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Molybdenum sulfide-coated cobalt-MOF/NF hydrogen evolution material, in-situ synthesis method and application

A technology of in-situ synthesis and hydrogen evolution reaction, applied in the direction of electrolysis components, electrodes, electrolysis process, etc., can solve problems such as hindering large-scale application, high cost and scarcity, and achieve improved hydrogen evolution performance and stability, low raw material cost, The effect of the fast rate of hydrogen

Active Publication Date: 2021-08-13
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Pt and Ru / Ir-based composites are considered as state-of-the-art electrocatalysts for HER and OER, their high cost and scarcity severely hinder large-scale applications.

Method used

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  • Molybdenum sulfide-coated cobalt-MOF/NF hydrogen evolution material, in-situ synthesis method and application
  • Molybdenum sulfide-coated cobalt-MOF/NF hydrogen evolution material, in-situ synthesis method and application
  • Molybdenum sulfide-coated cobalt-MOF/NF hydrogen evolution material, in-situ synthesis method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]

[0033] The above-mentioned hydrogen evolution material is prepared by the following steps of preparation method:

[0034] Dissolve 1mmol of 2-methylimidazole and 1mmol of cobalt nitrate hexahydrate in 30mL and 50mL of deionized water respectively. After mixing, stir in a magnetic stirrer for 30min until there are no solid particles in the solution and the color is purple. Soak 1mm×4mm×1mm nickel foam at room temperature for 10h, rinse the soaked Co-MOF / NF with absolute ethanol and deionized water twice, and dry overnight at 60°C under vacuum; add 0.07mmol molybdic acid tetrahydrate Ammonium and 2mmol sodium sulfide nonahydrate were dissolved in 50mL deionized water, and 0.1mL nitric acid was added dropwise to adjust the pH. Potential electrodeposition, voltage: -0.8V; electrodeposition time: 1200s. Finally got MoS 2 @Co-MOF / NF hydrogen evolution material.

Embodiment 2

[0040]

[0041] The above-mentioned hydrogen evolution material is prepared by the following steps of preparation method:

[0042] Dissolve 1mmol of 2-methylimidazole and 1mmol of cobalt nitrate hexahydrate in 30mL and 50mL of deionized water respectively. After mixing, stir in a magnetic stirrer for 30min until there are no solid particles in the solution and the color is purple. Soak 1mm×4mm×1mm nickel foam at room temperature for 10h, rinse the soaked Co-MOF / NF with absolute ethanol and deionized water twice, and dry overnight at 60°C under vacuum; add 0.07mmol molybdic acid tetrahydrate Ammonium and 2mmol sodium sulfide nonahydrate were dissolved in 50mL deionized water, and 0.1mL nitric acid was added dropwise to adjust the pH. Potential electrodeposition, voltage: -0.8V; electrodeposition time: 2400s. Finally got MoS 2 @Co-MOF / NF hydrogen evolution material.

Embodiment 3

[0048]

[0049] The above-mentioned hydrogen evolution material is prepared by the following steps of preparation method:

[0050] Dissolve 1mmol of 2-methylimidazole and 1mmol of cobalt nitrate hexahydrate in 30mL and 50mL of deionized water respectively. After mixing, stir in a magnetic stirrer for 30min until there are no solid particles in the solution and the color is purple. Soak 1mm×4mm×1mm nickel foam at room temperature for 10h, rinse the soaked Co-MOF / NF with absolute ethanol and deionized water twice, and dry overnight at 60°C under vacuum; add 0.07mmol molybdic acid tetrahydrate Ammonium and 2mmol sodium sulfide nonahydrate were dissolved in 50mL deionized water, and 0.1mL nitric acid was added dropwise to adjust the pH. Potential electrodeposition, voltage: -0.8V; electrodeposition time: 7200s. Finally got MoS 2 @Co-MOF / NF hydrogen evolution material.

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Abstract

The invention relates to a molybdenum sulfide-coated cobalt-MOF / NF hydrogen evolution material, an in-situ synthesis method and application. The method comprises the following steps: preparing a mixed aqueous solution A of 2-methylimidazole and cobalt nitrate hexahydrate; putting a foam liquid into the mixed aqueous solution A prepared in the step S1, and conducting standing and soaking to obtain Co-MOF / NF; mixing ammonium molybdate hydrate, sodium sulfide nonahydrate and deionized water to obtain a mixed solution B; and transferring the Co-MOF / NF into the mixed solution B, and carrying out a constant potential electrodeposition reaction to obtain MoS2-coated Co-MOF / NF. Compared with the prior art, the preparation method has the advantages that the flaky Co-MOF is self-loaded on the NF, so that the specific surface area of the material is increased, the contact area of the material and water is increased, hydrogen is easier to prepare, meanwhile, the nano structure of the material is improved, and the hydrogen evolution performance and stability of the material are improved.

Description

technical field [0001] The invention relates to the technical field of hydrogen energy, in particular to a molybdenum sulfide@cobalt-MOF / NF hydrogen evolution material and an in-situ synthesis method and application. Background technique [0002] With the depletion of fossil fuels, various new energy sources are constantly being developed and utilized. As a renewable secondary energy source, hydrogen energy has a wide range of sources, high calorific value, cleanliness, and good combustion stability. It is a new generation of energy carriers widely used after fossil fuels and other non-renewable energy sources. [0003] Electrocatalytic water splitting consists of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), which is considered to be a promising candidate for the production of high-purity hydrogen (H 2 ) effective technique. A great deal of work has been devoted to elucidating the cost-effective HER performance of electrolysis in acidic el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/095C25B11/061C25B11/052C25B11/031C25B1/04
CPCC25B1/04Y02E60/36
Inventor 蒋继波孙冉黄星丛海山王云云唐佳斌陈宇凯韩生
Owner SHANGHAI INST OF TECH
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