Efficient Photocatalytic CH4Conversion to C1 Oxygenates on Pd/C-TiO2/g-C3N4Photocatalyst

In this work, a Pdx/C-TiO2/g-C3N4-yphotocatalyst was synthesized by combining g-C3N4with Ti3C2through heat treatment, followed by loading with noble metal Pd. Morphological characterization and XPS before and after reaction revealed the formation of a C-TiO2/g-C3N4Z-scheme heterojunction system with Pd deposited on top. The optimal catalyst, Pd0.8/C-TiO2/g-C3N4-5, exhibited significantly enhanced total C1 yields under mild conditions, achieving 6.1 and 2.6 times the yields of g-C3N4and C-TiO2, respectively. Notably, the HCHO yield was improved to 3854.79 μmol·g–1·h–1. Mechanistic studies indicated that the C-TiO2/g-C3N4heterojunction significantly enhanced the CH4conversion performance by effectively suppressing photogenerated charge recombination. Additionally, the loaded Pd promoted CH4adsorption and activity, further improving the CH4conversion efficiency. Furthermore, Pd contributed to the high C1 yield by accelerating the generation of both and •OH radicals.