Ultrasensitive hydrogen peroxide electrochemical sensor based on dual-phase perovskite oxide tubular nanofiber

The ABO(3)-type perovskite oxide has variable electrocatalytic activity and physicochemical properties, which make it 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 synthesized dual-phase La0.9Sr0.1NiO3 nanofiber (LaSrNiO NF) perovskite oxides containing La2NiO4 and La0.9Sr0.1NiO3 with unique one-dimensional tubular nanofiber structure 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. LaSrNiO NFs, as H2O2 electrochemical sensing materials, have a wide linear response range of 1 to similar to 7000 mu M at a low applied potential of 0.2 V and a fast response time (t = 0.9 s), as well as good selectivity and admirable long-term stability. Furthermore, a low detection limit (LOD, S/N = 3) of 0.018 mu M and excellent sensitivity of 1667.9 mu A mM(-1) cm(-2) were obtained in voltammetry cycle tests. These results indicate that LaSrNiO NFs prepared by effective doping of Sr2+ are promising for the determination of H2O2.

Automated summary

By utilizing A-site doping technique, we successfully synthesized dual-phase La0.9Sr0.1NiO3 nanofiber perovskite oxide materials with unique tubular nanofiber structure and excellent electrochemical properties, providing a promising approach for hydrogen peroxide sensing with wide linear response range, sensitivity, and stability.