Single-layer CoFe hydroxides for efficient electrocatalytic oxygen evolution.

Single-layer CoFe layered double hydroxides (CoFe LDH-S) are successfully fabricated under near-anhydrous conditions due to the weakened hydrogen bonds between monolayers. Benefiting from the single-layer structure with rich defects and disordered lattices, CoFe LDH-S affords superior OER activity compared to its bulky counterparts and most of the recently reported non-precious electrocatalysts.