▎ 摘　　要

Selenium modified ruthenium/ reduced graphene oxide ( RuSe/rGO) is explored as an electrocatalyst towards VO2+/VO2+ redox couples in vanadium redox flow batteries. Compared with the rGO electrode, the RuSe/rGO can significantly alleviate the polarization and improve the reversibility of the redox reaction, by virtue of the excellent catalytic activity and electronic conductivity.