Hydrogen Evolution Reaction Boosted by Bridge Bonds 3 between Electrocatalyst and Electrode 4

6 7 †School of Chemical Science and Engineering, Tongji University, Siping Road 1239, Shanghai 200092, 8 P. R. China 9 ‡Research Center for Translational Medicine & Key Laboratory of Arrhythmias of the Ministry of 10 Education of China, East Hospital, Tongji University School of Medicine, No. 150 Jimo Road, 11 Shanghai 200120, P. R. China 12 #Shanghai Ultra-Precision Optical Manufacturing Engineering Center and Department of Optical 13 Science and Engineering, Fudan University, Shanghai 200433, P. R. China 14 §Department of Chemistry, the Hong Kong University of Science and Technology, Clear Water Bay, 15 Kowloon, Hong Kong, P. R. China 16 ¶Key Laboratory for Special Functional Material of Ministry of Education, and School of Physics and 17 Electronics, Henan University, Kaifeng 475001, P. R. China 18