Photoreduction of CO₂ into fuel molecules such as CH₄ represents a promising route to simultaneously explore renewable energy and alleviate global warming. However, the implementation of such a process is hampered by low product yields and poor selectivity. A 2D/2D heterojunction of ultrathin SiC and reduced graphene oxide (RGO) nanosheets was fabricated in situ for efficient and selective photoreduction of CO₂. Ultrathin SiC suppresses significant charge recombination in the bulk phase, thus providing more energetic electrons. The robust 2D/2D heterojunction allows fast transfer of energetic electrons from SiC to RGO. Combining the vital role of RGO in facilitating CO₂ activation, the optimized SiC/RGO exhibits an electron‐transfer rate of 58.17 μmol h⁻¹ g⁻¹ towards CO₂ reduction, 2.7 times that of pure SiC (20.25 μmol h⁻¹ g⁻¹). About 92 % of the transferred electrons from SiC are devoted to generating CH₄ (6.72 μmol h⁻¹ g⁻¹). Such high efficiency and selectivity are mainly a result of the densely accumulated energetic electrons within RGO, which facilitate the eight‐electron process to produce CH₄. This work will inspire the design of catalyst/cocatalyst systems for efficient and selective photoreduction of CO₂.

中文翻译：

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超薄SiC /还原石墨烯氧化物纳米片的原位制造2D / 2D异质结，可实现高CH4选择性的高效CO2光还原

将CO ₂光还原为燃料分子（例如CH _4）代表了同时探索可再生能源和缓解全球变暖的有前途的途径。然而，这种方法的实施由于产物产率低和选择性差而受到阻碍。原位制备了超薄SiC和还原氧化石墨烯（RGO）纳米片的2D / 2D异质结，以实现CO _2的高效选择性光还原。超薄SiC可抑制体相中的显着电荷复合，从而提供更多的高能电子。强大的2D / 2D异质结允许将高能电子从SiC快速转移到RGO。结合RGO在促进CO _2中的重要作用活化后，优化的SiC / RGO对CO ₂还原的电子转移速率为58.17μmolh ^-1  g ^-1，是纯SiC（20.25μmolh ^-1  g ^-1）的2.7倍。来自SiC的约92％的转移电子专用于生成CH ₄（6.72μmolh ^-1  g ^-1）。如此高的效率和选择性主要是由于RGO内高能电子的密集积累，它促进了八电子过程产生CH _4的过程。这项工作将启发催化剂/助催化剂系统的设计，以实现有效和选择性的CO _2光还原。