2 results about "Chromium doping" patented technology

This invention discloses a trivalent chromium-doped magnesium calcium aluminate deep red phosphor and its preparation method. The phosphor is trivalent chromium ion-doped magnesium calcium aluminate with the chemical formula CaMg2Al. 16‑x O 27 :xCr 3+ The elemental molar ratio is Ca:Mg:Al:O:Cr = 1:2:(16-x):27:x, where 0.01≤x≤0.10. This invention also discloses a method for preparing this phosphor. The deep red luminescent phosphor of this invention exhibits absorption in the 300-650 nm region and its emission spectrum is located in the 600-880 nm region. Its emission color is in the deep red to near-infrared range, which matches the deep red absorption spectrum of plant photosynthesis. This phosphor has potential application prospects in plant LED lighting.

The invention relates to the technical field of catalyst preparation and application, in particular to a molybdenum disulfide catalyst and a preparation method and application thereof.The preparation method comprises the steps that chromium salt, thiourea and ammonium molybdate are dissolved in deionized water, a pretreated conductive substrate is added, and a uniform self-supporting chromium-doped molybdenum disulfide nanosheet array is synthesized through a one-step hydrothermal method. The electronic structure of molybdenum disulfide is regulated and controlled through chromium doping, the catalytic reaction energy barrier is reduced, and the conductivity and the catalytic performance are improved. The prepared chromium-doped molybdenum disulfide ultrafine nanosheet catalyst has good catalytic activity when being used for hydrogen evolution reaction. In a three-electrode alkaline electrolytic cell hydrogen production system, the current density of 10 mA cm <-2 > can be output by only needing the low potential of 0.142 V, and the target of efficient and energy-saving hydrogen production is achieved. The method has the advantages of simple and controllable preparation process, low preparation cost, large-scale production and the like, and can be used as an efficient catalyst for water electrolysis hydrogen production reaction.