Saltar al contenido
Merck
  • Enhancing the methanol tolerance of platinum nanoparticles for the cathode reaction of direct methanol fuel cells through a geometric design.

Enhancing the methanol tolerance of platinum nanoparticles for the cathode reaction of direct methanol fuel cells through a geometric design.

Scientific reports (2015-11-19)
Yan Feng, Feng Ye, Hui Liu, Jun Yang
RESUMEN

Mastery over the structure of nanoparticles might be an effective way to enhance their performance for a given application. Herein we demonstrate the design of cage-bell nanostructures to enhance the methanol tolerance of platinum (Pt) nanoparticles while remaining their catalytic activity for oxygen reduction reaction. This strategy starts with the synthesis of core-shell-shell nanoparticles with Pt and silver (Ag) residing respectively in the core and inner shell regions, which are then agitated with saturated sodium chloride (NaCl) solution to eliminate the Ag component from the inner shell region, leading to the formation of bimetallic nanoparticles with a cage-bell structure, defined as a movable Pt core enclosed by a metal shell with nano-channels, which exhibit superior methanol-tolerant property in catalyzing oxygen reduction reaction due to the different diffusion behaviour of methanol and oxygen in the porous metal shell of cage-bell structured nanoparticles. In particular, the use of remarkably inexpensive chemical agent (NaCl) to promote the formation of cage-bell structured particles containing a wide spectrum of metal shells highlights its engineering merit to produce highly selective electrocatalysts on a large scale for the cathode reaction of direct methanol fuel cells.

MATERIALES
Referencia del producto
Marca
Descripción del producto

Sigma-Aldrich
Nitrato de plata, ACS reagent, ≥99.0%
Sigma-Aldrich
Oleilamina, technical grade, 70%
Sigma-Aldrich
Nitrato de plata, ReagentPlus®, ≥99.0% (titration)
Sigma-Aldrich
Nitrato de plata, 99.9999% trace metals basis
Sigma-Aldrich
Nitrato de plata, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.8%
SAFC
Oleilamina, ≥98% (primary amine)
Sigma-Aldrich
Potassium tetrachloroplatinate(II), 98%
Sigma-Aldrich
Nitrato de plata, puriss. p.a., ≥99.5% (AT)
Sigma-Aldrich
Nitrato de plata, meets analytical specification of Ph. Eur., BP, USP, 99.8-100.5%
Sigma-Aldrich
Potassium tetrachloroplatinate(II), ≥99.9% trace metals basis
Sigma-Aldrich
Ruthenium(III) chloride, Ru content 45-55%
Sigma-Aldrich
Nitrato de plata, BioReagent, suitable for plant cell culture, >99% (titration)
Sigma-Aldrich
Nitrato de plata solution, 2.5 % (w/v) AgNO3 in H2O
Sigma-Aldrich
Silver nitrate on silica gel, extent of labeling: ~10 wt. % loading, +230 mesh
Sigma-Aldrich
Potassium tetrachloroplatinate(II), 99.99% trace metals basis
Sigma-Aldrich
Nitrato de plata, anhydrous, ≥99.999% trace metals basis
Sigma-Aldrich
Osmium(III) chloride, 99.9% trace metals basis
Sigma-Aldrich
Nitrato de plata, BioXtra, >99% (titration)