JPH0258742B2 - - Google Patents
Info
- Publication number
- JPH0258742B2 JPH0258742B2 JP56196368A JP19636881A JPH0258742B2 JP H0258742 B2 JPH0258742 B2 JP H0258742B2 JP 56196368 A JP56196368 A JP 56196368A JP 19636881 A JP19636881 A JP 19636881A JP H0258742 B2 JPH0258742 B2 JP H0258742B2
- Authority
- JP
- Japan
- Prior art keywords
- matrix
- phosphoric acid
- electrolyte
- fuel cell
- bubble pressure
- 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
Links
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 52
- 239000011159 matrix material Substances 0.000 claims description 39
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 26
- 239000000446 fuel Substances 0.000 claims description 22
- 239000003792 electrolyte Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 12
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 11
- 229910010271 silicon carbide Inorganic materials 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0289—Means for holding the electrolyte
- H01M8/0293—Matrices for immobilising electrolyte solutions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Description
【発明の詳細な説明】
発明の分野
本発明は、りん酸を電解質とする燃料電池用電
解質マトリツクスに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrolyte matrix for a fuel cell using phosphoric acid as the electrolyte.
発明の技術的背景とその問題点
周知の通りりん酸電解液型燃料電池は対向して
配置されたガス拡散電極の間に液体りん酸を電解
質として保持したマトリツクスを配し、ガス拡散
電極にそれぞれ水素を含有するガスを燃料ガスと
してまた酸素を含有するたとえば空気を酸化剤ガ
スとして通流させて使用する。りん酸を電解質と
する燃料電池では、電池特性の向上、及びその長
期的安定性を図る上で、電解質マトリツクスは重
要な構成要素の一つである。Technical background of the invention and its problems As is well known, a phosphoric acid electrolyte fuel cell has a matrix holding liquid phosphoric acid as an electrolyte between gas diffusion electrodes placed opposite each other. Hydrogen-containing gas is used as a fuel gas, and oxygen-containing air, for example, is passed through as an oxidant gas. In fuel cells using phosphoric acid as an electrolyte, the electrolyte matrix is one of the important components in order to improve the cell characteristics and ensure long-term stability.
この電解質マトリツクスが燃料電池を最適の状
態で作動させるためにマトリツクス基材が具備す
べき特性としては以下の機能が挙げられる。 In order for this electrolyte matrix to operate the fuel cell in an optimal state, the characteristics that the matrix base material should have include the following functions.
１ 燃料電池の作動条件（150℃〜200℃、95〜
100％H3PO4）で熱的、化学的に安定であるこ
と。1 Fuel cell operating conditions (150℃~200℃, 95~
Be thermally and chemically stable at 100% H 3 PO 4 ).
２ 電解質に対して湿潤性があり、且つ十分な水
素イオン導電性があること。2. Must be wettable with electrolyte and have sufficient hydrogen ion conductivity.
３ 電子的絶縁体であること。3. Be an electronic insulator.
４ 燃料ガスと酸化剤ガスがマトリツクスを通し
て拡散、透過するのを防止のに十分な泡圧力を
有すること。4. Have sufficient bubble pressure to prevent fuel gas and oxidant gas from diffusing and permeating through the matrix.
５ 出来るだけ薄く、且つ適度の強度を有するこ
と。5. Be as thin as possible and have appropriate strength.
従来、使用されて来たマトリツクス基材の一つ
にフエノール樹脂不織布がある。フエノール樹脂
は高温のりん酸中（180℃以上）に長期間曝され
ていると、徐々に酸化反応をうける為に、燃料電
池出力の長期的安定性に欠ける問題があつた。又
他のマトリツクス基材として五酸化タンタル
（Ta2O5）や酸化ジルコニウム（ZrO2）のクロス
や五酸化タンタルや酸化ジルコニウムを高分子固
着剤を使用して結合し、シート化したものが報告
されている。 One of the matrix base materials that has been used conventionally is a phenolic resin nonwoven fabric. When phenolic resin is exposed to high-temperature phosphoric acid (above 180°C) for a long period of time, it gradually undergoes an oxidation reaction, which causes the problem of a lack of long-term stability in fuel cell output. Other matrix base materials have been reported, such as tantalum pentoxide (Ta 2 O 5 ) and zirconium oxide (ZrO 2 ) cloth, and sheets made by bonding tantalum pentoxide and zirconium oxide using a polymer adhesive. has been done.
