As a “kill two birds with one stone” approach, photocatalytic CO2 reduction to solar fuels can save supplying energy and simultaneously protect our environment. Specifically, the use of CO2 as the starting carbon source can help with the required emission cuts. Meanwhile, it directly generates short-chain hydrocarbon products such as CH4, CH3OH, C2H6 and so on, which can serve as a renewable energy source (solar fuels) to alleviate increasingly tense energy crisis. Two-dimensional (2D) nanomaterials possess several extraordinary advantages, including large surface-to-volume ratio, abundant active sites, atomic thickness, high fraction of coordinated unsaturated surface sites, endowing them with promising candidates for high photocatalytic activity of CO2 reduction. This review summarizes a series of typical 2D nanomaterials for photocatalytic CO2 conversion, such as graphene-based photocatalysts, graphitic carbon nitride-based photocatalysts, 2D metal oxide-based photocatalysts, 2D metal halcogenide-based photocatalysts, 2D metal oxyhalide-based photocatalysts, and layered double hydroxides-based photocatalysts. Furthermore, based on the characteristics of 2D materials and the current status of research on photocatalytic CO2 reduction, the challenges and opportunities of 2D materials as prospective photocatalyst for CO2 reduction will also be discussed.

中文翻译：

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二维纳米材料用于光催化二氧化碳还原为太阳能

作为“用一只石头杀死两只鸟”的方法，将光催化二氧化碳还原为太阳能可以节省能源供应，同时保护我们的环境。具体而言，使用CO2作为起始碳源可以帮助减少所需的排放量。同时，它直接产生CH4，CH3OH，C2H6等短链烃产物，可作为可再生能源（太阳能），以缓解日益紧张的能源危机。二维（2D）纳米材料具有许多非凡的优点，包括大的表面体积比，丰富的活性位点，原子厚度，高比例的不饱和配位表面位点，使其具有高的CO2还原光催化活性。这篇综述总结了一系列用于光催化CO2转化的典型2D纳米材料，例如基于石墨烯的光催化剂，基于石墨氮化碳的光催化剂，基于2D金属氧化物的光催化剂，基于2D金属卤化物的光催化剂，基于2D金属卤氧化物的光催化剂，以及层状双氢氧化物基光催化剂。此外，根据二维材料的特点和光催化还原CO 2的研究现状，还将探讨二维材料作为光催化还原CO 2的挑战和机遇。以及层状双氢氧化物基光催化剂。此外，根据二维材料的特点和光催化还原CO 2的研究现状，还将探讨二维材料作为光催化还原CO 2的挑战和机遇。以及层状双氢氧化物基光催化剂。此外，根据二维材料的特点和光催化还原CO 2的研究现状，还将探讨二维材料作为光催化还原CO 2的挑战和机遇。