Henan Normal University

About: Henan Normal University is a education organization based out in Xinxiang, China. It is known for research contribution in the topics: Catalysis & Ionic liquid. The organization has 10863 authors who have published 11077 publications receiving 166773 citations.

First-principles study of the Pt ∕ Ce O 2 ( 111 ) interface

Abstract: The adsorption of platinum on the ceria (111) surface may change the reduction and redox properties of $\mathrm{Ce}{\mathrm{O}}_{2}$. The density functional theory with the inclusion of on-site Coulomb interaction has been used to study the properties of Pt adsorbed on the (111) surfaces of stoichiometric and reduced ceria. In all cases, strong interactions are found between the Pt and the surfaces. The Pt-O-Ce bonds may be formed between the Pt adatom and the surface in the preferred adsorption mode. The adsorption on the reduced surface is stronger than on the unreduced surface. The formation energy of an O vacancy at the $\mathrm{Pt}∕\mathrm{Ce}{\mathrm{O}}_{2}(111)$ interface is lower than on the clean $\mathrm{Ce}{\mathrm{O}}_{2}(111)$ surface due to the existence of the lower lying partially occupied metal induced gap states including mainly the $\mathrm{Pt}\phantom{\rule{0.2em}{0ex}}4d$ states below the empty $\mathrm{Ce}\phantom{\rule{0.2em}{0ex}}4f$ band.

Molecular-beam epitaxy of monolayer MoSe2: growth characteristics and domain boundary formation

Abstract: Monolayer (ML) transition metal dichalcogenides (TMDs) are of great research interest due to their potential use in ultrathin electronic and optoelectronic applications. They show promise in new concept devices in spintronics and valleytronics. Here we present a growth study by molecular-beam epitaxy of ML and sub-ML MoSe2, an important member of TMDs, revealing its unique growth characteristics as well as the formation processes of domain boundary (DB) defects. A dramatic effect of growth temperature and post-growth annealing on DB formation is uncovered.

Ti2O3 Nanoparticles with Ti3+ Sites toward Efficient NH3 Electrosynthesis under Ambient Conditions.

Abstract: Electrocatalytic nitrogen reduction reaction (NRR) enabled by introducing Ti3+ defect sites into TiO2 through a doping strategy has recently attracted widespread attention. However, the amount of Ti3+ ions is limited due to the low concentration of dopants. Herein, we propose Ti2O3 nanoparticles as a pure Ti3+ system that performs efficiently toward NH3 electrosynthesis under ambient conditions. This work has suggested that Ti3+ ions, as the main catalytically active sites, significantly increase the NRR activity. In an acidic electrolyte, Ti2O3 achieves extraordinary performance with a high NH3 yield and a Faradaic efficiency of 26.01 μg h-1 mg-1 cat. and 9.16%, respectively, which are superior to most titanium-based NRR catalysts recently reported. Significantly, it also demonstrates a stable NH3 yield in five consecutive cycles. Theoretical calculations uncovered that the enhanced electrocatalytic activity of Ti2O3 originated from Ti3+ active sites and significantly lowered the overpotential of the potential-determining step.