Self-assembled aggregates of SnO2/Bi2O3 heterojunction for electrochemical H2O2 detection

A novel electrochemical sensor was created for the rapid and effective detection of hydrogen peroxide, employing a SnO₂/Bi₂O₃-modified electrode. SnO₂/Bi₂O₃ with heterostructure was prepared using a simple hydrothermal approach, followed by the comprehensive characterization of structure, morphology and properties. Optimal SnO₂/Bi₂O₃ material exposed (101) crystal planes of SnO₂ and (-122) crystal planes of Bi₂O₃. The sensor's performance for detecting hydrogen peroxide was evaluated, revealing a significant sensing capability, with a high sensitivity of 318.45 μA mM⁻¹cm⁻² and a low detection limit (LOD) of 0.29 μM, and as-prepared SnO₂/Bi₂O₃ is far superior to some reported materials. Additionally, the sensor's response to H₂O₂ was examined in the presence of different potential interfering species. The findings confirm that the designed sensor exhibits high selectivity, reproducibility and stability for the detection of H₂O₂, and notably SnO₂/Bi₂O₃ was used to construct chip paper electrodes, and achieve portable and highly-sensitive detection of H₂O₂. These findings highlight the potential of the as-synthesized SnO₂/Bi₂O₃ as a promising material for hydrogen peroxide detection in the environment and health fields.