Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, Zhejiang, P.R. China.
Zhejiang Institute of Optoelectronics, Zhejiang Normal University, Jinhua 321004, Zhejiang, P.R. China; Zhejiang Provincial Key Laboratory of Solid State Optoelectronic Devicces, Zhejiang Normal University, Jinhua 321004, Zhejiang, P.R. China.
J Colloid Interface Sci. 2023 Aug;643:174-182. doi: 10.1016/j.jcis.2023.04.015. Epub 2023 Apr 7.
Aerogels, especially MXene aerogels, are an ideal multifunctional platform for developing efficient photocatalysts for CO reduction because they are featured by abundant catalytic sites, high electrical conductivity, high gas absorption ability and self-supported structure. However, the pristine MXene aerogel has almost no ability to utilize light, which requires additional photosensitizers to assist it in achieving efficient light harvesting. Herein, we immobilized colloidal CsPbBr nanocrystals (NCs) onto the self-supported TiCT (where T represents surface terminations such as fluorine, oxygen, and hydroxyl groups) MXene aerogels for photocatalytic CO reduction. The resultant CsPbBr/TiCT MXene aerogels exhibit a remarkable photocatalytic activity toward CO reduction with total electron consumption rate of 112.6 μmol gh, which is 6.6-fold higher than that of the pristine CsPbBr NC powders. The improvement of the photocatalytic performance is presumably attributed to the strong light absorption, effective charge separation and CO adsorption in the CsPbBr/TiCT MXene aerogels. This work presents an effective perovskite-based photocatalyst in aerogel form and opens a new avenue for their solar-to-fuel conversions.
气凝胶，特别是 MXene 气凝胶，是开发高效 CO 还原光催化剂的理想多功能平台，因为它们具有丰富的催化位点、高导电性、高气体吸收能力和自支撑结构。然而，原始的 MXene 气凝胶几乎没有利用光的能力，这需要额外的光敏剂来帮助它实现高效的光捕获。在此，我们将胶体 CsPbBr 纳米晶体（NCs）固定在自支撑 TiCT（其中 T 代表表面末端，如氟、氧和羟基）MXene 气凝胶上，用于光催化 CO 还原。所得的 CsPbBr/TiCT MXene 气凝胶在 CO 还原方面表现出显著的光催化活性，总电子消耗速率为 112.6 μmol g h，比原始 CsPbBr NC 粉末高 6.6 倍。光催化性能的提高可能归因于 CsPbBr/TiCT MXene 气凝胶中的强光吸收、有效的电荷分离和 CO 吸附。这项工作提出了一种有效的基于钙钛矿的气凝胶形式的光催化剂，并为它们的太阳能到燃料的转化开辟了新的途径。
