Improved Photocurrent in Ru(2,2‘-bipyridine-4,4‘-dicarboxylic acid)₂(NCS)₂/Di(3-aminopropyl)viologen/Single-Walled Carbon Nanotubes/Indium Tin Oxide System: Suppression of Recombination Reaction by Use of Single-Walled Carbon Nanotubes

Abstract

This paper reported the use of single-walled carbon nanotubes (SWCNTs) with terminal carboxylic acid groups as an electron-transfer bridge layer for improved photocurrent of viologen/Ru complex-based photoelectrochemical cells. The preparation of SWCNTs on tin-doped indium oxide (ITO) was prepared by spray-coating. The formation of Ru(2,2‘-bipyridine-4,4‘-dicarboxylic acid)2(NCS)2 [(RuL2(NCS)2)]/di(3-aminopropyl)viologen (DPAV)/SWCNTs/ITO was prepared by formation of acid−base complex. RuL2(NCS)2/DAPV/ITO and RuL2(NCS)2/DAPV/SWCNTs/ITO showed photocurrents of 5.6 and 10.3 nA/cm2 under A.M 1.5 condition (I = 100 mW/cm2), respectively. The photocurrents of the RuL2(NCS)2/DAPV/SWCNTs/ITO cells in which Ru complexes were attached to carbon nanotubes by only acid−base complex formation were raised to 83.9% in comparison with RuL2(NCS)2/DAPV/ITO due to retardation of recombination reaction in photoelectrochemical cells.

Single walled carbon nanotube network electrodes for dye solar cells

“…Since they were first reported by Iijima in 1991 [1] single walled carbon nanotubes (SWCNTs) have attracted great interest across a diverse range of fields including microelectronics [2][3][4], medicine [5][6][7][8], energetic materials [9,10], polymers [11][12][13], energy storage [14,15] and more recently, light harvesting [16][17][18][19][20][21][22][23]. The use of SWCNTs in light harvesting devices has evolved primarily due to their unique electrical and optical properties arising as a result of one-dimensional (1D) confinement of electron and phonon states in the highly ordered SWCNT structure.…”

Photoelectrochemical properties of electrostatically self-assembled multilayer films formed by three bipolar hemicyanines and H4SiW12O40

“…The energy level of ITO electrode's conduction band, the reduction potentials of O 2 and EV 2+ , and the oxidation potential of ASA are around +0.3 [52], À0.26 [53], 0.011 [54] and +0.512 V vs. NHE [55], respectively. The ground-state hemicyanine was photoexcited by the light irradiation and then quickly converted into excited sate A 1* .…”

Electrochemical assembly of [Ru(bpy)2tatp]2+ associated with surfactants on the MWNTs/GC electrode

“…was interconnected on the multi-walled CNTs (MWNTs) for treating ammonia atmosphere or increasing their persistent photoconductivity [34,35]. Recently, single-walled carbon nanotubes (SWNTs) with terminal carboxylic acid groups were used as an electrontransfer bridge layer for improving photocurrent of viologen/Ru complex-based photoelectrochemical cells [36]. A ruthenium metallodendrimer was discovered to bind strongly and specifically to the SWNTs [37].…”