Hu Songwei, Shi Jinwen, Luo Bing, Ai Chaoqian, Jing Dengwei
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
J Colloid Interface Sci. 2022 Feb 15;608(Pt 2):2058-2065. doi: 10.1016/j.jcis.2021.10.136. Epub 2021 Oct 28.
Reduced graphene oxide (rGO) has conspicuous photothermal characteristics in photothermal applications. Thus in our previous work, we used reduced graphene oxide (rGO) supported titanium dioxide (TiO) nanocomposite (rGO/TiO) to absorb the ultraviolet and infrared light in the photothermal hydrogen evolution process. In order to make use of the full spectrum solar energy into other clear energy, the visible light should be also considered in following research. Herein, we report a cuprous oxide (CuO) decorated reduced graphene oxide (rGO) supported titanium dioxide (TiO) (CuO-rGO/TiO) catalysts, which can absorb full spectrum solar light in an innovative way. The CuO-rGO/TiO catalyst is synthesized through a one-step hydrothermal method. The rates of hydrogen evolution are 17800 μmol·gh under photothermal condition (90°C), 3800 μmol·gh under photocatalysis condition only (25°C) and 0 μmol·gh under thermal catalysis condition only. The result of photothermal catalytic hydrogen evolution rate is about 4.7 times that of the sum of the photocatalytic and thermal reactions. The photothermal synergetic effect promotes the photo-generated electron-holes separation through the rGO due to the temperature rising, and accelerates the reaction rates on the catalyst surface in hydrogen evolution process simultaneously. This work could provide us a new promising way for the conversion of full spectrum solar energy to hydrogen energy.
还原氧化石墨烯（rGO）在光热应用中具有显著的光热特性。因此，在我们之前的工作中，我们使用还原氧化石墨烯（rGO）负载二氧化钛（TiO）纳米复合材料（rGO/TiO）在光热析氢过程中吸收紫外光和红外光。为了将全光谱太阳能转化为其他清洁能源，在后续研究中还应考虑可见光。在此，我们报道了一种氧化亚铜（CuO）修饰的还原氧化石墨烯（rGO）负载二氧化钛（TiO）（CuO-rGO/TiO）催化剂，它能够以一种创新的方式吸收全光谱太阳光。CuO-rGO/TiO催化剂通过一步水热法合成。在光热条件（90°C）下析氢速率为17800 μmol·g⁻¹h⁻¹，仅在光催化条件（25°C）下为3800 μmol·g⁻¹h⁻¹，仅在热催化条件下为0 μmol·g⁻¹h⁻¹。光热催化析氢速率的结果约为光催化和热催化反应速率之和的4.7倍。光热协同效应由于温度升高促进了光生电子 - 空穴通过rGO分离，同时在析氢过程中加速了催化剂表面的反应速率。这项工作可为全光谱太阳能向氢能的转化提供一种新的有前景的途径。
