Fig. 4: Hydrogen bond.
From: Enhanced oxygen evolution over dual corner-shared cobalt tetrahedra
a The calculated most likely paths in the OER on the YBC4 (110) surface. The free energies of different possible surface statuses in each proton-coupled electron transfer step are also presented. The O involved in the OER is highlighted in green. b The active structural motif of mono-µ-oxo-bridged Co in a tetrahedral geometry. c–e The key intermediate steps in the proposed OER mechanism.
