Template-synthesizing hollow cubic CeO2/Co3O4 heterostructure as electrocatalysts for sensing hydrogen peroxide

Abstract

H₂O₂ as an important intermediary is becoming more widely acknowledged, and interest in its detection has increased significantly. Herein, we developed a hollow cubic CeO₂/Co₃O₄ heterostructure and further employed as non-enzymatic H₂O₂ detection sensor through a series of facile synthesis strategies using cobalt-based zeolitic imidazolate framework as a template. The synthesized CeO₂/Co₃O₄ with huge cavity structure offers numerous electrocatalytic active sites for the target analyte, thus endowing its high sensitivity (60.5 μA^. mM⁻¹cm⁻²), excellent selectivity, broad detection range for H₂O₂ (10 μM -1 mM), and favorable working potential (-0.45 V). Not only that the CeO₂/Co₃O₄ sensor achieved satisfactory recovery and accuracy in real lake-water samples.