1. Center for Fuel Cell Innovation; State Key Laboratory of Material Processing and Die & Mould Technology; School of Materials Science and Engineering; Huazhong University of Science & Technology; Wuhan 430074 China
2. Materials and Chemical Engineering; Faculty of Textile Science and Technology; Shinshu University; 3-15-1 Tokida Ueda 386-8567 Japan
3. Shanxi Province Key Laboratory of Functional Nanocomposite Materials; School of Materials Science and Engineering; North University of China; Taiyuan 030051 China