ja7b00165_si_001.pdf (2.8 MB)
Cage-Confinement Pyrolysis Route to Ultrasmall Tungsten Carbide Nanoparticles for Efficient Electrocatalytic Hydrogen Evolution
journal contribution
posted on 2017-04-05, 00:00 authored by Yan-Tong Xu, Xiaofen Xiao, Zi-Ming Ye, Shenlong Zhao, Rongan Shen, Chun-Ting He, Jie-Peng Zhang, Yadong Li, Xiao-Ming ChenThe
size-controlled synthesis of ultrasmall metal-based catalysts
is of vital importance for chemical conversion technologies. Here,
a cage-confinement pyrolysis strategy is presented for the synthesis
of ultrasmall tungsten carbide nanoclusters/nanoparticles. An RHO
type zeolitic metal azolate framework MAF-6, possessing large nanocages
and small apertures, is selected to confine the metal source W(CO)6. High temperature pyrolysis gives tungsten carbide nanoclusters/nanoparticles
with sizes ca. 2 nm, which can serve as an excellent electrocatalyst
for the hydrogen evolution reaction. In 0.5 M H2SO4, it exhibits very low overpotential of 51 mV at 10 mA cm–2 and Tafel slope of 49 mV per decade, as well as the
highest exchange current density of 2.4 mA cm–2 among
all tungsten/molybdenum-based catalysts. Moreover, it also shows excellent
stability and antiaggregation behavior after long-term electrolytic
process.
History
Usage metrics
Categories
Keywords
antiaggregation behaviornanoclusterHigh temperature pyrolysisTafel slopetungstenRHOMAFhydrogen evolution reaction49 mVcarbideCage-Confinement Pyrolysis Route51 mVchemical conversion technologiescmsize-controlled synthesismAcage-confinement pyrolysis strategyUltrasmall Tungsten Carbide Nanoparticles0.5 M H 2ultrasmall metal-based catalysts2 nmEfficient Electrocatalytic Hydrogen Evolution
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC