A novel spray-pyrolyzed high-entropy electrode for efficient photoelectrochemical water splitting without bias potential

Photoelectrochemical behavior of spray-pyrolyzed (MgNiCuCoZnFe)O x high entropy compounds (HEC) is shown. The study revealed bare HEC had a higher anodic photocurrent density compared to the bare ZnO and heterojunction electrodes. However, the detectivity (2.7 × 10 10 Jones) and sensitivity (275%) of the heterojunction electrodes were superior to bare HEC electrodes. FZO and ZnO layers have IPCE values below 10%, while the heterojunction has 83% at 367 nm and 63% at 382 nm. ABPE values of the heterojunction electrode were calculated for 382 nm, 367 nm, and AM1.5 light sources. The maximum ABPE at 382 nm, 367 nm, and AM1.5 light was 45.3% at 0.3 V, 58.33% at 0 V bias, and 1.22% at 0.5 V bias, respectively.