CN114717570B - Weak-binding water structure modified alkaline electrolyte and preparation method thereof - Google Patents
Weak-binding water structure modified alkaline electrolyte and preparation method thereof Download PDFInfo
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- CN114717570B CN114717570B CN202210278860.6A CN202210278860A CN114717570B CN 114717570 B CN114717570 B CN 114717570B CN 202210278860 A CN202210278860 A CN 202210278860A CN 114717570 B CN114717570 B CN 114717570B
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Abstract
The invention relates to a preparation method of a weakly bound water structure modified alkaline electrolyte, which comprises the following steps: preparing an alkaline electrolyte by using water and an alkaline electrolyte; adding an additive with a negatively charged surface into the alkaline electrolyte configured in the step S1; and (3) carrying out ultrasonic treatment on the solution obtained in the step (S2), and stirring to fully disperse the additive with negative charges on the surface in the electrolyte to obtain the modified electrolyte. Compared with the traditional electrolyte, the surface negative charge additive modified electrolyte can improve the stability of the electrocatalytic water analysis oxygen reaction, obviously reduce the electrode overpotential, and can further improve the electrocatalytic water analysis efficiency by utilizing the surface negative charge additive modified electrolyte compared with the modification of an electrode or a catalyst. In addition, the preparation process is simple, low in cost and suitable for batch application, and has wide application prospects in the fields of electrocatalysis and photocatalysis.
Description
Technical Field
The invention relates to the technical field of electrochemical water splitting hydrogen production, in particular to a weakly bound water structure modified alkaline electrolyte and a preparation method thereof.
Background
In response to the increasing energy shortage and environmental crisis, the development of renewable clean energy has become a subject of great concern. The electrochemical water splitting technology can convert electric energy obtained by solar energy into hydrogen energy with high energy density through water splitting reaction. The electrochemical water splitting reaction consists of three tandem processes of cathodic Hydrogen Evolution (HER) and anodic Oxygen Evolution (OER) in solution. OER involves a four-electron process, with slow reaction kinetics, as compared to HER involving two electrons, which becomes a major bottleneck limiting the energy conversion efficiency of water splitting batteries. Therefore, the improvement of OER efficiency is significant for realizing high-efficiency photoelectrochemical water decomposition.
According to the prior study, the slow Oxygen Evolution Reaction (OER) of the solid-liquid interface of the electrocatalyst/electrolyte is a rapid control step of the electrolytic water reaction. Therefore, improving the efficiency of Oxygen Evolution Reaction (OER) has become the primary task of research. The current optimization strategies for improving OER efficiency can be mainly divided into two directions: and optimizing and modifying the electrocatalyst and the electrolyte. Among them, OER electrocatalysts have been widely studied, for example: CN109647477B, CN111841602B, CN111437831B. However, for the series reaction process of OER, less research and performance-lagging electrolyte will become a short plate and bottleneck limiting OER efficiency compared to the fast developing electrocatalyst.
At present, less researches are carried out on electrolyte, and Chinese patent application CN111101143A discloses a method for reducing the overpotential of an electrode by reducing the influence of bubbles on the effective working area of the electrode by utilizing a perfluorinated organic additive, wherein the method has the defects that the influence of bubbles on the effective working area can only be solved, the reaction kinetics process of OER can not be promoted, and the improvement of the efficiency and the service life extension of the electrode are limited; chinese patent application CN113078331a discloses a high performance electrolyte for magnesium water hydrogen production cells, utilizing cationic or anionic additives to strip the reaction product Mg (OH) effectively 2 The method has the defects of narrow application range and capability of improving the efficiency and the service life of the magnesium water hydrogen production battery.
OER in alkaline electrolyte, the reactant being OH - Due to hydration, a hydration shell is formed around the electrode, which prevents the transmission and adsorption of OH-to the electrode surface. It is therefore desirable to find a way to thin the OH-hydration shell to effectively improve OER efficiency and stability.
Disclosure of Invention
The invention aims to: in order to solve the technical problems, the invention provides a weakly bound water structure modified alkaline electrolyte and a preparation method thereof.
The technical scheme is as follows: the invention relates to a preparation method of a weakly bound water structure modified alkaline electrolyte, which comprises the following steps:
s1: preparing an alkaline electrolyte by using water and an alkaline electrolyte;
s2: adding an additive with a negatively charged surface into the alkaline electrolyte configured in the step S1;
s3: and (3) carrying out ultrasonic treatment on the solution obtained in the step (S2), and stirring to fully disperse the additive with negative charges on the surface in the electrolyte to obtain the modified electrolyte.
