Electrochemistry salt bridge

Salt bridges are widely used in electrochemistry to prevent mixing of the contents of the two electrolyte solutions making up electrochemical cells. Ordinarily, the two ends of the bridge are fitted with sintered glass disks or other porous materials to prevent liquid from siphoning from one part of the cell to the other. 

Sanger, M.J., Greenbowe, T.J. Common students misconceptions in electrochemistry Current flow in electrolyte solutions and salt bridge. Journal of Chemical Education 74 (1997), 819... 

As electrochemistry moved into mixed and nonaqueous electrolytes it became of interest to compare potentials in different media. Serious problems preventing comparison are the Uquid junctimi potentials between different electrolytes. Such liquid junction potentials also occur in the measurement in aqueous systems, but they are generally suppressed by a salt bridge. Salt bridges for aqueous systems usually consist of (saturated) solutions of KCl or NH4NO3. For both KCl and NH4NO3 similar mobilities for the cation and the anion of the respective salt were measured in aqueous solutions. Thus the liquid junction potential between two aqueous electrolytes cmmected via such a bridge should be smaller than the experimental error (see Chap. 1). Data in aqueous systems without liquid junction potentials are obtained from measurements in cells without transference such as ... 

Experimentally constructing an H2lH reference electrode in EL media would be similar to construction of the Agl Ag. In this particular case a platinum wire should be used and the Ag" solution replaced with an solution. The separation of the reference electrode via a salt bridge tube of compartment (depending on cell designs) is advisable in order to minimise issues with leakage of reference solution into the electroactive solution. Experimentally the set-up would be similar to that used in PELs electrochemistry (see below for further details)... 

Being candidates for donors in organic conductors, the electrochemistry of peridichalcogen-bridged polyacenes has, in particular, attracted interest. A survey of the electrochemistry and conductivity of cation-radical salts based on tetraselenotetracene and tetrathiotetracene is found in Scheme 3 <82MI 313-01>,... 

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