1. University of Science and Technology of China, Hefei 230026, P R China
2. Guangzhou Institute of Energy Conversion, Key Laboratory of Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, P R China
3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, P R China
4. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, P R China