Nanostructured Cobalt(II) Tetracarboxyphthalocyanine Complex Supported Within the MWCNT Frameworks: Electron Transport and Charge Storage Capabilities

作者：Pillay Sherilee; Pillay Jeseelan^*; Ejikeme Paul M; Makgopa Katlego; Ozoemena Kenneth I

来源：Electroanalysis, 2015, 27(7): 1707-1718.

DOI：10.1002/elan.201500012

• Nanostructured cobalt phthalocyanine
• LBL-self assembly
• Electrochemistry
• Electron transfer kinetics
• Pseudocapacitor

The electrochemical redox properties of a surface-confined thin solid film of nanostructured cobalt(II) tetracarboxyphthalocyanine integrated with multiwalled carbon nanotube (nanoCoTCPc/MWCNT) have been investigated. This novel nanoCoTCPc/MWCNT material was characterized using SEM, TEM, zeta analysis and electrochemical methods. The nanoCoTCPc/MWCNT nanohybrid material exhibited an extra-ordinarily high conductivity (15mScm(-1)), which is more than an order of magnitude greater than that of the MWCNT-SO3H (527 mu Scm(-1)) and three orders of a magnitude greater than the nanoCoTCPc (4.33 mu Scm(-1)). The heterogeneous electron transfer rate constant decreases as follows: nanoCoTCPc/MWCNT (k(app)approximate to 19.73x10(-3)cms(-1))>MWCNT-SO3H (k(app)approximate to 11.63x10(-3)cms(-1))>nanoCoTCPc (k(app)approximate to 1.09x10(-3)cms(-1)). The energy-storage capability was typical of pseudocapacitive behaviour; at a current density of 10 mu Acm(-2), the pseudocapacitance decreases as nanoCoTCPc/MWCNT (3.71x10(-4)Fcm(-2))>nanoCoTCPc (2.57x10(-4)Fcm(-2))>MWCNT-SO3H (2.28x10(-4)Fcm(-2)). The new nanoCoTCPc/MWCNT nanohybrid material promises to serve as a potential material for the fabrication of thin film electrocatalysts or energy-storage devices.

• 出版日期2015-7