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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 7
BKCSDE 35(7)
July 20, 2014 

Electrodeposition of Gold on Fluorine-Doped Tin Oxide: Characterization and Application for Catalytic Oxidation of Nitrite
Md. Mahbubur Rahman, Xiao-Bo Li, Nasrin Siraj Lopa, Jae-Joon Lee*
Gold, Fluorine-doped tin oxide, Electrodeposition, Cyclic voltammetry, Nitrite oxidation
Sub-micrometer size gold particles were electrodeposited on a transparent fluorine-doped tin oxide (FTO) from acetonitrile solution containing AuCl4 − and tetramethylammonium tetraflouroborate (TMATFB) for detecting NO2 −. A series of two-electron (2e−) and one-electron (1e−) reductions of the AuCl4 −-AuCl2 −-Au redox systems were observed at FTO and a highly stable and homogeneous distribution of Au on FTO (Au/FTO) was obtained by stepping the potential from 0 to −0.55 V (vs. Ag/Ag+). The Au/FTO electrode exhibited sufficiently high catalytic activity toward the oxidation of NO2 − with a detection limit (S/N = 3) and sensitivity of 2.95 μM and 223.4 μA·cm−2·mM−1, respectively, under optimal conditions. It exhibited an interference-free signal for NO2 − detection with excellent recoveries from real samples.
2072 - 2076
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