Two-Dimensional Morphology Enhances Light-Driven H2 Generation Efficiency in CdS Nanoplatelet-Pt Heterostructures

• DOI: 10.1021/jacs.8b06100
• Publication Date: 2018-08-27T04:34:31Z
• Authors: Qiuyang Li; Fengjiao Zhao; Chen Qu; Qiongyi Shang; Zihao Xu; Li Yu; James R. McBride; Tianquan Lian
• Keywords: Nanorod; Quantum Efficiency; Nanomaterials; Charge carrier

Light-driven H2 generation using semiconductor nanocrystal heterostructures has attracted intense recent interest because of the ability to rationally improve their performance by tailoring size, composition, and morphology. In zero- one-dimensional nanomaterials, lifetime photoinduced charge-separated state is still too short for evolution reaction, limiting solar-to-H2 conversion efficiency. Here we report that two-dimensional (2D) CdS nanoplatelet (NPL)-Pt heterostructures, internal quantum efficiency (IQE) can exceed 40% at pH 8.8–13 approach unity 14.7. The near IQE 14.7 similar those reported 1D nanorods be attributed irreversible hole removal OH–. At < 13, 2D NPL-Pt significantly higher than in nanorods. Detailed time-resolved spectroscopic studies modeling elementary charge separation recombination processes show that, compared nanorods, morphology extends may play a dominant role enhancing This work provides new designing nanostructures efficient light-driven generation.