Shape-Controlled Synthesis of Concave Pt and Willow-Like Pt Nanocatalysts via Electrodeposition with Hydrogen Adsorption/Desorption and Investigation of Their Electrocatalytic Performances toward Ethanol Oxidation Reaction

Abstract

Without introducing any surfactants and capping agents, concave Pt nanocubes, willow-like Pt nanocrystals, and spherical Pt nanoparticles were synthesized at different deposition potentials using a square-wave potential electrodeposition procedure. As the deposition potentials decreased from the double layer region to the hydrogen underpotential deposition region and finally into the hydrogen evolution reaction region under acidic conditions, the morphology of Pt nanocrystals changed from spherical Pt nanoparticles to willow-like Pt nanocrystals and finally to concave Pt nanocubes. We took advantage of the unique features of hydrogen adsorption/desorption on the surface of Pt in different potential regions to achieve the shape-controlled synthesis of Pt nanocrystals, and the different degrees of interaction between hydrogen and Pt played a key role in obtaining nanocrystals with various shapes. Concave Pt nanocubes exhibited excellent electrocatalytic activity to the ethanol oxidation reaction, as compared to commercial Pt/C catalysts. The peak current density in the positive scan of concave Pt nanocubes was 2.3 mA cm–2, which was 4.7 times higher than that of commercial Pt/C.

Newly Found Photoactivated Pt Anchored on Three-Dimensional Layered WS2/Carbon Cloth for Highly Efficient Ethylene Glycol Electro-Oxidation

“…Accordingly, different commercial electrodes such as Pt/C, Pt/CC, and Pt-WS 2 /CC were investigated by CVs from −0.2 to 1.2 V (Figure ). It can be seen that all CV profiles of the samples showed a pair of typical hydrogen adsorption/desorption peaks in the range of −0.2 to 0.1 V. , The ECSA has been obtained by calculating the adsorption/desorption region of hydrogen by eq where S H is the hydrogen absorption/desorption area, V is the sweep speed, and M Pt is the loading of Pt electrodeposited on the electrode.…”

Review on Low‐Cost Counter Electrode Materials for Dye‐Sensitized Solar Cells: Effective Strategy to Improve Photovoltaic Performance

“…In some examples, nanomaterial with exposed special fact can be controllably synthesized by using one or more kind's surfactants, which selected adsorption on the special planes and then changed the inherent growth direction. [98][99][100] Then these nanomaterials can be employed as catalysts in the catalytic field, such as photocatalytic, [101][102][103] water splitting, [104,105] electrooxidation, [106,107] and DSSCs. [108,109] So, it is reasonable to expect the low-cost metal chalcogenides with special facets can deliver satisfactory performance.…”

Electro‐Catalytic Oxidation of Methanol Catalyzed by Facet‐Controlled Pt‐WC Nanoparticles on In Situ Synthesized Carbon Nanotubes

“…Various wet chemical methods have been developed for the facet‐controlled synthesis of Pt‐based nanoparticles (NPs) [22–25] . However, most of the synthesis methods require the use of organic or inorganic capping agents, [22–24] which may introduce heterogeneous impurities and contaminate the surface of Pt NPs, thus reducing their multi‐functional activity and limiting their commercial availability [26] . Therefore, developing a simple, clean and mass‐produced method to control the preferential growth of Pt specific crystal plane is tremendously indispensable [27] …”