JPH0738848Y2 - Constant potential electrolytic hydrogen sensor - Google Patents
Constant potential electrolytic hydrogen sensorInfo
- Publication number
- JPH0738848Y2 JPH0738848Y2 JP12277290U JP12277290U JPH0738848Y2 JP H0738848 Y2 JPH0738848 Y2 JP H0738848Y2 JP 12277290 U JP12277290 U JP 12277290U JP 12277290 U JP12277290 U JP 12277290U JP H0738848 Y2 JPH0738848 Y2 JP H0738848Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- working electrode
- hydrogen sensor
- gas
- platinum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は定電位電解式水素センサに関するものである。TECHNICAL FIELD The present invention relates to a potentiostatic electrolysis hydrogen sensor.
従来の技術 従来、可燃性ガス漏れ警報器やガス濃度計に用いられる
ガスセンサとして、金属酸化物焼結体型半導体ガスセン
サや接触燃焼式ガスセンサが普及している。これらのガ
スセンサでは、ガスの吸着現象や燃焼現象などを利用し
ていたため、被検ガス中の各種ガスに対して反応してし
まい、水素ガスのみを選択的に検知することが困難であ
った。2. Description of the Related Art Conventionally, as a gas sensor used in a flammable gas leak alarm and a gas concentration meter, a metal oxide sintered semiconductor gas sensor and a catalytic combustion type gas sensor have been widely used. Since these gas sensors utilize a gas adsorption phenomenon, a combustion phenomenon, and the like, they react with various gases in the test gas, making it difficult to selectively detect only hydrogen gas.
これに対し定電位電解式水素センサは水素ガスに対する
選択性に優れているので水素ガスのみを選択的に検知す
ることができる。On the other hand, the potentiostatic electrolysis hydrogen sensor is excellent in selectivity to hydrogen gas, and therefore can selectively detect only hydrogen gas.
定電位電解式ガスセンサは白金、金、パラジウム等の作
用極および対極と電解液とガス透過性のフッ素樹脂の隔
膜から構成されているのが普通である。作用極は金属の
円板もしくは円柱から構成され、検知気体中の水素はま
ず隔膜を透過し、次いで隔膜と作用極との間に形成され
る電解液膜中に溶解していって作用極表面上で反応に与
る。したがって、常時隔膜と作用極との接触状態を一定
に保ち、液膜の厚さが変わらないようにすることが肝要
である。A potentiostatic electrolysis gas sensor is usually composed of a working electrode and a counter electrode of platinum, gold, palladium or the like, a diaphragm of an electrolytic solution and a gas-permeable fluororesin. The working electrode is composed of a metal disk or cylinder, and hydrogen in the detection gas first permeates the diaphragm and then dissolves in the electrolyte membrane formed between the diaphragm and the working electrode to form the surface of the working electrode. Take part in the reaction above. Therefore, it is essential to keep the contact state between the diaphragm and the working electrode constant so that the thickness of the liquid film does not change.
考案が解決しようとする課題 ところが、雰囲気気体の圧力が変化したり、相対湿度が
変化すると、隔膜と作用極の接触状態が変化するという
問題がある。また隔膜と作用極の接触状態を一定にしよ
うとすれば細心の注意が必要であり、それだけセンサ製
造工数が多くなるという問題がある。更に、接触状態を
一定にするために隔膜と作用極を押し付けた場合、電解
液の回りが悪くなり、出力が不安定になるという問題が
ある。However, there is a problem that the contact state between the diaphragm and the working electrode changes if the pressure of the atmospheric gas changes or the relative humidity changes. Further, if the contact state between the diaphragm and the working electrode is to be kept constant, great care must be taken, and the number of man-hours for manufacturing the sensor increases accordingly. Furthermore, when the diaphragm and the working electrode are pressed against each other in order to keep the contact state constant, there is a problem in that the electrolyte solution becomes unfavorable and the output becomes unstable.
