S-1 Supporting Information Fluorine and Nitrogen Co-doped MoS 2 with a Catalytically Active Basal Plane Yuanzhe Wang † , Shanshan Liu † , Xianfeng Hao † , Junshuang Zhou, Dandan Song, Dong Wang, Li Hou, Faming Gao* Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China. *Corresponding author. E-mail: fmgao@ysu.edu.cn. †These authors contributed equally to this work.