Electrode and electrochemical sensor
By opening a fixing groove on the inner wall of the electrode housing and fixing the semi-permeable membrane on the electrode, the problem of using additional fixing components in the prior art is solved, and stable fixation and cost savings of the semi-permeable membrane are achieved.
Patent Information
- Application Number
- CN202420548465.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-18
AI Technical Summary
Existing electrodes require additional fixing components when fixing semipermeable membranes, resulting in increased costs and complex fixing processes.
By opening a fixing groove on the inner wall of the electrode housing, the semi-permeable membrane is fixed to the housing, avoiding the use of additional fixing components.
The stable fixation of the semipermeable membrane is achieved, simplifies the fixation process and helps save the cost of the semipermeable membrane.
Smart Images
Figure CN222529276U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of electrochemical sensors, and in particular, to an electrode and an electrochemical sensor. Background Art
[0002] In scientific research and engineering applications, electrodes, as an important electrochemical tool, are widely used in electrochemical analysis, electrodeposition, electrosynthesis and electrolysis. Most electrodes for measuring electrolyte parameters use ion-selective electrodes. Ion-selective electrodes can convert changes in the activity of specific ions in the solution into changes in electrode potential. The key part of the electrode is the ion-selective membrane, which contacts the sample on one side and responds to changes in the electrolyte concentration in the sample, and contacts the liquid in the electrode on the other side. Then, through a silver rod coated with silver chloride, the transition from ion conduction to electronic conduction is achieved, which is called an internal conduction electrode. In addition, there is a reference electrode, which is used to provide a reference potential to form a complete measurement circuit. When the electrolyte concentration in the solution changes, the potential of the reference electrode remains unchanged, thus providing a reference point for measuring the potential difference.
[0003] Ion selective membrane, also known as semipermeable membrane, is one of the key components of the electrode; it requires stable chemical properties, both considerable sealing and uniform permeability to ensure the channel for conductivity and ion exchange during the measurement process. Existing semipermeable membranes usually need to be fixed to the housing of the electrode with the help of additional fixing components. Utility Model Content
[0004] The embodiment of the present application provides an electrode, which can fix the semipermeable membrane on the shell of the electrode through the fixing groove, without the need for additional fixing components to fix the semipermeable membrane.
[0005] In a first aspect of the present application, an electrode is provided, the electrode comprising: a shell, the shell having a detection hole, a liquid storage cavity provided in the shell, the liquid storage cavity being connected to the external environment through the detection hole, and the liquid storage cavity being used to accommodate an internal filling liquid; a silver-silver chloride electrode, the silver-silver chloride electrode being installed in the shell, one end of the silver-silver chloride electrode being used to be connected to an external circuit, and the other end of the silver-silver chloride electrode being inserted into the liquid storage cavity and being used to contact the internal filling liquid; a fixing groove, the fixing groove being provided on the inner wall of the shell, the fixing groove being provided between the liquid storage cavity and the detection hole, and the fixing groove being connected to the liquid storage cavity and the detection hole; a semipermeable membrane, the semipermeable membrane being provided in the fixing groove, the semipermeable membrane being fixed to the shell through the fixing groove, the semipermeable membrane being used to block a connection path between the liquid storage cavity and the detection hole, one side surface of the semipermeable membrane being used to contact the internal filling liquid, and the other side surface of the semipermeable membrane being used to contact the liquid to be tested input from the detection hole.
[0006] In an embodiment of the present application, a fixing groove is provided on the inner wall of the housing of the electrode, and the fixing groove is provided between the liquid storage cavity and the detection hole, and the fixing groove is connected to the liquid storage cavity and the detection hole; a semipermeable membrane is provided in the fixing groove, and the semipermeable membrane is fixed to the housing through the fixing groove, and the semipermeable membrane is used to block the connection path between the liquid storage cavity and the detection hole, and one side surface of the semipermeable membrane is used to contact the internal filling liquid in the liquid storage cavity, and the other side surface of the semipermeable membrane is used to contact the liquid to be tested input from the detection hole. The embodiment of the present application can fix the semipermeable membrane on the housing of the electrode through the fixing groove, without the need to fix the semipermeable membrane with the aid of an additional fixing component, which is conducive to saving the cost of the semipermeable membrane.
[0007] In some embodiments, the semipermeable membrane is a polymer-based semipermeable membrane, and the membrane-forming liquid of the polymer-based semipermeable membrane is solidified and formed in the fixing tank to form the polymer-based semipermeable membrane.
[0008] In some embodiments, the electrode further comprises a reinforcement groove, wherein the reinforcement groove is opened on a side wall of the fixing groove, and the reinforcement groove is used to strengthen the connection strength between the semipermeable membrane and the shell.
[0009] In some embodiments, the shell is further provided with a plurality of sampling holes connected with the detection hole, and the plurality of sampling holes are connected with each other, the sampling holes are used to collect the liquid to be tested, and the liquid to be tested enters the detection hole through the sampling holes.
