Doping-enhanced electrical conductivity and electrocatalytic activity in cobalt phthalocyanine

1989 ◽  
Vol 8 (8) ◽  
pp. 969-970 ◽  
Author(s):  
P. S. Harikumar ◽  
V. N. Sivasankara Pillai
Keyword(s):  
Electrical Conductivity ◽  
Electrocatalytic Activity ◽  
Cobalt Phthalocyanine

Surface electrochemistry of N,N',N″,N‴-tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt(II)

2006 ◽  
Vol 10 (10) ◽  
pp. 1238-1248 ◽  
Author(s):  
Junsheng Chen ◽  
Jiujun Zhang ◽  
Yu-Hong Tse ◽  
Pavel Janda ◽  
Dharamdat Christendat ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Electrocatalytic Activity ◽  
Positive Charge ◽  
Graphite Electrode ◽  
Cobalt Phthalocyanine ◽  
Central Metal ◽  
Spontaneous Reduction ◽  
Surface Electrochemistry ◽  
Peroxide Reduction ◽  
Concerted Processes

The complex N,N',N″,N‴ -tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt(II) ([ Co II TMPz [4+])4+ adsorbed on a graphite electrode undergoes spontaneous reduction, forming a surface containing Co I. Five reversible surface peaks are observed at low pH, two of which are two-electron concerted processes. At high pH, one of these two-electron processes splits into two one-electron waves. Both oxidation and reduction of the central metal can be observed, along with successive reduction steps involving the porphyrazine ligand. Notable is the marked shift to positive potentials of these processes, relative to unsubstituted cobalt phthalocyanine, due to the positive charge localized on the porphyrazine. The electrocatalytic activity of this complex modified electrode toward the reduction of hydrogen peroxide is also reported. We demonstrate that a series of different surfaces exist which are obtained by variation of pH and polarization potential and that these surfaces possess differing electrocatalytic activity. Surfaces inactive to hydrogen peroxide can exist at potentials more negative than active surfaces even though the driving force for peroxide reduction will be greater for the former.

Synthesis, aggregation, electrocatalytic activity, and redox properties of a tetranuclear cobalt phthalocyanine

1987 ◽  
Vol 26 (6) ◽  
pp. 891-899 ◽  
Author(s):  
W. A. Nevin ◽  
W. Liu ◽  
S. Greenberg ◽  
M. R. Hempstead ◽  
S. M. Marcuccio ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Redox Properties ◽  
Cobalt Phthalocyanine

Biotemplated synthesis of bark-structured TiC nanowires as Pt catalyst supports with enhanced electrocatalytic activity and durability for methanol oxidation

2014 ◽  
Vol 2 (21) ◽  
pp. 8003-8008 ◽  
Author(s):  
Zhen Qiu ◽  
Hui Huang ◽  
Jun Du ◽  
Xinyong Tao ◽  
Yang Xia ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Electrochemical Stability ◽  
Pt Catalyst ◽  
Catalyst Supports ◽  
High Electrical Conductivity ◽  
One Dimensional ◽  
Electrocatalytic Properties ◽  
Excellent Chemical

Unique one-dimensional bark-structured TiC NWs possessing high electrical conductivity, excellent chemical/electrochemical stability and enhanced electrocatalytic properties were synthesised.

Carbon Nanotubes-Supported Pt Electrocatalysts for O2 Reduction Reaction—Effect of Number of Nanotube Walls

2020 ◽  
Vol 20 (5) ◽  
pp. 2736-2745 ◽  
Author(s):  
Haohua Kuang ◽  
Yi Cheng ◽  
Cheng Qiang Cui ◽  
San Ping Jiang
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Electrocatalytic Activity ◽  
Supported Catalysts ◽  
Polymer Electrolyte Membrane ◽  
Pt Nanoparticles ◽  
Outer Wall ◽  
Reduction Reaction ◽  
O2 Reduction ◽  
Walled Cnts

