期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 270, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118878
关键词
CO2 photoconversion; Layered double hydroxide/graphene oxides composite; Ti3+-V-o; Carbon defect
资金
- National Natural Science Foundation [21576021]
- Fundamental Research Funds for the Central Universities [XK1802-6, buctrc201921, BHYC1701B]
- China Postdoctoral Science Foundation [2019M660416]
Ti-containing layered-double-hydroxide (LDH) was exfoliated and coupled with ultrathin graphite (GO) by electrostatic assembly method to fabricate LDH/GO composites for visible-light-driven reduction of CO2. Main focus was to explore the types and quantities of vacancies dependent light response range and product distribution. Interestingly, catalytic behavior of LDH/GO varied with GO ratio increasing as volcano curve, in which 5%GO/LDH exhibited superior efficiency and C1 selectivity. Primarily, delaminated LDH and GO led to structural unsaturated coordination, and thus generated Ti3+-Vo and electron-rich carbon defects. Once coupling with GO, joint function of Ti3+-Vo and transition from C1 s level to conduction band level of reduced valence states expanded absorption range to visible-light. Furthermore, adsorption/activation of CO2 was mainly promoted by electron-rich carbon defects. More importantly, with the aid of Ti3+-Vo and electron-rich carbon defects, two new radicals of HCO3- and CO2- appeared during reaction process over 5GO/LDH, prone to produce C1 rather than H-2.
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