Establishment of aggregation suppression technology by super-strengthening of platinum nanostructure and development to energy saving society

2023 Fiscal Year Final Research Report

• Project/Area Number: 19H02489
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26060:Metals production and resources production-related
• Research Institution: Shizuoka University
• Principal Investigator: KATO CHIKA 静岡大学, 理学部, 教授 (00360214)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: ポリオキソメタレート / 白金 / 焼成処理 / ナノ粒子 / 凝集抑制 / 光触媒 / 水素生成 / 再利用

Outline of Final Research Achievements

Two types of platinum-tungstate structures were obtained by air-calcining Keggin-type diplatinum(II)-coordinated polyoxotungstates, Cs3[α-PW11O39{cis-Pt(NH3)2}2]・8H2O (Cs-P-Pt) and Cs4[α-SiW11O39{cis-Pt(NH3)2}2]・11H2O (Cs-Si-Pt), at temperatures ranging from 700 to 900°C for 5 hours. Calcination of Cs-P-Pt resulted in a solid containing platinum nanoparticles and Cs3PW12O40, while calcination of Cs-Si-Pt produced a solid containing platinum nanoparticles and Cs4W11O35. The platinum nanoparticles in the solid obtained from calcining Cs-P-Pt exhibited an average particle size on the nanometer scale, demonstrating a significant platinum aggregation inhibitory effect. Additionally, the solids obtained through calcination showed high photocatalytic activity for hydrogen production from aqueous triethanolamine solution under visible light irradiation and were confirmed to be reusable.

Free Research Field

無機合成化学・触媒化学

Academic Significance and Societal Importance of the Research Achievements

白金凝集抑制技術の開発は固体表面への白金種の担持条件の検討を中心に進められてきたが，厳しい作動環境下での凝集抑制は十分ではなく，従来とは異なるアプローチからの技術開発が求められてきた。これに対し我々は，ポリオキソタングステートを無機配位子として用いることで，700℃～900℃という高温加熱処理条件下でも白金ナノ粒子が数ナノオーダーを維持できる白金凝集抑制技術を開発した。本技術は合成化学的アプローチによる新技術であり，学術的意義が高いだけでなく，白金が実装された装置やモジュールのコンパクト化・省エネルギー化・省資源化への貢献が期待できる。