1. Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P. R. China
2. Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
3. Department of Chemical Physics Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) University of Science and Technology of China (USTC) Hefei 230026 P. R. China
4. Solar and Photovoltaic Engineering Research Center (SPERC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia