The invention relates to a transition metal boride catalyst, a preparation method and its application in electrocatalytic water cracking for hydrogen production, belonging to the technical field of inorganic functional materials. The patented technology of the invention relates to a preparation method of a transition metal boride catalyst, in which chloride of the transition metal is used as a metal source, MgB2 as a boron source, and Mg powder is used as an auxiliary for quasi-solid phase replacement reaction. The reaction temperature is 700℃ ~ 1000℃, and the reaction time is 3 ~ 10 hours. A series of pure phase transition metal borides catalysts, such as VB, NbB, TaB, CrB, MoB, WB, FeB, RuB1.1, etc. can be obtained by selecting different metal sources through the method mentioned above, all of which have electrocatalytic activity. Among them, RuB1.1 is the best, with excellent catalytic activity and stability under acidic conditions and current density of 10mA cm
The invention relates to a transition metal boride catalyst, a preparation method and its application
The patented technology belongs to inorganic functional materials
In particular, the invention relates to a transition metal boride catalyst, a preparation method and its application in electrocatalytic water cracking for hydrogen production.
Technology is introduced
The rapid development of clean, renewable and green energy has been promoted by the world’s growing population, environmental degradation and energy shortage. The production of hydrogen by electrocatalytic water cracking is based on renewable resources, which accords with the sustainable development of modern society and economy. Platinum-based materials are currently the most efficient electrocatalytic materials, but their high cost and low reserves limit their application. Therefore, it is of great significance to develop low-cost and efficient platinum-based alternative electrocatalysts. Transition borides are a kind of multifunctional material with high conductivity, high stability, corrosion resistance and high temperature resistance. Magnesium diboride and niobium boride are superconductors. Diboride molybdenum has excellent electronic transmission capacity, is a highly efficient electric catalytic cracking water hydrogen production materials (J.A m.C hem. Soc., 2017139123, 70). Transition metal borides are rich in structure and potential multifunctional properties, which arouse the interest of scientists in the study of synthetic metal borides. Up to now, the synthesis of transition metal borides has required crossing a high energy barrier due to the high melting point of transition metal and boron, which generally requires high temperature, high pressure and long time solid phase sintering. Secondly, the formation energy of some transition metal borides is close, and the single-phase synthesis interval is narrow, so it is easy to prepare mixed borides. The single-phase preparation is very difficult. The existence of mixed phase limits the potential multifunctional properties of transition metal borides. Therefore, the synthesis of pure phase transition metal borides with mild conditions and easy operation has become a major difficulty in the development of borides.
Technical implementation idea
This patented technology is aimed at preparing pure phase and highly efficient hydrogen-cracking catalysts, and provides a universal method of quasi-solid phase replacement reaction. A series of pure phase transition metal borides can be prepared by taking chloride of transition metal as the metal source, MgB2 as the boron source and Mg powder as the auxiliary. This patented technology provides a preparation method for transition metal borides…
[technical protection point]
1. A preparation method for a transition metal boride catalyst, which is characterized by grinding and mixing the chloride salt, magnesium diboride and magnesium powder of the transition metal at a molar ratio, in which the molar ratio of chloride salt, magnesium diboride and magnesium powder of the transition metal is 2:1:1-10; The resulting mixture was calcined at a vacuum of 1Pa at a calcination temperature of 700℃ ~ 1000℃ and a calcination time of 3 ~ 10 hours. Use 0.5mol L of the calcined product
[summary of technical features]
1. A preparation method for a transition metal boride catalyst, which is characterized by grinding and mixing the chloride salt, magnesium diboride and magnesium powder of the transition metal at a molar ratio, in which the molar ratio of chloride salt, magnesium diboride and magnesium powder of the transition metal is 2:1:1-10; The resulting mixture was calcined at a vacuum of 1Pa at a calcination temperature of 700℃ ~ 1000℃ and a calcination time of 3 ~ 10 hours. The calcined products were soaked in a sulfuric acid solution of 0.5 moll-1 for 2 to 8 hours to remove impurities, and then cleaned by centrifugation with water and ethanol, and then dried. The pure phase transition metal boride catalyst powder was obtained. 2. As described in claim 1, a preparation method for a transition metal boride catalyst,…
