It is often advisable to keep the potential below 1.2 V in order to avoid the water splitting but when I used to extend the voltage little bit high then my material used to give the same type of behavior. So how do we know that water splitting has occurred in our system or not ? And in some of the articles it is mentioned that with their material they are able to increase the potential window upto 1.6 or something (greater than 1.2 V) while dealing with aqueous electrolyte. What does that mean. Can anyone help me to figure it out.