Preferably, in step S1, the alkaline electrolyte is an alkali metal hydroxide or an alkaline earth metal hydroxide, and the concentration of the alkaline electrolyte is 1X 10 -5 -10mol/L。
Preferably, in step S2, the particle size of the additive with negative charges on the surface is 0.1-100 micrometers, and the addition amount is 0.1-5% of the mass of the alkaline electrolyte.
Preferably, in step S3, the sonication time is from 1 to 20 minutes.
Preferably, in step S3, the stirring speed is 100-1000r/min.
Preferably, in step S2, the negatively charged additive is selected from one of kaolinite, illite or Mxene.
The invention also provides a weakly bound water structure modified alkaline electrolyte which is prepared by the preparation method of the weakly bound water structure modified alkaline electrolyte.
The beneficial effects are that: compared with the traditional electrolyte, the surface negative charge additive modified electrolyte can improve the stability of the electrocatalytic water analysis oxygen reaction, obviously reduce the electrode overpotential, and can further improve the electrocatalytic water analysis efficiency by utilizing the surface negative charge additive modified electrolyte compared with the modification of an electrode or a catalyst. In addition, the preparation process is simple, low in cost and suitable for batch application, and has wide application prospects in the fields of electrocatalysis and photocatalysis.
Drawings
FIG. 1 is a schematic diagram of an electrocatalytic testing apparatus for kaolin modified electrolyte in accordance with the present invention;
fig. 2 is an SEM image of a partially negatively charged microparticle as applied in the present invention.
In the figure, 1-electrolyte, 2-negatively charged particles on the surface, 3-anode, 4-cathode.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in FIG. 1, the preparation method of the weakly bound water structure modified alkaline electrolyte comprises the following steps:
s1: preparing an alkaline electrolyte by using water and an alkaline electrolyte; specifically, a certain amount of alkali metal or alkaline earth metal hydroxide is weighed and placed in an aqueous solution, and stirred until the alkali metal or alkaline earth metal hydroxide is completely dissolved; the concentration of the electrolyte is 1X 10 -5 -10mol/L; preferably at a concentration of 0.05 to 4mol/L.
S2: adding an additive with a negatively charged surface into the alkaline electrolyte configured in the step S1; the additive is one of kaolinite and Mxene; the particle size of the additive with negative charge on the surface is 0.1-100 microns, preferably 0.5-10 microns, and the addition amount of the additive with negative charge on the surface is 0.1-5% of the mass of the electrolyte, preferably 0.2-3%.
S3: and (3) carrying out ultrasonic treatment on the solution obtained in the step (S2), and stirring to fully disperse the additive with negative charges on the surface in the electrolyte to obtain the modified electrolyte. The ultrasonic treatment time is 1-20min, preferably 5-10min. The stirring process is continued at a stirring speed of 100-1000r/min, preferably 200-300r/min.
In fig. 2, a is an SEM image of Mxene particles, and b is an SEM image of kaolin particles.
Example 1
The method selects potassium hydroxide aqueous solution as the original electrolyte, and comprises the following specific implementation processes:
preparing an alkaline electrolyte: weighing 5.6g of potassium hydroxide, placing in 100mL of aqueous solution, stirring until the potassium hydroxide is completely dissolved, and preparing into electrolyte of 1 mol/L;
adding kaolin: 0.2g of kaolin (particle size of 0.5 micron) is weighed and added into 100mL of 1mol/L alkaline electrolyte, namely the additive addition amount is 0.2%, ultrasonic treatment is carried out for 5min, and stirring is carried out continuously, wherein the rotating speed is 200r/min.
Example 2
The method selects potassium hydroxide aqueous solution as the original electrolyte, and comprises the following specific implementation processes:
preparing an alkaline electrolyte: weighing 0.28g of potassium hydroxide, placing in 100mL of aqueous solution, stirring until the potassium hydroxide is completely dissolved, and preparing an electrolyte of 0.05 mol/L;
adding kaolin: 3.0g of kaolin (particle size 9.5 microns) is weighed and added into 100mL of 0.05mol/L alkaline electrolyte, namely the additive addition amount is 3%, ultrasonic treatment is carried out for 10min, and stirring is carried out continuously at the rotating speed of 200r/min.
Example 3
The method selects sodium hydroxide aqueous solution as the original electrolyte, and comprises the following specific implementation processes:
preparing an alkaline electrolyte: weighing 4.0g of sodium hydroxide, placing the sodium hydroxide into 100mL of water solution, and stirring until the sodium hydroxide is completely dissolved to prepare an electrolyte with the concentration of 1 mol/L;
adding kaolin: 3.0g of kaolin (particle size 1.5 μm) is weighed and added into 100mL of 1mol/L alkaline electrolyte, namely the additive addition amount is 3%, ultrasonic treatment is carried out for 5min, and stirring is continued at the rotating speed of 300r/min.
