Facile synthesis of electrochemically active Pt nanoparticle decorated carbon nano onions

Abstract

Well dispersed platinum nanoparticles 1-5 nm (average 2 nm) in diameter on carbon nano onions (CNOs) are accessible using a simple and scalable one-step batch method. This technique involves pretreatment of acid digested CNOs with H 2 PtCl 6 prior to reduction using hydrogen at ambient conditions, with the composite material being electrochemically active. The effect of different Pt loading, surface treatment, and the processing temperature on the dispersion of platinum nanoparticles on the CNOs has been studied in detail.

Carbon Nano‐Onions: A Review of Recent Progress in Synthesis and Applications

“…The CNO/Pt composite was also prepared using plasma‐treated CNOs, H 2 PtCl 6 as a Pt source and ascorbic acid as a reducing agent. In the literature, we found other reports concerning the preparation of composites containing Pt and CNOs with different distributions of metal nanoparticles (from 40 to 100 wt% Pt), which show interesting catalytic properties . An interesting method of preparing CNO/Pt was proposed by Santiago and coworkers, which was accomplished using a rotating disk‐slurry electrode technique .…”

“…For this reason, new catalysts with higher stability are required. CNOs decorated with inorganic nanoparticles showed promising electrocatalytic properties . Pristine or doped CNOs were also applied as catalysts during the exothermic oxidative dehydrogenation of ethylenebenzene to styrene,, and epoxidation reactions ,,.…”

“…In the literature, we found other reports concerning the preparation of composites containing Pt and CNOs with different distributions of metal nanoparticles (from 40 to 100 wt% Pt), which show interesting catalytic properties. [123][124][125] An interesting method of preparing CNO/Pt was proposed by Santiago and coworkers, which was accomplished using a rotating disk-slurry electrode technique. [125] The CNO/Pt material was prepared from slurries that contained functionalized CNOs and K 2 PtCl 6 as the platinum precursor in aqueous 0.1 M H 2 SO 4 solution.…”

“…CNOs decorated with inorganic nanoparticles showed promising electrocatalytic properties. [123] Pristine or doped CNOs were also applied as catalysts during the exothermic oxidative dehydrogenation of ethylenebenzene to styrene, [13,187] and epoxidation reactions. [143,188,189] Boron-and phosphorus-doped CNOs were also used as catalysts for ORR and organic compounds.…”

Effect of Sn Doping on Pd Electro-Catalysts for Enhanced Electro-Catalytic Activity towards Methanol and Ethanol Electro-Oxidation in Direct Alcohol Fuel Cells

“…However, the corrosion of carbon supports in acid or alkaline conditions leads to the aggregation and leaching of Pd metal; hence, the activity of the catalyst decreases as a result of corrosion [ 14 ]. To avoid these fundamental issues, carbon nano-onions (CNOs)—zero-dimensional carbon with high porous structure and excellent electrical conductivity—have been used as support for electro-catalysts [ 15 ].…”