1. Energy Centre, Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa
2. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
3. Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
4. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, Zhejiang 310027, China
5. Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
6. Department of Chemistry, Tshwane University of Technology, Pretoria 0001, South Africa
7. Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa