Abstract
Hybrid nanostructures of amorphous cobalt oxide (Co3O4) and crystalline gold nanoparticles (AuNPs) showed strongly enhanced OER activity compared to pure amorphous Co3O4. Particularly, gold nanorods (Au NRs) integrated amorphous Co(3)O(4)nanostructures (aCo(3)O(4)/Au NRs) required significantly low overpotential (225 mV) to produce geometric current density and needed 336 and 398 mV for achieving current density of 100 and 400 mA/cm(2), respectively. Further, aCo(3)O(4)/Au NRs displayed good stability over 40 h at 336 mV.