1. Facile synthesis of 2D Bi4O5Br2/2D thin layer-Ti3C2 for improved visible-light photocatalytic hydrogen evolution.
- Author
-
Xi, Qing, Yue, Xiuping, Feng, Junqiang, Liu, Jianxin, Zhang, Xiaochao, Zhang, Changming, Wang, Yawen, Wang, Yunfang, Lv, Zhiping, Li, Rui, and Fan, Caimei
- Subjects
- *
HYDROGEN evolution reactions , *CHARGE exchange , *SOLAR energy conversion , *CHARGE transfer , *CHARGE carriers , *HYDROGEN - Abstract
Photocatalytic hydrogen evolution via water splitting was considered as a promising way of solar energy conversion and storage in the past decades. However, the weak visible-light response and fast recombination of electron-hole pairs are still main obstacles to overcome. Herein, a novel 2D/2D Bi 4 O 5 Br 2 /TL-Ti 3 C 2 (Thin layer-Ti 3 C 2) visible-light photocatalyst was successfully prepared by in-situ synthesis of Bi 4 O 5 Br 2 nanosheets on the surface of TL-Ti 3 C 2 at room temperature. The resulting Bi 4 O 5 Br 2 /TL-Ti 3 C 2 exhibits a higher hydrogen evolution activity (83.5 μmol·g−1·h−1) than that of pristine Bi 4 O 5 Br 2 (44.9 μmol·g−1·h−1) under visible-light irradiation. The enhanced hydrogen evolution activity of as-prepared photocatalyst mainly attributes to the increased visible light responsiveness and rapid transfer of photo-induced electrons. The strong interaction between TL-Ti 3 C 2 and Bi3+ in Bi 4 O 5 Br 2 nanosheets establishes a good electron transfer channel and close contact, which accelerates the transfer of photo-induced electrons from Bi 4 O 5 Br 2 to Ti 3 C 2 and promotes the separation of photo-generated charge carriers, thereby increasing the number of effective photo-induced electrons involved in the hydrogen evolution. This work provides a new insight into the construction of Bi x O y Br z /MXene photocatalyst system, and demonstrated that Ti 3 C 2 has excellent application potential in promoting the photocatalytic performance of bismuth-rich bismuth oxyhalides (Bi x O y X z X = Cl, Br, I). Benefiting from the rapidly transfers photo-induced electrons and increases the visible light responsiveness, the resulting 2D Bi 4 O 5 Br 2 /2D TL-Ti 3 C 2 manifests more significant photocatalytic hydrogen evolution activity (83.5 μmol·g−1·h−1) than that of pristine Bi 4 O 5 Br 2 (44.9 μmol·g−1·h−1). This work provides a new insight into the construction of Bi x O y Br z /MXene photocatalyst system, and demonstrated that Ti 3 C 2 has excellent application potential in promoting the photocatalytic performance of bismuth-rich bismuth oxyhalides (Bi x O y X z X = Cl, Br, I). Image 1 • Bi 4 O 5 Br 2 /Thin layer-Ti 3 C 2 was prepared by in-situ synthesis at room temperature. • Bi 4 O 5 Br 2 /Thin layer-Ti 3 C 2 manifests better photocatalytic H 2 evolution than Bi 4 O 5 Br 2. • The enhanced activity was mainly attributed to the rapidly charge transfer. • An electron transfer channel was established in Bi 4 O 5 Br 2 /Thin layer-Ti 3 C 2. • The possible H 2 evolution mechanism of Bi 4 O 5 Br 2 /Thin layer-Ti 3 C 2 was proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF