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Abstract: In this paper, LaNi0.6Co0.4O3 (LNC) nanoparticles were synthesized by the sol–gel method, and the structure and morphology of LNC nanoparticles were characterized by X-ray diffraction spectrum, scanning electron microscopy and transmitting electron microscopy. And then, LNC was used to modify carbon paste electrode (CPE) without any adhesive to fabricate hydrogen peroxide and glucose sensor, and the results demonstrated that LNC exhibited strong electrocatalytical activity by cyclic voltammetry and amperometry. In H2O2 determination, linear response was obtained in the concentration range of 10nM–100μM with a detection limit of 1.0nM. In glucose determination, there was the linear region of 0.05–200μM with a detection limit of 8.0nM. Compared with other reports, the proposed sensor also displayed high sensitivity toward H2O2 (1812.84μAmM−1 cm−2) and glucose (643.0μAmM−1 cm−2). Moreover, this prepared sensor was applied to detect glucose in blood serum and hydrogen peroxide in toothpaste samples with satisfied results, indicating its possibility in practical application. [Copyright &y& Elsevier]

Highlights: [•] Spinel-type Co x Ni1−x Fe2O4 (x =0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) were synthesized. [•] Co x Ni1−x Fe2O4 were first employed as novel enzyme mimic sensing materials of H2O2. [•] Co0.5Ni0.5Fe2O4/CPE showed excellent electrocatalytic activity to H2O2. [•] Co0.5Ni0.5Fe2O4/CPE was successfully applied to determine H2O2 in toothpastes. [Copyright &y& Elsevier]