Cao, H.Z., Yang, D., Zhu, S.L., Dong, L. and Zheng, G.Q. (2012) Preparation, Characterization, and Electrochemical Studies of Sulfur-Bearing Nickel in an Ammoniacal Electrolyte: The Influence of Thiourea. Journal of Solid State Electrochemistry, 16, 3115-3122.