1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin D-14195, Germany
2. Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
4. Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Bayreuth D-95447, Germany