Molybdenum Sulfide/N-Doped CNT Forest Hybrid Catalysts for High-Performance Hydrogen Evolution Reaction

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Cost effective hydrogen evolution reaction (HER) catalyst without using precious metallic elements is a crucial demand for environment benign energy production. Molybdenum sulfide is one of the promising candidates for such purpose, particularly in acidic condition, but its catalytic performance is inherently limited by the sparse catalytic edge sites and poor electrical conductivity. We report synthesis and HER catalysis of hybrid catalysts composed of amorphous molybdenum sulfide (MoSx) layer directly bound at vertical N-doped carbon nanotube (NCNT) forest surface. Owing to the high wettability of N-doped graphitic surface and electrostatic attraction between thiomolybdate precursor anion and N-doped sites, similar to 2 nm scale thick amorphous MoSx layers are specifically deposited at NCNT surface under low-temperature wet chemical process. The synergistic effect from the dense catalytic sites at amorphous MoSx surface and fluent charge transport along NCNT forest attains the excellent HER catalysis with onset overpotential as low as similar to 75 mV and small potential of 110 mV for 10 mA/cm(2) current density, which is the highest HER activity of molybdenum sulfide-based catalyst ever reported thus far.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-03
Language
English
Article Type
Article
Keywords

ACTIVE EDGE SITES; TRANSITION-METAL DICHALCOGENIDES; CARBON NANOTUBES; ELECTROCATALYTIC MATERIALS; MOS2; GRAPHENE; NANOSHEETS; EFFICIENT; GOLD; IDENTIFICATION

Citation

NANO LETTERS, v.14, no.3, pp.1228 - 1233

ISSN
1530-6984
DOI
10.1021/nl404108a
URI
http://hdl.handle.net/10203/189175
Appears in Collection
MS-Journal Papers(저널논문)
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