Mukti has pretty good advice. Divine Shield makes for a solid defense, though I think Animal Devotion, Protection Devotion, and Law Devotion outclass it. You might think of a Cleric dip just for extra devotion feats and things like more Turn Undead.
Also, if you're looking for a Paladin tank character but a build that plays more classic or "straightforward" than a ToB character, the Hellreaver from Fiendish Codex 2 is quite good and easy to get into. Given the OP it'd probably be my top suggestion.
His stats and feats aren't great for Paladin tank, to be honest. As Jack points out, he's kind of screaming for Stand Still with the Dex and Power Attack I suppose, though I don't know where he's going to get a ton of accuracy for it. As a higher level option, he could use Find the Gap from the Paladin spell list, I suppose. But, I'd recommend Hellreaver above all of that.