1. Institute of Materials for Energy and Environment State Key Laboratory of Bio‐Fibers and Eco‐Textiles College of Materials Science and Engineering Qingdao University Qingdao 266071 P. R. China
2. College of Chemistry and Chemical Engineering Qingdao University Qingdao 266071 P. R. China
3. MOE Key Laboratory of Material Physics and Chemistry under Extraordinary School of Physical Science and Technology Northwestern Polytechnical University Xi'an 710072 P. R. China