The ABO3-type perovskite oxide has variable electrocatalytic activity and physicochemical properties, which is a promising electrochemical sensing material for hydrogen peroxide (H2O2). Based on electrospinning and high-temperature tube furnace calcination, using LaNiO3-type perovskite oxide as a template we have synthesized the dual-phase La0.9Sr0.1NiO3 nanofibers (LaSrNiO NFs) perovskite oxides containing La2NiO4 and La0.9Sr0.1NiO3 with unique one-dimensional tubular nanofiber structures by A-site (Sr2+) doping. The A-site doping technique significantly improves the redox properties of the perovskite oxide itself, which provides good conditions for the electrochemical sensing of H2O2. In addition, the porous tubular nanofiber structures also provide excellent ion transport channels and contact sites for the H2O2 sensing process. The LaSrNiO NFs exhibit great linearity maintaining a wide detection range (10 ~ 7000 µM), low limit detection (LOD = 0.018 M, S/N = 3), extraordinary sensitivity (1667.9 A·mM-1·cm-2) and a rather fast response time (0.9 s) as H2O2 electrochemical sensing materials. In addition, LaSrNiO NFs have been successfully applied to practical H2O2 detection in milk and bovine serum. Therefore, the LaSrNiO NFs modified material has great prospects in practical application as electrochemical sensing of H2O2.

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