Evolutionary features of subsurface defects of single crystal diamond after dynamic friction polishing

Due to the fatigue and continuous energy input during high-speed dynamic friction polishing (DFP), the diamond crystal beneath the polished surface (roughness 50 nm) and even preferential crystal cleavage with the non-diamond phase (distributing at the position in micrometers range).</p

Evolutionary features of subsurface defects of single crystal diamond after dynamic friction polishing

Due to the fatigue and continuous energy input during high-speed dynamic friction polishing (DFP), the diamond crystal beneath the polished surface (roughness 50 nm) and even preferential crystal cleavage with the non-diamond phase (distributing at the position in micrometers range).</p

Intercalated 2D MoS₂ Utilizing a Simulated Sun Assisted Process: Reducing the HER Overpotential

Molybdenum disulfide (MoS₂) in its two-dimensional (2D) morphology has favorable catalytic properties for the hydrogen evolution reaction (HER). To fully take advantage of this capability and in order to enhance this material’s HER performance, viable methods for synthesizing and tuning electronic properties of 2D MoS₂ should be developed. Here, we demonstrate a facile and nonhazardous approach to partially intercalate Li⁺ ions into the 2D MoS₂ host structure. We show that such an intercalation is possible in a nonhazardous saline Li⁺ containing solution using a grinding/sonication-assisted exfoliation method in both dark and simulated sun irradiation conditions. A partial phase transformation from semiconducting (2H) to metallic (1T) phase is observed for the majority of flakes, after the process. We observe a notable enhancement of the HER activity for samples prepared under light illumination in the presence of a Li⁺ containing solution, in comparison to both pristine 2D MoS₂ samples and samples processed in the dark. This method provides an effective approach for phase engineering of 2D MoS₂ for enhancing its HER performance