Size-Effect on Electrochemical Hydrogen Evolution Reaction by Single-Size Platinum Nanocluster Catalysts Immobilized on Strontium Titanate

作者：Tsunoyama, Hironori; Yamano, Yohei; Zhang, Chuhang; Komori, Masafumi; Eguchi, Toyoaki; Nakajima, Atsushi^*

来源：Topics in Catalysis, 2018, 61(1-2): 126-135.

DOI：10.1007/s11244-018-0884-7

• Hydrogen evolution reaction (HER)
• Nanocluster catalyst
• Magnetron sputtering
• Size-selected nanocluster
• Electrochemistry

Size-specific chemical properties of metal nanoclusters (NCs) have motivated their applications in catalysis, whose properties were found to be dramatically different from bulk materials. We have reported herein the size-dependent activity of platinum (Pt) NCs for the electrochemical hydrogen-evolution-reaction (HER) in neutral water. The single-size NC catalysts were prepared by the soft-landing of mass-selected Pt NCs on a strontium titanate (SrTiO3) (100) surface using an intensive, size-selective NC source based on high-power impulse magnetron sputtering. Successful fabrications of single-size Pt NC catalysts were confirmed with scanning tunneling microscopy. It was found from electrochemical measurements that catalytic HER activity per unit Pt shows a maximum at Pt-30 in the range of n = 1-45. Taking into account the electron affinities of Pt NCs measured by gas-phase anion photoelectron spectroscopy, the reaction mechanism of HER is deduced: the size-specific HER activity originates from the matching of energy levels of Pt NCs with the band structure of SrTiO3 surfaces.

• 单位
  浙江科技学院