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Transition metal-based heterostructure oxygen evolution catalyst as well as preparation method and application thereof

A heterostructure, transition metal technology, applied in structural parts, electrolysis process, electrodes, etc., to achieve strong activation ability, enhance conductivity, and promote charge transfer.

Pending Publication Date: 2022-07-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still a daunting task to develop efficient, cheap, and process-friendly oxygen evolution reaction catalysts on a large scale.

Method used

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  • Transition metal-based heterostructure oxygen evolution catalyst as well as preparation method and application thereof
  • Transition metal-based heterostructure oxygen evolution catalyst as well as preparation method and application thereof
  • Transition metal-based heterostructure oxygen evolution catalyst as well as preparation method and application thereof

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Embodiment 1

[0028] The preparation method of membrane electrode integrated structure is as follows figure 1 shown, including the following steps:

[0029] (1) The Ni (NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O was dissolved in NMP in proportion to form a homogeneous solution, and then urea was added, and in NMP 2 The oil bath was heated to 100 °C in the atmosphere, and the stirring was continued for 5 h. After cooling, the precipitated product was washed and dried to obtain NiFe-LDH;

[0030] (2) The Ni (NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O was dissolved in the NMP solution in proportion to form a homogeneous solution A, and the Na 2 WO 4 Dissolve in deionized water and stir to form a homogeneous solution B, add the NiFe-LDH obtained in step (1) to solution A and disperse it ultrasonically for 30min, then add solution B dropwise, continue stirring at room temperature for 60min, and wash the precipitated product drying to obtain a layer of amorphous NiFeWO coated with 4...

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Abstract

The invention discloses a transition metal-based heterostructure oxygen evolution catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, nickel nitrate, ferric nitrate and urea are dissolved in N-methyl pyrrolidone (NMP) to be stirred and mixed to be uniform, oil bath is conducted for 5 hours in the nitrogen atmosphere of 100 DEG C, and two-dimensional flaky NiFe-LDH is obtained; dissolving nickel nitrate and ferric nitrate in an NMP solution, stirring to form a homogeneous solution A, dissolving Na2WO4 in deionized water, stirring to form a homogeneous solution B, adding NiFe-LDH into the solution A, dropwise adding the solution B, and coprecipitating to obtain NiFeWO4-coated NiFe-LDH for later use; and finally, ultrasonically dispersing graphene in NMP (N-Methyl Pyrrolidone) to form a uniform turbid liquid, adding the NiFeWO4-coated NiFe-LDH into the graphene, and ultrasonically dispersing to obtain the target product NiFeWO4-coated NiFe-LDH / G heterostructure catalyst. The catalyst provided by the invention can realize 225mV low overpotential and 33mV dec-1 Tafel slope in 1M KOH, and the related method is low in cost and easy to operate, and has potential application value in the fields of energy conversion and storage.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a heterostructured high-efficiency oxygen evolution electrocatalyst and a preparation method and application thereof. Background technique [0002] Electrochemical oxygen evolution reaction (OER) exists in various energy conversion and storage devices, such as water separation and rechargeable metal-air batteries, but since OER involves a four-electron-proton coupling process, higher voltages are required to overcome the inherent potential barriers , making the overpotential too high. Noble metal based catalyst IrO 2 and RuO 2 It has high electrocatalytic activity for OER in acidic and basic solutions and is considered as a commercial benchmark OER catalyst, but the precious metal content is scarce, expensive and unstable. Therefore, people are devoted to finding efficient, stable and abundant transition metal-based electrocatalysts for oxygen evolution reaction. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/065C25B1/04H01M4/86H01M4/88H01M4/90
CPCC25B11/091C25B11/065C25B1/04H01M4/8673H01M4/9016H01M4/88
Inventor 宋世栋付月殷芳芳赵宁波刘亚楠任佳豪马俊杰
Owner TIANJIN POLYTECHNIC UNIV
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