posted on 2024-02-15, 16:05authored byLei Wang, Xiaofeng Liu, Lingyun Wan, Yunzhi Gao, Xiaoning Wang, Jie Liu, Shijing Tan, Qing Guo, Wenhui Zhao, Wei Hu, Qunxiang Li, Jinlong Yang
Excitonic effects caused by the Coulomb
interaction between
electrons
and holes play a crucial role in photocatalysis at the molecule/metal
oxide interface. As an ideal model for investigating the excitonic
effect, coadsorption and photodissociation of water and methanol molecules
on titanium dioxide involve complex ground-state thermalcatalytic
and excited-state photocatalytic reaction processes. Herein, we systemically
investigate the excited-state electronic structures of the coadsorption
of H2O and CH3OH molecules on a rutile TiO2(110) surface by linear-response time-dependent density functional
theory calculations and probe the reaction path for generating HCOOH
or CO2, from ground-state and excited-state perspectives.
The reaction barriers in excited-state calculations are significantly
different from those in ground-state calculations during three processes,
with the largest decrease being 0.94 eV for the Ti5c–O–CH2–O–Ti5c formation process.