Bismuth Detection in Alkaline Electrolyte via Anodic Stripping Voltammetry for Battery Separator Evaluation,Electroanalysis

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Bismuth Detection in Alkaline Electrolyte via Anodic Stripping Voltammetry for Battery Separator Evaluation
Electroanalysis ( IF 2.7 ) Pub Date : 2020-11-10 , DOI: 10.1002/elan.202060412
David J. Arnot ₁ , Timothy N. Lambert ₁

Affiliation

Anodic stripping voltammetry (ASV) has been widely used for the detection of several heavy metal ions in neutral and acidic solution, in many cases employing electrodes and/or solutions incorporating Bi. In this work we demonstrate that Bi(OH)₄⁻ ion concentration can be measured in highly alkaline 8.5 M KOH solution using ASV. The addition of Pb in similar concentrations to the Bi(OH)₄⁻ being measured is shown to improve both the sensitivity and precision of the method. When the Pb additive is employed, a formal limit of detection of 8.5 ppb is achieved, compared to 17.3 ppb when the Pb additive is not used. Due to the use of Bi additives in alkaline battery chemistries, it follows that separators which limit Bi(OH)₄⁻ diffusion into the bulk electrolyte and away from the electrodes are of interest. For this purpose, we utilize ASV to determine Bi(OH)₄⁻ diffusion rates through Celgard 3501, cellophane 350P00, and Nafion 211. Bi(OH)₄⁻ crossover rates, as determined by ASV, are shown to be repeatable and consistent with expectations from the known separator structure.

中文翻译：

阳极溶出伏安法检测碱性电解液中的铋，用于电池隔板评估

阳极溶出伏安法（ASV）已广泛用于检测中性和酸性溶液中的几种重金属离子，在许多情况下，采用的是电极和/或掺有Bi的溶液。在这项工作中，我们表明，铋（OH）₄^-的离子浓度可以在高碱性8.5米KOH溶液使用ASV测量。Pb的相似浓度到碧（OH）加入₄^-被测量被示出，以提高该方法的灵敏度和精确度。当使用Pb添加剂时，与未使用Pb添加剂时的17.3 ppb相比，正式检测极限为8.5 ppb。由于在碱性电池化学使用铋添加剂，它遵循隔板从而限制的Bi（OH）₄^-扩散到本体电解质中并远离电极是令人感兴趣的。为了这个目的，我们利用ASV确定的Bi（OH）₄^-通过的Celgard 3501，玻璃纸350P00，和Nafion 211的Bi的扩散速率（OH）₄^-交叉率，如由ASV确定，被示出为可重复和一致已知分离器结构的期望。

更新日期：2020-11-10

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