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Ternary Oxides of - and -Block Metals for Photocatalytic Solar-to-Hydrogen Conversion
PRX Energy 3, 013007 – Published 13 February, 2024
DOI: https://doi.org/10.1103/PRXEnergy.3.013007
Abstract
Oxides containing metals or metalloids from the block of the periodic table (e.g., , , , , and ) are of technological interest as transparent conductors and light absorbers for solar-energy conversion due to the tunability of their electronic conductivity and optical absorption. Comparatively, these oxides have found limited applications in hydrogen photoelectrolysis, primarily due to their high electronegativity, which impedes electron transfer for reducing protons into hydrogen. We have shown recently that inserting -block cations into -block metal oxides is effective at lowering electronegativities while affording further control of band gaps. Here, we explain the origins of this dual tunability by demonstrating the mediator role of -block cations in modulating orbital hybridization while not contributing to frontier electronic states. From this result, we carry out a comprehensive computational study of 109 ternary oxides of - and -block metal elements as candidate photocatalysts for solar hydrogen generation. We down-select the most desirable materials using band gaps and band edges obtained from Hubbard-corrected density-functional theory, with Hubbard parameters computed entirely from first principles, evaluate the stability of these oxides in aqueous conditions, and characterize experimentally four of the remaining materials, synthesized with high phase uniformity, to validate and further develop the computational models. We thus propose nine oxide semiconductors, including , , and , which, to the extent of our literature review, have not been previously considered as water-splitting photocatalysts.
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synopsis
A Sunny Path to Green Hydrogen
A theoretical study of metal oxides identifies potential candidate materials for generating hydrogen fuel from water and sunlight.
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Popular Summary
Oxides that contain s- and p-block elements offer tunable electronic conductivity and optical absorption, which is promising for photocatalytic hydrogen generation. Here, the authors explore this dual tunability by combining materials modeling, computational design, experimental synthesis, and electrochemical characterization. As a result, they discover a versatile class of photocatalytic semiconductors that incorporate electropositive elements into photoactive oxides. Varying the incorporated electropositive elements enables simultaneous tuning of redox activity, solar absorption, and aqueous stability, thereby opening a route toward corrosion-resistant semiconductors that can produce carbon-neutral hydrogen under solar illumination.
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References (102)
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