Organic Contamination of Highly Oriented Pyrolytic Graphite As Studied by Scanning Electrochemical Microscopy
作者： Nikoloz Nioradze , Ran Chen , Niraja Kurapati , Anastasia Khvataeva-Domanov , Stéphane Mabic
DOI: 10.1021/ACS.ANALCHEM.5B00213
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摘要: Highly oriented pyrolytic graphite (HOPG) is an important electrode material as a structural model of graphitic nanocarbons such graphene and carbon nanotubes. Here, we apply scanning electrochemical microscopy (SECM) to demonstrate quantitatively that the electroactivity HOPG basal surface can be significantly lowered by adsorption adventitious organic impurities from both ultrapure water ambient air. An SECM approach curve (ferrocenylmethyl)trimethylammonium (FcTMA+) shows higher reactivity aqueous concentration impurities, i.e., total (TOC), decreased ∼20 ∼1 ppb. SECM-based nanogap voltammetry in ppb-TOC yields unprecedentedly high standard electron-transfer rate constants, k0, ≥17 ≥13 cm/s for oxidation reduction FcTMA2+/+ couple, respectively, at respective tip–HOPG distances 36 45 nm. Anomalously, k0 values widths are different between ...
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