The system 3, wherein {HEAD ~ the working electrode} is made of polyaniline or {TAIL ~ polypyrrole} 
is made of
The system 3 , wherein { HEAD ~ the working electrode } is made of polyaniline or { TAIL ~ polypyrrole }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL