基金This work was supported by one Hundred Talents' Program of the Chinese Academy of Science, the National Natural Science Foundation of China (No.20773116, No.21273215, and No.J1030412), and 973 Program from theMinistry of Science and Technology of China (No.2010CB923302). Many Thanks to Prof. Shen Ye from Hokkaido university for the help in establishing techniques for single crystalline electro- chemistry.