Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - An in situ electrochemical quartz crystal microbalance study of polycrystalline gold electrodes in nitric acid solution
AU - Shackleford, Steven G. D.
AU - Boxall, C
AU - Port, Simon N.
AU - Taylor, Robin J.
PY - 2002/12/13
Y1 - 2002/12/13
N2 - The dissolution and redeposition processes of Au in HNO3 solution at pH 1 and 0 were investigated as a function of sweep rate by in situ EQCM experiments. The results demonstrate that, at pH 1 and vless than or equal to10 mV s(-1), An dissolves through a 3 e(-) oxidation at E > +1.0 V versus saturated calomel electrode (SCE), a process that, at vgreater than or equal to10 mV s(-1), is kinetically hindered with respect to upd of OH surface sublattices and subsequent 2-D-phase oxide formation. The inhibition arises from the presence of a close packed layer of nitrate oxyanions at the gold surface, although the layer is disrupted and the inhibition removed by the Au dissolution and reprecipitation processes that occur during potential cycling at low v. (C) 2002 Elsevier Science B.V. All rights reserved.
AB - The dissolution and redeposition processes of Au in HNO3 solution at pH 1 and 0 were investigated as a function of sweep rate by in situ EQCM experiments. The results demonstrate that, at pH 1 and vless than or equal to10 mV s(-1), An dissolves through a 3 e(-) oxidation at E > +1.0 V versus saturated calomel electrode (SCE), a process that, at vgreater than or equal to10 mV s(-1), is kinetically hindered with respect to upd of OH surface sublattices and subsequent 2-D-phase oxide formation. The inhibition arises from the presence of a close packed layer of nitrate oxyanions at the gold surface, although the layer is disrupted and the inhibition removed by the Au dissolution and reprecipitation processes that occur during potential cycling at low v. (C) 2002 Elsevier Science B.V. All rights reserved.
KW - EQCM
KW - gold dissolution
KW - gold oxdation
KW - gold-nitrate system
KW - SCANNING-TUNNELING-MICROSCOPY
KW - ELECTROCATALYTIC BEHAVIOR
KW - CYCLIC VOLTAMMETRY
KW - SULFURIC-ACID
KW - OXIDE-FILMS
KW - ANODIC BEHAVIOR
KW - PERCHLORIC-ACID
KW - DOUBLE-LAYER
KW - IN-SITU
KW - MONOLAYER THICKNESS
U2 - 10.1016/S0022-0728(02)01218-4
DO - 10.1016/S0022-0728(02)01218-4
M3 - Journal article
VL - 538-539
SP - 109
EP - 119
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0022-0728
ER -