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High-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and preparation method thereof

A transition group metal and catalyst technology, applied in the field of multi-element transition group metal phosphide hydrogen evolution catalyst and preparation, can solve the problems of low hydrogen production, high overpotential and high energy consumption, and achieve reduced hydrogen production cost, good stability, The effect of high catalytic activity

Inactive Publication Date: 2016-06-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they belong to binary transition metal phosphides, which have only one active site in anion state, which cannot meet the requirements of proton discharge in the HER process. The current density in the HER process is not high, and the overpotential is high, which brings energy High consumption and low hydrogen production

Method used

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  • High-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and preparation method thereof
  • High-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and preparation method thereof
  • High-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, comprises the following steps:

[0022] 1) Prepare the precursor by hydrothermal, add 10mmol cobalt nitrate hexahydrate into 50mL deionized water, stir to form a uniform mixed solution; transfer the mixed solution to a 100mL reactor, add carbon cloth (3×2cm 2 ), completely immerse the carbon cloth in the mixed solution; evenly add 10mL concentrated ammonia water; seal the reaction kettle, heat to 110°C and keep the constant temperature for 9h, take out the carbon cloth and dry it to obtain the precursor;

[0023] 2) Low-temperature phosphorylation of the precursor: NaH 2 PO 2 and the precursor are respectively placed in the upstream and downstream of the tube furnace, and the tube furnace is filled with argon as a protective gas, heated to 300° C. and kept at a constant temperature for 2 hours to obtain a hydrogen evolution catalyst (CoP / CC); the NaH 2 PO 2 The molar ratio with cobalt salt is 3:1.

[0024] Take the catalyst so that its area immersed in...

Embodiment 2

[0025] Embodiment 2, comprises the steps:

[0026] 1) Hydrothermal preparation of the precursor, 8 mmol of cobalt nitrate hexahydrate and 2 mmol of ferric nitrate nonahydrate were added to 50 mL of deionized water, stirred to form a uniform mixed solution; the mixed solution was transferred to a 100 mL reaction kettle, and carbon cloth (3× 2cm 2 ), completely immerse the carbon cloth in the mixed solution; evenly add 10mL of concentrated ammonia water; seal the reaction kettle, heat to 120°C and keep the constant temperature for 10h, take out the carbon cloth and dry it to obtain the precursor;

[0027] 2) Low-temperature phosphorylation of the precursor: NaH 2 PO 2 and the precursor were placed on the upstream and downstream of the tube furnace respectively, and the tube furnace was charged with argon as a protective gas, heated to 300°C and kept at a constant temperature for 2h to obtain a hydrogen evolution catalyst (Co 4 FeP / CC); The NaH 2 PO 2 The molar ratio of coba...

Embodiment 3

[0031] Embodiment 3, comprises the steps:

[0032]1) Prepare the precursor by hydrothermal, add 6.67mmol cobalt nitrate hexahydrate and 3.33mmol ferric nitrate nonahydrate into 50mL deionized water, stir to form a uniform mixed solution; transfer the mixed solution to a 100mL reaction kettle, add carbon cloth ( 3×2cm 2 ), completely immerse the carbon cloth in the mixture; evenly add 10mL of concentrated ammonia water; seal the reaction kettle, heat to 110°C and keep the constant temperature for 9h, take out the carbon cloth and dry it to obtain the precursor;

[0033] 2) Low-temperature phosphorylation of the precursor: NaH 2 PO 2 and the precursor are placed on the upstream and downstream of the tube furnace respectively, the tube furnace is filled with nitrogen or inert gas, heated to 350°C and kept at a constant temperature for more than 2h to obtain a hydrogen evolution catalyst (Co 2 FeP / CC); The NaH 2 PO 2 The molar ratio of cobalt salt and iron salt mixture is 3:1...

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Abstract

The invention discloses a high-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and a preparation method thereof. The catalyst is Co<x>Fe<y>P and is formed by being loaded in carbon cloth by a hydrothermal method. The preparation method of the catalyst comprises the following steps of preparing a precursor by the hydrothermal method, adding a certain amount of a mixture of Co(NO<3>)<2>.6H<2>O and Fe(NO<3>)<3>.9H<2>O into deionized water to form an uniform mixed solution, placing the mixed solution in a reaction kettle, adding carbon cloth (CC) as a carrier, uniformly adding strong ammonia water, hermetically heating the mixed solution to 110-120 DEG C, carrying out heat preservation for 9-10 hours, taking out the CC, and drying the CC to obtain the precursor; and carrying out low-temperature phosphorization on the precursor, separately placing NaH<2>PO<2> and the precursor in an upstream and a downstream of a tube furnace, introducing nitrogen or inert gas, heating the tube furnace to 300-350 DEG C, and carrying out heat preservation for over 2 hours to obtain the hydrogen-evolution catalyst. Compared with the prior art, the hydrogen-evolution catalyst prepared according to the method is endowed with high-efficiency and stable catalytic hydrogen evolution capability in an acidic solution, and the hydrogen production cost through electrolysis of water can be reduced.

Description

technical field [0001] The invention relates to a multi-element transition metal phosphide hydrogen evolution catalyst and a preparation method thereof, belonging to the technical field of catalytic materials. Background technique [0002] The modernization of the world economy has benefited from the wide application of fossil energy, such as oil, natural gas and coal. However, with the depletion of fossil energy and the pollution of the environment during use, we are required to develop clean and renewable energy as soon as possible. Hydrogen, as a mobile energy source, has a high mass energy density and its combustion product is water, which has attracted widespread attention. However, so far, hydrogen energy is mainly derived from water, thus electrolysis of water to produce hydrogen has attracted widespread attention, especially the hydrogen evolution reaction (HER) process 2H + +2e - →H 2 Represents the most important process in the hydrogen evolution reaction. [...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/88H01M4/9016Y02E60/50
Inventor 申燕李嫚黄德康王鸣魁
Owner HUAZHONG UNIV OF SCI & TECH
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