Photocatalysts capable of utilizing full-spectrum solar energy for solar hydrogen evolution are highly appealing. Although graphene-based nanocomposites show certain photocatalytic characteristics due to its excellent conductivity, as a photothermal material, studies on its photothermal conversion effect have not been valued enough so far. Herein, reduced graphene oxide/TiO₂ (rGO/TiO₂) was synthesized for enhanced hydrogen evolution and photothermal conversion in the photocatalytic process. In our study, it was found that the 1.0 wt% reduced graphene oxide/TiO₂ shows optimal hydrogen evolution rate of 7.82 mmol g⁻¹ h⁻¹ under the full spectrum irradiation of the solar light. Especially, through the infrared imaging camera, the synergistic photothermal effect for the graphene-based nanocomposite was directly revealed in a non-contact way. The temperature index T_k, indicating the temperature ratio between the gas phase inside and the outside surface of the reactor, was found to be increased by 13.92% corresponding to a 38.11% enhancement of the hydrogen evolution rates. Overall, this study could propose a new access to the photothermal of a graphene-based nanocomposites for its high performance of photocatalysis and promoting their applications in the solar energy conversion.

能够利用全光谱太阳能来分解太阳能氢的光催化剂非常吸引人。尽管石墨烯基纳米复合材料由于其优异的导电性而显示出一定的光催化特性，但作为光热材料，到目前为止，对其光热转化效果的研究尚未得到足够的重视。在此，合成还原的氧化石墨烯/ TiO ₂（rGO / TiO ₂）以增强光催化过程中的氢释放和光热转化。在我们的研究中，发现1.0 wt％还原的氧化石墨烯/ TiO _2的最佳氢释放速率为7.82 mmol g ^-1  h ^-1在太阳光的全光谱照射下 特别地，通过红外成像相机，以非接触方式直接显示了基于石墨烯的纳米复合材料的协同光热效应。发现指示反应器内部和外部气相之间的温度比的温度指数T _k增加了13.92％，对应于氢释放速率提高了38.11％。总体而言，这项研究可以为石墨烯基纳米复合材料的光热性能提供新的途径，并促进其在太阳能转化中的应用。