Zheng Minrou, Xu Qi, Tian Rui, Lu Chao
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
J Colloid Interface Sci. 2021 Oct 15;600:473-479. doi: 10.1016/j.jcis.2021.05.040. Epub 2021 May 11.
Two-dimensional photocatalytic materials have attracted great attention due to their large specific surface area and abundant active sites. Suppressing the recombination of photo-excited carriers is an effective approach to improve the performances of photocatalytic materials. Herein, we introduced ferroelectric PbTiO into the two-dimensional layered double hydroxides (LDHs) to improve the carrier separation efficiency and photocatalytic performances. A built-in electric field was generated in the polarized PbTiO, resulting in the improvement of the carrier separation efficiency and the promotion of the lifetime of photo-excited carriers in the LDHs-PbTiO composites. As a result, the LDHs-PbTiO composites showed the decent photocatalytic performances towards water splitting under visible light irradiation. The oxygen production rate of the proposed LDHs-PbTiO composites was almost twice than that of pristine LDHs. These results have addressed the significance of photo-excited carriers in photocatalytic materials. This approach could undoubtedly provide the valuable information in design and construction of high efficiency photocatalysts.
二维光催化材料因其大比表面积和丰富的活性位点而备受关注。抑制光激发载流子的复合是提高光催化材料性能的有效途径。在此，我们将铁电体PbTiO引入二维层状双氢氧化物（LDHs）中，以提高载流子分离效率和光催化性能。在极化的PbTiO中产生了内建电场，从而提高了LDHs-PbTiO复合材料中的载流子分离效率，并延长了光激发载流子的寿命。结果，LDHs-PbTiO复合材料在可见光照射下对水分解表现出良好的光催化性能。所制备的LDHs-PbTiO复合材料的产氧速率几乎是原始LDHs的两倍。这些结果揭示了光激发载流子在光催化材料中的重要性。这种方法无疑可以为高效光催化剂的设计和构建提供有价值的信息。
