Alkaline fuel cells are the first fuel cells to be used. In AFC , the concentrated KOH solution acts both as an electrolyte and as a coolant. It acts to transfer OH- from the cathode to the anode . The operating temperature of the battery is typically 80 degrees Celsius and is sensitive to CO2 poisoning.
Alkaline fuel cells usually use potassium hydroxide or sodium hydroxide as the electrolyte, the conductive ions are OH- , and the fuel is hydrogen.
Anode reaction: H2+2OH- → 2H2O+O2   Standard electrode potential is -0.0828V
Cathodic reaction: 1/2O2+H2O+2e- → 2OH-    Standard electrode potential is 0.401V
Total response:  1/2O2+O2+H2 → H2O     The theoretical electromotive force is 0.401- ( -0.828 ) =-1.229V
The catalyst of AFC mainly uses noble metals such as platinum, palladium, gold, silver and transition metals such as nickel, cobalt and manganese.
The advantages of AFC are:
High efficiency because the reduction of oxygen in alkaline media is higher than other acidic media;
Because it is an alkaline medium, a non-platinum catalyst can be used;
Due to the low working temperature and alkaline medium, nickel plates can be used as bipolar plates.
The disadvantages of AFC are:
Because the electrolyte is alkaline, easy and CO2 generation K2CO3, Na2CO3 precipitation, seriously affect battery performance, it is necessary to remove the CO2, which gives the application a great deal of difficulty in a normal environment.
The water balance problem of the battery is complicated and affects the stability of the battery.
High Temperature Resistant Polyolefin Tubing
Product description:
KY-175℃ KYNAR High temperature resistant heat shrinkable tube is made of irradiation cross-linked special fluorine polymer PVDF ( polyvinylidene fluoride ). Heat-resistant heat-shrinkable tube with the specialty of superior chemical and physical properties, high temperature resistance, high flame resistance, chemical solvent resistance, rub resistance, and so on.
High temperature resistant Heat Shrink Tubing it`s used in automobile, electronics, military, medical equipment and other fields and allies to industries: automobile, motorcycle cables,bicycle brake cables for insulation protection. Scalpel,coagulator knife, electric coagulation knife and other metal medical equipment for insulation protection.
Feature & benefit:
a) Semi-hard materials, thin wall design
b) Resistant to 175 degrees Celsius
c) Shrink ratio: 2/1, 3/1
d) High flame resistance VW-1
e) Transparent design, inner player is visual when operating
Operating Indexes:
a) Min. Shrink temp.: 155 degrees Celsius
b) Recovered Shrink temp.: 175 degrees Celsius
c) Working temperature: -55~175 degrees Celsius
Up to standard: Approvals
Meet AMS-DTL-23053/18 , Class 2
Meet UL224 150 degrees Celsius 600V VW-1
High Temperature Resistant Polyolefin Tubing
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