How do I make lead dioxide electrodes at home? Can I simply electrolyze lead?

I have a couple 2 pound lead fishing weights, which I believe are almost pure lead. Right now I'm working on an electrolysis cell for making sodium chlorate. I heard that lead dioxide makes good inert electrodes that will corrode slowly, and if I can make it out of lead they would be pretty cheap. So how can I turn my lead fishing weights into lead dioxide? I heard that if I simply use them for electrodes they anode will continuously create a layer of lead dioxide around it. Can I just use a sodium chloride solution or do I have to use an aqueous solution of sulfuric acid? Also how does lead dioxide compare to carbon, graphite, platinum, gold, and stainless for what I'm doing? Thank you in advance.