Enhancement of Activity of PtRu Nanoparticles Towards Oxidation of Ethanol by Supporting on Poly(diallyldimethylammonium)-Functionalized Carbon Nanotubes and Modification with Phosphomolybdate

Abstract

A new concept of fabrication, immobilization, and distribution of bimetallic PtRu nanoparticles leading to enhancement of the electrocatalytic oxidation of ethanol is proposed. The approach utilizes poly (diallyldimethylammonium chloride), PDDA, to functionalize multi-walled carbon nanotubes (MWCNTs) and to produce a novel support for synthesized PtRu nanoparticles as well as further modification of the catalytic surfaces with ultra-thin layers of phosphododecamolybdate (PMo 12 O 40 3− ). Remarkable increases of electrocatalytic currents measured under voltammetric and chronoamperometric conditions have been observed.Parallel experiments performed with use of commercial PtRu nanoparticles confirm existence of enhancement effects originating from application of PDDA-modified MWCNTs and phosphomolybdate.

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

“…The improvement of catalytic activities of systems containing molybdenum and tungsten oxide for CO electrooxidation was also confirmed by theoretical studies [40,41]. When it comes to oxidation of ethanol, modification of PtSn nanoparticles with polymolybdates or polytungstates [9,[42][43][44], with tungsten oxide [10] or molybdenum oxide [31], has also resulted in the enhancement of the system's electrocatalytic properties.…”

Characterization of High-Temperature Proton-Exchange Membranes Based on Phosphotungstic Acid Functionalized Mesoporous Silica Nanocomposites for Fuel Cells

“…The highest stability and strongest acidity is observed for phosphotungstic acid (H 3 PW 12 O 40 , abbreviated as HPW or PWA). Because of their high acidity, stability, and high proton conductivity, HPAs have been used as additives to promote the electrocatalytic activities of electrocatalysts for methanol oxidation, − ethanol oxidation, , and oxygen reduction. − However, the application of HPAs as proton-exchange membranes in fuel cells is limited because of the sensitivity of their conductivity to the relative humidity of the surrounding environment in addition to their solubility in water. The risk of the leakage of HPAs during cell operation is thus high.…”

Polyoxometalates (POMs): from electroactive clusters to energy materials

“…This is one of the main conclusions extracted from the past research in the field as the POM improve the crystal size homogeneity and decrease the size. The second conclusion is that POMs improve the catalyst stability by preventing the surface poisoning with by-products that are strongly adsorbed [286][287][288]. However, Barczuk et al289 doubts the electron mediating function of the PMo 12 in the electrooxidation of ethanol, despite the fact the chronoamperometric results evident an increase in current and stability of the metal catalyst (Pt, Pt-Ru, Rt-Sn/C etc.).…”