关键字：HETEROJUNCTION; CONVERSION; SITES
摘要：The photocatalytic reduction of CO2 and H2O to form formic acid (HCOOH) holds promise for meeting the carbon-neutral target. However, the reduced efficiency of carrier separation and the material's vulnerability to photo-corrosion significantly impede its practical application. Herein, a 0D/1D Cu2O/W18O49 S-scheme heterostructure is prepared by in situ growing Cu2O nanocrystals on W18O49 ultrathin nanorods via the wet chemistry method. In situ irradiation X-ray photoelectron spectroscopy characterization uncovered the formation of a stable internal electric field (IEF) at the heterojunction interface between W18O49 and Cu2O, which facilitates the separation of photon-generated carriers through an effective interfacial S-scheme transmission mechanism. Small-sized Cu2O (5-10 nm) anchored on the ultrathin W18O49 nanorods exposes abundant active sites and enhances carrier separation while inducing electrons generated from W18O49 to consume the holes in Cu2O, thus preventing the oxidation of Cu2O. The W18O49/Cu2O S-scheme heterostructure with the optimized composite ratio (40 % Cu:W) exhibited excellent performance in HCOOH production (56.42 mu mol g(-1)h(-1), 23.2-fold enhancement compared to pristine Cu2O) and 100 % selectivity for CO2 photoreduction in water without any sacrificial reagents. This work provides a rational method for improving the stability of the catalyst and regulating charge carrier migration for highly selective CO2 photoreduction in water.
卷号：362
期号：
是否译文：否