Spin Balance Over Janus Ir-Co Magnetic Atoms for Efficient Acidic Water Oxidation

Monodisperse and substitute Co were doped into edge-sharing [IrO 6 ] octahedra of Ca 2 IrO 4 model catalyst, which usually present the intrinsic and strong stability for acid oxygen evolution reaction (OER) The optimized Janus Co–Ir local structure triggers spin balance effect with optimal e g 1 orbital and uneven t 2g orbital despite the large crystal field of Ir, which co-promote the OER activity with a relatively stable crystal structure. Different from the slowly kinetics of adsorbates evolution mechanism on Ca 2 IrO 4 , superoxide path mechanism occurs on Co doped Ca 2 IrO 4 based on the assignment of *OO on dual active sites of Ir and Co.