Carbon nanotubes (CNTs) are one of the most common catalysts supports for the development of electrocatalysts for O2 reduction reaction (ORR) of electrochemical devices such as polymer electrolyte membrane fuel cells (PEMFCs) and metal-air batteries due to their high electrical conductivity and high stability. In addition to the electrical conductivity and stability, the number of inner tubes or walls also influence the electrocatalytic activity of the supported catalysts. Here we study the electrocatalytic activity of Pt nanoparticles (NPs) supported on CNTs (Pt/CNTs) as a function of number of walls towards ORR in both alkaline and acid solutions. The results indicate that the mechanism of ORR on Pt/CNTs does not change with the number of walls of CNTs support but the number of walls of CNTs supports has a significant effect on the electrocatalytic activity of supported Pt NPs. Pt NPs supported on double-walled CNTs (DWCNTs) exhibit a much better activity for ORR, as compared with that supported on single-walled and multi-walled CNTs (SWCNTs and MWCNTs). The high electrocatalytic activity of DWCNTs-supported Pt NPs is contributed to the fast electron transfer between the outer wall and inner tubes of DWCNTs for ORR through electron tunnelling process under the electrochemical polarization driving force.

Nanostructured cobalt phthalocyanine single-walled carbon nanotube platform: electron transport and electrocatalytic activity on epinephrine

2008 ◽  
Vol 12 (12) ◽  
pp. 1289-1299 ◽  
Author(s):  
Bolade O. Agboola ◽  
Alfred Mocheko ◽  
Jeseelan Pillay ◽  
Kenneth I. Ozoemena
Keyword(s):  
Carbon Nanotubes ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Pyrolytic Graphite ◽  
Single Walled Carbon Nanotubes ◽  
Cobalt Phthalocyanine ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The fabrication, characterization and application of edge-plane pyrolytic graphite electrode modified with acid-functionalized single-walled carbon nanotubes, nanostructured cobalt phthalocyanine and a mixture of both, towards epinephrine detection and analysis are described. The morphological features of the films were evaluated using atomic force microscopy (AFM). Electrochemistry of these electrodes in [ Fe ( CN )6]3−/4− using cyclic voltammetry and electrochemical impedance spectroscopy showed higher peak current responses with accompanying low electron-transfer resistances in comparison to the bare electrode. The edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode exhibited good electrocatalytic activity towards epinephrine oxidation with enhanced peak currents. Analytical studies using edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode proved that the electrode is suitable for sensitivity determination of epinephrine in pH 5 conditions judging from the good sensitivity (8.71 ± 0.31 A.M−1), and limit of detection (0.04 µM) and quantification (1.31 µM) obtained. Determination of EP in the absence and presence of ascorbic acid in phosphate buffer pH 5 conditions was carried out and it was established that the presence of AA did not interfere in EP analysis. Rotating disk electrode experiments proved that the catalytic rate constant was 2.28 × 1016 mM−1.s−1.

ChemInform Abstract: Synthesis, Aggregation, Electrocatalytic Activity, and Redox Properties of a Tetranuclear Cobalt Phthalocyanine.

ChemInform ◽  
1987 ◽  
Vol 18 (31) ◽  
Author(s):  
W. A. NEVIN ◽  
W. LIU ◽  
S. GREENBERG ◽  
M. R. HEMPSTEAD ◽  
S. M. MARCUCCIO ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Redox Properties ◽  
Cobalt Phthalocyanine

Comparative study of the electrocatalytic activity of cobalt phthalocyanine and cobalt naphthalocyanine for the reduction of oxygen and the oxidation of hydrazine

1998 ◽  
Vol 43 (12-13) ◽  
pp. 1821-1827 ◽  
Author(s):  
M. Isaacs ◽  
M.J. Aguirre ◽  
A. Toro-Labbé ◽  
J. Costamagna ◽  
M. Páez ◽  
...  
Keyword(s):  
Comparative Study ◽  
Electrocatalytic Activity ◽  
Cobalt Phthalocyanine
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