Nanostructured Ce/CeO2-rGO: Highly Sensitive and Selective Electrochemical Hydrogen Sulfide (H2S) Sensor.

Autor: Mali, Shivsharan M., Narwade, Shankar S., Mulik, Balaji B., Sapner, Vijay S., Annadate, Shubham J., Sathe, Bhaskar R.
Zdroj: Electrocatalysis; Nov2023, Vol. 14 Issue 6, p857-868, 12p
Abstrakt: Herein, cerium/cerium oxide nanoparticles have been decorated on reduced graphene oxide (Ce/CeO2-rGO) for room temperature electrochemical determination of H2S in 0.5 M KOH. There is a superior linear correlation between the peak current density and H2S content in the tested range of 1–5 ppm. Moreover, comparison to other abundant gases such as CO2 shows no response at the potential of H2S oxidation, confirming no interference with H2S detection. It also reveals that the Ce/CeO2-rGO nanocomposite is a highly selective and sensitive system for the determination of H2S gas. Ce/CeO2-rGO synthesized by a simple chemical approach and further characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission-scanning electron microscopy (FE-SEM), coupled energy dispersive analysis of X-ray (EDAX), and BET-surface area measurement confirms the porosity of synthesized nanomaterials and homogeneous decoration of Ce/CeO2 nanoparticles on rGO sheets. The electrochemical studies, i.e., linear sweep voltammetry (LSV), of Ce/CeO2-rGO demonstrate the electrochemical H2S sensing at room temperature and for lower gas concentration (1 ppm) detection. The sensing mechanism is believed to be based on the modulation of the current and applied potential path across the electron exchange between the cerium oxide and rGO sites when exposed to H2S. One-pot synthesis of Ce/CeO2-GO hybrid nanostructure is of immense significance for H2S gas sensors. Here is a new superficial synthetic way intended for the synthesis of Ce/CeO2-GO nanocomposites through the sol–gel technique. Herein, we depict that the consequential Ce/CeO2 NPs decorated on graphene oxide sheet material can give competent electrocatalysts for the H2S oxidation reaction in an alkaline condition. The current density of 5.9 mA/cm2 on the tiny potential of 2.5 mV vs. SCE demonstrates huge catalytic bustle and stability. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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