Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1091-1096.doi: 10.1007/s40242-020-0302-0

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Application of Novel Calix[4]arene Metal-free Sensitizers in Dye-sensitized Photoelectrochemical Cells for Water Splitting

LUO Teng, HUANG Jianfeng, LIU Junmin   

  1. School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
  • Received:2020-09-29 Revised:2020-11-05 Online:2020-12-01 Published:2020-12-03
  • Contact: HUANG Jianfeng, LIU Junmin E-mail:huangjf39@mail.sysu.edu.cn;liujunm@mail.sysu.edu.cn
  • Supported by:
    Supported by the the National Natural Science Foundation of China(Nos.21572280, 21975291, and 61772053), the Natural Science Foundation of Guangdong Province, China(No.2019A1515011640) and the Fundamental Research Funds for the Central Universities of China(No.19lgpy12).

Abstract: A series of novel calix[4]arene metal-free dyes, featuring macrocyclic structure and unique conical conformation, has been introduced into photoanode-based dye-sensitized electrochemical cell system as photosensitizers. The electrochemical properties of the corresponding sensitized photoanodes were systematically studied in the absence/presence of water oxidation catalyst(WOC). Furthermore, the visible-light-driven overall water-splitting reactions were conducted by fully assembled devices, obtaining a performance trend of Calix-3 > Calix-2 > Calix-1. The corresponding device of Calix-3 exhibited the best photoactivity, giving an initial photocurrent density of ca. 300 μA/cm2, an IPEC peak value of ca. 9.0% at 365 nm and a wide photo-respond band up to ca. 620 nm. The best performance of Calix-3 can be attributed to its most effective light-harvesting ability, best ICT transition property, highest oxidation potential and thus best ability of activating WOC. This work offers an inspiration for the application of new-type effective metal-free sensitizers in photocatalytic water-splitting device.

Key words: Calixarene, Sensitizer, Water splitting, Solar fuel, Dye-sensitized photoelectrochemical cell