Abstract
In this report, we present results on the electrocatalytic activity of conducting polymers [polyaniline (PANI) and polypyrrole (PPy)] toward the electrochemical oxygen reduction reaction (ORR) to hydrogen peroxide (H2O2). The electropolymerization of the polymers and electrolysis conditions were optimized for H2O2 production. On flat glassy carbon (GC) electrodes, the faradaic efficiency (FE) for H2O2 production was significantly improved by the polymers. Rotating disc electrode (RDE) studies revealed that this is mainly a result of blocking further H2O2 to the water reduction pathway by the polymers. PPy on carbon paper (CP) significantly increased the molar production of H2O2 by over 250% at an average FE of above 95% compared to bare CP with a FE of 25%. Thus, the polymers are acting as catalysts on the electrode for the ORR, although their catalytic mechanisms differ from other electrocatalysts.
Highlights
In order to reduce the dependence on fossil fuels, great effort is made on exploration and utilization of inexhaustible and renewable energy sources such as solar energy.[1,2] To overcome the bottleneck of coordination in between energy supply and demand, we need long-term energy storage systems
The first step was to prepare and investigate polyaniline and polypyrrole coated on glassy carbon (GC) electrodes (GC/PPy)
An Ag/ AgCl (3 M KCl) (Messtechnik Meinsberg) electrode in a Luggin capillary was used as the reference electrode (RE) and a platinized electrode as the counter electrode (CE)
Summary
In order to reduce the dependence on fossil fuels, great effort is made on exploration and utilization of inexhaustible and renewable energy sources such as solar energy.[1,2] To overcome the bottleneck of coordination in between energy supply and demand, we need long-term energy storage systems. Oxygen (O2) reduction products such as hydrogen peroxide (caHrr2iOer2s).3−h5aBveesidbeesena investigated as potential use as a high energy fuel, H2O2 is a density versatile chemical with high demand for several applications such as organic synthesis,[6−8] paper production,[8,9] sanitizing, and bleaching.[8]. According to its unique feature of being an oxidizing agent as well as a reducing agent, it was introduced to the instrumentation of smart and delocalized fuel cells in a onecompartment cell configuration.[10−12] Independent of the energy release pathway, the reaction products are either O2 or H2O, of which both are, for example, educts for hydrogen peroxide production, offering a complete chemical recycling
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