Defect-rich molybdenum-doped cobalt selenide/nanocarbon electrocatalyst as well as preparation method and application of defect-rich molybdenum-doped cobalt selenide/nanocarbon electrocatalyst

Abstract

The invention relates to the technical field of electrocatalysts, and discloses a defect-rich molybdenum-doped cobalt selenide / nanocarbon electrocatalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) dissolving a cobalt salt and a molybdate, adding a 2-methylimidazole solution, conducting stirring and mixing, and conducting centrifugal drying to obtain a molybdenum-doped cobalt-based metal organic framework precursor; (2) mixing the precursor with selenium powder, conducting grinding, and conducting calcining to obtain a molybdenum-doped cobalt selenide / nanocarbon electrocatalyst; and (3) carrying out heat treatment on the catalyst prepared in the step (2) to obtain the defect-rich molybdenum-doped cobalt selenide / nanocarbonelectrocatalyst. The obtained catalyst has excellent electro-catalytic activity on a water electrolysis cathode hydrogen evolution reaction under an alkaline condition, and still has relatively goodstability under long-term work.

Description

technical field

[0001] The invention relates to the technical field of electrocatalysts, in particular to a defect-rich molybdenum-doped cobalt selenide / nano-carbon electrocatalyst and its preparation method and application. Background technique

[0002] As a green renewable energy, hydrogen energy is clean and efficient compared to other traditional fossil fuels, such as coal. At present, among various hydrogen evolution methods, electrochemical water splitting hydrogen production is one of the most promising methods and has been extensively and deeply studied. However, among the effective electrocatalysts currently used for the hydrogen evolution reaction, the best electrocatalysts are generally noble metal-based catalysts (such as Pt-based catalysts), but the scarcity and high price of noble metals limit their widespread development; non-noble metal-based materials are used instead of noble metals Catalysts for efficient electrolysis of water to produce hydrogen have far...

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