what is the material used for the anode and cathode in the electrolysis of water? where do the +ve and -ve ions go (cathode / anode)?
Graphite rod acts as cathode and anode.
Hydrogen and oxygen gases are collected at cathode and anode respectively.
At cathode:-
Red
2 H+(aq) +2e- → H2
At anode:-
Ox
OH-(aq) → OH + e-
4 OH → 2H2O + O2