Surfactant-Free Monodispersed Pd Nanoparticles Template for Core-Shell Pd@PdPt Nanoparticles as Electrocatalyst towards Methanol Oxidation Reaction (MOR)

Abstract

An eco-friendly two-step synthetic method for synthesizing Pd@PdPt/CNTs nanoparticles was introduced and studied for the methanol oxidation reaction. The Pd@PdPt alloy core-shell structure was synthesized by preparing a surfactant-free monodispersed Pd/CNTs precursor through the hydrolysis of tetrachloropalladate (II) ion ([PdCl4]2−) in the presence of carbon nanotubes (CNTs) and the subsequent hydrogen reduction and followed by a galvanic replacement reaction. This method opens up an eco-friendly, practical, and straightforward route for synthesizing monometallic or bimetallic nanoparticles with a clean surfactant-free electrocatalytic surface. It is quite promising for large-scale preparation. The Pd@PdPt/CNTs electrocatalyst demonstrated a high specific mass activity for methanol oxidation (400.2 mAmgPt−1) and excellent stability towards direct methanol oxidation compared to its monometallic counterparts.

Surfactant-free synthesis of metal and metal oxide nanomaterials: a perspective

“…28 For instance, Pd@PdPt/carbon nanotube nanocomposites have been synthesized using a surfactant-free technique in which the core–shell structures of the Pd@PdPt alloy were prepared through surfactant-free monodisperse Pd/carbon nanotube precursors by hydrolysis of tetrachloropalladate( ii ) ions ([PdCl 4 ] 2− ) in the presence of carbon nanotubes. 89 After that, the hydrogen reduction was accomplished followed by a galvanic replacement reaction. These nanocomposites with surfactant-free electrocatalytic surfaces were deployed for the methanol oxidation reaction, providing electrocatalysts with excellent electrochemical performances and high stability towards methanol oxidation compared to their monometallic counterparts.…”

“…These nanocomposites with surfactant-free electrocatalytic surfaces were deployed for the methanol oxidation reaction, providing electrocatalysts with excellent electrochemical performances and high stability towards methanol oxidation compared to their monometallic counterparts. 89 In addition, the hierarchical dahlia-like TiO 2 /V 2 O 5 composites were synthesized using a facile one-pot surfactant-free strategy. 90 These nanocomposites with considerable recyclability (∼5 cycles) exhibited efficient adsorption towards methylene blue owing to physical and electrostatic interactions, offering promising candidates for the removal of organic pollutants in wastewater.…”

Strain-Induced Porous Pd@PdPt Core/Shell Nanocubes as Effective All-in-One Electrocatalysts toward Multialcohol Oxidation

“…Recently, the synthesis of Pd@PdPt nanocatalysts also attracted great attention. 46 For example, Pd@PdPt nanowires (NWs) were prepared via a galvanic displacement reaction between the asprepared Pd NWs and platinum salt. 47 The electrocatalytic activity toward formate oxidation shows a significant improvement of 98.2 A m −2 compared to Pd NWs and commercial Pt catalysts.…”

“…That is, the electrochemical performances of Pt-based NCs are tunable via controlling the geometric factor of the core/shell structure, such as the morphology and the composition of the shell. Recently, the synthesis of Pd@PdPt nanocatalysts also attracted great attention . For example, Pd@PdPt nanowires (NWs) were prepared via a galvanic displacement reaction between the as-prepared Pd NWs and platinum salt .…”

Pd3Co1 Alloy Nanocluster on the MWCNT Catalyst for Efficient Formic Acid Electro-Oxidation

“…Palladium (Pd) has a good catalytic performance for DFAFC [ 11 , 12 , 13 , 14 ]. Various Pd-based bimetallic alloy catalysts (e.g., PdCu [ 15 ], PdMn [ 16 ], PdW [ 17 ], PdCO [ 18 ], PdIr [ 19 ], PdSn [ 20 ], PdNi [ 21 ]) have been prepared to improve the inert FAOR because these alloys exhibited the ability to get rid of OH species.…”