The bismuth may be present in the cathode 23, 24 in {HEAD ~ various forms} such as Bi4 , BiO2 , {TAIL ~ Bi metal}, Bi3+, and various transient Bi2+ and Bi+ species, depending on the electrode potential 
The bismuth may be present in the cathode 23 , 24 in { HEAD ~ various forms } such as Bi4 , BiO2 , { TAIL ~ Bi metal } , Bi3 + , and various transient Bi2 + and Bi+ species , depending on the electrode potential
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH