1. Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering; State Key Lab of Fine Chemicals, School of Chemical Engineering; Dalian University of Technology; Dalian 116024 P. R. China
2. Physical Chemistry/Electrochemistry; Technical University of Dresden; Bergstrasse 66b Dresden 01062 Germany
3. Department of Chemistry and Laboratory for Emerging Materials and Technology; Clemson University; Clemson SC 29634-0973 USA