Metal Cocatalyst Engineering in Metal‐Semiconductor Hybrid Photocatalysts Achieves a Fivefold Enhancement of Hydrogen Evolution

This study explores the optimal morphology of photochemical hydrogen evolution catalysts in a one‐dimensional system. Systematic engineering of metal tips on precisely defined CdSe@CdS dot‐in‐rods is conducted to exert control over morphology, composition, and both factors. The outcome yields an opt...

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Bibliographic Details
Published in:Chemistry : a European journal 2024-11, Vol.30 (61), p.e202402370-n/a
Main Authors: Park, Bumjin, Park, Won‐Woo, Choi, Ji Yong, Bang, Kodong, Kim, Sungjoo, Choi, Ye‐Jin, Sul, Soohwan, Kwon, Oh‐Hoon, Song, Hyunjoon
Format: Article
Language:English
Subjects:
Cadmium selenides
Charge separation
Control rods
Core-shell structure
Energy charge
Evolution
Gold
Hydrogen
Hydrogen evolution
Irradiation
Metal cocatalyst
Morphology
Photocatalysis
Photochemicals
Platinum
Quantum efficiency
Tips
Water splitting
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Summary:This study explores the optimal morphology of photochemical hydrogen evolution catalysts in a one‐dimensional system. Systematic engineering of metal tips on precisely defined CdSe@CdS dot‐in‐rods is conducted to exert control over morphology, composition, and both factors. The outcome yields an optimized configuration, a Au−Pt core‐shell structure with a rough Pt surface (Au@r‐Pt), which exhibits a remarkable fivefold increase in quantum efficiency, reaching 86 % at 455 nm and superior hydrogen evolution rates under visible and AM1.5 G irradiation conditions with prolonged stability. Kinetic investigations using photoelectrochemical and time‐resolved measurements demonstrate a greater extent and extended lifetime of the charge‐separated state on the tips as well as rapid water reduction kinetics on high‐energy surfaces. This approach sheds light on the critical role of cocatalysts in hybrid photocatalytic systems for achieving high performance. Rational engineering of metal tips on CdSe@CdS dot‐in‐rods is conducted. The optimized configuration, a gold‐platinum core‐shell tip with a rough surface, showed a remarkable fivefold quantum efficiency enhancement, exhibiting the maximum hydrogen‐evolution rates under visible and AM1.5 G irradiation. Kinetic study reveals a large extent and a longer lifetime of the charge‐separated state on the tips.
ISSN:0947-6539
1521-3765
1521-3765
DOI:10.1002/chem.202402370