%0 Journal Article
%A Xu, Yan-Tong
%A Xiao, Xiaofen
%A Ye, Zi-Ming
%A Zhao, Shenlong
%A Shen, Rongan
%A He, Chun-Ting
%A Zhang, Jie-Peng
%A Li, Yadong
%A Chen, Xiao-Ming
%D 2017
%T Cage-Confinement
Pyrolysis Route to Ultrasmall Tungsten
Carbide Nanoparticles for Efficient Electrocatalytic Hydrogen Evolution
%U https://acs.figshare.com/articles/journal_contribution/Cage-Confinement_Pyrolysis_Route_to_Ultrasmall_Tungsten_Carbide_Nanoparticles_for_Efficient_Electrocatalytic_Hydrogen_Evolution/4834370
%R 10.1021/jacs.7b00165.s001
%2 https://acs.figshare.com/ndownloader/files/8025137
%K antiaggregation behavior
%K nanocluster
%K High temperature pyrolysis
%K Tafel slope
%K tungsten
%K RHO
%K MAF
%K hydrogen evolution reaction
%K 49 mV
%K carbide
%K Cage-Confinement Pyrolysis Route
%K 51 mV
%K chemical conversion technologies
%K cm
%K size-controlled synthesis
%K mA
%K cage-confinement pyrolysis strategy
%K Ultrasmall Tungsten Carbide Nanoparticles
%K 0.5 M H 2
%K ultrasmall metal-based catalysts
%K 2 nm
%K Efficient Electrocatalytic Hydrogen Evolution
%X The
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.
%I ACS Publications