水素発生反応に向けたMoS₂-炭素相互積層構造の電気触媒特性
Sustainable hydrogen production via electrocatalytic water splitting is a key goal for a future hydrogen economy. In this study, MoS₂-carbon inter-overlapped superstructures were fabricated using a hot-injection approach with ammonium tetrathiomolybdate as the precursor and oleylamine (OLA) as both solvent and intercalating agent, followed by a carbonization step. OLA expanded the interlayer spacing of MoS₂ to yield OLA-protected monolayer MoS₂, which upon carbonization converted OLA entirely into carbon, improving crystallinity and forming the superstructure. Characterization by XRD, FTIR, Raman spectroscopy, TEM, and XPS confirmed the structural features. The MoS₂-carbon superstructure achieved a Tafel slope of 118 mV/dec, markedly lower than the 202 mV/dec of OLA-protected monolayer MoS₂. The performance gain was attributed to enhanced c-axis conductivity from the carbon component and an increased density of catalytically active sites resulting from interlayer expansion.
Interlayer expansion by OLA increases the density of active catalytic sites on MoS₂, while carbonization of OLA improves electrical conductivity along the c-axis, collectively reducing the overpotential for the hydrogen evolution reaction.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/32708863