[0010] In some embodiments, the shell is further provided with a shell mounting through hole, and the liquid storage chamber is connected to the external environment through the shell mounting through hole; the electrode also includes: a metal contact, the metal contact is inserted into the shell mounting through hole, and the metal contact is used to connect the silver-silver chloride electrode with an external circuit.
[0011] In some embodiments, the metal contacts are gold-plated metal contacts.
[0012] In some embodiments, the shell is further provided with a fluid exchange port, the fluid exchange port is communicated with the fluid storage chamber, and the fluid exchange port is used to introduce the internal filling fluid into or discharge the fluid storage chamber.
[0013] In some embodiments, the electrode further comprises a sealing cover matching the fluid exchange port, and the sealing cover is used to control the opening and closing of the fluid exchange port.
[0014] In a second aspect of the present application, an electrochemical sensor is provided. The electrochemical sensor comprises a controller and the electrode described in the first aspect, wherein the controller is connected to the electrode.
[0015] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the present application, nor are they intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 is a schematic structural diagram of an electrode provided by some embodiments of the present application from a perspective;
[0018] Figure 2 is a schematic structural diagram of an electrode from one perspective provided in other embodiments of the present application;
[0019] Figure 3 It is a schematic diagram of the hardware structure of the electrochemical sensor provided in some embodiments of the present application. DETAILED DESCRIPTION
[0020] The principles and spirit of the present disclosure will be described below with reference to several exemplary embodiments shown in the accompanying drawings. It should be understood that the description of these specific embodiments is only to enable those skilled in the art to better understand and implement the present disclosure, and does not limit the scope of the present disclosure in any way. In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the meanings commonly understood by those of ordinary skill in the art.
[0021] As used herein, the term "including" and similar terms should be understood as open inclusion, i.e., "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same objects, and are only used to distinguish the objects referred to, and do not imply a specific spatial order, temporal order, or order of importance of the objects referred to.
[0022] For example, Figure 1 The schematic diagram of the structure of the electrode provided in the embodiment of the present application is shown. Figure 1As shown, the electrode 100 includes a shell 11, the shell 11 is provided with a detection hole 12, a liquid storage chamber 13 is arranged in the shell 11, the liquid storage chamber 13 is connected to the external environment through the detection hole 12, and the liquid storage chamber 13 is used to accommodate an internal filling liquid, such as a potassium chloride solution; the electrode 100 also includes a silver-silver chloride electrode 14. The internal filling liquid is used to maintain the exchange current signal between the silver-silver chloride electrode 14 and the liquid to be tested. The silver-silver chloride electrode 14 is installed in the shell 11, one end of the silver-silver chloride electrode 14 is used to connect to an external circuit, and the other end of the silver-silver chloride electrode 14 is inserted into the liquid storage chamber 13 and is used to contact the potassium chloride solution in the liquid storage chamber 13. The silver-silver chloride electrode 14 includes a silver rod and a silver chloride layer coated on the surface of the silver rod.
[0023] The inner wall of the shell 11 is also provided with a fixed groove 15; wherein, the inner wall of the shell 11 encloses the liquid storage chamber 13. The fixed groove 15 is provided between the liquid storage chamber 13 and the detection hole 12, and the fixed groove 15 is connected with the liquid storage chamber 13 and the detection hole 12. A semipermeable membrane 16 is provided in the fixed groove 15, and the fixed groove 15 is used to fix the semipermeable membrane 16 to the shell 11, and the semipermeable membrane 16 is used to block the connection path between the liquid storage chamber 13 and the detection hole 12, and one side surface of the semipermeable membrane 16 is used to contact with the inner filling liquid, and the other side surface of the semipermeable membrane 16 is used to contact with the liquid to be tested input from the detection hole 12. The semipermeable membrane 16 has a suitable molecular weight cut-off, which can control the precipitation rate of the inner filling liquid to the greatest extent without affecting the potential exchange between the inner filling liquid (that is, potassium chloride solution) and the liquid sample, and prolong the saturation time of the inner filling liquid. The fixed groove 15 can be any suitable shape, such as circular, elliptical and polygonal.
[0024] In some embodiments, the semipermeable membrane 16 is a polymer-based semipermeable membrane, which is obtained by solidifying and molding a film-forming liquid. The film-forming liquid is solidified and molded in the fixed groove 15 to form a polymer-based semipermeable membrane. Since the fixed groove 15 is respectively connected to the liquid storage chamber 13 and the detection hole 12, for example, the interface between the fixed groove 15 and the liquid storage chamber 13 can be blocked from one end of the liquid storage chamber 13 with the help of other external auxiliary objects, and then the film-forming liquid of the polymer-based semipermeable membrane is dripped from the side of the fixed groove 15 close to the detection hole 12. After the solvent in the film-forming liquid evaporates, it solidifies in the fixed groove 15 and forms a polymer-based semipermeable membrane; then, the auxiliary object can be removed. The contact area between the polymer-based semipermeable membrane of the electrode in this embodiment and the liquid sample to be tested is increased, which can improve the response time of the electrode and indirectly improve the test speed of the instrument.
