Electrochemical flow cell and electrochemical mass spectrum liquid sample injection detection device
By designing an electrochemical flow cell with fluid channels with elongated and extended segments and temperature monitoring components, the problems of large dead volume, poor sealing and inability to monitor the electrolyte reaction temperature in the existing electrochemical reaction cell device are solved, and more efficient and accurate electrochemical reactions are achieved.
Patent Information
- Application Number
- CN202421250061.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-06-03
AI Technical Summary
The existing electrochemical reaction cell devices have problems such as large volume of fluid, poor sealing, difficulty in replacing working electrodes, and inability to monitor the reaction temperature of the electrolyte.
An electrochemical flow cell is designed, including a block body, a fluid inlet, a fluid outlet, a fluid passage, a bore and a temperature monitoring assembly. The fluid channel is arranged through elongated and expanded sections, reducing the dead volume of the electrolyte; the temperature monitoring component is used to monitor and control the electrolyte temperature in real time; the channel design facilitates the disassembly and installation of working electrodes, improving sealing.
It improves the dead volume of the fluid, improves the sealing and convenient replacement of working electrodes, while real-time monitoring and control of the electrolyte reaction temperature is achieved, improving the efficiency and accuracy of the electrochemical reaction.
Smart Images
Figure CN223022021U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of a detection device for metal dissolution of an oxygen reduction catalyst in a fuel cell, and particularly relates to an electrochemical flow cell for providing an electrochemical reaction environment. Background Art
[0002] A fuel cell is used to directly convert chemical energy into electrical energy. Among them, the oxygen reduction reaction is a key reaction in the fuel cell. The electrochemical reaction cell provides an electrochemical reaction environment for the oxygen reduction reaction. Existing electrochemical reaction cell devices have problems such as a large fluid dead volume due to a large reaction cavity, poor sealing, difficulty in replacing a working electrode, and inability to monitor the reaction temperature of the electrolyte. Summary of the Utility Model
[0003] In order to improve the defects of the existing technology, the utility model provides an electrochemical flow cell, which includes a block body, and the block body is provided with:
[0004] A fluid inlet and a fluid outlet, which are respectively used for the electrolyte to flow into and out of the block body;
[0005] A fluid channel, which is located inside the block body and is used for fluid to connect the fluid inlet and the fluid outlet; and
[0006] A first channel, a second channel and a third channel, all of which intersect with the fluid channel, and a working electrode, a reference electrode and a counter electrode are respectively accommodated therein. One ends of the working electrode, the reference electrode and the counter electrode all extend into the fluid channel.
[0007] In some embodiments, a temperature monitoring component is provided inside the block body for monitoring the temperature inside the block body.
[0008] In some embodiments, the temperature monitoring component is arranged adjacent to the fluid channel.
[0009] In some embodiments, the electrochemical flow cell further includes a controller, and the controller is configured to:
[0010] When the temperature monitoring component monitors that the temperature inside the block body is lower than the target temperature, issue an instruction to heat the temperature of the electrolyte flowing into the block body; and
[0011] When the temperature monitoring component monitors that the temperature inside the block body is higher than the target temperature, issue an instruction to reduce the temperature of the electrolyte flowing into the block body.
[0012] In some embodiments, the fluid channel includes an elongated section, the cross-sectional area of the elongated section is smaller than the rest of the fluid channel, and the first channel and the second channel intersect with the elongated section.
[0013] In some embodiments, the depth of the elongated section is smaller than the rest of the fluid channel.
[0014] In some embodiments, the depth of the slender section is about 1 mm.
[0015] In some embodiments, the fluid channel has a first enlarged diameter section and a second enlarged diameter section, which are respectively communicated with the fluid inlet and the fluid outlet. The slender section communicates the first enlarged diameter section and the second enlarged diameter section. The second cavity block is provided with a third channel, and the first enlarged diameter section and the second enlarged diameter section are arranged at an angle with the slender section.
[0016] In some embodiments, the working electrode and the reference electrode are respectively detachably and sealingly installed in the first channel and the second channel, and the counter electrode is sealingly and fixedly installed in the third channel.
[0017] In some embodiments, the block body includes a first cavity block and a second cavity block that are detachably stacked. The first cavity block is located at the top and the second cavity block is located at the bottom.
[0018] In some embodiments, the fluid channel is formed on the side surface of the second cavity block adjacent to the first cavity block.
