An unprecedented fully reduced {MoV60} polyoxometalate: from an all-inorganic molecular light-absorber model to improved photoelectronic performance. Issue 16 (1st April 2022)

• Record Type: Journal Article
• Authors: Li, Xue-Xin; Ji, Tuo; Gao, Jun-Yang; Chen, Wei-Chao; Yuan, Ye; Sha, Hao-Yan; Faller, Roland; Shan, Guo-Gang; Shao, Kui-Zhan; Wang, Xin-Long; Su, Zhong-Min
• Is Part Of: Chemical science. Volume 13:Issue 16(2022)
• Page Start: 4573
• Page End: 4580
• Publication Date: 2022-04-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1sc06779f
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : An unprecedented fully reduced {Mo V 60 } POM served as a cheap and robust molecular light-absorber model possessing wide light absorption and was applied to build a co-sensitized solar cell photoelectronic device. Abstract : Fully reduced polyoxometalates are predicted to give rise to a broad and strong absorption spectrum, suitable energy levels, and unparalleled electronic and optical properties. However, they are not available to date. Here, an unprecedented fully reduced polyoxomolybdate cluster, namely Na8 [Mo V 60 O140 (OH)28 ]·19H2 O {Mo V 60 }, was successfully designed and obtained under hydrothermal conditions, which is rare and is the largest fully reduced polyoxometalate reported so far. The Mo V 60 molecule describes one Keggin {ε-Mo12 } encapsulated in an unprecedented {Mo24 } cage, giving rise to a double truncated tetrahedron quasi-nesting architecture, which is further face-capped by another four {Mo6 } tripods. Its crystalline stability in air, solvent tolerance, and photosensitivity were all shown. As a cheap and robust molecular light-absorber model possessing wide light absorption, Mo V 60 was applied to build a co-sensitized solar cell photoelectronic device along with N719 dyes and the optimal power conversion efficiency was 28% higher than that of single-dye sensitization. These results show that Mo V 60 polyoxometalate could serve as an ideal model for the design and synthesis of all-inorganic molecular light-absorbers for other light-driven processes in the future.