Inspired by copper-based oxygen reduction biocatalysts, we have studied the electrocatalytic behavioro fa Cu-based MOF (Cu-BTT) for oxygen reduction reaction( ORR) in alkaline medium. This catalyst reducest he oxygen at the onset (E onset )a nd half-wavep otential (E 1/2 )o f0 .9 40 Va nd 0.778 V, respectively.T he high halfway potential supports the good activity of Cu-BTT MOF.T he high ORR catalytic activity can be interpreted by the presence of nitrogen-rich ligand (tetrazole) and the generation of nascent copper(I) duringt he reaction. In addition to the excellent activity,C u-BTT MOF showed exceptionals tability too, which was confirmedt hrough chronoamperometry study,w here current was unchanged up to 12 h. Further,t he 4-electrons transfer of ORR kinetics was confirmed by hydrodynamic voltammetry.T he oxygen active center namely copper(I) generation during ORR has been understood by the reduction peak in cyclic voltammetry as well in the XPS analysis.
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