1Laboratory of Clean Energy Chemistry and Materials and State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China 3Institute of Materials Science of Mulhouse (IS2M), rue Jean Starcky, BP 2488, 68057 Mulhouse Cedex, France 4Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 00852, Hong Kong 5Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA 6School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798