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⁺-V_o and electron-rich carbon defects. Once coupling with GO, joint function of Ti³⁺-V_o 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⁺-V_o 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 H₂.

剥落含钛的层状双氢氧化物（LDH）并通过静电组装方法与超薄石墨（GO）偶联，以制备用于可见光驱动的CO ₂还原的LDH / GO复合材料。主要重点是探索空位的类型和数量取决于光响应范围和产品分布。有趣的是，LDH / GO的催化行为随GO比率随火山曲线的增加而变化，其中5％GO / LDH表现出优异的效率和C1选择性。首先，LDH和GO分层导致结构不饱和配位，从而生成Ti ³⁺ -V _o和富电子碳缺陷。一旦与GO偶联，Ti ³⁺ -V _o的联合功能从C1s能级到价态导带能级的跃迁将吸收范围扩展到可见光。此外，富电子的碳缺陷主要促进了CO _2的吸附/活化。更重要的是，借助Ti ³⁺ -V _o和富电子的碳缺陷，在5GO / LDH上的反应过程中出现了HCO _3-和CO _2-的两个新的自由基，容易产生C1而不是H ₂。