課題を解決するための手段 そのような課題を解決するものとして、本考案において
は、二酸化鉛電極よりなる対極と、白金を無電解めっき
した炭素繊維電極よりなる作用極と、電解液と、作用極
に圧接された隔膜とを有することを特徴とする定電位電
解式水素センサを採用した。Means for Solving the ProblemsAs means for solving such problems, in the present invention, a counter electrode composed of a lead dioxide electrode, a working electrode composed of a carbon fiber electrode electrolessly plated with platinum, an electrolytic solution, and a working solution A potentiostatic electrolytic hydrogen sensor characterized by having a diaphragm pressed against the pole was adopted.
作用 作用極に用いた白金を無電解めっきした炭素繊維電極は
弾力性を持っており、電導性にも優れている。繊維であ
るので、電解液の回りが良いため、隔膜と作用極を強く
押さえ付けることができる。したがって、隔膜と作用極
との接触状態を一定にすることができ、出力が安定す
る。The platinum-electroless carbon fiber electrode used for the working electrode has elasticity and excellent electrical conductivity. Since it is a fiber, it has good circulation around the electrolytic solution, so that the diaphragm and the working electrode can be strongly pressed. Therefore, the contact state between the diaphragm and the working electrode can be made constant, and the output becomes stable.
実施例 以下、本考案を好適な実施例を用いて説明する。図１は
本考案の一実施例にかかる定電位電解式水素センサの断
面構造を示す。同図において１はABS樹脂製の中蓋、２
はＯ−リング、３は多孔性ポリ４フッ化エチレン膜、４
は４フッ化エチレン６フッ化プロピレンコポリマー膜か
らなる隔膜、５は白金を無電解めっきした炭素繊維電
極、６はチタン線からなるリード線、７は酢酸と酢酸カ
リウムと酢酸鉛の混合水溶液からなる電解液、８は多孔
性の二酸化鉛電極、９はABS樹脂製のホルダー本体、10
はABS樹脂製のホルダー蓋である。Embodiment Hereinafter, the present invention will be described with reference to a preferred embodiment. FIG. 1 shows a sectional structure of a potentiostatic electrolytic hydrogen sensor according to an embodiment of the present invention. In the figure, 1 is an ABS resin inner lid, 2
Is an O-ring, 3 is a porous polytetrafluoroethylene film, 4
Is a membrane made of tetrafluoroethylene hexafluoropropylene copolymer film, 5 is a carbon fiber electrode electrolessly plated with platinum, 6 is a lead wire made of titanium wire, 7 is made of a mixed aqueous solution of acetic acid, potassium acetate and lead acetate. Electrolyte, 8 is a porous lead dioxide electrode, 9 is a holder body made of ABS resin, 10
Is a holder lid made of ABS resin.
ホルダー本体９およびホルダー蓋10には、それぞれネジ
が切られている。中蓋１、Ｏ−リング２、多孔性ポリ４
フッ化エチレン膜３、隔膜４、白金めっき炭素繊維電極
５は、ホルダー本体９とホルダー蓋10とのネジ締めによ
って押圧され、良好な接触状態が保持される。中蓋１は
押圧端板として機能し、多孔性ポリ４フッ化エチレン膜
３は隔膜４の表面の汚れを防止させるためのものであ
る。Ｏ−リング２によって気密、液密性が確保される。
炭素繊維電極５の白金めっき厚みは１μｍ以上が好まし
く、それ以下であると、出力の経時変化が大きくなる。The holder body 9 and the holder lid 10 are each threaded. Inner lid 1, O-ring 2, porous poly 4
The ethylene fluoride film 3, the diaphragm 4, and the platinum-plated carbon fiber electrode 5 are pressed by screwing the holder body 9 and the holder lid 10, and a good contact state is maintained. The inner lid 1 functions as a pressing end plate, and the porous polytetrafluoroethylene film 3 is for preventing the surface of the diaphragm 4 from being soiled. The O-ring 2 ensures air tightness and liquid tightness.
The platinum plating thickness of the carbon fiber electrode 5 is preferably 1 μm or more, and when it is less than that, the change in output with time becomes large.
