Precise synthesis of photoreaction system based on creation of solid interface in nano-controlled space

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K14315
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: University of Yamanashi
• Principal Investigator: Takashima Toshihiro 山梨大学, 大学院総合研究部, 准教授 (60644937)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 人工光合成 / 光触媒 / 水素 / ナノ構造

Outline of Final Research Achievements

Precise control of the interface in a solid-state heterojunction Z-scheme photocatalyst is important for achieving the intended photocatalytic activity. In this study, we have designed a photocatalyst with a hierarchical structure by photodepositing gold nanoparticles on the surface of bismuth vanadate and then loading zinc rhodium oxide on the gold surface. Owing to the controlled hierarchical structure, photoexcited electrons generated in bismuth vanadate smoothly transferred to zinc rhodium oxide through the gold nanoparticles. Utilizing the thus-constructed Z-scheme photocatalyst, the simultaneous evolution of hydrogen and oxygen from water at a molar ratio of 2:1 was achieved under irradiation with visible light.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

全固体Z-スキーム光反応系を構築するには二種類の光触媒の間に金属ナノ粒子を挿入した接合構造を的確に構築する必要があるが、これまで一般的に三種類以上の無機ナノ粒子を順序良く並べることは非常に困難であった。そこで本研究では、光触媒による金属イオンの光還元を利用して一方の光触媒表面に選択的に金属ナノ粒子を析出させ、これを介してもう一方の光触媒と接合させることで接合構造の制御を実現した。そして、この制御により可視光のもとで水を分解し、水素を生成することに成功した。