Construction method for photocathode indirect competition sensor and evaluation method

A construction method for a photocathode indirect competition sensor, comprising the following steps:

• S1, synthesizing Bi2O3/CuBi2O4, Bi2O3, and CuBi2O4 using a high-temperature calcination method, uniformly dispersing Bi2O3/CuBi2O4 in a dispersion solution by ultrasound, and coating an electrode with droplets, and naturally drying the electrode to obtain a Bi2O3/CuBi2O4/ITO-based sensing platform;
• specifically:
• grinding Cu(NO3)2·3H2O, Bi(NO3)3·5H2O, and glucose at a molar ratio of 1:1:7 to 1:5:7 in quartz agate mortar for 5-10 minutes;
• drying the mixture at 60° C. for several hours in a ceramic crucible to obtain an anhydrous precursor;
• heating the precursor to 400° C., and maintaining the temperature in a tube furnace for 20-40 minutes;
• and
• grinding obtained combustion residues in the quartz agate mortar, then calcining same at 500° C. for 2-6 hours in the ceramic crucible, and finally obtaining Bi2O3/CuBi2O4;
• S2, performing treatment using a Perdew-Burke-Ernzerhof method with generalized gradient approximation;
• specifically:
• for a Bi2O3 (001)/CuBi2O4 (100) heterostructure, setting the cut-off energy to be 520 eV;
• setting k points for geometric optimization in 2×2×1, and using a 4×4×1 mesh for electronic structure calculation;
• and
• setting a vacuum space to be 20 Å to avoid periodic interactions, wherein all structures are loose until the maximum residual force on constituent atoms is less than 0.03 eV/Å;
• and
• S3, calculating a photoinduced electron Z-type transfer path and an energy band structure of Bi2O3 and CuBi2O4 using a density functional theory (DFT), and constructing a Bi2O3/CuBi2O4-based sensor.