PEM current collector reinforced life test device

Abstract

The invention belongs to the technical field of water electrolysis hydrogen production, and particularly relates to an electrode reinforced life detection device. A PEM current collector reinforced life testing device comprises an electrolytic reaction tank, a water bath kettle, a water replenishing device and a control power supply, an electrode sample to be detected and the inert cathode are positioned in the electrolytic reaction tank, and a water supplementing opening is formed in the electrolytic reaction tank; the electrolytic reaction tank is located in the water bath kettle, and the water bath kettle provides a constant preset temperature environment for the electrolytic reaction tank; the water replenishing device is used for replenishing electrolyzed water to the electrolytic reaction tank through a flow meter; the control power supply is respectively connected with the to-be-detected electrode sample and the inert cathode to provide constant current for the to-be-detected electrode sample and the inert cathode, so that an electrolytic process is formed in the electrolytic reaction tank, and a voltage value is detected in the electrolytic process. And judging the service life of the current collector according to the voltage difference and the electrolysis process time, thereby optimizing the coating thickness of the current collector and reducing the manufacturing cost of the electrolytic cell.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen production by water electrolysis, and in particular relates to an enhanced life detection device for an electrode. Background Art

[0002] The development of clean and efficient renewable energy is an inevitable trend in future energy transformation. Hydrogen energy, as a green and pollution-free energy carrier, can achieve efficient conversion of hydrogen energy and electrical energy through water electrolysis technology, and is expected to be used as an important means of regulating wind and photovoltaic power generation. Hydrogen production by water electrolysis using ion exchange membranes can increase current density and energy conversion efficiency, which is better than hydrogen production by water electrolysis using alkaline aqueous solutions.

[0003] The electrolysis of water is of great significance in the preparation of clean energy. In recent years, pure water electrolysis (PEM) hydrogen production technology mainly relies on the high catalytic activity of precious metals. As an important component of the pure water electrolyzer, the life of the current collector determines the service life of the water electrolysis device. Research on the effect of coating thickness on the life of the current collector and optimizing the coating thickness so that the current collector obtains the most optimized thickness of coating is of great significance to improving its service life and reducing the preparation cost. At present, there is no clear PEM current collector life test device. Summary of the invention

[0004] The purpose of the present invention is to provide a PEM current collector enhanced life test device to explore the service life of current collectors with different coating thicknesses.

[0005] The technical solution of the present invention is: a PEM current collector enhanced life test device, comprising: an electrolytic reaction tank, a water bath, a water replenishing device and a control power supply.

[0006] The electrode sample to be tested and the inert cathode are located in an electrolytic reaction tank, and a water supply port is provided on the electrolytic reaction tank.

[0007] The electrolytic reaction tank is located in a water bath, and the water bath provides a constant preset temperature environment for the electrolytic reaction tank.

[0008] The water replenishment device replenishes the electrolytic reaction tank with electrolyzed water through a flow meter. The flow meter replenishes the electrolytic reaction tank with water consumed by electrolysis to keep the electrolyte concentration in the electrolytic tank constant. The speed of the flow meter is regulated according to the speed of water consumption by electrolysis.

[0009] The control power supply is connected to the electrode sample to be tested and the inert cathode respectively to provide a constant current therefor, so that an electrolysis process is formed in the electrolysis reaction tank, and the voltage value is detected during the electrolysis process; the voltage value can be used as a basis for the enhanced life of the electrode sample to be tested.

[0010] During the test: a constant direct current of the control power supply is provided to the electrode sample to be tested and the inert cathode, so that the electrolysis reaction tank forms an electrolysis process; when the constant current is provided to the electrode sample to be tested and the inert cathode, the test time and voltage change are recorded; after the test time is reached, the constant current is stopped, the voltage value is stopped from being detected, and the test end time is recorded; the difference between the test end time and the test start time is used as the enhanced life test time of the electrode sample to be tested.

[0011] If the voltage at the initial stage of the experiment suddenly starts to rise in a short period of time after a period of time, it can be judged that the platinum layer of the collector has begun to fall off and be damaged. When the voltage rises to a certain value and no longer changes, it is judged that the platinum coating has completely lost its protective and conductive functions, and its life is over. The process time is different for platinum layers of different thicknesses, and the time for the voltage to rise initially and in a short period of time and to remain unchanged in the end is different. The life of the collector can be judged based on the voltage difference and process time.

