For electrolyzing NaCl or KCl (see
http://misc.nicejewel.com/KClO3/) I used carbon rods which eroded dramatically after 24 hours of use, it was a nightmare to filter out the carbon remainders from the solution.
I am thinking about coiled Pt wire as an anode which cannot be attacke at all by the Cl2. But what about tantalum sheet which is far cheaper ? Is is also Cl2 resistant ?