[1] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
[2] Drexel Univ, AJ Drexel Nanomat Inst, Philadelphia, PA 19104 USA
[3] Dalian Univ Technol, Carbon Res Lab, Liaoning Key Lab Energy Mat & Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
[4] E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China