2019 Fiscal Year Annual Research Report
光触媒的二酸化炭素還元のための共有結合性有機構造体を利用した単一原子触媒の創製
| Project/Area Number |
19J23268
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| Research Institution | Kyoto University |
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Principal Investigator |
李 展召 京都大学, 理学研究科, 特別研究員(DC1)
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| Project Period (FY) |
2019-04-25 – 2022-03-31
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| Keywords | nanocrystals / cation exchange / heterostructures / phase transformation |
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| Outline of Annual Research Achievements |
In this year, I have synthesized various ionic metal sulfide nanocrystal (NC) heterostructures as efficient light absorbers firstly. We succeeded in synthesizing roxbyite Cu1.8S nanoparticles with various shape, proceeding cation exchange (CE) reaction with several kinds of transition metal cations (Co2+、Mn2+、Zn2+、Ni2+), and also achieving controlled the amount of cations exchanged heterostructure NCs (Cu1.8S/Co9S8 NRs, Cu1.8S/CoS NPLs, Cu1.8S/MnS NRs, Cu1.8S/MnS NPLs, Cu1.8S/Ni3S4 NRs, Cu1.8S/Ni3S4 NPLs, Cu1.8S/ZnS NRs, Cu1.8S/ZnS NPLs). Additionally, we found that the CE of Cu1.8S NCs with Co2+ gave the different cobalt sulfide phases in different shaped host Cu1.8S NCs.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Based on experimental results, except various ionic heterostructure nanocrystals with tuned compositions and controlled shapes were synthesized as the inorganic semiconductor materials for the photocatalytic system, we also discovered an interesting novel phenomenon that the crystal structure of the product cobalt sulfide phase transformation depends on the aspect ratio of the Cu1.8S nanocrystals as the host of Co2+ cation exchange. This phenomenon is peculiar to Co2+, but it is an extremely rare case that induces crystalline reorganization in ionic crystals under mild conditions, and may open a new way for controlling physical properties of NCs related to crystal structure. In summary, it is evaluated that progress has exceeded expectations.
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| Strategy for Future Research Activity |
In a next year, I will continue promoting my research program and utilize these synthesized heterostructure nanocrystals as photo-responsible units in hybrid photocatalytic system, such as hydrogen evolution or carbon dioxide reduction reaction. The carbon dioxide reduction system will be built and phototcatalytic activity measurement will be carried out in a gas-tight reactor with carbon dioxide saturated water irradiated with a Xe-lamp in following year.
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