1. Department of Chemistry City University of Hong Kong Kowloon Hong Kong 999077 P. R. China
2. Institute of Clean Energy City University of Hong Kong Kowloon Hong Kong 999077 P. R. China
3. Frontiers Science Center for Transformative Molecules In‐Situ Center for Physical Science and Center of Hydrogen Science School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 200240 Shanghai P. R. China
4. Department of Material Science and Engineering City University of Hong Kong Kowloon Hong Kong 999077 P. R. China
5. Advanced Light Source Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
6. Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA