Cyclic voltammetry

Abstract

Cyclic voltammetry (CV) is the most commonly used method in electrocatalysis. The technique offers a first view on electrode/electrolyte systems in the potential window of interest. For most metals and alloys, reproducible results can be obtained after cycling the surface in a base electrolyte and over suitable potential ranges. Cyclic voltammograms of some metal/electrolyte interfaces and some selected charge transfer reactions, of interest in fuel cell electrocatalysis, are presented. The use of CV for investigations, e.g., with ultramicro‐electrodes, rotating electrodes (disc and ring/disc), as well as in combination with online mass spectroscopy and Fourier‐transform infrared radiation spectroscopy, is outlined.

Preparation and characterization of sulfonated block-graft copolyimide/sulfonated polybenzimidazole blend membranes for fuel cell application

“…Yield: 32%. 1 H NMR (deuterated dimethyl sulfoxide (DMSO-d 6 )): 9.1 − 8.7 ppm (br, naphthalene protons in NTDA moieties), 8.3 ppm (br, ortho-protons in DABA moieties), 7.8 ppm (br, para-proton in DABA moieties), 7.7 − 7.4 ppm (br, aromatic protons in BSPB moieties), 4.3 ppm (br, alkyl protons in BSPB moieties), 3.0 ppm (br, protons in TEA), 2.3 ppm (br, alkyl protons in BSPB moieties), 2.1 ppm (br, alkyl protons in BSPB moieties), 1.1 ppm (br, protons in TEA).…”

“…The polymer electrolyte fuel cell (PEFC) is receiving considerable attention as an alternative energy source for various applications, especially in fuel cell vehicles, because of its high energy efficiency and no emissions of pollutants. 1 However, improvements in performance and durability and a reduction in cost are desired for broad commercialization. Proton exchange membranes are one of the key components in PEFCs and require various properties including high proton conductivity, high chemical and physical stabilities, and low gas permeability.…”

Design of High-Ionic Conductivity Electrodes for Direct Methanol Fuel Cells

“…This means that cyclic voltammetry can allow the study of electrode surfaces with very repeatable initial surface conditions from scan to scan [34]. Cyclic voltammetry is typically used as an early diagnostic tool before using more specialized methods to focus in on a behavior of interest [8].…”

Experimental Diagnostics and Diagnosis

“…In PEFCs, a sweep rate of around 50 mV/s is typical [11]. The general principle of the CV measurement is that the electrode of interest undergoes a steady voltage potential sweep from a low potential to a high potential and the resulting current generated at the electrode is measured.…”

“…11 Tafel slope preparation from corrected polarization curve data. Data are taken for a 50-cm 2 fully humidified PEFC at 80 • C, 270-kPa anode and cathode in a hydrogen/oxygen environment, for different mass loadings of platinum catalyst.…”