A Novel CoO1.6C0.7 Nanocomposite with Enhanced Photocatalytic Activity and Stability for Hydrogen Evolution Achieved by Carbon Dots. Issue 3 (18th January 2018)

• Record Type: Journal Article
• Authors: Zhao, Juan; Liu, Chang'an; Wang, Huibo; Huang, Hui; Liu, Yang; Kang, Zhenhui
• Is Part Of: ChemistrySelect. Volume 3:Issue 3(2018)
• Page Start: 904
• Page End: 910
• Publication Date: 2018-01-18
• Subjects: Carbon dots -- CoO1.6C0.7 nanocomposite -- Enhanced photocatalytic activity and stability -- Hydrogen evolution; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201702644
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Utilizing semiconductor photocatalysts and solar energy for hydrogen evolution is an ideal way to solve the energy shortage and environmental pollution problem in the future. The CoO as photocatalyst with high solar‐to‐hydrogen efficiency has attracted wide attention, but its stability is low. Herein, we designed a disordered CoO1.6 C0.7 nanocomposite as photocatalyst, which exhibits improved photocatalytic activity and stability for hydrogen evolution without sacrificial reagent compared with that of CoO1.2 . By adding carbon dots (CDs) during the synthesis process, the obtained CoO1.6 C0.7 nanocomposite as photocatalyst could acquire the H2 evolution rate about 2.6 μmol h −1 under visible light (λ> 420 nm), while the H2 evolution rate increased to 18.0 μmol h −1 when used triethanolamine (TEOA) as sacrificial reagent. Moreover, the disordered CoO1.6 C0.7 photocatalyst displays excellent stability with more than 10 cycles. The improved photocatalytic activity and favorable stability of the disordered CoO1.6 C0.7 can be attributed to the addition of CDs, which enhanced the light absorption and accelerated electron transfer. Abstract : A disordered CoO1.6 C0.7 composite was synthesized using CDs and cobalt chloride as raw materials through a simple redox method under ambient conditions. The obtained CoO1.6 C0.7 photocatalyst demonstrates enhanced photocatalytic activity and stability for hydrogen evolution under visible light (λ>420 nm) without sacrificial reagents.