Enhancing the Selectivity of H2O2 Electrogeneration by Steric Hindrance Effect

Selective hydrogen peroxide (H 2 O 2 ) electrogeneration by oxygen reduction reaction (ORR) is an efficient and promising synthetic method for H 2 O 2 production. Herein, we build a particular inorganic–organic interface to enhance the electrocatalytic selectivity of reduced graphene oxide (rGO) aerogels for H 2 O 2 electrogeneration by modifying rGO aerogels with polyethyleneimine (PEI). The three-dimensional porous structure of aerogels and the steric hindrance effect of PEI on rGO endow PEI-functionalized rGO (rGO/PEI) aerogels with enhanced selectivity (90.7%), production rate (106.4 mmol g cat –1 h –1 ), and durability for H 2 O 2 electrogeneration by the two-electron pathway of ORR.