Plasma Engineering of Basal Sulfur Sites on MoS 2 @Ni 3 S 2 Nanorods for the Alkaline Hydrogen Evolution Reaction.
Xin TongYun LiQingdong RuanNing PangYang ZhouDajun WuDayuan XiongShaohui XuLianwei WangPaul K ChuPublished in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2021)
Inexpensive and efficient catalysts are crucial to industrial adoption of the electrochemical hydrogen evolution reaction (HER) to produce hydrogen. Although two-dimensional (2D) MoS 2 materials have large specific surface areas, the catalytic efficiency is normally low. In this work, Ag and other dopants are plasma-implanted into MoS 2 to tailor the surface and interface to enhance the HER activity. The HER activty increases initially and then decreases with increasing dopant concentrations and implantation of Ag is observed to produce better results than Ti, Zr, Cr, N, and C. At a current density of 400 mA cm -2 , the overpotential of Ag500-MoS 2 @Ni 3 S 2 /NF is 150 mV and the Tafel slope is 41.7 mV dec -1 . First-principles calculation and experimental results reveal that Ag has higher hydrogen adsorption activity than the other dopants and the recovered S sites on the basal plane caused by plasma doping facilitate water splitting. In the two-electrode overall water splitting system with Ag500-MoS 2 @Ni 3 S 2 /NF, a small cell voltage of 1.47 V yields 10 mA cm -2 and very little degradation is observed after operation for 70 hours. The results reveal a flexible and controllable strategy to optimize the surface and interface of MoS 2 boding well for hydrogen production by commercial water splitting.
Keyphrases
- visible light
- quantum dots
- transition metal
- highly efficient
- single cell
- signaling pathway
- reduced graphene oxide
- oxidative stress
- room temperature
- lps induced
- metal organic framework
- genome wide
- gene expression
- heavy metals
- pi k akt
- nuclear factor
- bone marrow
- dna methylation
- mesenchymal stem cells
- computed tomography
- risk assessment
- pet imaging
- electronic health record
- positron emission tomography
- anaerobic digestion
- carbon nanotubes