Journal
JOURNAL OF POWER SOURCES
Volume 533, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231410
Keywords
Photoelectrochemical water splitting; Single -atom catalyst; Redox photoelectrodeposition; Hydrogen evolution reaction
Funding
- Korea government (MSIT) [2021R1A2C3011870]
- Ministry of Science and ICT [NRF-2018M3D1A1058728]
- National Research Foundation of Korea (NRF)
- Creative Materials Discovery Program through National Research Foundation of Korea (NRF)
- National Research Foundation of Korea [2021R1A2C3011870] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This article introduces a technique for depositing efficient catalysts on photoelectrochemical electrodes to enhance surface activation and water splitting efficiency. The technique enables atomic-scale deposition of Pt catalysts with uniform distribution and position-selective deposition. The resulting photocathode exhibits high photocurrent density, more positive onset potential, and outstanding operational stability.
The fabrication of photoelectrochemical (PEC) cells using Cu2O, a semiconductor light absorber that responds to infinite sunlight, requires techniques for loading and activating highly efficient cocatalysts to increase the hydrogen production selectivity. However, there has been relatively little interest in techniques for the deposition of efficient catalysts on PEC electrodes that can maximize the surface activation of the light absorption layer for water splitting, because precise control of the Pt loading at the atomic scale is difficult. We designed an intelligent multiple-redox illuminated deposition technique capable of depositing atomic-scale Pt catalysts with optimal performance on the photocathode surface. An Sb:Cu2O/Cu2O/Al:ZnO/TiO2 photocathode with the proposed atomic-scale Pt catalyst has a high photocurrent density of 6.2 mA cm-2 and a more positive onset potential of 0.71 VRHE. In addition, the mass activity of this electrode is 3.35 times higher than that of Pt samples deposited by conventional methods, and the electrode also shows outstanding operational stability. The proposed approach enables a uniform catalyst distribution and position-selective deposition atomic-scale Pt by repeated redox reactions. Consequently, our proposal enables the simultaneous realization of enhanced conversion efficiency and low cost by the consumption of a relatively small quantity of Pt in controllable redox photodeposition.
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