I dont need to look up electrocution, I know all too well what it is. I have been hit by high voltage it is an evil feeling, the only thing that might be worse is fire, and electricity might beat fire as far as torture. I also know you cant readily control the outcome of running a big jolt of power through a bird. It is inhumane and you say it would taste better??. A big no there but I think arguing about it is not productive.
If you drop the bird in a cone and cut its throat, or even more humane whack its head with a cleaver it is so so easy.
I believe the word stun is used to sugar coat the processing of electrocuting chickens the, but that doesnt make it a better idea. Don't over think it whack it and done. Electricity is evil, your birds, your life, your choice, do it however you want. I have been chicken killin for almost a half a century, LOL. I will always whack the head with a cleaver, fast, humane, and instantaneous.