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A method for improving catalytic hydrogen evolution performance of iron-based amorphous alloy

An iron-based amorphous alloy and hydrogen evolution technology, applied in chemical instruments and methods, non-noble metal oxide coatings, physical/chemical process catalysts, etc., can solve the problems of poor stability and small active specific surface area of ​​iron-based amorphous catalysts , to increase the active specific surface area, reduce the overpotential of hydrogen evolution, and overcome the effect of easy corrosion

Active Publication Date: 2021-02-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Purpose of the invention: In view of the problems of the existing iron-based amorphous alloy strips with small active specific surface area and poor stability of iron-based amorphous catalysts under acidic conditions, the present invention provides a method for improving the catalytic hydrogen evolution performance of iron-based amorphous alloys

Method used

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  • A method for improving catalytic hydrogen evolution performance of iron-based amorphous alloy
  • A method for improving catalytic hydrogen evolution performance of iron-based amorphous alloy
  • A method for improving catalytic hydrogen evolution performance of iron-based amorphous alloy

Examples

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Embodiment 1

[0030] Separately prepare Fe 76 Mo 4 P 13 C 7 Amorphous alloy strip and Fe 70 Mo 10 P 13 C 7 Amorphous alloy strip.

[0031] The preparation process is as follows:

[0032] (1) Weigh the high-purity Fe, Mo, FeP, and C according to the atomic percentage conversion. Under the high-purity argon atmosphere, first melt the Fe, Mo, and C into alloy ingots by electric arc, and remelt the alloy ingots at least 4 times To ensure that the alloy composition is uniform, then the alloy ingot is mixed with FeP for induction melting;

[0033] (2) Using single-roll stripping equipment, the master alloy ingot Fe 80-x Mo x P 13 C 7 (x=4, 10) Induction melting is carried out in an argon atmosphere, and the molten metal is sprayed onto a copper roller with a speed of 40m / s through an instantaneous pressure difference (0.02MPa) to obtain a 1-3mm wide and 20-30μm thick Fe 80-x Mox P 13 C 7 (x=4,10) alloy strip.

[0034] Take part of the prepared Fe 76 Mo 4 P 13 C 7 Alloy Strip ...

Embodiment 2

[0037] To the Fe that embodiment 1 makes 76 Mo 4 P 13 C 7 Amorphous alloy strip and Fe 70 Mo 10 P 13 C 7 Amorphous alloy ribbons were subjected to cyclic voltammetry scanning activation and HNO 3 Solution etching treatment.

[0038] with Fe 76 Mo 4 P 13 C 7 Taking amorphous alloy strip as an example, the activation and etching steps are as follows:

[0039] (1) Fe with the length of 2cm prepared in Example 1 76 Mo 4 P 13 C 7 The amorphous alloy strip is used as the working electrode, the Ag / AgCl is used as the reference electrode, and the graphite rod is used as the counter electrode. 2 SO 4 Electrolyte, at 10mV s -1 Cyclic voltammetry scan (CV) was carried out in the range of -0.19~0.16V vs RHE voltage, and the scan was stopped when the cyclic voltammetry curves coincided.

[0040] figure 2 for Fe 76 Mo 4 P 13 C 7 The cyclic voltammetry curve of the amorphous alloy strip can be seen from the figure. As the number of cyclic voltammetry scans increases,...

Embodiment 3

[0043] For the Fe prepared in Example 1 80-x Mo x P 13 C 7 (x=4,10) amorphous alloy strip material, the amorphous alloy strip material and HNO after cyclic voltammetry scanning activation in embodiment 2 3 The electrochemical properties of the amorphous alloy strips after solution etching treatment were tested respectively.

[0044] (1) at 0.5M H 2 SO 4 In the electrolyte, the amorphous alloy strips prepared in Example 1 and the activated amorphous alloy strips prepared in Example 2 were used as working electrodes, Ag / AgCl as reference electrodes, and graphite rods as counter electrodes. electrode, at 5mV s -1 A linear sweep voltammetry was performed at a sweep rate of 100%.

[0045] image 3 Fe before and after activation 80-x Mo x P 13 C 7 (x=4, 10) The LSV curve of the amorphous alloy strip, it can be seen that when the current density is 10mA cm -2 , Fe before activation 76 Mo 4 P 13 C 7 , Fe 70 Mo 10 P 13 C 7 The overpotentials are: 165mV, 283mV; the ...

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Abstract

The invention discloses a method for improving the catalytic hydrogen evolution performance of an iron-based amorphous alloy, and relates to the field of electrolytic water catalysts. The method for improving the catalytic hydrogen evolution performance of iron-based amorphous alloys comprises the following steps: (1) adopting an electrochemical workstation three-electrode system, using iron-based amorphous alloy strips as working electrodes, H 2 SO 4 The iron-based amorphous alloy strip is activated by cyclic voltammetry scanning in a hydrogen evolution reaction system; (2) the activated iron-based amorphous alloy strip is etched with a strong oxidizing solution. The invention first processes the amorphous alloy strip by cyclic voltammetry, which significantly increases the active specific surface area of ​​the amorphous alloy strip, significantly reduces the hydrogen evolution overpotential of the iron-based amorphous alloy, and effectively solves the problem of the active specific surface area of ​​the strip. Minor question; then pass HNO 3 The solution etches the activated amorphous alloy strip to passivate the surface, overcomes the problem that the iron-based amorphous catalyst is easily corroded under acidic conditions, and improves the long-term effective working stability of the catalyst.

Description

technical field [0001] The invention relates to a method for improving the catalytic hydrogen evolution performance of an iron-based amorphous alloy, and belongs to the technical field of electrolytic water hydrogen production catalysts. Background technique [0002] With the energy crisis and environmental pollution problems brought about by economic development, hydrogen, as a clean, efficient and renewable energy, has great development prospects. Water electrolysis is an important way to produce high-purity hydrogen and develop sustainable energy. Water electrolysis consists of two half-reactions, hydrogen evolution at the cathode (HER) and oxygen evolution at the anode (OER). Therefore, it is necessary to develop electrolytic water catalysts to reduce energy consumption and increase energy conversion rate. [0003] At present, the commercial catalysts are mainly noble metals Pt, Ir or their oxides, but they are expensive and the reserves are scarce, so it is urgent to d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/046C25B1/04C23C22/50C22C45/02B22D11/06
CPCB01J27/19B01J35/1004B22D11/0611C22C45/02C23C22/50C25B1/02C25B11/061Y02E60/36
Inventor 沈宝龙邵根苗王倩倩苗芳
Owner SOUTHEAST UNIV