Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Novel Bifunctional Electrocatalyst for ORR Activity and Methyl Parathion Detection Based on Reduced Graphene Oxide/Palladium Tetraphenylporphyrin Nanocomposite

Novel Bifunctional Electrocatalyst for ORR Activity and Methyl Parathion Detection Based on Reduced Graphene Oxide/Palladium Tetraphenylporphyrin Nanocomposite
Te-Wei Chiu, Shen-Ming Chen, Subbiramaniyan Kubendhiran, Subramanian Sakthinathan, Chelladurai Karuppiah
We introduce a facile, eco-friendly reduced graphene oxide/palladium tetraphenylporphyrin (RGO/Pd–TPP) nanocomposite for oxygen reduction reaction (ORR) and environmental pollutant detection. The catalytic properties of RGO/Pd–TPP toward ORR and methyl parathion (MP) reduction showed excellent performance due to the synergism between RGO and Pd–TPP. The other properties of RGO/Pd–TPP nanocomposite were characterized by various microscopic and spectroscopic techniques. The as-prepared RGO/Pd–TPP electrocatalyst was further fabricated on electrode to study the ORR activity and MP sensing. The RGO/Pd–TPP modified electrode shows higher current density and less methanol tolerance than the Pt/C electrode, which revealed that the proposed material can be used as an excellent alternative to commercial Pt/C electrode. In addition, the electrocatalytic reduction of MP on RGO/Pd–TPP/GCE was briefly investigated and achieved a good analytical performance with excellent linear range (0.1–125 μM), low detection limit (7.4 nM), and higher sensitivity (4.1084 μA μM–1 cm–2). Besides, the modified electrode has successfully applied for the determination of MP insecticide in various water and food samples. Therefore, the finding of RGO/Pd–TPP nanocomposite can be regarded as an effective catalyst to enhance the electrocatalytic activity toward ORR and MP reduction.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b01941

DOI: 10.1021/acs.jpcc.7b01941

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