[0019] In some embodiments, the first cavity block is provided with a first channel and a second channel, and the second cavity block is provided with a fourth channel, and a temperature monitoring component is accommodated in the fourth channel.
[0020] In some embodiments, the working electrode is configured to be applicable to the electrode of an RDE detection device.
[0021] The present utility model also provides an electrochemical mass spectrometry liquid injection detection device for detecting the mass of catalyst metal dissolution products in a fuel cell electrolyte, including the above-mentioned electrochemical flow cell.
[0022] Through the electrochemical reaction cell of the present utility model, at least one of the problems of excessive fluid dead volume, poor sealing performance, difficult electrode replacement, and inability to monitor the solution temperature caused by a large reaction cavity is improved. Description of the Drawings
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0024] Figure 1 A schematic diagram showing an electrochemical reaction cell according to an exemplary embodiment of the present utility model;
[0025] Figure 2 Shown Figure 1 An exploded schematic diagram of the shown electrochemical reaction cell;
[0026] Figure 3 Front view showing the second cavity block with fluid channels;
[0027] Figure 4 Top view showing the second cavity block with fluid channels;
[0028] Figure 5 Bottom view showing the second cavity block with fluid channels; and
[0029] Figure 6 shows a cross-sectional view of the second cavity block taken along line a-a in Figure 3 .
[0030] Reference numerals: 1, block body; 10, first cavity block; 11, first channel; 12, second channel; 20, second cavity block; 21, temperature monitoring assembly; 22, counter electrode; 25, fluid channel; 111, first seal; 121, second seal; 220, third channel; 210, fourth channel; 221, carbon rod; 222, copper rod; 231, fluid inlet; 241, fluid outlet; 251, first enlarged diameter section; 252, slender section; 253, second enlarged diameter section. Detailed Description of the Invention
[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.
[0032] The present invention provides an electrochemical flow cell, such as Figure 1 , 2, as shown in FIGS. 4 and 5, the electrochemical flow cell includes a block body 1, and the block body 1 is provided with a fluid inlet 231, a fluid outlet 241, a fluid channel 25, a first channel 11, a second channel 12 and a third channel 220; the fluid inlet 231 and the fluid outlet 241 are respectively used for the electrolyte to flow into and out of the block body 1. The fluid channel 25 is arranged inside the block body 1 and is used for fluidly connecting the fluid inlet 231 and the fluid outlet 241, so that the electrolyte flows from the fluid inlet 231 to the fluid outlet 241 inside the block body 1; the first channel 11, the second channel 12 and the third channel 220 all intersect with the fluid channel 25 and are respectively used for accommodating a working electrode, a reference electrode and a counter electrode 22. One ends of the working electrode, the reference electrode and the counter electrode 22 extend into the fluid channel 25 to contact the electrolyte in the fluid channel 25 for electrochemical reaction. The working electrode and the reference electrode are respectively detachably installed in the first channel 11 and the second channel 12, and the counter electrode 22 is fixedly installed in the third channel 220; for example, a platinum-carbon electrode can be used as the working electrode; the counter electrode 22 can be composed of a carbon rod 221 and a copper rod 222.
[0033] In some embodiments, a temperature monitoring component 21 is provided inside the block body 1, and the temperature monitoring component 21 is used for monitoring the temperature inside the block body 1. The temperature inside the block body 1 can be any desired temperature by controlling the temperature of the electrolyte flowing into the block body 1, which ensures that electrochemical reactions can be carried out at different temperatures, so as to obtain the mass of the catalyst metal dissolution product on the working electrode through electrochemical reactions at different temperatures.
[0034] In some embodiments, the electrochemical flow cell includes a controller. When the temperature monitoring component 21 monitors that the temperature inside the block body 1 is lower than the target temperature, the controller issues an instruction to heat the temperature of the electrolyte flowing into the block body 1. By increasing the temperature of the electrolyte flowing into the block body 1, the temperature inside the block body 1 is raised to the target temperature; when the temperature monitoring component 21 monitors that the temperature inside the block body 1 is higher than the target temperature, the controller issues an instruction to reduce the temperature of the electrolyte flowing into the block body 1. By reducing the temperature of the electrolyte flowing into the block body 1, the temperature inside the block body 1 is reduced to the target temperature. In this way, the mass of the catalyst metal dissolution product on the working electrode at different temperatures can be measured conveniently, efficiently and accurately, and the influence of the catalyst metal dissolution product on the performance of the fuel cell can be accurately evaluated.
