1. Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China
2. Center on Nanoenergy Research School of Physical Science & Technology Guangxi University Nanning 530004 China
3. Department of Materials Science and Engineering SIT Research Laboratories Innovative Global Program Faculty of Engineering Shibaura Institute of Technology Tokyo 135-8548 Japan