Highly sensitive amperometric sensor for micromolar detection of trichloroacetic acid based on multiwalled carbon nanotubes and Fe(II)-phtalocyanine modified glassy carbon electrode

► Phthalocyanine (PC) and Fe(II) immobilized onto MWCNTs modified GC electrode. ► A pair of well-defined redox couple correspondent to (Fe(III)Pc/Fe(II)Pc) observed. ► Modified electrode shows excellent catalytic activity to electroreduction of CCl3COOH. ► Amperometry and cyclic voltammetry techniques were used for detection of CCl3COOH. ► Detection limit and sensitivity were 2.0 μM and 0.10 μA μM− 1 cm− 2, respectively.