1. School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China
2. State Key Lab of Fine Chemicals School of Chemical Engineering Liaoning Key Lab for Energy Materials and Chemical Engineering Dalian University of Technology Dalian 116024 China
3. National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
4. Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
5. Department of Materials Science and Engineering University of California Berkeley CA 94720 USA
6. College of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China