Electrocatalysis at chemically modified electrodes : Detection/determination of redox gaseous species in continuous-flow systems |
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Authors: | M Bonakdar Horacio A Mottola |
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Institution: | Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-0447 U.S.A. |
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Abstract: | The electrocatalytic response of chemically modified carbon paste and glassy carbon electrodes with anchored Fe(II)/Fe(III) centers is presented for gaseous species such as NO2, SO2, H2S, and Cl2. Carbon paste electrodes are modified by direct admixing of tris4,7-diphenyl-1,10-phenanthroline]iron(II) perchlorate, and glassy carbon electrodes are modified by oxidative electropolymerisation of tris5-amino-1,10-phenanthroline]iron(II) perchlorate. The electrocatalytic cycle operating in the integrated reaction/pre-electrode layer of chemically modified electrodes results in significant signal enhancement. Chemical modification of the conducting surfaces protects the electrode surface from poisoning. evaluation was done in a continuous-flow system using gravitational flow fo supporting electrolyte carrier propulsion, direct injection of air containing parts per billion or parts per million (v/v) of the gaseous species, and amperometric detection with the chemically modified electrodes as part of a thin-layer cell. |
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