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Nanoporous Ni nanoparticles (NPs) have been successfully prepared by a facile two-step process, hydrogen plasma-metal reaction (HPMR) and chemical dealloying. Via the subsequent passivation at room temperature, an oxide layer is generated outside the Ni NPs as the result of surface oxidation. The passivated Ni@NiO NPs of 48 nm exhibit a highly porous structure with pore volume of 0.812 cm3/g. The...
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