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Method for improving oxygen evolution reaction performance of layered metal hydroxide

A technology of hydroxides and layered metals, applied in the field of electrochemistry, can solve the problems of high price, limited wide application, and low reserves of precious metal catalysts, and achieve the effect of optimizing activity and stability and improving activity and stability

Active Publication Date: 2022-05-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the selection of oxygen evolution reaction catalysts, noble metal catalysts such as Ru, Ir and the corresponding oxides show excellent electrocatalytic performance, but the reserves of noble metal catalysts are low and the price is relatively expensive, which limits their wide application.

Method used

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  • Method for improving oxygen evolution reaction performance of layered metal hydroxide
  • Method for improving oxygen evolution reaction performance of layered metal hydroxide
  • Method for improving oxygen evolution reaction performance of layered metal hydroxide

Examples

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Embodiment 1

[0042] Preparation of Layered Metal Hydroxide-Metavanadate Intercalated NiFe-LDHs

[0043] Metavanadate ion intercalated NiFe-LDH was prepared by coprecipitation method. Different ratios of nickel nitrate hexahydrate and ferric nitrate nonahydrate were made into 30 mL solutions (nickel-iron molar ratio 1:1 to 5:1), which was defined as solution A. Dissolve 0.6 g of sodium hydroxide in 30 mL of aqueous solution, which is defined as solution B; solution C is a solution of 0.6 g of sodium metavanadate dissolved in 30 mL of deionized water (the water used in the experiment is deionized water protected by nitrogen) .

[0044] Add solution A and B to solution C dropwise, stir while passing nitrogen, stir in 80° C. water bath for 20 min, keep pH~10, form a solution with yellow solid precipitation, and wash the suspension obtained above by centrifugal washing ( Alternate cleaning with deionized water and ethanol solution, due to freeze-drying, the last pass must be deionized water c...

Embodiment 2

[0046] Preparation of layered metal hydroxide-carbonate intercalated NiFe-LDHs:

[0047] Preparation of CO by the Double Drop Method 3 2- Intercalated Ni 2 Fe 1 -LDHs catalyst. Specifically, the preparation strategy of the double-drop method is as follows: 1.2 mmol of nickel nitrate hexahydrate and 0.6 mmol of ferric nitrate nonahydrate are dissolved in 30 mL of deionized water. It was named Mixed Solution A. Dissolve 0.6 g of sodium hydroxide and 0.6 g of sodium carbonate in 30 mL of deionized water, thoroughly mix and dissolve after 5 min of ultrasound, and finally obtain a clear dispersion liquid, which is named mixed solution B. Dissolve 0.6 g of sodium carbonate in 30 mL of deionized water, and make it fully mixed and dissolved after 5 minutes of ultrasonication to finally obtain a clear dispersion liquid, which is named mixed solution C. The mixed solution A and the mixed solution B were slowly and uniformly dropped into the stirred solution C at the same time, kee...

Embodiment 3

[0049] Preparation of layered metal hydroxide-carbonate intercalated NiFeV-LDHs:

[0050] A series of NiFeV-LDHs catalysts with different NiFeV ratios were prepared by the double-drop method. The preparation strategy of the double drop method is: three proportions of ternary NiFeV hydrotalcite need to be prepared in this experiment, namely Ni 2 Fe 1 V 0.5 -LDHs, Ni 2 Fe 1 V 1.0 -LDHs, Ni 2 Fe 1 V 1.5 -LDHs. with Ni 2 Fe 1 V 0.5The preparation method of -LDHs is taken as an example, 2 mmol of nickel nitrate hexahydrate, 1 mmol of ferric nitrate nonahydrate, 0.5 mmol of vanadium trichloride are dissolved in 30 mL of deionized water, and it is fully mixed and dissolved by ultrasonic for 5 min, and finally a clear dispersion liquid is obtained. , named as mixed solution A; dissolve 0.6 g of NaOH in 30 mL of deionized water, and make it uniformly dispersed after 5 min of ultrasound, and named it as mixed solution B; solution C is 30 mL of deionized water. The mixed sol...

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Abstract

The invention belongs to the technical field of electrochemistry, and particularly relates to a method for improving oxygen evolution reaction performance of layered metal hydroxide. The layered metal hydroxide comprises interlayer metal hydroxides and interlayer anions, and metals in the interlayer metal hydroxides are selected from two or more of transition metals; the method comprises the step of simultaneously adding oxometallate ions between layers of the layered metal hydroxide and into electrolyte participating in oxygen evolution reaction. The invention accidentally finds that when VO3 <-> simultaneously exists between LDHs layers and in an electrolyte, the stability of the oxygen evolution reaction can be effectively optimized. Under the condition of 100 mA / cm < 2 >, when the concentration ratio of OH <-> to VO3 <-> of the VO3 <->-NiFe-LDHs in the electrolyte is 2000, the lowest overvoltage reaches 2.06 V. (1) when the VO3 <-> concentration of the VO3 <->-NiFe-LDHs in the electrolyte is 0.50 mM, compared with other concentrations (0.00 mM, 0.10 mM, 0.25 mM, 0.65 mM, 0.80 mM and 1.00 mM), the VO3 <-> concentration of the VO3 <->-NiFe-LDHs is respectively reduced by 0.28 V, 0.07 V, 0.01 V, 0.1 V, 0.11 V and 0.17 V; and (2) when the electrolyte concentration is 0.50 mM NaVO3 solution, compared with the other two catalysts, the test voltages of VO3 <->-NiFe-LDHs are respectively reduced by 0.01 V and 0.1 V.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for improving the oxygen evolution reaction performance of a layered metal hydroxide. Background technique [0002] Nowadays, people's demand for energy is increasing, and non-renewable energy in nature is becoming more and more scarce. The over-exploitation of the three major fossil fuels (coal, oil and natural gas) not only causes serious environmental pollution, but also threatens national energy security. In order to solve this serious problem, in recent years, countries around the world have invested a lot of money to research and develop clean and renewable energy, such as metal batteries, polymer electrolyte fuel cells and water electrolysis, among which water electrolysis is considered to be the most developed One of the promising technologies. The hydrogen and oxygen produced by the water splitting reaction can convert solar energy or elec...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04Y02E60/36
Inventor 孙晓明周道金张也弛
Owner BEIJING UNIV OF CHEM TECH
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