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UV–vis absorption spectra of 4-NP reduction with (a) 0.1 mg of Oh and 1 mg of (b) DHP and (c) EHP morphologies of the as-prepared Cu2O nanocatalysts. (d) Graph of ln(A/A0) vs time giving the comparative rate constants of the three morphologies along with bulk Cu2O and cube morphology with the (100) facet.
