120th General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Exhibition Hall 2+3
Time 10월 20일 (금요일) 13:00~14:30
Code PHYS.P-101
Subject Synthesis of Ultra-small Pd Nanoparticles Deposited on CdS Nanorods by Pulsed Laser Ablation in Liquid: Role of Metal Nanocrystal Size in the Photocatalytic Hydrogen Production
Authors Hanbit Park, Amaranatha reddy1, TaeKyu Kim*
Department of Chemistry, Pusan National University, Korea
1Department of Chemistry, Pusan National University, India
Abstract It is essential to suppress the recombination rate of photogenerated carriers for the improvement of semiconductor-catalyzed solar-driven hydrogen production. To that end, photocatalysts comprising active sunlight-harvesting photoabsorbers and stable metal co-catalysts have attracted significant attention. However, the size, clean surface, and highly dispersed nature of the metal co-catalysts are crucial factors affecting the catalyst performance and reaction rate. Nevertheless, most of the available metal nanocrystals have been synthesized using complex procedures and harmful organic templates and stabilizers, affording high-purity compounds with difficulty and high cost. To overcome this difficulty, in this study, the pulsed laser ablation in liquid approach was utilized to generate Pd and bimetallic PdPt nanoparticles with an average size and distribution by adjusting the laser wavelength and fluence. A high hydrogen evolution rate of 130.33 mmol·g-1·h-1 was obtained using the optimized CdS–PdPt catalyst under simulated sunlight irradiation. This value is 51.31 times greater than that observed for bare CdS nanostructures. Furthermore, the amount of evolved hydrogen was significantly better than that obtained using several noble-metal co-catalysts deposited on CdS. This proposed strategy is thought to open new strategy for designing advanced photocatalytic materials for efficient solar-driven hydrogen production.
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