1. State Key Laboratory of Urban Water Resource and EnvironmentSchool of EnvironmentHarbin Institute of Technology Harbin 150090 China
2. School of Chemistry and Chemical EngineeringHarbin Institute of Technology Harbin 150090 China
3. Innovative Centre for Flexible Devices (iFLEX)School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
4. College of Urban Construction and Environmental EngineeringChongqing University Chongqing 400000 China