Highly Efficient Visible Light-Induced O2 Generation by Self-Assembled Nanohybrids of Inorganic Nanosheets and Polyoxometalate Nanoclusters

• DOI: 10.1038/srep02080
• Publication Date: 2013-06-26T09:03:33Z
• Authors: Jayavant L. Gunjakar; Tae Woo Kim; In Young Kim; Jang Mee Lee; Seong-Ju Hwang
• Keywords: nanotechnology; transmission electron microscopy; powder diffraction; 02 engineering and technology; 0210 nano-technology; 7. Clean energy; Article; inorganic compound

Unusually high photocatalytic activity of visible light-induced O(2) generation can be achieved by electrostatically-derived self-assembly between exfoliated Zn-Cr-LDH 2D nanosheets and POM 0D nanoclusters (W(7)O(24)(6−) and V(10)O(28)(6−)) acting as an electron acceptor. This self-assembly can provide a high flexibility in the control of the chemical composition and pore structure of the resulting LDH-based nanohybrids. The hybridization with POM nanoclusters remarkably enhances the photocatalytic activity of the pristine Zn-Cr-LDH, which is attributable to the formation of porous structure and depression of charge recombination. Of prime interest is that the excellent photocatalytic activity of the as-prepared Zn-Cr-LDH-POM nanohybrid for visible light-induced O(2) generation can be further enhanced by calcination at 200 °C, leading to the very high apparent quantum yield of ∼75.2% at 420 nm. The present findings clearly demonstrate that the self-assembly of LDH–POM is fairly powerful in synthesizing novel LDH-based porous nanohybrid photocatalyst for visible light-induced O(2) generation.