Iodine element double-site doped perovskite catalyst material and preparation method thereof

A perovskite and catalyst technology, which is applied in the field of iodine element double-site doped perovskite catalyst materials and its preparation, can solve the problems of inability to improve OER performance, achieve excellent OER performance and stability, and improve performance significantly. obvious effect

Active Publication Date: 2021-05-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the single-point doping method cannot greatly improve the OER performance.
Moreover, no method has been proposed to synergistically regulate the B-site active site and increase oxygen vacancies through anion and cation doping strategies at the same time.

Method used

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  • Iodine element double-site doped perovskite catalyst material and preparation method thereof
  • Iodine element double-site doped perovskite catalyst material and preparation method thereof
  • Iodine element double-site doped perovskite catalyst material and preparation method thereof

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preparation example Construction

[0032] combine figure 1 , the preparation method of a kind of iodine element two-site doped perovskite electrocatalyst of the present invention, comprises the steps:

[0033] Step 1: Preparation of gel: Weigh the metal salt required for the synthesis of perovskite in a beaker in a certain proportion, add a certain amount of ethylenediaminetetraacetic acid and citric acid, adjust the pH value with ammonia water, and stir the mixed solution to obtain a transparent liquid. The liquid was stirred and heated at a temperature of 90-95 °C, and finally a transparent gel was obtained.

[0034] Step 2: Preparation of perovskite: anneal the gel prepared in step 1 in the air environment, the annealing temperature is 900 ℃, 2~3 h, the heating rate is 2 ℃ / min, and named as AB 1-x o 3-δ .

[0035] Step 3: Preparation of iodine element double-site doped perovskite: AB prepared in step 2 1-x o 3-δ Perovskite and I 2 Vacuum-sealed annealing at a mass ratio of 15:1, the annealing temperatu...

Embodiment 1

[0040] Step 1: Weigh 0.2613 g (1 mmol) barium nitrate, 0.2237 g (1 mmol) strontium acetate, 0.4190 g (1.44 mmol) cobalt nitrate and 0.1454 g (0.36 mmol) ferric nitrate in a beaker, add 30 ml deionized water Stir until dissolved, then add 1.168 g (4 mmol) ethylenediaminetetraacetic acid and 0.84 g (4 mmol) citric acid and adjust the pH to ~8 with ammonia water to obtain a purple transparent solution. Heated in a water bath with stirring at 95 °C for 6 h until a transparent purple gel was formed.

[0041] Step 2: Transfer the transparent purple gel to a crucible, and calcinate in an air atmosphere in a muffle furnace at a high temperature at a temperature of 900 °C for 2 h, and the heating rate of the muffle furnace is 2 °C / min to obtain a BSCF perovskite with B-site defects mine.

[0042] Step 3: Combine the obtained BSCF perovskite with I 2 Put it into a quartz tube with a mass ratio of 15:1, vacuum seal the quartz tube, and transfer it to a muffle furnace for annealing treatm...

Embodiment 2

[0046] Carry out with reference to the step in embodiment 1. In step 1, weigh strontium acetate and cobalt nitrate in a beaker according to a certain proportion, add a certain amount of ethylenediaminetetraacetic acid and citric acid, adjust the pH value to ~8 with ammonia water, and stir the mixed solution to obtain a purple transparent liquid. The liquid was stirred and heated at a temperature of 90-95 °C, and finally a transparent purple gel was obtained. Combine the obtained SCO perovskite with I 2 Put it into a quartz tube with a mass ratio of 15:1, vacuum seal the quartz tube, and transfer it to a muffle furnace for annealing treatment. The annealing temperature is 1000 °C for 5 h, and the heating rate is 2 °C / min. The resulting sample was designated I-SCO. Figure 7 XPS data of iodine elements in SCO and I-SCO perovskites are presented, Figure 8 The LSV diagrams of the iodine element double-site doped perovskite electrocatalysts SCO and I-SCO at 1 M KOH are shown, ...

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Abstract

The invention belongs to the technical field of nano materials, and relates to an iodine element double-site doped perovskite catalyst material and a preparation method thereof, and the preparation method comprises the following steps: carrying out vacuum tube sealing and annealing treatment on perovskite and I2 to obtain the catalyst material. The prepared catalyst has a good improved electrochemical performance and can be applied to the field of catalytic materials.

Description

technical field [0001] The invention relates to an iodine element double-site doped perovskite catalyst material and a preparation method thereof, belonging to the field of nanometer material preparation. Background technique [0002] With the intensification of the global energy crisis, the development of various new energy conversion and storage systems is becoming more and more important. One of the methods to create new energy is electrocatalytic water splitting (2H 2 O = 2H 2 + O 2 ). Oxygen evolution (OER) is considered to be a critical rate-limiting step in the electrochemical process of water splitting because it involves a four-electron transfer reaction that requires a high overpotential to complete the reaction. Perovskite electrocatalysts (ABO 3-δ ; A is an alkaline earth metal / rare earth metal, B is a transition metal, and δ is an oxygen vacancy) has the characteristics of adjustable A and B elements, low cost and high stability, and can replace noble metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/091
CPCC25B1/04Y02E60/36
Inventor 熊攀刘一凡朱俊武付永胜孙敬文张文超吴赟炎刘超黄洪澜
Owner NANJING UNIV OF SCI & TECH
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