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Hierarchical sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx nano-architecture was fabricated by dealloying a Ni25Mn75 precursor in 1.0M (NH4)2SO4 solution followed by electrochemical oxidation in 1.0M KOH solution. The dealloying process would generate both uniform nanoporous structure (chemical dealloying) and nanoporous structure with big crack channels (electrochemical dealloying at high...
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