[0035] In some embodiments, the temperature monitoring component 21 is arranged adjacent to the fluid channel 25 in the block body 1, which is beneficial to accurately monitoring the temperature of the electrolyte to undergo electrochemical reaction in the fluid channel 25 and is beneficial to evaluating the influence of the catalyst metal dissolution product on the performance of the fuel cell.
[0036] In some embodiments, such as Figure 3As shown, the fluid channel 25 includes multiple flow path segments, and the multiple flow path segments include an elongated segment 252. The cross-sectional area of the elongated segment 252 is smaller than the rest of the fluid channel 25. Both the first channel 11 and the second channel 12 intersect the elongated segment 252, such that the working electrode located in the first channel 11 and the reference electrode located in the second channel 12 come into contact with the electrolyte in the elongated segment 252 to undergo an electrochemical reaction. Since the cross-sectional area of the elongated segment 252 is smaller than other parts of the fluid channel 25, the electrolyte in the elongated segment 252 is substantially flowing, and thus there is basically no dead volume of the electrolyte formed on the elongated segment 252.
[0037] In some embodiments, to ensure the accuracy of the test, it is necessary to ensure that once the electrochemical reaction stops, the dissolution of the electrolyte metal also stops. The inventor has found that when the depth of the elongated segment 252 is relatively shallow, the accuracy of the test is relatively high. For example, when the depth of the elongated segment 252 is about 1 mm, when the electrochemical reaction stops, the dissolution of the catalyst metal on the working electrode also stops synchronously. Thus, it is ensured that the dissolution products of the catalyst metal on the working electrode are basically formed during the electrochemical reaction, and no dissolution products of the catalyst metal are formed after the electrochemical reaction ends, so that the mass of the detected dissolution products of the catalyst metal is accurate.
[0038] In some embodiments, as Figure 2 shown, the working electrode and the reference electrode are respectively detachably and fluid-tightly installed in the first channel 11 and the second channel 12. On the one hand, this facilitates the replacement and repair of the working electrode and the reference electrode. On the other hand, it avoids the leakage of the electrolyte from the corresponding channels, improving the liquid tightness of the block body 1. For example, the working electrode, the reference electrode, and the counter electrode 22 can be installed in the corresponding channels by means of a sealed connection, and a first seal 111 and a second seal 121 are respectively provided between the working electrode and the reference electrode and the corresponding channels.
[0039] In some embodiments, as Figure 1 shown, the block body 1 includes a first cavity block 10 and a second cavity block 20. The first cavity block 10 and the second cavity block 20 are detachably connected together by fasteners such as bolts. Optionally, as Figure 1 and 2 shown, the first channel 11 and the second channel 12 are provided on the first cavity block 10, and the third channel 220 is provided on the second cavity block 20. Optionally, the first channel 11, the second channel 12, and the third channel 220 can be provided on either the first cavity block 10 or the second cavity block 20.
[0040] In some embodiments, as Figure 2 、 4As shown in FIGS. 5 and 6, a fluid passage 25 is formed on a side of the second cavity block 20 adjacent to the first cavity block 10. The fluid passage 25 includes a first enlarged diameter section 251, an elongated section 252, and a second enlarged diameter section 253. The elongated section 252 communicates with the first enlarged diameter section 251 and the second enlarged diameter section 253. The first enlarged diameter section 251 and the second enlarged diameter section 253 communicate with a fluid inlet 231 and a fluid outlet 241 respectively. The cross-sectional areas of the first enlarged diameter section 251 and the second enlarged diameter section 253 are larger than that of the elongated section 252.
[0041] In some embodiments, as Figure 1 and 2 shown, the second cavity block 20 is provided with a fourth channel 210, and a temperature monitoring component 21 is accommodated in the fourth channel 210.
[0042] In some embodiments, the third channel 220 intersects with the first enlarged diameter section 251, such that the third channel 220 is in fluid communication with the first enlarged diameter section 251, and the counter electrode 22 accommodated in the third channel 220 contacts the electrolyte in the first enlarged diameter section 251.
[0043] In some embodiments, the first cavity block 10 and the second cavity block 20 are detachably stacked, with the first cavity block 10 at the top and the second cavity block 20 at the bottom. Replacing the working electrode and the reference electrode accommodated in the first cavity block 10 from the top is beneficial for replacement and maintenance.
