Electrocatalytic oxygen reduction to hydrogen peroxide by oxidized graphene aerogel supported cubic MnCO3 for antibacteria in neutral media

The electrochemical synthesis of hydrogen peroxide (H 2 O 2 ) based on 2-electron oxygen reduction reaction (ORR), is a particularly promising alternative route for in-situ application. Herein, we prepared the oxidized graphene aerogel supported cubic manganese carbonate composites (GO x /MnCO 3 ) with different GO and MnCO 3 ratio through a simple co-precipitation/in-situ coating method. The GO x /MnCO 3 composites, with uniformly wrapping of GO on the surface of MnCO 3 cubic, display high conductivity and abundant catalytic sites for 2-electron ORR. The G 0.2 M shows the best ORR catalytic performance, onset potential of 0.635 V RHE , high H 2 O 2 production selectivity and high stability in 3.5% NaCl electrolyte. Based on this, G 0.2 M as oxygen reduction electrocatalyst , has good antibacterial effect at 0.55 V RHE on the stainless-steel. The antibacterial mechanism is mainly due to the electrocatalytic oxygen reaction of H 2 O 2 and the side reaction of •OH and O 2 •- . This provides an impressive, effective and environmentally friendly electrochemical approach for antibacterial and antifouling applications.