Sundar Dhivya, Liu Cheng-Hua, Anandan Sambandam, Wu Jerry J
Department of Environmental Engineering and Science, Feng Chia University, Taichung 407, Taiwan.
Department of Chemistry, National Institute of Technology, Trichy 620015, India.
Molecules. 2023 Jul 13;28(14):5383. doi: 10.3390/molecules28145383.
Carbon materials with elusive 0D, 1D, 2D, and 3D nanostructures and high surface area provide certain emerging applications in electrocatalytic and photocatalytic CO utilization. Since carbon possesses high electrical conductivity, it expels the photogenerated electrons from the catalytic surface and can tune the photocatalytic activity in the visible-light region. However, the photocatalytic efficiency of pristine carbon is comparatively low due to the high recombination of photogenerated carriers. Thus, supporting carbon materials, such as graphene, CNTs (Carbon nanotubes), g-CN, MWCNs (Multiwall carbon nanotubes), conducting polymers, and its other simpler forms like activated carbon, nanofibers, nanosheets, and nanoparticles, are usually combined with other metal and non-metal nanocomposites to increase the CO absorption and conversion. In addition, carbon-based materials with transition metals and organometallic complexes are also commonly used as photocatalysts for CO reduction. This review focuses on developing efficient carbon-based nanomaterials for the photoconversion of CO into solar fuels. It is concluded that MWCNs are one of the most used materials as supporting materials for CO reduction. Due to the multi-layered morphology, multiple reflections will occur within the layers, thus enhancing light harvesting. In particular, stacked nanostructured hollow sphere morphologies can also help the metal doping from corroding.
具有难以捉摸的零维、一维、二维和三维纳米结构以及高表面积的碳材料在电催化和光催化二氧化碳利用方面有某些新兴应用。由于碳具有高导电性，它能将光生电子从催化表面排出，并能在可见光区域调节光催化活性。然而，由于光生载流子的高复合率，原始碳的光催化效率相对较低。因此，负载型碳材料，如石墨烯、碳纳米管、石墨相氮化碳、多壁碳纳米管、导电聚合物及其其他更简单的形式，如活性炭、纳米纤维、纳米片和纳米颗粒，通常与其他金属和非金属纳米复合材料结合，以增加二氧化碳的吸收和转化。此外，含有过渡金属和有机金属配合物的碳基材料也常用于二氧化碳还原的光催化剂。本综述着重于开发用于将二氧化碳光转化为太阳能燃料的高效碳基纳米材料。得出的结论是，多壁碳纳米管是作为二氧化碳还原的负载材料最常用的材料之一。由于其多层形态，层内会发生多次反射，从而增强光捕获。特别是，堆叠的纳米结构空心球形态也有助于防止金属掺杂被腐蚀。
