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Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties
Author(s) -
Chai Dongfeng,
Hou Yan,
O'Halloran Kevin P.,
Pang Haijun,
Ma Huiyuan,
Wang Guangning,
Wang Xinming
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801081
Subject(s) - polyoxometalate , pseudocapacitor , supercapacitor , capacitance , chemistry , benzene , materials science , electrode , organic chemistry , catalysis
To enhance energy storage performance via modulation of crystal structure on the molecular level, two series of triethylamine (TEA)‐dependent polyoxometalate (POM) based inorganic‐organic hybrid compounds, [Cu II (btx) 2 ] 2 [SiW 12 O 40 ] ( SiW ‐ 1 ), [Cu I (btx)] 4 [SiW 12 O 40 ] ( SiW ‐ 2 ), [Cu I 4 (btx) 3 ][SiW 12 O 40 ] ⋅ 2H 2 O ( SiW ‐ 3 ), [{Cu II 6 (btx) 7 (H 2 O) 12 }H 4 ⊂(W 12 O 40 ) 2 ] ⋅ 12H 2 O ( W ‐ 1 ), [{Cu II 7 (btx) 8 (H 2 O) 10 }H 2 ⊂(W 12 O 40 ) 2 ] ⋅ 2H 2 O ( W ‐ 2 ) and [{Cu II 10 Cu I 2 (btx) 11 (H 2 O) 16 }H 2 ⊂(W 12 O 40 ) 3 ] ⋅ 6H 2 O ( W ‐ 3 ) (btx=1,4‐bis(triazol‐1‐ylmethyl)benzene) have been synthesized and explored as pseudocapacitor electrode materials. Compared to other compounds, SiW ‐ 2 shows a specific capacitance of 110.3 F g −1 at 3.0 A g −1 and only experiences a capacitance loss of 13 % after 1000 cycles at a current density of 18.0 A g −1 . More importantly, the two series of compounds can be considered as a model for studying the effects of the molecular structures on the pseudocapacitor performance. The result verifies that besides the type of POM, the capacitance ability of the POM‐based compounds is mainly dominated by the connecting modes of adjacent POM building blocks and the dimension of covalent networks formed by POM building blocks. Thus, this work may open a new avenue to optimize the performance of POM‐based capacitors.