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(a) CVs obtained for the reduction of 1 mM of H2O2 at Co3S4/GCNNS modified GCE in 0.2 M PBS for days from 1 to 10, (b) amperometric i–t curve obtained for Co3S4/GCNNS modified GCE for 4000s at an applied potential of −0.7 V in 0.2 M PBS pH 7.2.
