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Hierarchical nanoporous Ni with both nanopores (less than 10nm) and big pores/channels (hundreds nm) was fabricated by chemically dealloying a diluted Ni15Al85 precursor in 1.0M NaOH aqueous solutions. Due to the active property of nanoscale Ni, the Ni nano-ligaments can be easily converted to Ni/Ni(OH)2 core–shell-like nano-composite by electrochemical oxidation. Compared with uniform nanoporous...
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