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Title: | Porphyrin nanorods modified glassy carbon electrode for the electrocatalysis of dioxygen, methanol and hydrazine | Authors: | George, Reama C. Mugadza, Tawanda Khene, Samson Egharevba, Gabriel O. Nyokong, Tebello |
Keywords: | Porphyrin nanorods Methanol Hydrazine Dioxygen Electrocatalysis |
Issue Date: | 2011 | Publisher: | Wiley | Series/Report no.: | Electronalysis;Vol. 23. no. 7 | Abstract: | Porphyrin nanorods (PNR) were prepared by ionic self-assembly of two oppositely charged porphyrin molecules consisting of free base meso-tetraphenylsulfonate porphyrin (H4TPPS42−) and meso-tetra(N-methyl-4-pyridyl) porphyrin (MTMePyP4+M=Sn, Mn, In, Co). These consist of H4TPPS42− SnTMePyP4+, H4TPPS42− CoTMePyP4+, H4TPPS42− InTMePyP4+ and H4TPPS42− MnTMePyP4+ porphyrin nanorods. The absorption spectra and transmission electron microscopic (TEM) images of these structures were obtained. These porphyrin nanostructures were used to modify a glassy carbon electrode for the electrocatalytic reduction of oxygen, and the oxidation of hydrazine and methanol at low pH. The cyclic voltammogram of PNR-modified GCE in pH 2 buffer solution has five irreversible processes, two distinct reduction processes and three oxidation processes. The porphyrin nanorods modified GCE produce good responses especially towards oxygen reduction at −0.50 V vs. Ag|AgCl (3 M KCl). The process of electrocatalytic oxidation of methanol using PNR-modified GCE begins at 0.71 V vs. Ag|AgCl (3 M KCl). The electrochemical oxidation of hydrazine began at around 0.36 V on H4TPPS42− SnTMePyP4+ modified GCE. The GCE modified with H4TPPS42− CoTMePyP4+ H4TPPS42− InTMePyP4+ and H4TPPS42− MnTMePyP4+ porphyrin nanorods began oxidizing hydrazine at 0.54 V, 0.59 V and 0.56 V, respectively. | URI: | http://onlinelibrary.wiley.com.access.msu.ac.zw:2048/doi/10.1002/elan.201100081/abstract;jsessionid=9FAD865A7DA9466B07E1C7CD54DA9B84.f03t02?userIsAuthenticated=false&deniedAccessCustomisedMessage= | ISSN: | 1040-0397 |
Appears in Collections: | Research Papers |
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ABSTRACT Porphyrin Nanorods Modified Glassy.pdf | 373.61 kB | Adobe PDF | View/Open |
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