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Current–voltage characteristics of the pristine AMX-Sb membrane and different modified membranes: (a) AMX-Sb1, AMX-Sb2, and AMX-Sb3 membranes having nearly the same Sscr≈ 10%; (b) AMX-Sb2 and AMX-Sb5 membranes having nearly the same size of spots and different values of Sscr, for the AMX-Sb5 membrane Sscr ≈ 22%.
