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The hybrid was characterized by M\u00f6ssbauer spectroscopy, high\u2010angle annular dark\u2010field imaging, electron energy\u2010loss spectroscopy, and electrochemical techniques, which revealed a strong interaction of dichromate with the nanoparticle surface. Electrochemical characterization showed lower charge\u2010transfer resistance, better electrochemical performance, and more reversible electrochemical behavior with respect to naked SAMNs. Moreover, SAMN@Cr<jats:sup>VI<\/jats:sup> is an excellent electrocatalyst for hydrogen peroxide reduction. Furthermore, an enzyme, namely, bovine serum amine oxidase (BSAO: EC\u20051.4.3.6), was immobilized on SAMN@Cr<jats:sup>VI<\/jats:sup> by self\u2010assembly to give a ternary hybrid nanostructured catalyst for polyamine oxidation (SAMN@Cr<jats:sup>VI<\/jats:sup>\u2010BSAO). 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