nl6b03467_si_001.pdf (570.1 kB)
Highly Efficient Hydrogen Evolution from Edge-Oriented WS2(1–x)Se2x Particles on Three-Dimensional Porous NiSe2 Foam
journal contribution
posted on 2016-11-02, 00:00 authored by Haiqing Zhou, Fang Yu, Jingying Sun, Hangtian Zhu, Ishwar Kumar Mishra, Shuo Chen, Zhifeng RenThe
large consumption of natural fossil fuels and accompanying environmental
problems are driving the exploration of cost-effective and robust
catalysts for hydrogen evolution reaction (HER) in water splitting.
Tungsten dichalcogenides (WS2, WSe2, etc.) are
promising candidates for such purpose, but their HER performances
are inherently limited by the sparse catalytic edge sites and poor
electrical conductivity. Here we demonstrate a highly active and stable
HER catalyst by integrating ternary tungsten sulfoselenide WS2(1–x)Se2x particles with a 3D porous metallic NiSe2 foam, in which
good electrical conductivity, good contact, large surface area, and
high-density active edge sites are simultaneously obtained, thus contributing
to outstanding catalytic performance: large cathode current density
(−10 mA/cm2 at −88 mV), low Tafel slope (46.7
mV/dec), large exchange current density (214.7 μA/cm2), and good stability, which is better than most reports on WS2 and NiSe2 catalysts. This work paves an interesting
route for boosting HER efficiency of transition metal dichalcogenide
catalysts.