しかし、これらの酸化物は高温のりん酸に対し
て化学的に安定であるが電解質保持性に問題があ
る。さらに、これらの酸化物は高温である為に多
量に使用する大容量燃料電池のマトリツクス材料
としては不適である。 However, although these oxides are chemically stable against high-temperature phosphoric acid, they have problems in electrolyte retention. Furthermore, since these oxides have high temperatures, they are unsuitable as matrix materials for large-capacity fuel cells that are used in large quantities.
一方、燃料電池の作動温度及び電極の開路電圧
において、電気化学的に安定であり長期間安定で
あり、かつ多量に各分野で使用されているので、
安価な炭化珪素（Sic）をマトリツクス材料とし
て用いた燃料電池が知られている。 On the other hand, it is electrochemically stable at the operating temperature of the fuel cell and the open circuit voltage of the electrode, and is stable for a long period of time, and is used in large quantities in various fields.
Fuel cells using inexpensive silicon carbide (Sic) as a matrix material are known.
炭化珪素を用いた電解質マトリツクスの製造法
としては、粒状乃至は、繊維状の炭化珪素に高分
子、固着剤及び溶媒を適量加えて混合し、これを
ロール展開、吹付け、塗布、薄膜プリントなどに
より電極表面に付加し、乾燥して溶媒を除去し、
これにりん酸を含浸する製造方法が行なわれてい
た。又、他の方法として本発明者等により炭化珪
素、固着剤及び、りん酸の混練物を直接電極表面
に塗布する方法が提案されている。 The method for producing an electrolyte matrix using silicon carbide includes adding and mixing appropriate amounts of polymers, adhesives, and solvents to granular or fibrous silicon carbide, and then rolling this out, spraying, coating, thin film printing, etc. is applied to the electrode surface, dried to remove the solvent,
A manufacturing method has been used in which this material is impregnated with phosphoric acid. As another method, the present inventors have proposed a method in which a kneaded mixture of silicon carbide, a fixing agent, and phosphoric acid is directly applied to the electrode surface.
これ等の炭化珪素を用いた電解質マトリツクス
は、これまでのマトリツクス材料に比して、水素
イオン伝導度、泡圧力などの特性に於いて秀れた
マトリツクスであるといえる。しかし、燃料電池
としての電池特性をさらに向上させるにはマトリ
ツクスの水素イオン伝導度を高めることが必要で
あり、その為には、リン酸量を多く添加すること
が必要である。 These electrolyte matrices using silicon carbide can be said to be superior in properties such as hydrogen ion conductivity and bubble pressure compared to conventional matrix materials. However, in order to further improve the cell characteristics as a fuel cell, it is necessary to increase the hydrogen ion conductivity of the matrix, and for this purpose it is necessary to add a large amount of phosphoric acid.
しかしながら、りん酸量をさらに多く添加する
と水素イオン伝導度は、増加するものの、逆に泡
圧力が低くなるという現象が見られた。又、マト
リツクスの厚さを薄くすることにより、水素イオ
ンの抵抗を小さくすることが出来るものの、泡圧
力が低くなり、又、機械的強度も低下した。さら
に、りん酸の絶対量が少なくなる為に、電池とし
ての寿命が低下するなどの現象が見られた。 However, when a larger amount of phosphoric acid was added, although the hydrogen ion conductivity increased, a phenomenon was observed in which the bubble pressure conversely decreased. Furthermore, although the resistance to hydrogen ions can be reduced by reducing the thickness of the matrix, the bubble pressure and mechanical strength are also reduced. Furthermore, since the absolute amount of phosphoric acid decreased, phenomena such as a decrease in battery life were observed.
以上の事は、炭化珪素を用いたマトリツクスで
は、水素イオン伝導度、泡圧力、電池寿命などの
観点から、電池としての特性を向上させる上で、
限界があることを示している。 The above points indicate that matrices using silicon carbide can improve battery characteristics in terms of hydrogen ion conductivity, bubble pressure, battery life, etc.
