Local tensile strain boosts the electrocatalytic ammonia oxidation reaction.

The introduction of local tensile strain in Ni(OH) 2 nanosheets accelerates the Ni(OH) 2 -to-NiOOH transition and boosts the electrocatalytic ammonia oxidation reaction (EAOR), i.e. , reducing the onset potential by 80 mV, doubling both the current density and N 2 faradaic efficiency, and enabling 1000 hours of operation at 160 mA cm -2 .