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(A) LSV curves for NiO@Ni/WS2/CC, RuO2/CC, and NiO@Ni/CC with a scan rate of 5 mV s–1 for OER. (B) The corresponding Tafel plots of NiO@Ni/WS2/CC, RuO2/CC, and NiO@Ni/CC. (C) Chronopotentiometric curve of NiO@Ni/WS2/CC with constant current density of 50 mA cm–2. (D) LSV curves of water electrolysis for NiO@Ni/WS2/CC∥NiO@Ni/WS2/CC, RuO2/CC∥Pt/C/CC, and NiO@Ni/CC∥NiO@Ni/CC with a scan rate of 2 mV s–1.
