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. 2015 Jun 23;6:7261. doi: 10.1038/ncomms8261

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(a–d) The general efficacy of galvanostatic cycling in improving the OER activities of Co, Ni, Fe and NiFe oxides in 0.1 M KOH. Two-cycle NiFeO_x/CFP exhibits better performance than the Ir/C benchmark. (e,f) The OER polarization curves and the corresponding Tafel plots of pristine and 2-cycle NiFeO_x/CFP in 1 M KOH. The polarization scanned from positive potential to negative in the inset indicates the onset potential of 2-cycle NiFeO_x/CFP at ∼1.43 V. The Tafel slope of 2-cycle NiFeO_x/CFP is 31.5 mV per decade, better than the Ir/C benchmark. (g) Two-cycle NiFeO_x/CFP exhibits an excellent OER stability, achieving 10 mA cm⁻² anodic current at only 1.46 V versus RHE for over 100 h without degradation. This is better than the Ir/C benchmark.