Article

Ion transport through a porphyrin-terminated hybrid bilayer membrane

College of Chemistry and Materials Science, Anhui Normal University, 1# Beijing East Rd, Wuhu 241000, Anhui, China; Institute of Biomaterial, College of Science, South China Agricultural University, Guangzhou 510642, China
Electrochimica Acta DOI:10.1016/j.electacta.2010.10.040 pp.1076-1081

ABSTRACT A hybrid bilayer membrane (HBM) has been prepared on a glassy carbon electrode (GCE). The HBM consists of an inner layer of n-hexadecylamine (HDA) covalently attached at the GCE and an out-layer of tetra-(N-hexadecylpyridiniurnyl)porphyrin (TC16PyP). The HDA was covalently bounded on the carbon surfaces through its primary amine under cyclic voltammetric potential scans forming a self-assembled monolayer (SAM). The TC16PyP forms a second layer on top of the HDA layer due to hydrophobic interaction. The TC16PyP/HDA/GCE assembly has been utilized to study ion transport through hybrid bilayer membranes. The ion transport through this porphyrin-terminated HBM has been found to strongly dependent on pH. It allows negatively charged redox ions, Fe(CN)63−, to penetrate at pH <6 while repelling positively charged Ru(NH3)63+. However, no faradaic current has been detected at pH >6 with either ions. We believe that electrostatic interaction between the redox ions and the charged membrane is the main reason for this pH dependent ion transport.

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Keywords

charged membrane
 
cyclic voltammetric potential scans
 
dependent
 
faradaic current
 
glassy carbon electrode
 
HDA
 
HDA layer
 
hybrid bilayer membrane
 
hybrid bilayer membranes
 
hydrophobic interaction
 
inner layer
 
ion transport
 
main reason
 
pH dependent ion transport
 
redox ions
 
self-assembled monolayer
 
study ion transport
 
TC16PyP/HDA/GCE assembly
 
tetra-(N-hexadecylpyridiniurnyl)porphyrin