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Preparation method of Bi/Cu catalyst for artificial photosynthesis

A catalyst, artificial light technology, applied in electrodes, electrolytic organic production, electrolysis process, etc., to achieve the effect of high CO2 reduction selectivity

Active Publication Date: 2021-02-09
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as CO 2 Reduced electrocatalytic materials, copper substrate whether as CO 2 Reduced electrocatalysts are still up for debate

Method used

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  • Preparation method of Bi/Cu catalyst for artificial photosynthesis
  • Preparation method of Bi/Cu catalyst for artificial photosynthesis
  • Preparation method of Bi/Cu catalyst for artificial photosynthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation of electrodeposition solution: 0.3153g bismuth chloride (BiCl 3 ), 1.47g sodium citrate (C 6 h 9 Na 3 o 9 ) was added into 50ml of 1.2mol / L HCl solution, and the solution was fully stirred until it was completely dissolved, and the solution was transparent to obtain an electrodeposition solution.

[0027] 2) Electrodeposition reaction: use copper foam as the cathode and a carbon rod as the anode to form a pair of electrodes, and then immerse the electrodes in the electrodeposition solution prepared in step 1) to perform a constant potential deposition reaction, and deposit a charge of about 3C to obtain Bi / Cu catalyst.

[0028] C must be added as described in step 1) 6 h 9 Na 3 o 9 And the amount of its substance should be guaranteed to be much larger than that of BiCl 3 amount of substance.

[0029] The concentration of the HCl solution described in step 1) should be more than 1mol / L and be stirred rapidly, preferably the HCl solution of 1.2mo...

Embodiment 2

[0035] What this embodiment provides is Bi / Cu catalyst pretreatment method, and described preparation method comprises the following steps:

[0036] 1) Pretreatment: immerse the Bi / Cu catalyst prepared above into 25mL of 0.5mol / L KHCO 3 The solution is used as the working electrode, Ag / AgCl is used as the reference electrode, platinum wire is used as the counter electrode, and saturated CO is passed into the H-type electrolytic cell. 2 The gas was subjected to 50 cycles of scanning cyclic voltammetry to obtain the prepared catalyst.

[0037] The voltage range of the scanning cyclic voltammetry step in step 1) is 0-1.2V vs. RHE, and the bismuth-copper stoichiometric ratio of the catalyst ranges from 9:1 to 1:1.

[0038] Such as figure 2 Shown is the SEM image of the pretreated Bi / Cu catalyst prepared in this example. It can be seen that the pretreated coral-like structure transforms into a flake-like structure with an average nanosheet size of 0.9 μm. XRD and XPS patterns sh...

Embodiment 3

[0041] What this embodiment provides is the CO of Bi / Cu catalyst artificial photosynthesis 2 Reduction performance testing method, described preparation method comprises the following steps:

[0042] 1) Artificial photosynthesis performance test: the pretreated Bi / Cu electrode was used as the working electrode, the Ag / AgCl was used as the reference electrode, and the platinum wire was used as the counter electrode. 2 Gas 25mL 0.5mol / L KHCO 3 CO in solution for artificial photosynthesis 2 Revert performance test. Including product faradaic efficiency test, current density test and stability test.

[0043] The artificially photosynthesized CO described in step 1) 2 The reduction performance test voltage range is -0.7~-1.2V vs. RHE.

[0044] Such as Figure 4 Shown is the CO of the Bi / Cu catalyst prepared in this example 2 Faradaic efficiency of reduced products and partial current density images of formic acid. It can be seen from the figure that the Bi / Cu catalyst catal...

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Abstract

The invention relates to a preparation method of a Bi / Cu catalyst for artificial photosynthesis, which comprises the following steps of preparing an electrodeposition solution: adding bismuth chlorideBiCl3 and sodium citrate C6H9Na3O9 into a hydrochloric acid solution with the concentration of 1 mol / L or above, and sufficiently stirring the solution until the BiCl3 is completely dissolved and thesolution is transparent, thereby obtaining the electrodeposition solution, and electro-deposition reaction: forming a pair of electrodes by taking foamy copper as a cathode and a carbon rod as an anode, then immersing the electrodes into the prepared electrodeposition solution, carrying out constant-potential deposition reaction, and depositing 3-6 C charge quantity to obtain the Bi / Cu catalyst.Due to the fact that replacement reaction occurs under the acidic condition, Cu on the surface of the copper substrate is replaced into a solution and then deposited on the substrate again, and the coralline Bi / Cu catalyst with copper as a framework is formed. The Bi / Cu catalyst prepared through artificial photosynthesis has very high CO2 reduction selectivity.

Description

technical field [0001] The invention belongs to electrocatalytic CO 2 In the field of reduction technology, it specifically relates to a method for preparing a Bi / Cu catalyst for artificial photosynthesis. Background technique [0002] With the expansion of the territory of human exploration, manned deep space exploration has become a hot spot in current international space activities. It must solve the basic material and energy requirements faced by the extraterrestrial survival process. "Artificial photosynthesis" can not only realize O in confined spaces 2 Recycling, and CO can be used 2 In-situ resources produce fuel to realize human survival outside the earth and support sustainable manned deep space exploration missions. The core lies in the design of suitable catalysts to improve the efficiency of oxygen production and the reduction of CO 2 Selectivity and efficiency of reduction. [0003] as a potential CO 2 Immobilization technology, electrocatalytic reduction...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B3/26C25B3/21
Inventor 李梦璐姚颖方李文博宋文涛吴聪萍邹志刚
Owner NANJING UNIV
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