Preparation method and application of Ni-doped MIL-88A-CoMo8 composite material

Abstract

The invention discloses a preparation method and application of a Ni-doped MIL-88A-CoMo8 composite material, and the preparation method comprises the following steps: (1) dissolving 1.2 mmol of fumaric acid in 25 ml of deionized water, and stirring at 70 DEG C at 4000 rpm for 10 min to obtain a solution A; (2) dissolving 1.3 mmol of FeCl3. 9H2O, 3.9 mmol of Ni (NO3) 2.6 H2O and 0.1 or 0.2 or 0.3 mmol of CoMo8 in 5ml of deionized water, and stirring at the normal temperature at the speed of 4000 rpm for 10 minutes, so as to obtain a solution B; (3) adding the solution B into the solution A, and stirring for 10 minutes; (4) transferring the mixed solution in the step (3) into a polytetrafluoroethylene-lined stainless steel high-pressure kettle, and keeping for 6 hours at 120 DEG C; and cooling to room temperature, carrying out centrifugal separation, washing with deionized water and ethanol, and drying in a vacuum drying oven to obtain the Ni-MIL-88A-coated CoMo8 composite material. The Fe-MOF and the cobalt-molybdenum polyacid are selected to be compounded, nickel doping is performed on the Fe-MOF and the cobalt-molybdenum polyacid, the Fe-MOF and the cobalt-molybdenum polyacid are simple and easy to obtain, the cost is low, and efficient electro-catalysis hydrogen evolution performance and good stability are achieved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a Ni-doped MIL-88A@CoMo 8 The preparation method of the composite material, meanwhile, also relates to the Ni-doped MIL-88A@CoMo prepared by the preparation method 8 Application of composite materials in electrocatalytic hydrogen evolution. Background technique [0002] Energy crisis and environmental problems have become two serious challenges facing mankind. Electrochemical conversion and storage are the most promising energy storage methods, and more and more researches have begun to develop advanced and efficient energy conversion and storage. The search for electrocatalysts with small overpotentials, good stability and fast reaction rates is a relevant topic of current research. Whether it is hydrogen evolution or oxygen evolution in electrocatalytic water splitting, an efficient catalyst is required to reduce the reaction energy barrier and improve the utiliz...

AI Technical Summary

Problems solved by technology

Noble metal materials are recognized as state-of-the-art active hydrogen and oxygen evolution catalysts, but their limited reserves and high price limit their large-scale application in industry

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