It shows that there are limits.
本発明者等は、以上の状況の中で、炭化珪素に
代る良好なマトリツクス材料を種々探索したとこ
ろ、フツ化炭素が良好な特性を有することを見い
出した。フツ化炭素は、化学式で一般に（CF2）
ｎ（０≦ｘ≦１）で表わされる層間化合物の一種
で今まで、潤滑材などとして一部検討されたこと
があるが工業的には殆んど使用されていない新材
料で、今回初めてリン酸電解質のマトリツクスと
して使用するものである。 Under the above circumstances, the present inventors searched for various suitable matrix materials to replace silicon carbide, and found that carbon fluoride had good properties. Carbon fluoride generally has the chemical formula (CF 2 )
This is a type of intercalation compound represented by n (0≦x≦1), and although it has been partially studied as a lubricant, it is a new material that is hardly used industrially. It is used as an acid electrolyte matrix.
本材料を種々の観点より調査したところ以下の
機能を具備していることが明らかになつた。 When this material was investigated from various viewpoints, it was revealed that it has the following functions.
１ 第１図に示すように、400℃以上まで分解な
ど起こらず、非常に安定であり、又、化学的に
も安定である。1 As shown in Figure 1, it is extremely stable and does not decompose at temperatures above 400°C, and is also chemically stable.
２ りん酸に対して湿潤性があり、且つ、十分な
水素イオン導電性がある。2. Has wettability with phosphoric acid and has sufficient hydrogen ion conductivity.
３ （CFx）ｎでｘ＝１の物では、白色で、電子
的に絶縁体である。3 (CFx) In the case of n and x=1, it is white and is an electronic insulator.
４ きわめて秀れた泡圧力を有している。4. Has extremely high bubble pressure.
５ 薄く加工出来、且つ適度の強度を有してい
る。5. Can be processed thinly and has appropriate strength.
しかも上記の機能は、炭化珪素をマトリツクス
材料とした場合に比して、種々の点で秀れている
ことが判明した。 Moreover, it has been found that the above-mentioned functions are superior in various respects compared to the case where silicon carbide is used as the matrix material.
発明の目的
本発明は、特に２，４で述べた如く、泡圧力を
下げることなく、りん酸を多量含浸し、水素イオ
ン伝導度の高いマトリツクス材料を提供するもの
である。OBJECTS OF THE INVENTION As specifically mentioned in 2 and 4, the present invention provides a matrix material impregnated with a large amount of phosphoric acid and having high hydrogen ion conductivity without lowering the bubble pressure.
発明の実施例 以下、本発明を実施例により説明する。Examples of the invention The present invention will be explained below with reference to Examples.
実施例 １
重量比で（CF）ｎで表わされる白色の粉末フ
ツ化炭素100部、固着剤としてポリテトラフルオ
ロエチレン３部の合剤に、95％濃度のりん酸の添
加量を変えて混練し、３Kg／cm2の圧力を加えて厚
さが約0.15mmのシート状マトリツクスを製造し
た。このマトリツクスの泡圧力と150℃に於ける
イオン伝導度をそれぞれ第１図、第２図に実線
11，12で示す。又、比較例として炭化珪素を同様
の条件で製造したシート状マトリツクスについて
泡圧力、イオン伝導度をそれぞれ第１図、第２図
にそれぞれ破線21，22で示す。Example 1 A mixture of 100 parts of white powder fluorocarbon represented by (CF)n by weight and 3 parts of polytetrafluoroethylene as a fixing agent was mixed with varying amounts of 95% phosphoric acid. A sheet-like matrix with a thickness of about 0.15 mm was produced by applying a pressure of 3 kg/cm 2 . The bubble pressure and ionic conductivity of this matrix at 150℃ are shown as solid lines in Figures 1 and 2, respectively.
Shown as 11 and 12. Further, as a comparative example, the bubble pressure and ionic conductivity of a sheet matrix made of silicon carbide under the same conditions are shown in FIGS. 1 and 2, respectively, by dashed lines 21 and 22.
