Abstract
In this work, two new dyes YK-1 and YK-2 with carboxylic acid and hydroxamic acid as anchoring groups, respectively, in combination with diphenylamine as donor and perylenemonoimide as acceptor were synthesized and applied in p-type dye-sensitized solar cells (p-DSCs) and dye-sensitized photoelectrochemical cells (PEC). The results showed that the sensitizer (YK-1) based on carboxylic acid displayed a higher conversion efficiency of 0.064% under AM 1.5 solar conditions in p-DSCs. However, it was interesting that the hydroxamic acid based sensitizer (YK-2) on NiO photocathode displayed better performance in a hydrophilic environment over a broad pH range under visible-light irradiation because of a versatile covalent attachment to NiO surfaces. This may be ascribed to hydroxamic acid anchors, which have more sites interacting with the surface of NiO in aqueous solution. This study demonstrates that YK-2 containing hydroxamic acid anchoring group is a promising candidate to achieve highly efficient and stable activity for dye-sensitized PEC system.
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