Graphdiyne/CdSe quantum dot heterostructure for efficient photoelectrochemical water oxidation. (18th October 2021)

• Record Type: Journal Article
• Authors: Luan, Xiaoyu; Zheng, Zhiqiang; Wang, Zhongqiang; Gao, Yaqi; Zhao, Shuya; Xue, Yurui; Li, Yuliang
• Is Part Of: 2D materials. Volume 8:Number 4(2021)
• Publication Date: 2021-10-18
• Subjects: graphdiyne -- two-dimensional material -- quantum dots -- heterostructure -- water oxidation; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/ac2a73
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: The design and synthesis of efficient catalysts for water oxidation is of significant importance. Here a type of graphdiyne (GDY) based heterostructure of CdSe/GDY was synthesized through a facile in-situ growth strategy including the first growth of GDY nanosheet arrays followed by the nucleation and growth of CdSe quantum dots (QDs) featuring well-dispersed CdSe QDs with uniform size around 3 nm. Experimental results revealed that GDY could effectively induce the growth and well-dispersion of CdSe QDs on GDY, forming new heterostructures and leading to the maximized number of active sites, the reduced recombination of photo-induced electron and hole pairs, and facilitated charge transfer behavior. Benefiting from these superior advantages, CdSe/GDY achieves greatly enhanced catalytic activity toward water oxidation under light illumination, with a small overpotential of 155 mV at the current density of 10 mA cm −2, which is better than those of pristine CdSe QDs and GDY.