Title : Electrocatalytic enhancement of oxalic acid oxidation using platinum/carbon black-nickel-reduced graphene oxide on screen-printed carbon electrode
The platinum/carbon black-nickel-reduced graphene oxide (Pt/CB-Ni-rGO) nanocomposites were prepared by reduction method. Graphene oxide (GO) support was synthesized from natural graphite powder using a modified Hummer’s method. Then, nickel ions were reacted with surface functional groups of GO via an ionic adsorption process at pH 11. The carbon black was decorated into this nanocomposite to obtain the CB-Ni-GO nanocomposite. Reduction of platinum by ethylene glycol produced Pt/CB-Ni-GO catalysts. Their morphology and chemical component were characterized by scanning electron microscopy (SEM) and energy dispersive and X-ray (EDX), respectively. The results clearly demonstrated the achievement in Pt/CB-Ni-rGO nanocomposite formation. The spectrum of EDX confirmed the presence of exclusively carbon (C), oxygen (O), nickel (Ni) and platinum (Pt), which indicated the success of the composite formation with a high purity. Moreover, the deposition and distribution of Pt nanoparticles on CB-NirGO was investigated by transmission electron microscopy (TEM). The nano-sized particles (2.89±0.54 nm) of Pt were excellently loaded on CB-Ni-rGO. The cyclic voltammetry (CV) technique was applied to investigate the electrocatalytic activity of the Pt/CB-Ni-rGO on electrode. It was indicated that appropriate amount of Pt could enhance the catalytic activity of Pt for oxalic acid electro-oxidation. In addition, different metal loaded on CB-Ni-rGO were also investigated. The result showed that the oxidation peak current of oxalic acid on Pt/CB-Ni-rGO modified screen-printed carbon electrode was highest and occurred at lowest potential among Ag/CB-Ni-rGO, Au/CB-Ni-rGO and Pd/CB-Ni-rGO. The linearity and limit of detection were found in the range of 20-60,000 µM and at 2.35 µM, respectively.
Audience Take Away:
- Synthesis of the platinum/carbon black-nickel-reduced graphene oxide nanocomposites.
- Characterization of the platinum/carbon black-nickel-reduced graphene oxide nanocomposites.
- Application for oxalic acid electrochemical analysis using the platinum/carbon black-nickel-reduced graphene oxide nanocomposites.