کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1300613 | 1498788 | 2010 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Metallophthalocyanine-based molecular materials as catalysts for electrochemical reactions
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کلمات کلیدی
Iron - آهنElectrocatalysis - الکتروتالیزModified electrodes - الکترود اصلاح شدهOxygène - اکسیژنVolcano plots - توطئه های آتشفشانThiol - تیول، مرکاپتانMetal phthalocyanine - فتالوسیانین فلزیPhenol - فنل Manganese - منگنز Nitrite - نیتریتNitric oxide - نیتریک اکسیدNickel - نیکلHydrazine - هیدرازین Hydroxylamine - هیدروکسیلامینCobalt - کبالت
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی معدنی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Metallophthalocyanines confined on the surface of electrodes are active catalysts for a large variety of electrochemical reactions and electrode surfaces modified by these complexes can be obtained by simple adsorption on graphite and carbon. However, more stable electrodes can be achieved by coating their surfaces with electropolymerized layers of the complexes, that show similar activity than their monomer counterparts. In all cases, fundamental studies carried out with adsorbed layers of these complexes have shown that the redox potential is a very good reactivity index for predicting the catalytic activity of the complexes. Volcano-shaped correlations have been found between the electrocatalytic activity (as log I at constant E) versus the Co(II)/(I) formal potential (E°â²) of Co-macrocyclics for the oxidation of several thiols, hydrazine and glucose. For the electroreduction of O2 only linear correlations between the electrocatalytic activity versus the M(III)/M(II) formal potential have been found using Cr, Mn, Fe and Co phthalocyanines but it is likely that these correlations are “incomplete volcano” correlations. The volcano correlations strongly suggest that E°â², the formal potential of the complex needs to be in a rather narrow potential window for achieving maximum activity, probably corresponding to surface coverages of an M-molecule adduct equal to 0.5 and to standard free energies of adsorption of the reacting molecule on the complex active site equal to zero. These results indicate that the catalytic activity of metallophthalocyanines for the oxidation of several molecules can be “tuned” by manipulating the E°Ⲡformal potential, using proper groups on the macrocyclic ligand. This review emphasizes once more that metallophthalocyanines are extremely versatile materials with many applications in electrocatalysis, electroanalysis, just to mention a few, and they provide very good models for testing their catalytic activity for several reactions. Even though the earlier applications of these complexes were focused on providing active materials for electroreduction of O2, for making active cathodes for fuel cells, the main trend in the literature nowadays is to use these complexes for making active electrodes for electrochemical sensors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Coordination Chemistry Reviews - Volume 254, Issues 23â24, December 2010, Pages 2755-2791
Journal: Coordination Chemistry Reviews - Volume 254, Issues 23â24, December 2010, Pages 2755-2791
نویسندگان
José H. Zagal, Sophie Griveau, J. Francisco Silva, Tebello Nyokong, Fethi Bedioui,