Cobalt-based materials with abundant source and inexpensive character hold great potential to replace platinum-based catalysts.However,the performance test of powder catalyst inevitably uses the binders,which are easy to accumulate and bury the active site,and then has a serious impact on the performance.Co3O4/CuONWs hierarchical self-supported electrode with Co-based dodecahedron in series was constructed on copper network.The hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)performance in alkaline system was investigated.The results show that for HER,Co3O4/CuONWs can reach a current density of 20 mA·cm-2 with an overpotential of 232 mV.For OER,Co3O4/CuONWs has an overpotential of 320 mV at a current density of 20 mA·cm-2,indicating that Co3O4/CuONWs displays better HER and OER performance than that of the commercial Pt/C catalyst.Moreover,the zinc-air battery assembled with the as-prepared electrode can be stablely cycled for 160 h without significant voltage change.
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