[0025] See also Figure 2 In some embodiments, the electrode further includes a reinforcement groove 17, which is provided on the side wall of the fixing groove 15, and is used to strengthen the connection strength between the semipermeable membrane and the housing 11. The cross section of the reinforcement groove 17 can be any suitable shape, such as a rectangle, a trapezoid or a triangle.
[0026] In some embodiments, the shell 11 is also provided with a shell mounting through hole 19, and the liquid storage chamber 13 is connected to the external environment through the shell mounting through hole 19; the electrode 100 also includes: a metal contact 20, the metal contact 20 is inserted into the shell mounting through hole 19, and the metal contact 20 is used to connect the silver-silver chloride electrode 14 with an external circuit. In some embodiments, the metal contact 20 is a gold-plated metal contact. Specifically, the gold-plated metal contact includes a copper substrate and a gold-plated layer disposed on the copper substrate. The corrosion resistance of the gold-plated layer is higher than that of Ag, so that the metal contact is not prone to the phenomenon of unstable electrical signal transmission due to oxidation. Specifically, in some embodiments, one end of the silver-silver chloride electrode 14 is welded to the metal contact 20, and the other end of the silver-silver chloride electrode 14 is inserted into the liquid storage chamber 13.
[0027] In some embodiments, the housing 11 is further provided with a liquid exchange port 21, the liquid exchange port 21 is in communication with the liquid storage chamber 13, and the liquid exchange port 21 is used to introduce or discharge the potassium chloride liquid into or out of the liquid storage chamber 13. In other embodiments, the electrode 100 is further provided with a sealing cover 22 used in conjunction with the liquid exchange port 21, and the opening and closing of the liquid exchange port 21 is controlled by the sealing cover 22.
[0028] In some embodiments, the housing 11 is further provided with a plurality of sampling holes connected to the detection hole 12 , and the plurality of sampling holes are connected to each other. The sampling holes are used to collect the liquid to be tested, and the liquid to be tested enters the detection hole 12 through the sampling holes.
[0029] In a second aspect of the present application, an electrochemical sensor, such as an electrolyte analyzer, is also provided. Exemplarily, Figure 3 The hardware structure of the electrochemical sensor is shown. Figure 3 As shown, the electrochemical sensor 300 includes a controller 310 and the electrode 330 provided in the above embodiment, and the controller 310 is connected to the electrode 330 .
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An electrode, characterized in that: The electrode comprises: A shell, wherein the shell is provided with a detection hole, a liquid storage cavity is provided in the shell, the liquid storage cavity is communicated with the external environment through the detection hole, and the liquid storage cavity is used to contain internal filling liquid; A silver-silver chloride electrode, wherein the silver-silver chloride electrode is installed in the housing, one end of the silver-silver chloride electrode is used to be connected to an external circuit, and the other end of the silver-silver chloride electrode is inserted into the liquid storage cavity and is used to contact the internal filling liquid; A fixing groove, the fixing groove is formed on the inner wall of the shell, and the fixing groove is formed between the liquid storage cavity and the detection hole, and the fixing groove is connected with the liquid storage cavity and the detection hole; A semipermeable membrane, wherein the semipermeable membrane is arranged in the fixing groove, the semipermeable membrane is fixed to the shell through the fixing groove, the semipermeable membrane is used to block the connection path between the liquid storage chamber and the detection hole, one side surface of the semipermeable membrane is used to contact with the internal filling liquid, and the other side surface of the semipermeable membrane is used to contact with the liquid to be tested input from the detection hole.
2. The electrode according to claim 1, characterized in that The semipermeable membrane is a polymer-based semipermeable membrane, and the membrane-forming liquid of the polymer-based semipermeable membrane is solidified and formed in the fixing tank to form the polymer-based semipermeable membrane.
3. The electrode according to claim 1, characterized in that The electrode further comprises a reinforcement groove, which is opened on the side wall of the fixing groove and is used to strengthen the connection strength between the semi-permeable membrane and the shell.
4. The electrode according to any one of claims 1 to 3, characterized in that: The shell is further provided with a plurality of sampling holes connected with the detection hole, and the plurality of sampling holes are connected with each other. The sampling holes are used to collect the liquid to be detected, and the liquid to be detected enters the detection hole through the sampling holes.
5. The electrode according to any one of claims 1 to 3, characterized in that: The shell is also provided with a shell installation through hole, and the liquid storage cavity is connected with the external environment through the shell installation through hole; The electrode further comprises: A metal contact is inserted into the housing mounting through hole, and the metal contact is used to connect the silver-silver chloride electrode with an external circuit.
6. The electrode according to claim 5, characterized in that The metal contacts are gold-plated metal contacts.
7. The electrode according to any one of claims 1 to 3, characterized in that: The shell is also provided with a fluid exchange port, which is communicated with the fluid storage cavity and is used to introduce or discharge the internal filling fluid into or out of the fluid storage cavity.
8. The electrode according to claim 7, characterized in that The electrode further comprises a sealing cover matched with the fluid exchange port, and the sealing cover is used to control the opening and closing of the fluid exchange port.
9. An electrochemical sensor, characterized in that: The electrochemical sensor comprises a controller and the electrode according to any one of claims 1 to 8, wherein the controller is connected to the electrode.