Abstract
In this study, carbon nanotube (CNT) supported Pd catalysts at varying Pd molar ratios are prepared via NaBH4 reduction method. Catalysts prepared for hydrazine electrooxidation are characterized via N2 adsorption-desorption measurements (BET), X-ray photoelectron spectroscopy (XPS), and transmission electron microscope (TEM). Electrochemical measurements are performed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques by CHI660E potentiostat in a three-electrode system. According to the characterization results, Pd/CNT catalysts are successfully synthesized. For 5% Pd/CNT catalyst, the average particle size and the surface area determined as 5.17 nm and 773.10 m2 g-1 via TEM and BET, respectively. Between the Pd containing (0.1-20 wt %) CNT supported catalysts prepared, 5% Pd / CNT catalyst shows the best current density as 6.81 mA cm-2 (1122.63 mA mg-1 Pd). Furthermore, 5% Pd/CNT catalyst shows littlest charge transfer resistance (Rct) compared to Pd/CNT catalysts.
Highlights
The demand for energy, in which the vast majority of this demand is provided from fossil fuel is constantly increasing in the industrialized world [1, 2]
5% Pd/carbon nanotube (CNT) catalyst was characterized by BET, X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscope (TEM)
From the measurements taken at different potentials on 5% Pd/CNT catalyst at 0.4 V, we observed that this catalyst displayed the best catalytic activity in hydrazine electrooxidation reaction (Fig. 5a)
Summary
The demand for energy, in which the vast majority of this demand is provided from fossil fuel is constantly increasing in the industrialized world [1, 2]. Hydrazine is a preferable fuel due to its superior properties such as high energy density, low cost, zero CO2 emission, convenient storage, and transportation ease [10, 11]. Another feature of hydrazine is that its source (H2 and N2) is unlimited in nature. There are needs for low cost and more efficient catalysts with higher catalytic activity in hydrazine fuel cells. The electrochemical performances of prepared catalysts were investigated via CV and EIS These catalysts were characterized with advance surface characterization methods as XRD, XPS, and TEM to describe the surface chemical and physical properties. The particle size and the crystal structure of synthesized catalysts were determined via XRD and TEM
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