光催化
甲烷化
石墨烯
材料科学
催化作用
光化学
载流子
可见光谱
离域电子
氧化物
电子迁移率
纳米技术
化学
光电子学
有机化学
冶金
生物化学
作者
Fazal Raziq,Mohammad Ziaur Rahman,Sharafat Ali,Roshan Ali,Sajjad Ali,Amir Zada,Xiaoqiang Wu,Jorge Gascón,Hongtao Wang,Liang Qiao
标识
DOI:10.1016/j.cej.2023.147712
摘要
This article reports Z-scheme photocatalytic CO2 methanation at the extended visible light (>500 nm) in absence of sacrificial electron donor/acceptor and noble metal cocatalysts. This Z-scheme photocatalyst consists of reduced graphene oxide (rGO) sandwiched between two different redox active photocatalysts (Ca-doped Bi2O3 and Cu2O). The rGO acts as a mediator by relaying electrons from Ca-doped Bi2O3 and holes from Cu2O that enables Z-scheme spatial confinement of electrons in Cu2O while holes in Ca-doped Bi2O3. This charge carrier delocalization enforces the enhanced oxidation strength of holes in Ca-doped Bi2O3 and reduction strength of electrons in Cu2O. As a result, it has exhibited methane (CH4) production rate under wider range of visible light (up to 700 nm) absorption. This Z-scheme photocatalyst therefore advents a new ‘600 nm-class photocatalyst’ for CO2 methanation. With the help of 13C isotopic measurements, first principles calculations and photoelectrochemical measurements, we have revealed the atomistic insight into the charge transport and surface catalytic reactions mechanisms to understand the rate limiting factors towards unassisted PCR.
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