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Catalyst for producing hydrogen through large-current electro-catalysis water decomposition as well as preparation method and application of catalyst

An electrocatalytic, high-current technology, applied in electrolysis components, electrolysis process, electrodes, etc., can solve the problems of low current density of hydrogen evolution reaction, limited application prospects, single catalytic site, etc., to achieve process controllable, excellent electrochemistry Performance and stability of catalytic water splitting for hydrogen production, and the effect of improving catalytic activity

Pending Publication Date: 2022-08-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method faces the problems that many excellent materials cannot be grown in situ, the materials are easy to fall off, the intrinsic activity is poor, and the catalytic site is relatively single, which leads to the low current density and large overpotential of the hydrogen evolution reaction, which limits its application in the industry. Prospects for Conditions Applied

Method used

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  • Catalyst for producing hydrogen through large-current electro-catalysis water decomposition as well as preparation method and application of catalyst
  • Catalyst for producing hydrogen through large-current electro-catalysis water decomposition as well as preparation method and application of catalyst
  • Catalyst for producing hydrogen through large-current electro-catalysis water decomposition as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Mix 15 mL of concentrated hydrochloric acid with a mass fraction of 36.0% and 30 mL of anhydrous ethanol, and stir evenly, then immerse a piece of 2cm×4cm×1.5mm foam nickel current collector in it, and ultrasonically treat it for 30min to remove the metal oxides and organic substances on the surface. . The nickel foam was taken out, washed three times with deionized water, and placed in 45 mL of deionized water for 30 min to sonicate to remove residual hydrochloric acid and ethanol, and set aside.

[0095] Dissolve 0.6 mmol of ammonium molybdate tetrahydrate and 2.4 mmol of cobalt nitrate hexahydrate in 60 mL of deionized water, and stir well to dissolve. The mixed solution was transferred to a 100 mL reaction kettle, the pretreated nickel foam was added, and the reaction was heated to 150 °C for 6 h. After the reaction, it was naturally cooled to room temperature, and the bulk material was taken out and washed three times with deionized water, and dried in an oven at ...

Embodiment 2

[0100] Using the metal precursor bulk material prepared in Example 1, it was placed in a vacuum tube furnace under 300mL / min H 2 Under the reducing atmosphere of / Ar mixed gas (hydrogen-argon volume ratio 1 / 9), the catalyst was heated to 400°C at a heating rate of 5°C / min, kept for 2 h, and then cooled to room temperature naturally. The obtained catalyst was recorded as CoO / CoMoO 4 . After calculation, based on the total weight of the catalyst, the total loading of active components in the catalyst prepared in this implementation is 66.10 wt %.

[0101] image 3 The XRD pattern of the catalyst prepared in this example is shown. It can be seen that the catalyst prepared in this example is composed of CoO and CoMoO 4 composition of two phases.

[0102] Figure 4 SEM images (a-c) and HRTEM images (d) of the catalyst prepared in this example. It can be seen that CoO / CoMoO 4 The main structure is also composed of rod-like CoMoO 4 The composition of CoO particles on its surf...

Embodiment 3

[0104] The metal precursor bulk material prepared in Example 1 was placed in a vacuum tube furnace, and was heated at 300 mL / min of H 2 / Ar mixed gas (hydrogen-argon volume ratio 1 / 9) in a reducing atmosphere, heated to 600 °C at a heating rate of 5 °C / min, kept for 2 h, and then cooled to room temperature naturally, the obtained catalyst was recorded as CoMo / CoO / CoMoO 3 . After calculation, based on the total weight of the catalyst, the total loading of the active components in the catalyst prepared in this implementation is 59.20 wt %.

[0105] Figure 5 The XRD pattern of the catalyst prepared in this example is shown. It can be seen that the catalyst prepared in this example is composed of CoMo, CoO and CoMoO 3 composed of three phases.

[0106] Image 6 SEM images (a-c) and HRTEM images (d-f) of the catalyst prepared in this example. It can be seen that CoMo / CoO / CoMoO 3 It consists of a rod-like structure and its surface particles, but the particle size increases s...

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Abstract

The invention discloses a plurality of high-current electrocatalytic water decomposition hydrogen production catalysts and a preparation method and application thereof. The catalysts comprise current collectors and active components growing on the current collectors in situ, the active component comprises a rod-shaped metal oxide, and granular metal and metal oxide which uniformly grow on the rod-shaped metal oxide. The catalyst has multiple active components, the multiple active components have a synergistic effect, and the components are tightly combined to form a multi-pole series structure, so that a large number of catalytic active sites are exposed, the conductivity is improved, and the catalyst has high-strength stability. As an application, the catalyst has excellent catalytic performance and long-range stability in electrocatalytic hydrogen production reaction under high current density.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a variety of catalysts for producing hydrogen by high-current electrocatalytic water splitting, and preparation methods and applications thereof. Background technique [0002] Hydrogen production from water electrolysis is a sustainable hydrogen production method that is environmentally friendly, convenient and has great development potential. A lot of research has been devoted to reducing the hydrogen evolution reaction to 10 mA cm through different control strategies, such as dimensional control, defect engineering, doping, heterojunction, morphology control, use of current collectors, etc. -2 The overpotential and Tafel slope of the reaction are improved, and the working stability of the cathode material is improved, thereby improving the comprehensive performance of the catalytic material and its ability to be used in industrial production. However, in order to further mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/091
CPCC25B1/04C25B11/091Y02E60/36
Inventor 王勇林彬彬杨瑞陈佳东
Owner ZHEJIANG UNIV
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