摘要：CuS-graphene oxide/TiO2 composites were prepared using a sol-gel method to improve the photocatalytic performance of the photocatalyst. The composites were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, and transmission electron microscopy. The photocatalytic activities were examined by the degradation of methylene blue (MB) under visible-light irradiation. The photodegradation of MB under visible-light irradiation reached 90.1% after 120 min. The kinetics of MB degradation was plotted alongside the values calculated from the Langmuir-Hinshelwood equation. The CuS-graphene oxide/TiO2 sample prepared using 0.2 mol of TiO2 showed the best photocatalytic activity. This was attributed to a cooperative reaction as a result of increased photoabsorption by graphene oxide and an increased photocatalytic effect by CuS.

摘要：纳米结构催化材料被认为是各种能量转换和存储系统的有利设计理念。负载在氧化物载体上的纳米金属催化剂已被应用于燃料电池、气体传感器和化学重整装置等众多领域。然而,纳米金属催化剂经常存在耐久性问题。尽管表面修饰的纳米金属催化剂可以提供足够的催化活性,但其在恶劣的操作环境中的耐久性问题仍然存在。最近,原位出溶产生的纳米催化剂已被证明可以克服传统纳米金属催化剂的应用局限。出溶被定义为钙钛矿氧化物中具有催化活性的掺杂剂作为高度分散的纳米金属催化剂在其表面上出溶的过程。特别地,嵌入钙钛矿氧化物的出溶纳米催化剂比传统的纳米金属催化剂表现出更高的纳米颗粒密度和更强的抗烧结能力。本文概述了用于能源应用中出溶材料的最新进展,包括基本机制、主体氧化物的设计策略和实际应用。还讨论了这些材料的未来前景和进一步优化的途径。