Example 4
The method selects potassium hydroxide aqueous solution as the original electrolyte, and comprises the following specific implementation processes:
preparing an alkaline electrolyte: weighing 11.2g of potassium hydroxide, placing in 100mL of aqueous solution, stirring until the potassium hydroxide is completely dissolved, and preparing into electrolyte of 1 mol/L;
adding Mxene: 1.0g of Mxene (particle size 1.04 μm) was weighed and added to 100mL of 1mol/L alkaline electrolyte, i.e., the additive addition was 1%, sonicated for 8min, and stirring was continued at a rotational speed of 200r/min.
Example 5
The method selects potassium hydroxide aqueous solution as the original electrolyte, and comprises the following specific implementation processes:
preparing an alkaline electrolyte: weighing 22.4g of potassium hydroxide, placing in 100mL of aqueous solution, stirring until the potassium hydroxide is completely dissolved, and preparing 4mol/L electrolyte;
adding kaolin: 3.0g of kaolin (particle size 9.5 μm) is weighed and added into 100mL of 4mol/L alkaline electrolyte, namely the additive addition amount is 3%, ultrasonic treatment is carried out for 10min, and stirring is continued at the rotating speed of 250r/min.
The performance tests obtained in examples 1-5 are shown in the following table:
from the above table, the alkaline electrolytes of examples 1 to 5 with different concentrations of different cations were modified with different amounts of negatively charged additives, and the electrocatalytic water splitting performance was significantly improved.
Claims (4)
1. The preparation method of the weakly bound water structure modified alkaline electrolyte is characterized by comprising the following steps of:
s1: preparing an alkaline electrolyte by using water and an alkaline electrolyte;
s2: adding an additive with a negatively charged surface into the alkaline electrolyte configured in the step S1;
s3: performing ultrasonic treatment on the solution obtained in the step S2, and stirring to fully disperse the additive with negative charges on the surface in the electrolyte to obtain a modified electrolyte;
in the step S1, the alkaline electrolyte is alkali metal hydroxide or alkaline earth metal hydroxide, and the concentration of the alkaline electrolyte is 0.05-10 mol/L;
in the step S2, the particle size of the additive with negative electricity on the surface is 0.1-10 microns, and the addition amount is 0.1-5% of the mass of the alkaline electrolyte;
in step S2, the surface negatively charged additive is selected from kaolinite or Mxene.
2. The method for preparing the weakly bound water structure modified alkaline electrolyte according to claim 1, which is characterized in that: in the step S3, the ultrasonic treatment time is 1-20min.
3. The method for preparing the weakly bound water structure modified alkaline electrolyte according to claim 1, which is characterized in that: in the step S3, the stirring rotating speed is 100-1000r/min.
4. A weakly bound water structure modified alkaline electrolyte prepared by the method for preparing a weakly bound water structure modified alkaline electrolyte as claimed in any one of claims 1 to 3.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507098A (en) * | 2002-12-12 | 2004-06-23 | ����Sdi��ʽ���� | Nano composite electrolytic solution film and fuel battery utilizing the same |
| CN109980302A (en) * | 2019-04-29 | 2019-07-05 | 中南大学 | A kind of water system Zinc ion battery colloidal electrolyte and its preparation method and application |
| CN111905783A (en) * | 2020-06-29 | 2020-11-10 | 复旦大学 | Molybdenum carbide/carbon nano hydrogen production catalyst synthesized by using ink |
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| US20140205909A1 (en) * | 2011-08-23 | 2014-07-24 | Nippon Shokubai Co., Ltd. | Negative electrode mixture or gel electrolyte, and battery using said negative electrode mixture or said gel electrolyte |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507098A (en) * | 2002-12-12 | 2004-06-23 | ����Sdi��ʽ���� | Nano composite electrolytic solution film and fuel battery utilizing the same |
| CN109980302A (en) * | 2019-04-29 | 2019-07-05 | 中南大学 | A kind of water system Zinc ion battery colloidal electrolyte and its preparation method and application |
| CN111905783A (en) * | 2020-06-29 | 2020-11-10 | 复旦大学 | Molybdenum carbide/carbon nano hydrogen production catalyst synthesized by using ink |
Non-Patent Citations (1)
| Title |
|---|
| MXenes电催化析氢的研究进展;李能等;《华中师范大学学报（自然科学版）》;第55卷(第6期);摘要，第99页左栏第1段 * |
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