Novel hybrid material of platinum (IV) nanocomplex-Carbon spheres: Synthesis, characterization, electrical conductivity and energy storage application

Abstract

The preparation of supercapacitor electrodes using hybrid materials based on noble metal complexes represents a promising advancement for various biomedical applications. In this research context, a new binuclear Pt(IV) nanocomplex with bis-[1-(2-[(2-hydroxynaphthalen-1-yl) methylidene]amino}ethyl)-1-ethyl-3-phenylthiourea] Schiff base (Pt-L) was prepared and characterized by elemental analysis, ESI-MS, NMR, FT-IR, UV-Visible, TGA measurements, TEM, and cyclic voltammetry (CV). The formed nanocomplex was adsorbed on a graphite/carbon spheres mixture to prepare the Gr/CSs-Pt-L hybrid material for supercapacitor electrodes. The obtained composite was characterized by FT-IR, TGA, SEM-EDX, XRD, and electrical conductivity. In addition, the electrochemical studies, such as cyclic voltammetry (CV), impedance spectroscopy, and charge-discharge, were investigated using Au/Gr/CSs-Pt-L as supercapacitor electrode.

The TEM results showed that the platinum complex was synthesized in nanometric form, and SEM-EDX showed that this nanocomplex was well adsorbed on the carbonaceous support (Gr/CSs₎. The electrical conductivity study showed that Gr/CSs/Pt-L exhibits low activation energy, indicating that this material has the best activity because the minimum amount of the activation energy is required to initiate a chemical reaction. The electrochemical studies revealed that the Au/Gr/CSs/Pt-L electrode exhibits excellent pseudo-capacitive behavior, with a specific capacitance of 5060 mF.g⁻¹, a high specific energy of 428 mWh.kg⁻¹ and a specific capacitance retention that reaches up to 99.09 % at 1 A.g⁻¹.