Visible Light Photolysis at Single Atom Sites in Semiconductor Perovskite Oxides

Allan, Michael G.; Yang, Rachel A.; Marino, Silvia; Gordon, Michael J.; Christopher, Phillip; Nikolla, Eranda

doi:10.1021/jacs.4c13821

Visible Light Photolysis at Single Atom Sites in Semiconductor Perovskite Oxides

Journal Article · Fri Dec 27 00:00:00 EST 2024 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.4c13821· OSTI ID:2483937

^[1]; Yang, Rachel A. ^[1]; Marino, Silvia ^[2]; ^[2]; ^[2]; ^[1]

University of Michigan, Ann Arbor, MI (United States)
University of California, Santa Barbara, CA (United States)

Designing catalysts with well-defined active sites with chemical functionality responsive to visible light has significant potential for overcoming scaling relations limiting chemical reactions over heterogeneous catalyst surfaces. Visible light can be leveraged to facilitate the removal of strongly bound species from well-defined single cationic sites (Rh) under mild conditions (323 K) when they are incorporated within a photoactive perovskite oxide (Rh-doped SrTiO₃). CO, a key intermediate in many chemistries, forms stable geminal dicarbonyl Rh complexes (Rh⁺(CO)₂), that could act as site blockers or poisons during a catalytic cycle. For the first time, we demonstrate that CO removal can occur at mild temperatures (323 K) under low-energy red light (635 nm) irradiation, which is not possible for supported isolated-site Rh catalysts (0.2 wt % Rh/γ-Al₂O₃). Photolysis of supported Rh⁺(CO)₂ complexes (e.g., 0.2 wt % Rh/γ-Al₂O₃) has been demonstrated but is limited to high energy UV photons. Rigorous kinetic experiments elucidate disparate mechanisms for CO photodepletion from Rh-doped SrTiO₃ and supported isolated site Rh/γ-Al₂O₃. CO photodepletion from supported isolated site Rh/γ-Al₂O₃ involves a direct metal to ligand charge transfer mechanism, whereas Rh-doped SrTiO₃ is governed by electron–hole pair formation in the perovskite. We show that under visible, low-energy red light, surface Rh species in Rh-doped SrTiO₃ introduce midgap energy states above the valence band that facilitate electronic excitations leading to surface CO removal. Isolated Rh sites in Rh-doped SrTiO₃ also exhibit exceptional stability under multiple CO photodepletion cycles. Altogether, incorporating single sites into photoactive perovskite oxides is an effective strategy to influence surface chemistries with visible light.

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This content will become publicly available on Sat Dec 27 00:00:00 EST 2025

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: SC0023464

OSTI ID:: 2483937

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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