Engineering Electron Lifetime for High-Performance Heterostructured 1D CdS Photocatalyst

Abstract

The development of high-performance photocatalysts is essential for advancing sustainable hydrogen production. In the present work, an innovative approach to electron lifetime engineering aimed at enhancing the photocatalytic performance of 1D CdS nanowires by strategically incorporating Ni and titanium nitride (TiN) layers. It demonstrates the electron lifetime mechanism of 1D photocatalyst can be optimized through the introduction of uneven surface and heterojunction. The lifetime of electrons is influenced by the interplay between geometry and electronic structure, directly correlating with photocatalytic efficiency in an exponential decay pattern. Time-correlated single photon counting (TCSPC) measurements provide detailed insights into recombination events and non-radiative properties. Transmission electron microscopy (TEM) and ultraviolet photoemission spectroscopy (UPS) analyses reveal that the prolonged electron lifetime in CdS/Ni/TiN photocatalysts is attributed to the combination of the uneven surface and the passivation of surface energy state on CdS. The single-molecule surface catalytic sites are also observed from super-resolution fluorescence imaging. This perspective first illustrates an integrated discussion on hydrogen production, optical properties, electronic structure, and surface-active sites. The optimal heterostructured CdS achieves a 20.55-fold improvement in hydrogen production. Electron lifetime engineering offers a promising pathway in high-performance 1D photocatalysts for hydrogen production and other energy conversion applications.