossible to find the exact equation setting G as a direct function of peak width. Approximate equations are proposed to calculate G from the peak width with high accuracy in a wide range of G values. G value can be useful not only for characterization of lateral interactions in adsorbed layer (for finding adsorption isotherm parameters), but also for quick estimation of adsorption of electroactive substance.

众所周知，伏安峰（voltammetric peak）的吸附宽度由吸附层（adsorption layer）内的横向相互作用（lateral interactions）所决定，因此峰宽或可作为研判此类相互作用强度的关键指标。已有研究针对峰宽与相互作用参数G（interaction parameter G）之间的相关性展开了详尽考察。目前尚未能推导出将G直接表示为峰宽函数的精确方程式。本研究提出了若干近似方程，可在G值的宽广范围内以高精度通过峰宽计算得到该参数。相互作用参数G不仅可用于表征吸附层内的横向相互作用（例如求解吸附等温线（adsorption isotherm）的相关参数），还可用于快速估算电活性物质（electroactive substance）的吸附量。