Abstract
Competing double-exchange and super-exchange interactions yield rich chemistry for understanding robust oxygen evolution activity in Ru-doped lanthanum strontium manganite, with an overpotential of 300 mV at 10 mA cm−2 and a Tafel slope of 110 mV dec−1. Favourable redox potentials of Mn3+/Mn4+ and Ru4+/Ru5+ lead to improved charge transfer kinetics for OER activity.