Abstract
The oxygen reduction reaction (ORR) was studied on the polycrystalline Pt electrode in 0.1 M NaCl electrolyte containing various amounts of acetonitrile (AcN). The state of the electrode surface was characterized by the cyclic voltammetry in oxygen free electrolytes, while ORR studies were performed on the polycrystalline Pt rotating disc electrode by the linear sweep voltammetry in oxygen saturated electrolytes. The acetonitrile is chemisorbed on Pt over a wide potential range, inhibiting both hydrogen adsorption and oxide formation. The extent of AcN chemisorption depends on its concentration in the solution. Initial potential of oxygen reduction is shifted negatively, while the ORR current is increasingly reduced with the increase of AcN concentration. Complete inhibition of ORR in the potential range of AcN and Cl-anion coadsorption is achieved for (0.1 M NaCl + 1 M AcN) solution.
Highlights
The oxygen reduction reaction (ORR) was studied on a polycrystalline Pt electrode in 0.1 M NaCl electrolyte containing various amounts of acetonitrile (AcN)
Rotating disc electrode (RDE) studies of oxygen reduction on Pt(poly) in aprotic acetonitrile solutions [14,15] have shown that the first step is a reversible one and occurs with the exchange of one electron giving a superoxide anion as a product
Neutral chloride solution containing a constant concentration of chlorides will be used, while acetonitrile will be added in a wide range of concentrations up to saturation, when the ORR becomes completely inhibited in the potential range of AcN and anion coadsorption
Summary
The oxygen reduction reaction (ORR) was studied on a polycrystalline Pt electrode in 0.1 M NaCl electrolyte containing various amounts of acetonitrile (AcN). Rotating disc electrode (RDE) studies of oxygen reduction on Pt(poly) in aprotic acetonitrile solutions [14,15] have shown that the first step is a reversible one and occurs with the exchange of one electron giving a superoxide anion as a product.
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