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A Novel Ruthenium-tungsten Bimetallic Complex
Dye-Sensitizer for
Photoelectrochemical Cells Application
(Kompleks Baru Dwilogam Rutenium-tungsten
Sebagai Bahan Pewarna Pemeka untuk Aplikasi Sel
Fotoelektrokimia)
KHUZAIMAH ARIFIN1, WAN RAMLI
WAN DAUD1& MOHAMMAD B.
KASSIM2*
1Fuel
Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor 2School
of Chemical Sciences and Food Technology, Faculty of Science and
Technology Universiti Kebangsaan
Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Diserahkan: 22
November 2012/Diterima: 9 April 2013
ABSTRACT
A novel bimetallic double
thiocyanate-bridged ruthenium and tungsten metal complex containing bipyridyl
and dithiolene co-ligands was synthesized and the behavior of the complex as a
dye-sensitizer for a photoelectrochemical (PEC)
cell for a direct water splitting reaction was investigated. The ligands and
metal complexes were characterized on the basis of elemental analysis as well
as UV-Vis, Fourier transform
infrared (FTIR) and nuclear magnetic
resonance (1H and 13C
NMR) spectroscopy. Cyclic voltammetry of the bimetallic complex showed multiple
redox couples, in which half potentials E1/2 at 0.625, 0.05 and 0.61V were
assigned as the formal redox processes of Ru(III)/Ru(II) reduction, W(IV)/W(V)
and W(V)/W(VI) oxidations, respectively. Photocurrent measurements were
performed in homogeneous system and TiO2 was
used as the photoanode for photocurrent measurements. Current density generated
by the bimetallic complex was higher than that of N3 commercial dye which
suggested that the bimetallic complex donated more electrons to the
semiconductor.
Keywords: Bimetallic; bipyridyl;
dithiolene; dye-sensitizer
ABSTRAK
Kompleks dwilogam baru dengan ligan
jejambat tiosianat berasaskan logam rutenium dan tungsten yang mengandungi
ko-ligan bipiridil dan ditiolena telah berjaya disintesis. Keupayaannya sebagai
bahan pewarna pemeka untuk kegunaan sel fotoelektrokimia (PEC)
bagi pembelahan molekul air secara terus juga telah dikaji. Ligan dan kompleks
logam telah dicirikan berdasarkan kaedah analisis mikro unsur CHNS;
spektroskopi infra-merah, ultralembayung-cahaya nampak, 1H
dan 13C NMR.
Analisis voltammetri berkitar menunjukkan kompleks dwilogam mempunyai beberapa
puncak redoks, antaranya adalah puncak redoks pada potensi separuh E1/2 - 0.625,
0.05 dan 0.61V yang merupakan keupayaan formal redoks bagi proses penurunan
Ru(III)/Ru(II) dan pengoksidaan W(IV)/W(V) dan W(V)/W(VI). Pengukuran fotoarus
dilakukan dalam sistem homogen dan TiO2 digunakan
sebagai fotoanod. Ketumpatan arus yang dihasilkan oleh kompleks dwilogam lebih
tinggi berbanding yang dihasilkan oleh bahan pemeka komersil N3 yang bermakna
elektron yang didermakan kompleks dwilogam lebih besar berbanding yang
didermakan oleh molekul N3.
Kata
kunci: Bahan pewarna pemeka; bipiridina; ditiolena; dwilogam
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*Corresponding author; email: mbkassim@ukm.my
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