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Science China Press

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(a) Schematic illustration of alkaline HER on Ni/NiO heterosurfaces. (b) Schematic dependence of alkaline HER activity on the surface compositions of Ni/NiO heterosurfaces. (d) Polarization curves and (e) the relationship between the overpotentials at 10 mA cm?2 and Ni/NiO ratio in various catalysts.

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