Electrochemical Methods: Fundamentals and Applications by Allen J. Bard and Larry R. Faulkner is an excellent book on general electrochemistry and covers potential sweep methods in chapter 6.
Instrumental Methods in Electrochemistry_Southampton Electrochemistry Group. Most of the above mentioned books are very theoritical with models and equations that probably you do not need at this time. Electroanalytical Methods is also one of the best.