2026-10-13T07:25:05Z https://www.scidb.cn/oai

10.57760/sciencedb.43902 2026-07-23T15:18:38Z

2026-07-23 Hydrogen-induced Ptσ+–O–Ti4+–(H–oxygen vacancy) Interfacial Sites in Pt/TiO2 for Enhanced Low-temperature CO Oxidation doi:10.57760/sciencedb.43902 en Understanding reconstructed interfacial sites is crucial for enhancing the catalytic conversion efficiency, as these sites can facilitate reactant adsorption, transformation, and desorption. Herein, we report an unconventional interfacial structure of Ptσ+–O–Ti4+–Hδ+–oxygen vacancy (OV), in which atomic hydrogen binds to Ti4+ sites via a charge-compensation mechanism involving subsurface OVs. This restructuring induced by hydrogen creates electron-rich Pt centers and interfacial oxygen, resulting in spatial elongation of the Pt–O and O–Ti bonds. This Ptσ+–O site, stabilized by –Ti4+–(H–OV), promotes the activation of CO adsorption/interfacially absorbed oxygen and interfacial lattice oxygen, effectively coupling the Langmuir-Hinshelwood and Mars-van Krevelen pathways. These sites facilitate the rapid CO2 formation and desorption. Consequently, this system achieves complete CO conversion at 120 °C with an ultralow Pt loading of 0.17 wt% (even in the presence of 0.005% SO2 and 10% vol H2O) and a 59-fold increase in turnover frequency compared to the control sample lacking this interfacial structure. CO oxidation; Pt/TiO2 catalyst; hydrogen reduction; oxygen vacancy; interfacial structure Junbo Tian Shuang Deng Yongjun Ji Wenxing Chen Ziyi Zhong Fabing Su RESTRICTED dataset Science Data Bank