Electrode modification using nanocomposites of boron or nitrogen doped graphene oxide and cobalt (II) tetra aminophenoxy phthalocyanine nanoparticles

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• 作者：Munyaradzi Shumba ; Tebello Nyokong ; ^{t.nyokong@ru.ac.za" class="auth_mail" title="E-mail the corresponding author}
• 关键词：tetra aminophenoxy phthalocyanine ; graphene oxide nanosheets ; nitrogen doped ; boron doped ; hydrogen peroxide ; electrocatalysis
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 April 2016
• 年：2016
• 卷：196
• 期：Complete
• 页码：457-469
• 全文大小：3155 K

文摘

Reduced graphene oxide nanosheets (rGONS), reduced boron doped graphene oxide nanosheets (rBDGONS) and reduced nitrogen doped graphene oxide nanosheets (rNDGONS) and their composites with cobalt tetra aminophenoxy phthalocyanine nanoparticles (CoTAPhPctrong class="boldFont">NP)trong> were employed towards the detection of hydrogen peroxide. The nanomaterials were characterized by absorption spectroscopy, transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, linear sweep voltammetry and cyclic voltammetry. rNDGONS showed excellent electrooxidation and electroreduction of hydrogen peroxide supported by superior surface coverage values. The inclusion of nanosized Pc significantly lowered the reduction overpotential. CoTAPhPctrong class="boldFont">NPtrong>-rNDGONS-GCE gave a sensitivity of 39.30 mA/M, catalytic rate constant of 1 × 10³ M⁻¹ s⁻¹ and a detection limit of 8.2 nM. An adsorption equilibrium constant and Gibbs free energy of 1.26 × 10³ M⁻¹ and −17.69 kJ mol⁻¹ respectively were observed.