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Preparation of a zif-67/bismuth vanadate composite and its application as a photoanode material

A ZIF-67, composite technology, applied in electrodes, electrolysis components, electrolysis processes, etc., can solve problems such as MOF stability limitations

Active Publication Date: 2021-02-05
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Despite their many advantages, the applications of many MOFs are ultimately limited by their stability under harsh conditions

Method used

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  • Preparation of a zif-67/bismuth vanadate composite and its application as a photoanode material
  • Preparation of a zif-67/bismuth vanadate composite and its application as a photoanode material
  • Preparation of a zif-67/bismuth vanadate composite and its application as a photoanode material

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Embodiment Construction

[0027] The preparation of the ZIF-67 / BiVO4 composite material of the present invention and its application as a photoanode in water splitting and hydrogen production will be further described below through specific examples.

[0028] (1) Preparation of BiVO4: It was prepared according to the method of electrodeposition combined with heat treatment by Kim and Choi's research group. Specific steps: firstly, BiOI nanosheets were prepared by electrodeposition using CHI 660D electrochemical workstation. FTO glass cleaned ultrasonically with acetone / isopropanol / distilled water (volume ratio: 1:1:1) was used as the working electrode, the Ag / AgCl (3.5 M KCl) electrode was used as the reference electrode, and the Pt electrode was used as the counter electrode. with 6M HNO 3 Adjust the pH of 50 mL0.4 M KI solution to 1.5~1.7, then add 0.970g Bi(NO 3 ) 3 • 5H 2 O until dissolved and the solution color changed to orange-red. Then slowly add 20ml 0.498 g 1,4-benzoquinone ethanol solut...

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Abstract

The invention discloses a preparation of ZIF-67 / bismuth vanadate composite material, which is to combine 2-methylimidazole and Co(NO 3 ) 2 ·6H 2 O dissolved in N,N-dimethylformamide-distilled water, and BiVO 4 The membrane is placed in it and soaked for a period of time; then it is completely washed with distilled water and ethanol, and dried to obtain the final product. The present invention successfully loads ZIF-67 onto BiVO by in-situ deposition method 4 surface, forming a stable ZIF‑67 / BiVO 4 film material. At high bias, ZIF‑67 / BiVO 4 Composite than pure / BiVO 4 There is a higher photocurrent; at the same time, the introduction of ZIF‑67 prolongs the lifetime of carriers and improves the BiVO 4 photocatalytic performance. Through the photocurrent corresponding test and the photoelectric injection efficiency calculation, it is proved that the composite photoelectrode has excellent photocatalytic performance, and it can effectively improve the hydrogen production efficiency when used as a photoanode material.

Description

technical field [0001] The invention relates to the preparation of a bismuth vanadate composite electrode film, in particular to a ZIF-67 / BiVO 4 The preparation method of the photoelectric catalysis composite material is mainly used as a photoelectric anode material in the reaction of hydrogen production by photoelectrochemical water splitting. Background technique [0002] At present, the massive use of fossil fuels has led to problems such as global climate change and environmental degradation. And all these issues have become the main driving force to accelerate the transition from renewable energy to clean energy. Therefore, the utilization of solar energy, the largest renewable energy source, has received extensive attention, and among the various solar energy conversion options that are widely available, utilizing photoelectrolysis to split water and generate hydrogen by solar energy is one of the most promising technologies. So far, many semiconductor materials have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/054C25B11/067C25B11/087C25B11/085C25B1/04
CPCC25B1/04C25B1/55C25B11/051C25B11/057C25B11/075Y02E60/36
Inventor 王其召周诗仟佘厚德王磊黄静伟
Owner NORTHWEST NORMAL UNIVERSITY
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