Morphology‐Controlled Synthesis of Molybdenum Disulfide Wrapped Single‐Walled Carbon Nanotubes for the Hydrogen Evolution Reaction

Abstract

The synthesis of new nanohybrid catalysts with a tunable structure and the exploration of their synergistic behaviors have captured substantial attention. In this work, amorphous molybdenum disulfide/single‐walled carbon nanotubes (MoS2/SWNTs) composites are synthesized by a facile hydrothermal process with the assistance of l‐cysteine. We varied the mass ratio of sodium molybdate (the in situ Mo source) to SWNTs, this method provides a well‐defined pathway to enable the morphological control over the evolution of MoS2 from nanospheres to nanofilaments, nanorods, and nanosheets. Among the as‐obtained samples, the MoS2/SWNTs (1:1) hybrids, which displayed a 3 D architecture that consisted of nanorods, exhibited the highest activity in the hydrogen evolution reaction (HER). Compared with pure MoS2, the MoS2 nanosheets that decorate the SWNTs have more highly exposed active edges, and the SWNTs in the center of the MoS2/SWNTs nanorods can enhance the conductivity. We regulated the ratio between MoS2 and SWNTs to obtain a balance between the number of active sites and the conductivity of MoS2/SWNTs. Here, MoS2/SWNTs nanorods exhibited a low overpotential of 195 mV at 20 mA cm−2 and a low Tafel slope of 41 mV dec−1 for MoS2‐based HER catalysts.

A p‐n WO3/SnSe2 Heterojunction for Efficient Photo‐assisted Electrocatalysis of the Oxygen Evolution Reaction

“…[36,41] The characteristic carbon peaks were displayed at 1330 and 1580 cm À1 , which could be assigned to the D and G bands of carbon, respectively. [42] The D band corresponded to the defects or structurally disordered carbon and the G band was associated with the ordered sp 2 bonded carbon, indicating the degree of the graphitic phase. [43] The I D /I G intensity ratios for the CNTs and CF/ CNTs were calculated as 1.31 and 1.40, respectively, indicating that the CF hybridization resulted in more structural defects in the CNTs and changes the electronic structure of the CNTs.…”

High-Performance MoS2/SWCNT Composite Films for a Flexible Thermoelectric Power Generator

“…MoS 2 nanosheets were synthesized according to ref . According to Figure a, the preparation of MoS 2 nanosheets is realized by using l -cysteine as sulfur source and reducing agent, and sodium molybdate as molybdenum source under hydrothermal conditions.…”

Structural Engineering of Nitrogen‐Doped MoS2 Anchored on Nitrogen‐Doped Carbon Nanotubes towards Enhanced Hydrogen Evolution Reaction

“…[41] The doublet peaks located at 232.8 eV (Mo 3d 5/2 ) and 235.9 eV (Mo 3d 3/2 ) correspond to the Mo 6 + valence state. [42] Among of three different valence states, Mo 4 + is the sole chemical state of Mo atoms in pristine MoS 2 crystal, while the high oxidation states of Mo 5 + and Mo 6 + are caused by the N doping in MoS 2 lattices, which have been regarded as the defect sites on MoS 2 basal planes/edges. [19]…”