Volume 27, Issue 7 p. 1707-1718
Full Paper

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

Sherilee Pillay

Sherilee Pillay

Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa.

Search for more papers by this author
Jeseelan Pillay

Corresponding Author

Jeseelan Pillay

Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, 200 Malibongwe Drive, Randburg 2125, South Africa tel: +27 11 709 4178, fax: +27 87 233 4511

Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, 200 Malibongwe Drive, Randburg 2125, South Africa tel: +27 11 709 4178, fax: +27 87 233 4511Search for more papers by this author
Paul M. Ejikeme

Paul M. Ejikeme

Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa.

Search for more papers by this author
Katlego Makgopa

Katlego Makgopa

Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa.

Search for more papers by this author
Kenneth I. Ozoemena

Kenneth I. Ozoemena

Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa.

Energy Materials, Materials Science and Manufacturing, Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa

Search for more papers by this author
First published: 13 April 2015
Citations: 4

Abstract

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 (15 mS cm−1), which is more than an order of magnitude greater than that of the MWCNT-SO3H (527 µS cm−1) and three orders of a magnitude greater than the nanoCoTCPc (4.33 µS cm−1). The heterogeneous electron transfer rate constant decreases as follows: nanoCoTCPc/MWCNT (kapp≈19.73×10−3 cm s−1)>MWCNT-SO3H (kapp≈11.63×10−3 cm s−1)>nanoCoTCPc (kapp≈1.09×10−3 cm s−1). The energy-storage capability was typical of pseudocapacitive behaviour; at a current density of 10 µA cm−2, the pseudocapacitance decreases as nanoCoTCPc/MWCNT (3.71×10−4 F cm−2)>nanoCoTCPc (2.57×10−4 F cm−2)>MWCNT-SO3H (2.28×10−4 F cm−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.