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(a) UV–visible spectrum and (b) X-ray diffraction (XRD) pattern of CuFe nanoparticles (NPs). (c) Hysteresis loops of CuFe NPs with different Fe/Cu ratios. (d) Quantification of H2O2 catalytic ability by 2′,7′-dichlorofluorescein diacetate (DCFH-DA, n = 4. *** p < 0.001, compared to Fe/Cu ratio of 2).