[0044] In some embodiments, the working electrode is also applicable to an RDE (Rotating Disk Electrode) detection device, such that after an electrochemical reaction is performed on the working electrode, it can be installed on the RDE detection device to continue detecting the mass specific activity of the catalyst, the electrochemically specific surface area, etc., thereby improving the continuity and applicability of the detection.
[0045] The present utility model also provides an electrochemical mass spectrometry liquid injection detection device for detecting the mass of catalyst metal leachates in a fuel cell electrolyte, including the above-mentioned electrochemical flow cell.
[0046] The above are only exemplary embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. An electrochemical flow cell, characterized in that The invention comprises a block body (1), wherein the block body (1) is provided with: a fluid inlet (231) and a fluid outlet (241), for electrolyte to flow into and out of the block body (1), respectively; a fluid channel (25), located inside the block body (1), for fluidly connecting the fluid inlet (231) and the fluid outlet (241); and The first channel (11), the second channel (12) and the third channel (220) all intersect with the fluid channel (25) and respectively accommodate a working electrode, a reference electrode and a counter electrode (22) therein, and one end of the working electrode, the reference electrode and the counter electrode (22) all extend into the fluid channel (25).
2. The electrochemical flow cell according to claim 1, characterized in that A temperature monitoring component (21) is provided inside the block body (1) for monitoring the temperature inside the block body (1).
3. The electrochemical flow cell according to claim 2, characterized in that: The temperature monitoring assembly (21) is arranged adjacent to the fluid channel (25).
4. The electrochemical flow cell according to claim 2, characterized in that: Also included is a controller, the controller being configured to: When the temperature monitoring component (21) detects that the internal temperature of the block body (1) is lower than the target temperature, an instruction is issued to heat the temperature of the electrolyte flowing into the block body (1); and When the temperature monitoring component (21) detects that the internal temperature of the block body (1) is higher than the target temperature, an instruction is issued to reduce the temperature of the electrolyte flowing into the block body (1).
5. The electrochemical flow cell according to claim 1, characterized in that: The fluid channel (25) includes an elongated section (252) having a cross-sectional area smaller than the remaining portion of the fluid channel (25), and the first hole (11) and the second hole (12) intersect the elongated section (252).
6. The electrochemical flow cell according to claim 5, characterized in that The elongated section (252) has a depth less than the remainder of the fluid channel (25).
7. The electrochemical flow cell according to claim 6, characterized in that: The elongated section (252) has a depth of about 1 mm.
8. The electrochemical flow cell according to claim 5, characterized in that The fluid channel (25) has a first diameter expansion section (251) and a second diameter expansion section (253), which are respectively connected to the fluid inlet (231) and the fluid outlet (241); the slender section (252) is connected to the first diameter expansion section (251) and the second diameter expansion section (253); the first diameter expansion section (251) and the second diameter expansion section (253) are arranged at an angle to the slender section (252).
9. The electrochemical flow cell according to claim 2, characterized in that: The block body (1) comprises a first cavity block (10) and a second cavity block (20) which are detachably stacked, wherein the first cavity block (10) is located at the top, the second cavity block (20) is located at the bottom, and the second cavity block (20) is provided with the third channel (220).
10. The electrochemical flow cell according to claim 9, characterized in that: The working electrode and the reference electrode are detachably and hermetically installed in the first channel (11) and the second channel (12), respectively, and the counter electrode (22) is hermetically fixedly installed in the third channel (220).
11. The electrochemical flow cell according to claim 9, characterized in that: The fluid channel (25) is formed on a side of the second chamber block (20) adjacent to the first chamber block (10).
12. The electrochemical flow cell according to claim 9, characterized in that: The first cavity block (10) is provided with the first hole (11) and the second hole (12), and the second cavity block (20) is provided with a fourth hole (210), wherein the temperature monitoring component (21) is accommodated in the fourth hole (210).
13. The electrochemical flow cell according to claim 1, characterized in that: The working electrode is configured to be suitable for use in an RDE detection device.
14. An electrochemical mass spectrometry liquid sampling detection device, characterized in that: Used for detecting the quality of catalyst metal dissolution in fuel cell electrolyte, comprising the electrochemical flow cell described in any one of claims 1-13.