CN105603453A - In-situ regeneration method of solid polymer electrolyte water electrolyzer - Google Patents

Abstract

The invention relates to an in-situ regeneration method of a solid polymer electrolyte (SPE) water electrolysis cell, specifically, passing 0.1 to 5 mol/L cleaning solution into the solid polymer electrolyte (SPE) without disassembling the water electrolysis cell ) water electrolytic cell, wash 0.01-30h, repeat 1-10 times, then wash with pure water or deionized water for 0.1-30h, repeat 1-10 times, the performance of the electrolytic cell can be restored; the cleaning solution is Acidic solution or alkaline solution, the acidic solution is selected from one or more of H2O2 aqueous solution, hydrochloric _acid aqueous solution, sulfuric _acid aqueous solution or nitric acid aqueous solution, and the alkaline solution is selected from ammonia water, sodium hydroxide aqueous solution, potassium hydroxide aqueous solution One or more of them, the present invention does not need to disassemble the electrolytic cell, the operation is simple, the performance of the electrolytic cell can be quickly restored, and it is important for prolonging the life of the SPE water electrolytic cell and promoting the marketization process of the SPE water electrolytic cell significance.

Description

A kind of in-situ regeneration method of solid polymer electrolyte water electrolysis cell

technical field

The invention belongs to the technical field of solid polymer electrolyte water electrolysis, and in particular relates to an in-situ regeneration method of a solid polymer electrolyte water electrolysis cell.

Background technique

At present, the alkaline electrolytic cell is still the mainstream of the electrolytic hydrogen production technology, but due to its high pollution, low gas purity, high energy consumption, large volume, and alkali leakage of the electrolytic cell and many other shortcomings, it is urgent to upgrade the electrolytic technology. The solid polymer electrolyte (SPE) water electrolysis cell technology has many advantages such as high gas purity, environmental protection, low energy consumption, and small size. Therefore, many hydrogen production companies and scientific research institutions in the world are committed to developing solid polymer electrolyte (SPE) water. Electrolytic cell technology. But the life of SPE water electrolysis cell has been one of the important factors restricting the development of SPE electrolysis cell. Due to the inevitable contact with impurities in the pipeline and dust in the air during operation, the solid polymer electrolyte or electrocatalyst will be polluted over time. A large part of the impurities can be removed by physical methods such as cleaning to regenerate the performance of the electrolytic cell. In the past, the electrolytic cell was disassembled and each electrode was cleaned separately, but the workload was too large.

Therefore, it is of great significance to find a fast, efficient and low-cost regeneration method to prolong the life of SPE water electrolysis cells and promote the marketization process of SPE electrolysis cells.

Contents of the invention

The present invention relates to an in situ method for a solid polymer electrolyte (SPE) water electrolysis cell. Specifically: put the SPE electrolytic cell with degraded performance into the lotion, and clean it for a period of time to restore the performance of the electrolytic cell. The invention does not need to disassemble the electrolytic cell, and is easy to operate, can efficiently and quickly recover the performance of the electrolytic cell, and greatly prolongs the service life of the SPE water electrolytic cell.

To achieve the above object, the technical solution adopted in the present invention is:

Pass 0.1-5mol/L cleaning solution into the solid polymer electrolyte (SPE) water electrolytic cell, wash for 0.01-30h, repeat 1-10 times, then wash with pure water or deionized water for 0.1-30h, repeat 1- 10 times, the performance of the electrolytic cell can be restored;

The cleaning solution is an acidic solution or an alkaline solution, the acidic solution is selected from one or more of H2O2 aqueous solution, hydrochloric _acid aqueous solution, sulfuric _acid aqueous solution or nitric acid aqueous solution, and the alkaline solution is selected from ammonia water, sodium hydroxide One or more of aqueous solution and potassium hydroxide aqueous solution.

The cleaning time of the cleaning solution is preferably 0.1 to 30 hours, and the number of cleanings is preferably 1 to 5 times.

The cleaning time of pure water or deionized water is preferably 0.1~20h, repeat 1-5 times; or, wash with pure water or deionized water for 0.1~0.5h, repeat 1-5 times, and then wash with pure water or deionized water 0.1~10h, repeat 1~5 times.

Cleaning solution The conditions for cleaning the solid polymer electrolyte (SPE) water electrolysis cell are preferably: 0.1-5mol/L cleaning solution, cleaning 0.1-10h, repeating 1-5 times; or, 0.1-3mol/L cleaning solution, cleaning 0.1~24h, repeat 1~5 times.

The cleaning method is to use a pump to circulate the cleaning solution through the water electrolytic cell for cleaning, or pass the cleaning solution into the water electrolytic cell for immersion cleaning, or pass the cleaning solution into the water electrolytic cell by siphon method for circulation or static immersion cleaning.

During cleaning, the cleaning solution cleans the anode chamber and the cathode chamber of the water electrolytic cell simultaneously or separately, and then cleans the cathode and anode chambers at the same time with pure water or deionized water.

The above method can restore the performance of the electrolytic cell.

The present invention has the following advantages:

1. Fast and efficient. The invention saves the time for disassembling and assembling the electrolytic cell stack, and can greatly improve the regeneration efficiency of the SPE water electrolytic cell.

2. Low cost. The invention can restore the performance of the electrolytic cell by using cheap cleaning solution.

In short, the present invention adopts a low-cost regeneration method, which can efficiently and quickly prolong the life of the SPE water electrolysis cell, reduces the operating cost of the SPE water electrolysis cell, and is of great significance in promoting the marketization process of the SPE electrolysis cell.

Description of drawings

Fig. 1 process flow chart of water pump circulation cleaning SPE water electrolysis cell;

The V-I curve before and after regeneration in Fig. 2;

Figure 3 Lifetime curves before and after regeneration.

detailed description

Figure 1 shows a schematic diagram of the cycle cleaning and regeneration process of the electrolytic cell. 1 is the water tank, 2 is the lotion tank, 3 is the SPE electrolytic cell, 4 is the pump, and 5 and 6 are the stop valves. The experimental process is to pass the cleaning liquid in the washing liquid tank 2 into the SPE electrolytic cell 3 with the pump 4, close the stop valve 6 after cleaning, and then open the stop valve 5, switch to the water tank 1 and pass it into the SPE electrolytic cell 3 to complete the regeneration .

Example 1

Example 1 adopts the water pump circulation cleaning method. Firstly, the 4MH ₂ O ₂ solution is passed into the anode of the SPE water electrolysis cell for 7 hours, and then the anode and cathode of the electrolysis cell are cleaned with pure water for 8 hours. The above steps are repeated 5 times, and then the regeneration of the electrolysis cell is measured. Performance, and compare the VI curve before and after regeneration, as shown in Figure 2, the voltage of the electrolytic cell at 500mAcm ^-2 before regeneration is 1.77V, and after regeneration is 1.65V, the performance of the electrolytic cell is improved by 120mV, so this method can be used to a large extent to restore the performance of the electrolytic cell.

Example 2

Embodiment 2 adopts the siphon static cleaning method, passes 4.5M hydrochloric acid aqueous solution into the anode and cathode of the SPE water electrolysis cell, soaks the SPE water electrolysis cell for 24 hours, repeats 4 times; then cleans with pure water for 8 hours, repeats 5 times. Then continue the electrolytic cell life experiment, as shown in Figure 3, run at a constant current density of 1000mAcm ^-2 , reduce the voltage from 1.95V to 1.75V, and continue to run to 450h, the performance is basically stable, indicating that this method can recover to a large extent Electrolytic cell performance.

The above examples illustrate that the regeneration method of the present invention can prolong the life of the SPE water electrolysis cell, reduce the operating cost of the SPE water electrolysis cell, and is of great significance for promoting the marketization process of the SPE electrolysis cell.

Claims (6)

1. an in situ regeneration method for solid polymer electrolyte water electrolytic cell, is characterized in that: willThe cleaning solution of 0.1～5mol/L passes into solid polymer electrolyte (SPE) water electrolytic cell, cleans 0.01-30h,Repeat 1～10 time, then clean again 0.1～30h by pure water or deionized water, repeat 1～10 time, can be extensiveThe performance of multiple electrolytic cell;

Described cleaning solution is acid solution or alkaline solution, and acid solution is selected from H₂O₂The aqueous solution, hydrochloric acidOne or more in the aqueous solution, aqueous sulfuric acid or aqueous solution of nitric acid, alkaline solution be selected from ammoniacal liquor,One or more in sodium hydrate aqueous solution, potassium hydroxide aqueous solution.

2. according in situ regeneration method claimed in claim 1, it is characterized in that: when the cleaning of cleaning solutionBetween be preferably 0.1～30h, wash number is preferably 1～5 time.

3. according in situ regeneration method claimed in claim 1, it is characterized in that: pure water or deionized waterScavenging period is preferably 0.1～20h, repeats 1-5 time;

Or, first wash 0.1～0.5h by pure water or deionized water, repeat 1-5 time, then with pure water or goIonized water cleans 0.1～10h, repeats 1～5 time.

4. according in situ regeneration method claimed in claim 1, it is characterized in that: cleaning solution cleans solid-stateThe condition of polymer dielectric (SPE) water electrolytic cell is preferably: the cleaning solution of 0.1～5mol/L, cleans0.1～10h, repeats 1～5 time;

Or the cleaning solution of 0.1～3mol/L, cleans 0.1～24h, repeats 1～5 time.

5. according in situ regeneration method claimed in claim 1, it is characterized in that: described cleaning way isCleaning solution is cleaned through water electrolytic cell with pump circulation, or cleaning solution is passed into water electrolytic cell soaking and washing,Or cleaning solution is passed into water electrolytic cell circulation or static immersing cleaning with siphonage.

6. according to the arbitrary described in situ regeneration method of claim 1-5, it is characterized in that: when cleaning, clearDilution while or separately anode cavities and the cathode cavity of rinse water electrolytic cell, more same with pure water or deionized waterShi Qingxi anode and cathode chamber.