上述の実施例で得られた定電位電解式水素センサをＡと
し、実施例において作用極に白金めっき炭素繊維の代わ
りに白金板を用いたセンサをＢとし、センサの出力電圧
の経時変化を調べたところ、本考案のセンサＡは非常に
安定であったが、センサＢは電解液の回りが悪く、出力
の低下が見られた。これは明らかに本考案における白金
めっき炭素繊維電極の効果を指し示したものである。Let A be the potentiostatic electrolysis hydrogen sensor obtained in the above-mentioned embodiment, and let B be the sensor using a platinum plate in place of the platinum-plated carbon fiber in the working electrode in the embodiment, and check the change with time of the output voltage of the sensor. As a result, the sensor A of the present invention was very stable, but the sensor B had a poor output around the electrolyte and a decrease in output was observed. This clearly indicates the effect of the platinum-plated carbon fiber electrode in the present invention.
考案の効果 以上述べたように、本考案による定電位電解式水素セン
サは、作用極に白金めっきした炭素繊維電極を用いてい
るため、隔膜との接触が強く、電解液の回りが良いの
で、出力が安定しており、その工業的価値は極めて大で
ある。Effect of the Invention As described above, the potentiostatic electrolysis hydrogen sensor according to the present invention uses a platinum-plated carbon fiber electrode on the working electrode, so that it has a strong contact with the diaphragm and a good electrolyte flow. The output is stable and its industrial value is extremely high.
第１図は本考案による定電位電解式水素センサの断面構
造を示す図である。 １……中蓋 ２……Ｏ−リング ３……多孔性ポリ４フッ化エチレン膜 ４……隔膜 ５……白金の無電解めっき炭素繊維電極 ６……リード線 ７……電解液 ８……二酸化鉛電極 ９……ホルダー本体 10……ホルダー蓋FIG. 1 is a view showing a sectional structure of a potentiostatic electrolytic hydrogen sensor according to the present invention. 1 ... Inner lid 2 ... O-ring 3 ... Porous polytetrafluoroethylene film 4 ... Diaphragm 5 ... Electroless plating platinum carbon fiber electrode 6 ... Lead wire 7 ... Electrolyte 8 ... Lead dioxide electrode 9: Holder body 10: Holder lid
Claims (1)
解めっきした炭素繊維電極よりなる作用極と、電解液
と、ガス透過性の隔膜であって作用極に圧接されたもの
とを備え、作用極での水素ガスの電気化学的酸化反応
と、対極での二酸化鉛の電気化学的還元反応とを利用し
た、定電位電解式水素センサ。1. A counter electrode composed of a lead dioxide electrode, a working electrode composed of a carbon fiber electrode electrolessly plated with platinum, an electrolytic solution, and a gas permeable diaphragm pressed against the working electrode. , A potentiostatic electrolysis hydrogen sensor utilizing the electrochemical oxidation reaction of hydrogen gas at the working electrode and the electrochemical reduction reaction of lead dioxide at the counter electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12277290U JPH0738848Y2 (en) | 1990-11-22 | 1990-11-22 | Constant potential electrolytic hydrogen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12277290U JPH0738848Y2 (en) | 1990-11-22 | 1990-11-22 | Constant potential electrolytic hydrogen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0479256U JPH0479256U (en) | 1992-07-10 |
| JPH0738848Y2 true JPH0738848Y2 (en) | 1995-09-06 |
Family
ID=31870524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12277290U Expired - Lifetime JPH0738848Y2 (en) | 1990-11-22 | 1990-11-22 | Constant potential electrolytic hydrogen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738848Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6512867B2 (en) * | 2015-03-02 | 2019-05-15 | ハネウェル・インターナショナル・インコーポレーテッドＨｏｎｅｙｗｅｌｌ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｉｎｃ． | Unleaded galvanic oxygen sensor |
-
1990
- 1990-11-22 JP JP12277290U patent/JPH0738848Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0479256U (en) | 1992-07-10 |
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