2023 Fiscal Year Final Research Report
Study on acceleration of mass transfer through phosphate-based functional groups immobilized on photocatalyst surface
| Project/Area Number |
21H01715
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 27030:Catalyst and resource chemical process-related
|
|---|
| Research Institution | Shinshu University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2021-04-01 – 2024-03-31
|
| Keywords | 光触媒 / 水分解 / リン酸系官能基 / マストランスファー / シランカップリング修飾 |
|---|
| Outline of Final Research Achievements |
A novel approach accelerating reactant supply in the vicinity of the photocatalytic active sites was proposed, intended for improved photocatalytic hydrogen evolution activity. Modification of silane coupling reagent containing phosphonate groups on the surface of photocatalytic particles enhanced the hydrogen evolution activity regardless of the identity of the photocatalytic materials employed. Based on the pH dependence of reaction and the electrochemical measurements such as hydrodynamic voltammetry, the mechanisms related to the promotion of photocatalytic reaction through the phosphonate groups were discussed. It was revealed that buffering effects of the phosphonate groups suppressed the pH gradient near the photocatalysts during the reaction, and that the phosphonate groups effectively served as a mediator for supplying protons, resulted in the boosted hydrogen evolution reaction.
|
| Free Research Field |
触媒化学
|
| Academic Significance and Societal Importance of the Research Achievements |
「光触媒的な水分解反応」と一口に言っても、半導体内部での物理的な過程、触媒表面で進行する化学反応、反応物の拡散など、タイムスケールの大きく異なる複数プロセスの関与する複雑な反応系である。これまでの「光触媒研究」では、主として半導体光触媒粉末や助触媒微粒子などの材料そのものの開発が中心的であった。溶液内での反応物供給も全体での反応速度に影響しうるはすだが、光触媒反応におけるこうした物理化学現象の制御はこれまで試みられてこなかった。光触媒／溶液界面のごく近傍のみにおける反応物供給過程の制御を可能にする本研究コンセプトは、光触媒研究における新たなアプローチになり得ると期待できる。
|
