Graphdiyne: A Metal-Free Material as Hole Transfer Layer To Fabricate Quantum Dot-Sensitized Photocathodes for Hydrogen Production

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• 作者：Jian Li ; Xin Gao ; Bin Liu ; Qingliang Feng ; Xu-Bing Li ; Mao-Yong Huang ; Zhongfan Liu ; Jin Zhang ; Chen-Ho Tung ; Li-Zhu Wu
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：138
• 期：12
• 页码：3954-3957
• 全文大小：327K
• ISSN：1520-5126

文摘

Graphdiyne (GDY), a novel large π-conjugated carbon material, for the first time, is introduced as the hole transfer layer into a photoelectrochemical water splitting cell (PEC). Raman and ultraviolet photoelectron spectroscopic studies indicate the existence of relatively strong π–π interactions between GDY and 4-mercaptopyridine surface-functionalized CdSe quantum dots, beneficial to the hole transportation and enhancement of the photocurrent performance. Upon exposure to a Xe lamp, the integrated photocathode produces a current density of nearly −70 μA cm^–2 at a potential of 0 V vs NHE in neutral aqueous solution. Simultaneously, the photocathode evolves H₂ with 90 ± 5% faradic efficiency over three times and exhibits good stability within 12 h. All of the results indicate that GDY is a promising hole transfer material to fabricate a PEC device for water splitting by solar energy.