Abstract
It is well-known that platinum (Pt) is still the preferred material of anode catalyst in ethanol oxidation, however, the prohibitive high cost and CO poisoning of Pt metal impede the commercialization of fuel cells. Therefore, improving the utilization rate of catalysts and reduce the cost of catalyst become one of the most concerned focus in the construction of fuel cells. In this work, the Pt-based catalysts are synthesized by using different content of sodium dodecyl sulfate (SDS) modified-Ti3C2Tx support, and the dispersion regulation function of SDS modified-Ti3C2Tx supported on Pt nanoparticles is investigated. The structure, composition and morphology of different catalysts are characterized by X-ray diffraction (XRD), X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and high-resolution TEM, respectively. It is found that the Pt nanoparticles in pure Ti3C2Tx surface are serious aggregated and show poor dispersion, whereas the Pt nanoparticles in SDS modified-Ti3C2Tx have a better dispersion. The electrochemical results revealed that SDS modified-Ti3C2Tx supported Pt nanoparticles has higher electrocatalytic activity and stability in both acidic and alkaline ethanol oxidation when the dosage of SDS increases to 100 mg. These findings indicate that the SDS-Ti3C2Tx/Pt catalysts show a promising future of potential applications in fuel cells with modification of Ti3C2Tx support.
Highlights
With the continuous energy consumption and population growth, energy crisis has been a big problem of the world
It is found that the electrocatalytic activity of the Pt-loaded Ti3 C2 Tx catalyst in ethanol oxidation is greatly improved by the functional modification of Ti3 C2 Tx, which is beneficial to catalyze the oxidation of the COads intermediate product on the electrode surface
The multilayer Ti3 C2 Tx is modified with sodium dodecyl sulfate (SDS) and sonicated into SDSmodified Ti3 C2 Tx support, and the Pt nanoparticles is deposited on the SDS-modified
Summary
With the continuous energy consumption and population growth, energy crisis has been a big problem of the world. Pure platinum catalyst is still expensive and can be poisoned by the intermediates from alcohol oxidation, limiting its commercial application in DEFC [11,12,13,14,15] To resolve this problem, a more effective way is to explore a suitable catalyst carrier where the Pt nanoparticles can be uniformly dispersed and be well stabilized for a high catalytic efficiency. Wang et al prepared the PDDA-functionalized MXene as carrier for the uniform dispersed Au nanoparticles through the adsorption of positively charged PDDA and MXene surface functional groups, which exhibited good catalytic performance in the electrochemical detection of sodium nitrite [24] Among these investigated surfactants, the sodium dodecyl sulfate (SDS) was found to improve the solubilization of carbon-based carries based on noncovalent interactions of SDS and carries surface. It is found that the electrocatalytic activity of the Pt-loaded Ti3 C2 Tx catalyst in ethanol oxidation is greatly improved by the functional modification of Ti3 C2 Tx , which is beneficial to catalyze the oxidation of the COads intermediate product on the electrode surface
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