Method for detecting whether photocatalytic efficiency of photocatalytic material is influenced by accumulated charges
A technology of photocatalytic material and detection method, applied in the field of detection and design of semiconductor nanocomposite photocatalytic system
Active Publication Date: 2021-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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[0006] The object of the present invention is to provide a method for introducing additional charges into the nanomaterial-charge acceptor molecule composite system to form a three-body method, so as to solve the unavoidable three-body state pair in the above-mentioned multi-charged photocatalytic reaction system. Uncovered scientific issues such as the influence of subsequent charge extraction efficiency
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[0022] In the method described in this example, using the pump-pump-probe three-pulse transient detection technology in the semiconductor nanomaterial system to introduce additional charges to form a three-body method, first of all, it is necessary to select a composite model system of semiconductor nanomaterials-high-efficiency charge acceptors. We use The CdSe@CdS DIR-Pt composite system serves as our verification system. So how does this composite material system realize the introduction of additional charges into the nanomaterial to form a three-body state? We need to use optical detection methods to verify it. The verification detection is mainly carried out from the following three aspects:
[0023] Preparation of CdSe@CdS DIR-Pt system: by first synthesizing CdSe (Cd and Se molar ratio 1:1) quantum dot seeds with a particle size of 3.5 nanometers, growing 11.4-13.6 nanometers in length and 3.1-3.9 nanometers in diameter on it CdS nanorods (the molar ratio of CdS and CdS...
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The invention provides a method for detecting whether the photocatalytic efficiency of a photocatalytic material is influenced by accumulated charges, through a method of introducing additional charges into a semiconductor nanomaterial to form a tribody (Trion), the growth of CdS nanorods of a specific length with CdSe QDs as seeds is achieved, and the method of introducing accumulated charges into the Dot-in-rod (DIR) nano-heterojunction system where metal Pt particles are grown in a section of the rod is adopted, essential factors for limiting the final charge injection efficiency in the heterojunction system are further analyzed, and direct detection and verification are provided for fundamental reasons behind the efficiency bottleneck existing in the photocatalytic reaction based on a semiconductor material.
Description
technical field [0001] The patent of the present invention belongs to the technical field of detection and design of semiconductor nanocomposite material photocatalytic system, and in particular relates to a method for introducing additional charge into a nanomaterial system to form a three-body state (exciton combined with an additional charge). Background technique [0002] It is well known that conversion processes from solar energy to fuels (e.g. water splitting, CO 2 Reduction, nitrogen fixation, etc.) are usually involved in multi-charged photocatalytic reactions. In these reactions, nanoscale light-harvesting materials need to absorb multiple solar photons in succession, with each photon being absorbed driving an efficient charge separation from the light-harvesting material to the catalyst. Although the photocatalytic efficiency of these nanofunctional material systems has been gradually improved, most of the reported catalytic efficiencies are still in the order of...
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IPC IPC(8): G01N21/63
CPCG01N21/636Y02E60/36
Inventor 吴凯丰王俊慧丁韬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI