作者：W. Duan, W. Li, G. Liao, Y. Wang, R. Cui, Y. Huang, W. Ma, R. Li, Z. Zhang
关键字：Exciton tunneling; Value-added oxidation; Hydrogen production; Local double-charge layers; Light-driven catalysis
论文来源：期刊
具体来源：https://doi.org/10.1021/acsami.6c08007
发表时间：2026年

Solar powered hydrogen production is an appealing artificial photosynthesis technology. However, the slow and disordered exciton migration generally results in high-frequency photoexciton recombination and poor microstructural stability. Herein, a quantum-size thickness of SiO2 nanolayer was coated on CdS nanocatalyst to prepare a CdS@SiO2 nanoparticles with stable interfacial microstructure via a interfacial atomic-scale regulation strategy, and Au nanococatalyst was immobilized on this composite nanoparticles to construct the synergistic donor (CdS)-acceptor (Au) exciton transfer system. This unique asymmetrical structure significantly enhanced the local polarization, promoted the photoexciton separation and induced the exciton tunneling through SiO2 nanobarrier to form a local double-charge layers (LDCL), effectively hindering photoexciton recombination. Therefore, the benzyl alcohol (BA)-to-benzaldehyde (BAD) value-added oxidation (20.67 mmol·g-1·h-1) and collaborative hydrogen production (16.88 mmol·g-1·h-1) could be achieved at the LDCL region under simulated sunlight-irradiation. The isotope tracing technique was adopted to prove that H atoms in both BA and H2O participated in the H2 generation. More importantly, this optimized nanophotocatalyst is obviously superior to the most catalysts reported in literature, and the BAD selectivity is close to 100% due to the asymmetric exciton distribution. By processing polyvinylidene fluoride networked membrane, stable catalytic performance was maintained even being recycled for 30-times. This study proposes an observable exciton dynamics based on semiconductor-nonconductor-metal junctions.