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Preparation and application of MXene quantum dot activated one-dimensional TiO2 nano composite photoanode

A nanocomposite and quantum dot technology, applied in photosensitive devices, photovoltaic power generation, electrolytic capacitors, etc., can solve the problems of reducing the recombination efficiency of photogenerated carriers and restricting high-efficiency applications, achieving strong electrostatic bonding, not easy to fall off, and improving stability. sexual effect

Active Publication Date: 2021-09-24
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 After being excited by light, its photogenerated carriers will undergo rapid recombination, thus limiting its efficient application in the field of photoelectrocatalysis.
In this regard, in the past decade, a lot of work has been devoted to reducing TiO 2 The photogenerated carrier recombination efficiency of

Method used

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  • Preparation and application of MXene quantum dot activated one-dimensional TiO2 nano composite photoanode
  • Preparation and application of MXene quantum dot activated one-dimensional TiO2 nano composite photoanode
  • Preparation and application of MXene quantum dot activated one-dimensional TiO2 nano composite photoanode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] One-dimensional TiO activated by MXene quantum dots 2 Preparation of nanocomposite photoanode:

[0042] Prepare a polytetrafluoroethylene high-temperature reactor liner with a capacity of 50 ml, add 15 ml of ultrapure water and 15 ml of concentrated hydrochloric acid into it, and stir for 5 min at a speed of 1000 r / min. Subsequently, 0.45ml of tetrabutyl titanate was added dropwise into the inner container, followed by stirring for 15 minutes until the solution in the inner container became clear. Slowly immerse the cleaned FTO glass against the inner wall of the liner with the conductive surface facing down in the prepared precursor solution, and place the liner in a high-temperature stainless steel reaction kettle, and heat it at 150°C for 12 hours. After the water heating is over, take out the FTO glass in the liner, rinse it several times with deionized water, and blow it dry with nitrogen. It can be found that a layer of white substance, namely TiO2, grows on the ...

Embodiment 2

[0047] Referring to the one-dimensional TiO activated by the MXene quantum dots of Example 1 2 Preparation method of nanocomposite photoanode, TiO 2 / (PDDA / MQDs) 6 Multilayer composite photoanode.

[0048] In order to prove that PDDA and MQDs have a synergistic effect on the photoelectric performance as components in the composite photoanode, the two are indispensable, so as a comparison, a single PDDA and a single MXene quantum dot are also formed in the form of 6 layers load to TiO 2 On the nanorod substrate, a binary composite photoanode TiO 2 / (PDDA) 6 and TiO 2 / (MQDs) 6 , and use the following method to test.

[0049] By electrochemical workstation, and under simulated sunlight, the TiO 2 / (PDDA / MQDs) 6 ,TiO 2 / (PDDA) 6 ,TiO 2 / (MQDs) 6 and pure TiO 2 These four photoanode samples were tested by IPCE, and TiO 2 / (PDDA / MQDs) 6 It has the largest incident photon-to-current conversion efficiency, which can reach 16%.

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Abstract

The invention belongs to the technical field of photoelectrode material preparation and photoelectrocatalysis, and particularly relates to preparation and application of an MXene quantum dot activated one-dimensional TiO2 nano composite photoanode. MXene quantum dots, non-conjugated polyelectrolyte PDDA and a one-dimensional TiO2 nanorod array are combined together in an electrostatic layer-by-layer self-assembly mode to form a multi-layer heterojunction photoanode, and is applied to photoelectrocatalytic water decomposition. According to the preparation method, the MXene quantum dots are used for activating the one-dimensional TiO2 nanostructure coated with the polyelectrolyte for the first time, the prepared photoanode has efficient photoelectrocatalysis capacity, and the loading capacity of the MXene quantum dots can be achieved by regulating and controlling the number of self-assembly layers. The whole preparation process is simple, the design principle is reliable, and sustainable development of the environment and energy is facilitated.

Description

technical field [0001] The invention belongs to the technical field of photoelectrode material preparation and photoelectric catalysis, and in particular relates to a one-dimensional TiO activated by MXene quantum dots 2 Preparation method of nanocomposite photoanode and its application in photocatalytic water splitting. Background technique [0002] In the early 1970s, Fujishima and Honda in Japan first discovered TiO 2 It can be used for photocatalytic decomposition of water to produce hydrogen. Since then, semiconductor photocatalysis and photoelectrocatalytic decomposition of water for hydrogen production have begun. [0003] For existing metal oxide semiconductors, TiO 2 Due to their good chemical stability, non-toxicity and low cost, they are widely used as benchmark semiconductors for photocatalytic reactions. One-dimensional nanostructured TiO grown directly from a conductive substrate 2 Most typically, their structural advantages are highly ordered nanostructure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01G9/042
CPCH01G9/20H01G9/2031H01G9/2022Y02E10/542
Inventor 肖方兴李申朱诗成
Owner FUZHOU UNIV
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