Nanoparticle‐ and Nanotube‐Modified Electrodes: Response of Drop‐Cast Surfaces,ChemElectroChem

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Nanoparticle‐ and Nanotube‐Modified Electrodes: Response of Drop‐Cast Surfaces
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-11-03 , DOI: 10.1002/celc.202001295
Yifei Zhang ₁ , Archana Kaliyaraj Selva Kumar ₁ , Danlei Li ₁ , Minjun Yang ₁ , Richard G. Compton ₁

Affiliation

The morphology of electrodes modified by drop casting layers of multi‐walled carbon nanotubes (MWCNTs) and platinum nanoparticles (PtNPs) is investigated and shown to exhibit significant heterogeneity, both in the form of ‘patchy’ surfaces and of ‘coffee rings’ formed after evaporation of the carrier solvent. The variation of the heterogeneity with total average coverage is studied and the consequences for quantitative analytical voltammetry assessed. Specifically, the oxidation of bromide in aqueous solution is examined in the case of MWCNTs‐modified electrodes and the oxidation of aqueous As(III) in that of PtNPs‐modified electrodes. In both cases, significant deviations from the expected voltammetry are observed, even for average coverages that correspond to much in excess of a monolayer of CNTs or NPs. The observed voltammetry is related to the observed structure and the use of such modified electrodes, without concomitant microscopic surface characterization, is caveated.

中文翻译：

纳米粒子和纳米管修饰电极：滴铸表面的响应

研究了通过多壁碳纳米管（MWCNT）和铂纳米颗粒（PtNPs）的流延浇铸层修饰的电极的形态，并显示出明显的异质性，无论是“斑点”表面还是“咖啡环”蒸发载体溶剂。研究了异质性随总平均覆盖率的变化，并评估了定量分析伏安法的后果。具体而言，在MWCNTs修饰的电极中检查了水溶液中溴化物的氧化，在PtNPs修饰的电极中检查了As（III）水溶液的氧化。在这两种情况下，均观察到与预期伏安法的显着偏差，即使对于平均覆盖范围而言，其远超过单层的CNTs或NPs。

更新日期：2020-11-17

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