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
2014 Bulletin of the Korean Chemical Society (Print)  
Sub-micrometer size gold particles were electrodeposited on a transparent fluorine-doped tin oxide (FTO) from acetonitrile solution containing AuCl 4 − and tetramethylammonium tetraflouroborate (TMATFB) for detecting NO 2 − . A series of two-electron (2e − ) and one-electron (1e − ) reductions of the AuCl 4 − -AuCl 2 − -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
more » ... −0.55 V (vs. Ag/Ag + ). The Au/FTO electrode exhibited sufficiently high catalytic activity toward the oxidation of NO 2 − 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 NO 2 − detection with excellent recoveries from real samples.
doi:10.5012/bkcs.2014.35.7.2072 fatcat:3kzgnyymhnezleozrvuqlsw3pu