本発明マトリツクスでは泡圧力は、第１図に示
す如くリン酸量が増加するにつれて、わずかに減
少傾向にあるが、120％添加でも0.3気圧の泡圧力
を示していた。一方比較例のマトリツクスでは
100％のリン酸以上の添加で顕著な泡圧力の減少
が見られ、120％では、0.03気圧の泡圧力で、本
発明マトリツクスの1/10になつた。 In the matrix of the present invention, the bubble pressure slightly decreased as the amount of phosphoric acid increased, as shown in FIG. 1, but the bubble pressure was 0.3 atm even at 120% addition. On the other hand, in the comparative example matrix,
A significant decrease in bubble pressure was observed with the addition of 100% phosphoric acid or more, and at 120%, the bubble pressure was 0.03 atm, which was 1/10 that of the matrix of the present invention.
又、水素イオン伝導度は、第２図に示す如く、
本発明、比較例共にリン酸量の増加につれて増加
するが、伝導度は本発明マトリツクスが高いこと
を示している。 In addition, the hydrogen ion conductivity is as shown in Figure 2.
The conductivity of both the inventive and comparative examples increases as the amount of phosphoric acid increases, indicating that the inventive matrix has higher conductivity.
又、本発明では120％のリン酸を添加しても、
マトリツクスが半固体状であり、両端を持つて垂
した場合自重にて破壊しないのに対して、比較例
では120％のリン酸を添加した場合、流動性が有
遊離リン酸が表面に浮き出しており、又、同様に
両端を持つて垂した場合自重にて破壊した。 In addition, in the present invention, even if 120% phosphoric acid is added,
The matrix is semi-solid and will not break under its own weight if held at both ends, but in the comparative example, when 120% phosphoric acid was added, it had poor fluidity and free phosphoric acid floated to the surface. Also, when held by both ends, it broke under its own weight.
以上示した如く、本発明マトリツクスは従来の
炭化珪素マトリツクスに比して、リン酸保持量が
多く、水素イオン伝導度が高く、機械的強度に秀
れていることが判つた。 As shown above, it has been found that the matrix of the present invention retains more phosphoric acid, has higher hydrogen ion conductivity, and has superior mechanical strength than conventional silicon carbide matrices.
実施例 ２
実施例１で示した重量比で、フツ化炭素100部、
ポリテトラフルオロエチレン３部、95％濃度のリ
ン酸110部より成る合剤を３Kg／cm2で加圧成型レ
シート化したものをマトリツクスとして、第３図
に主要部を示す燃料電池スタツクを組み立てた。
第３図で、１は燃料極触媒層、２は触媒層を担持
する支持体で、通常用いられるカーボンペーパー
を用いた。３は空気極触媒層４はその支持体で通
常用いられるカーボンペーパーを用いた。５は本
発明による電解質保持用マトリツクスである。６
は双極性隔離板で、燃料ガスと空気等の酸化剤ガ
スを供給する為の溝７，８を互いに直交方向に設
けたもので、隣接する各単位電池は、これを介し
て積層される。Example 2 In the weight ratio shown in Example 1, 100 parts of fluorocarbon,
A fuel cell stack, the main parts of which are shown in Figure 3, was assembled using a matrix of a mixture consisting of 3 parts of polytetrafluoroethylene and 110 parts of 95% phosphoric acid, which was pressure-molded at 3 kg/cm 2 into a receipt. .
In FIG. 3, 1 is a fuel electrode catalyst layer, 2 is a support supporting the catalyst layer, and a commonly used carbon paper was used. In No. 3, the support for the air electrode catalyst layer 4 was carbon paper, which is commonly used. 5 is an electrolyte retention matrix according to the present invention. 6
1 is a bipolar separator plate having grooves 7 and 8 in mutually orthogonal directions for supplying fuel gas and oxidizing gas such as air, and adjacent unit cells are stacked via these grooves.
上記のように構成された燃料電池の作動特性の
一例を第４図に示す。図は、単位面積当りの放電
電流に伴う単位電池の電圧変化を示してあり、実
線が本発明の特性を示すものである。又、比較
例として炭化珪素を用いて本発明と同様の条件で
マトリツクスとし、同様に構成した燃料電池の特
性例を破線で示した。 FIG. 4 shows an example of the operating characteristics of the fuel cell configured as described above. The figure shows the voltage change of a unit cell with discharge current per unit area, and the solid line shows the characteristics of the present invention. Further, as a comparative example, silicon carbide was used as a matrix under the same conditions as the present invention, and a characteristic example of a fuel cell constructed in the same manner is shown by a broken line.
