Publication date: 11th October 2022
Hematite (Fe2O3) is a promising photocathode material for the CO2-neutral solar energy harvesting via photoelectrochemical water splitting (PWS). However, the actual efficiency of the PWS on hematite is well below the predicted (and industrially-required) 15 % solar-to-hydrogen conversion1. Efforts on hematite are hindered by a fundamental question: how do we control charge generation, transfer and recombination? These phenomena are linked to the surface and near-surface structure of catalysts, and how they evolve during a reaction. The fundamental understanding of the atomic structure and charge dynamics of hematite is critical for the rational design of photocathodes. Hematite αFe2O3(0001) and (1-102) are the most-investigated surfaces of iron oxide in photo- and electrocatalytic research. Here, we investigate the role of alkali and transition metals on the surface and bulk structure of αFe2O3(0001) from ultra-high vacuum (UHV) to near-ambient pressure (NAP) conditions. The generation of electron/holes and their recombination on natural and Ti- and Ni-doped αFe2O3(1-102) is probed by non-contact atomic force microscopy (nc-AFM).
Czech Science Foundation and funding from PIF outgoing project number 22-18079O
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