[0012] In the above scheme, further, the electrolytic reaction tank is equipped with a sealing cover, on which a gas outlet, a water supply port, and a slot for installing the electrode sample to be tested and an inert cathode are provided.

[0013] In the above scheme, further, the electrode sample to be tested adopts a multi-layer mesh titanium-based material, and is connected to a control power supply through a wire and a sawtooth clamp.

[0014] In the above scheme, further, the water replenishing device includes: a base, a water tank arranged on the base, and a flow meter installed on the bracket; the flow meter is connected to the water tank through a U-shaped tube, and a flow control valve is provided below the flow meter.

[0015] In the above scheme, further, there are multiple electrode samples to be tested and multiple inert cathodes, each electrode to be tested corresponds to an inert cathode, and each electrode sample to be tested and the inert cathode form an electrode group.

[0016] Beneficial effects:

[0017] (1) The present invention provides a constant direct current of a control power supply to the electrode sample to be tested and the inert cathode, so that an electrolysis process is formed in the electrolysis reaction cell; the test time and voltage change are recorded during the electrolysis process; after the test time is reached, the constant current is stopped from being provided, the voltage value is stopped from being detected, and the test end time is recorded; the difference between the test end time and the test start time is used as the enhanced life test time of the electrode sample to be tested, and the life of the collector is determined according to the voltage difference and the process time, thereby optimizing the collector coating thickness and reducing the manufacturing cost of the electrolytic cell.

[0018] (2) The present invention adopts a stable water replenishing device to ensure that the concentration of the electrolyte in the electrolytic cell is always maintained at the initial concentration, so that the electrode detection working environment is stable and the reliability of the detection is improved.

[0019] (3) The present invention sets a slot on the electrolytic reaction tank, which makes it easy to replace different electrode samples, has good repeatability and reliability, and is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the electrolytic reaction tank in the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the water bath pot in the present invention;

[0023] Figure 4 It is a structural schematic diagram of the water replenishment device in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the control power supply in the present invention;

[0025] In the figure: 101-electrolysis reaction tank, 102-electrode sample to be tested, 103-inert cathode, 104-water supply port, 201-water bath, 301-base, 302-water tank, 303-U-tube, 304-flow meter, 305-flow control valve, 306-bracket, 401-control power supply. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] See attached Figure 1 This embodiment provides a PEM current collector enhanced life test device, including: an electrolytic reaction tank 101, a water bath 201, a water replenishing device and a control power supply 401.

[0028] See attached Figure 2 The electrolytic reaction tank 101 is provided with a sealing cover, on which a gas outlet, a water supply port 104, and a slot for installing the electrode sample 102 to be tested and the inert cathode 103 are provided. The electrode sample 102 to be tested and the inert cathode 103 are located in the electrolytic reaction tank 101. The electrode sample 102 to be tested is made of a multi-layer mesh titanium-based material, and is connected to the control power supply 401 through a wire and a serrated clamp. The number of the electrode sample 102 to be tested and the inert cathode 103 is one or more, each electrode 102 to be tested corresponds to an inert cathode 103, and each electrode sample to be tested and the inert cathode form an electrode group.

[0029] See attached Figure 3 The electrolytic reaction tank 101 is located in a water bath 201 , and the water bath 201 provides a constant preset temperature environment for the electrolytic reaction tank 101 .

[0030] See attached Figure 4 , the water replenishing device replenishes the electrolyzed water to the electrolysis reaction tank 101 through the flow meter 304. The flow meter 304 replenishes the water consumed by electrolysis to the electrolysis reaction tank 101, keeps the electrolyte concentration in the electrolysis tank unchanged, and the speed of the flow meter 304 is adjusted according to the speed of water consumption by electrolysis. The water replenishing device includes: a base 301, a water tank 302 arranged on the base 301, and a flow meter 304 installed on a bracket 306; the flow meter 304 is connected to the water tank 302 through a U-shaped tube 303, and a flow control valve 305 is provided below the flow meter 304.

[0031] See attached Figure 5 The control power supply 401 is connected to the electrode sample 102 to be tested and the inert cathode 103 respectively to provide a constant current therefor, so that an electrolysis process is formed in the electrolysis reaction tank 101, and the voltage value is detected during the electrolysis process; the voltage value can be used as a basis for the enhanced life of the electrode sample to be tested.

[0032] During the test: a constant direct current of the control power supply 401 is provided to the electrode sample to be tested 102 and the inert cathode 103, so that the electrolysis reaction tank 101 forms an electrolysis process; when the constant current is provided to the electrode sample to be tested 102 and the inert cathode 103, the test time and voltage change are recorded; after the test time is reached, the constant current is stopped, the voltage value is stopped from being detected, and the test end time is recorded; the difference between the test end time and the test start time is used as the enhanced life test time of the electrode sample to be tested.

[0033] The test steps are:

[0034] Step 1: Place the electrode sample 102 to be tested and the inert cathode 103 in an electrolytic reaction tank 101 filled with electrolyte of a certain concentration, and connect the electrode sample 102 to be tested and the inert cathode 103 to the positive and negative electrodes of the control power supply 401 respectively.

[0035] Step 2: Fill the water bath 201 with pure water and set the experimental temperature.

[0036] Step 3: Fill the flow meter 304, the water tank 302 and the U-shaped tube 303 with pure water, and the flow control valve 305 dynamically replenishes water into the electrolytic reaction tank 101 according to the electrolysis rate to keep the electrolyte concentration consistent.

[0037] Step 4: After steps 1, 2 and 3 are prepared and the preset parameters are reached, turn on the control power supply 401, debug the experimental parameters and turn on the switch to conduct the experiment.

[0038] If the voltage at the initial stage of the experiment suddenly starts to rise in a short period of time after a period of time, it can be judged that the platinum layer of the collector has begun to fall off and be damaged. When the voltage rises to a certain value and no longer changes, it is judged that the platinum coating has completely lost its protective and conductive functions, and its life is over. The process time is different for platinum layers of different thicknesses, and the time for the voltage to rise initially and in a short period of time and to remain unchanged in the end is different. The life of the collector can be judged based on the voltage difference and process time.

[0039] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A PEM current collector enhanced life test device, characterized in that: include: An electrolytic reaction tank (101), a water bath (201), a water replenishing device and a control power supply (401); The electrode sample (102) to be tested and the inert cathode (103) are located in the electrolytic reaction tank (101), and a water supply port (104) is provided on the electrolytic reaction tank (101); The electrolytic reaction tank (101) is located in the water bath (201), and the water bath (201) provides a constant preset temperature environment for the electrolytic reaction tank (101); The water replenishing device replenishes the electrolyzed water to the electrolysis reaction tank (101) through a flow meter (304); The control power supply (401) is respectively connected to the electrode sample to be tested (102) and the inert cathode (103) to provide a constant current thereto, so that an electrolysis process is formed in the electrolysis reaction tank (101), and a voltage value is detected during the electrolysis process.

2. A PEM current collector enhanced life test device as claimed in claim 1, characterized in that: The electrolytic reaction tank (101) is provided with a sealing cover, on which a gas outlet, a water supply port (104), and a slot for installing the electrode sample to be tested (102) and the inert cathode (103) are provided.

3. A PEM current collector enhanced life test device as claimed in claim 1 or 2, characterized in that: The electrode sample (102) to be tested is made of a multi-layer mesh titanium-based material and is connected to the control power supply (401) via a wire and a sawtooth clamp.

4. A PEM current collector enhanced life test device as claimed in claim 1 or 2, characterized in that: The water replenishment device comprises: a base (301), a water tank (302) arranged on the base (301), and the flow meter (304) installed on a bracket (306); the flow meter (304) is connected to the water tank (302) through a U-shaped tube (303), and a flow control valve (305) is provided below the flow meter (304).

5. A PEM current collector enhanced life test device as claimed in claim 1 or 2, characterized in that: The number of the electrode samples (102) to be tested and the number of the inert cathodes (103) are multiple.

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