Cr 2 S 3 -Cr 2 O 3 /Poly-2-aminobenzene-1-thiol as a Highly Photocatalytic Material for Green Hydrogen Generation from Sewage Water.

This study highlights the utilization of the Cr 2 S 3 -Cr 2 O 3 /P2ABT nanocomposite photoelectrode for efficient and highly sensitive photon absorption, enabling the generation of green hydrogen through the production of hot electrons upon illumination. The nanocomposite is synthesized via a one-pot reaction using K 2 Cr 2 O 7 and 2-aminobenzene-1-thiol monomer, and the presence of Cr 2 S 3 -Cr 2 O 3 is confirmed by XRD and XPS analysis within the composite. The optical properties of the Cr 2 S 3 -Cr 2 O 3 /poly-2-aminobenzene-1-thiol composite exhibit wide spectral coverage from UV to IR, with a bandgap of 1.6 eV. The diverse morphological behavior observed in the composite correlates with its optical properties, with the cleft spherical particles of the pure polymer transforming into rod-like structures embedded within the polymer matrix. The generated hydrogen gas demonstrates an impressive efficiency of 40.5 mole/10.cm 2 .h through electrochemical testing. The current density (J ph ) values are evaluated under different light frequencies using optical filters ranging from 730 to 340 nm, resulting in Jph values of 0.012 and 0.014 mA.cm -2 , respectively. These findings present a promising avenue as green hydrogen for industrial applications, leveraging the potential of the Cr 2 S 3 -Cr 2 O 3 /P2ABT nanocomposite photoelectrode.