図より明らかな如く、単位電池の電圧は電流値
が大きくなるにつれて減少するが、本発明マトリ
ツクスを用いた燃料電池の電圧減少が、比較例の
それよりも小さい。即ち、本発明マトリツクスの
水素イオン伝導度が高い為に水素イオン抵抗に伴
う電圧減少を小さくすることが出来、結果として
作動電圧の高い燃料電池を得ることが出来た。 As is clear from the figure, the voltage of the unit cell decreases as the current value increases, but the decrease in voltage of the fuel cell using the matrix of the present invention is smaller than that of the comparative example. That is, since the matrix of the present invention has high hydrogen ion conductivity, it was possible to reduce the voltage decrease due to hydrogen ion resistance, and as a result, a fuel cell with a high operating voltage could be obtained.
発明の効果
以上の如く、（CF）ｎより表わされるフツ化炭
素と95％以上の濃度のリン酸と、固着剤としてフ
ツ素系ポリマーを用いたマトリツクスは、りん酸
の含有量が多く、泡圧力、水素イオン伝導度が高
く、かつ取扱い容易なマトリツクスであり、これ
を使用することにより、長期的安定性に優れた大
容量燃料電池が製造可能となる。Effects of the Invention As described above, a matrix using fluorinated carbon represented by (CF)n, phosphoric acid at a concentration of 95% or more, and a fluorine-based polymer as a fixing agent has a high content of phosphoric acid and foams. This matrix has high pressure and hydrogen ion conductivity, and is easy to handle. By using this matrix, it is possible to manufacture large-capacity fuel cells with excellent long-term stability.
第１図、第２図は本発明に係る燃料電池用電解
質マトリツクスの一実施例のリン酸量に対する泡
圧力、伝導度を示す特性図、第３図は本発明の電
解質マトリツクスを用いた燃料電池を一部を切欠
いて示す斜視図、第４図は第３図で示した燃料電
池の作動状態を示す特性図である。
１…燃料極触媒層、３…空気極触媒層、５…電
解質保持用マトリツクス、６…双極性隔離板。
Figures 1 and 2 are characteristic diagrams showing the bubble pressure and conductivity with respect to the amount of phosphoric acid of an example of the electrolyte matrix for fuel cells according to the present invention, and Figure 3 is a characteristic diagram of a fuel cell using the electrolyte matrix of the present invention. FIG. 4 is a characteristic diagram showing the operating state of the fuel cell shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Fuel electrode catalyst layer, 3... Air electrode catalyst layer, 5... Electrolyte holding matrix, 6... Bipolar separator.
Claims (1)
度の高いリン酸と、固着剤としてフツ素系ポリマ
ーとを含む混合物より成ることを特徴とする燃料
電池用電解質マトリツクス。1. An electrolyte matrix for a fuel cell, comprising a mixture containing fluorinated carbon having the chemical formula (CF)n, highly concentrated phosphoric acid, and a fluorine-based polymer as a fixing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56196368A JPS58100369A (en) | 1981-12-08 | 1981-12-08 | Electrolyte matrix for fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56196368A JPS58100369A (en) | 1981-12-08 | 1981-12-08 | Electrolyte matrix for fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58100369A JPS58100369A (en) | 1983-06-15 |
| JPH0258742B2 true JPH0258742B2 (en) | 1990-12-10 |
Family
ID=16356687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56196368A Granted JPS58100369A (en) | 1981-12-08 | 1981-12-08 | Electrolyte matrix for fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58100369A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4290616B2 (en) * | 2004-07-21 | 2009-07-08 | 三洋電機株式会社 | Fuel cell electrolyte, membrane electrode assembly, fuel cell stack, fuel cell system, and fuel cell electrolyte manufacturing method |
-
1981
- 1981-12-08 JP JP56196368A patent/JPS58100369A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58100369A (en) | 1983-06-15 |
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