Accordingly, the average oxidation state of Ru for N 0.1 M 0.1 RO is calculated to be +3.79 for N 0.1 M 0.1 RO, +3.32 for N 0.1 M 0.1 RO 50 h@10 mA cm −2 , and +3.26 for N 0.1 M 0.1 RO 150 h@200 mA cm −2 , confirming that the average oxidation state of Ru exhibits a decreasing trend after the long-term stability measurement.
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Synergistic niobium and manganese co-doping into RuO<sub>2</sub> nanocrystal enables PEM water splitting under high current.
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