Abstract
Nanocrystalline platinum with different morphologies is synthesized via electrochemical deposition technique. The nucleation mechanism and its structural effect over the electrodeposited Pt on carbon electrodes have been systematically studied. Powder X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy are employed to study nucleation, oxidation states, and Pt structure growth on a carbon electrode. This study reports significant development of Pt metal nanoparticles with different morphologies such as a sphere, flower, core-flower, and rod-like structure directly fabricated on carbon electrode while tuning the deposition parameters such as current density, time, temperature, pH during the deposition process. The proposed electrochemical route represents a superior fabrication procedure for large-scale electrode fabrication compared to a conventional method for preparing membrane electrode assemblies for fuel cell stacks.
Highlights
Fabrication and surface engineering of platinum metal nanoparticles with different morphology and crystal-face has been the focus of many recent studies due to the broad class and most promising applications such as polymer electrolyte fuel cell [1,2], industrial synthesis of ammonia [3], electrochemical oxidation of ethanol and methanol [4,5,6], glucose detection [7], carbon monoxide gas sensors [8], petroleum refining [9], hydrogen production and anticancer drugs [10,11]
The rate per unit of the surface area of metal is customarily dependent on the crystalline size, morphology, and crystalline plane orientation generally referred to as structure-sensitive responses [12]
One-step synthesis of Pt nanoparticles of various morphologies via electrochemical deposition was performed on a conductive carbon substrate in the present study
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The preparation of metal particles with well-controlled size and shapes are more important for catalytic applications. In the present study, different Pt metal particle morphology is explored via electrochemical deposition. One-step synthesis of Pt nanoparticles of various morphologies via electrochemical deposition was performed on a conductive carbon substrate in the present study. As far as we are aware, this is the first-ever report on the simultaneous direct fabrication of sphere, flower-, and core-flower-shaped Pt metal with (111) facets orientation on a larger active area substrate of 35 cm by electrochemical deposition. Scheme 1 illustrates Pt metal nanostructure directly deposited on carbon substrate using one-step electrochemical deposition technique and its expected surface morphology while varying current density, time, temperature, and pH.
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