Designing electrode structures with high activity is very significant for energy conversion systems. However, single electrode materials often exhibit poor electronic transportation. To address this issue, we prepared P-Fe2O3 nanowire arrays through a convenient hydrothermal and phosphation method. The as-obtained electrode materials exhibited excellent electrocatalytic performance, which could be attributed to the P element decoration improving the reaction active sites. The as-obtained P-Fe2O3-0.45 nanowire arrays exhibited excellent OER activity with a low overpotential of 270 mV at 10 mA cm-2 (72.1 mV dec-1), excellent HER performance with a low overpotential of 126.4 mV at -10 mA cm-2, a small Tafel slope of 72.5 mV dec-1 and long durability. At the same time, the P-Fe2O3-0.45 nanowire arrays possessed a low cell voltage of 1.56 V at 10 mA cm-2.
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