Application of a TEMPO-Polypyrrole Polymer for NOx-Mediated Oxygen Electroreduction

The oxygen reduction reaction (ORR) is one of the key processes for electrochemical energy storage, such as cathode process in fuel cells and metal–air batteries. To date, efficiency ORR half-reaction limits overall performance these storage devices. Traditional platinum-based materials are expensive cannot provide desired efficiency. As an alternative, a new catalytic scheme was proposed, which consisted electrode modified with TEMPO-containing conductive polymer solution redox mediator system based on nitrogen oxides (NOx). NOx perfect solution, which, however, be efficiently reduced onto pristine electrode, while TEMPO inactive itself but catalyzes NO2 surface. Together, catalysts have synergistic effect, enabling efficient acidic medium. In present study, synthesis novel its application described. proposed may increase proton-exchange