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Ternary Oxides of s- and p-Block Metals for Photocatalytic Solar-to-Hydrogen Conversion

Simon Gelin1,*,‡, Nicole E. Kirchner-Hall1,2,‡, Rowan R. Katzbaer3, Monica J. Theibault4, Yihuang Xiong1, Wayne Zhao1,5, Mohammed M. Khan1,6, Eric Andrewlavage1, Paul Orbe1 et al.

Steven M. Baksa1, Matteo Cococcioni7, Iurii Timrov8,9, Quinn Campbell10, Héctor Abruña4, Raymond E. Schaak11, and Ismaila Dabo1,†

  • 1Department of Materials Science and Engineering, and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 2Science & Technology, Corning Incorporated, Corning, New York 14870, USA
  • 3Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 4Department of Chemistry and Chemical Biology, Cornell University, 245 Feeney Way, Ithaca, New York 14850, USA
  • 5Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA
  • 6Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
  • 7Department of Physics, University of Pavia, via Bassi 6, Pavia I-27100, Italy
  • 8Theory and Simulation of Materials (THEOS) and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
  • 9Laboratory for Materials Simulations (LMS), Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland
  • 10Center for Computing Research, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
  • 11Department of Chemistry, Department of Chemical Engineering, and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

  • *gelin@psu.edu
  • dabo@psu.edu
  • These authors contributed equally to this work.

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 p block of the periodic table (e.g., In, Sn, Sb, Pb, and Bi) 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 s-block cations into p-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 s-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 s- and p-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 CsIn3O5, Sr2In2O5, and KSbO2, which, to the extent of our literature review, have not been previously considered as water-splitting photocatalysts.

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A Sunny Path to Green Hydrogen

Published 13 February, 2024

A theoretical study of metal oxides identifies potential candidate materials for generating hydrogen fuel from water and sunlight.

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