This work reports the synthesis of rGO/TiO₂/Cu and rGO/TiO₂ nanocomposites to obtain methane and CO from CO₂ photoreduction with water vapour and simulated solar light. A novel, facile and efficient one-pot method is proposed to directly synthesize the composites in supercritical CO₂-ethanol medium. The influence of wt% rGO on both their physicochemical properties and photocatalytic activity have been studied. The most striking changes observed have been their large increase in the visible range absorbance and absorption thresholds as compared to commercial TiO₂, both effects increasing with the amount of rGO. These findings later resulted in an improved electron charge transfer and a better photocatalytic activity of the composite catalysts with higher rGO content. Nevertheless, the best catalytic performance (7.4 µmol CO₂/g TiO₂·h conversion rate) was achieved when the binary rGO/TiO₂ nanocomposite was doped with metallic Cu at 1 wt%, due to its better electron/hole separation as compared to rGO-TiO₂.

这项工作报告了rGO / TiO ₂ / Cu和rGO / TiO ₂纳米复合材料的合成，该合成方法是通过用水蒸气和模拟太阳光将CO _2光还原而获得甲烷和CO 。提出了一种新颖，简便，高效的一锅法，在超临界CO _2-乙醇介质中直接合成复合材料。研究了wt％rGO对其理化性质和光催化活性的影响。观察到的最显着变化是，与市售TiO ₂相比，它们在可见光范围内的吸光度和吸收阈值大幅增加，这两种效果都随着rGO数量的增加而增加。这些发现随后导致具有较高rGO含量的复合催化剂的电子电荷转移得到改善，并具有更好的光催化活性。尽管如此，当二元rGO / TiO ₂纳米复合材料掺有1 wt％的金属铜时，由于其更好的电子/空穴分离性，与之相比，仍具有最佳的催化性能（7.4 µmol CO ₂ / g TiO ₂ ·h转化率）。到rGO-TiO ₂。