Inhibition of H_2 and O_2 Recombination: The Key to a Most Efficient Single-Atom Co-Catalyst for Photocatalytic H_2 Evolution from Plain Water

Imgon Hwang; Anca Mazare; Johannes WillTadahiro YokosawaErdmann SpieckerPatrik Schmuki

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Inhibition of H_2 and O_2 Recombination: The Key to a Most Efficient Single-Atom Co-Catalyst for Photocatalytic H_2 Evolution from Plain Water

机译：Inhibition of H_2 and O_2 Recombination: The Key to a Most Efficient Single-Atom Co-Catalyst for Photocatalytic H_2 Evolution from Plain Water

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In the present work, it is shown that anodic TiO_2 nanotubes (NTs) can be decorated with Pt, Pd, Rh, and Au single atoms (SAs) by a simple “dark deposition” approach. Such TiO_2 NTs with surface trapped noble metal SAs provide a high activity for photocatalytic H_2 generation from pure water, i.e., in absence of a sacrificial agent. However, noble metals also act as active centers in the undesired hydrogen back-oxidation (H_2 + O_2 → H_2O), leading to a decrease in the overall photocatalytic H_2 production efficiency. Here it is reported that the use of noble metal co-catalysts, in the form of single atoms, can inhibit this recombination. From the different noble-metal SAs investigated, Pd SAs yield the highest H_2 production rate of 0.381 μmol h~(?1) cm~(?1) at a density of 0.41 × 10~5 Pd atoms μm~(?2). Overall, the results provide a path to a highly efficient photocatalytic performance for water splitting by the suppression of the H_2/O_2 recombination, which can be effectively achieved using Pd in the form of SAs as photocatalytic co-catalysts.

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《Advanced functional materials》 |2022年第44期|2207849.1-2207849.7|共7页
作者
Imgon Hwang; Anca Mazare; Johannes WillTadahiro YokosawaErdmann SpieckerPatrik Schmuki;
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作者单位

Institute of Micro- and Nanostructure Research & Center for nanoanalysis and Electron Microscopy (CENEM) University of Erlangen-Nuremberg IZNF, Cauerstrasse 3, 91058 Erlangen, Germany;

Department of Materials Science WW4-LKO Friedrich-Alexander-University of Erlangen-Nuremberg Martensstrasse 7, 91058 Erlangen, Germany,Regional Centre of Advanced Technologies and Materials Slechtitel? 27, Olomouc 78371, Czech Republic,Department of Chemi;

Department of Materials Science WW4-LKO Friedrich-Alexander-University of Erlangen-Nuremberg Martensstrasse 7, 91058 Erlangen, GermanyDepartment of Materials Science WW4-LKO Friedrich-Alexander-University of Erlangen-Nuremberg Martensstrasse 7, 91058 Erlangen, Germany,Advanced Institute for Materials Research (AIMR) National University Corporation Tohoku University (TU) Sendai 980-8577,;

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H_2 and O_2 recombination; hydrogen generation; photocatalysis; plain water splitting; single-atom catalysis; TiO_2 nanotubes;

Inhibition of H_2 and O_2 Recombination: The Key to a Most Efficient Single-Atom Co-Catalyst for Photocatalytic H_2 Evolution from Plain Water

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