NiCoAl-LDH-modified ferric oxide composite photoanode material and preparation method and application thereof

An anode material, composite light technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, electrodes, etc., can solve problems such as low charge transfer rate, corrosion of electrolytic cell equipment, and reduced gas purity , to achieve the effect of good catalytic activity, easy operation and abundant resources

Active Publication Date: 2017-10-20
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is Fe 2 o 3 The large-scale application brings the following problems: (1) The strong alkaline electrolyte will cause serious corrosion to the electrolyzer equipment; (2) The long-term use of the alkaline electrolyte will absorb a large amount of CO 2 , resulting in the destruction of battery performance; (3) In the photoelectrochemical water splitting system, alkali vapor is mixed into H 2 Moderate and reduce the purity of the gas produced
Although CoAl-LDH has excellent electrochemical activity, it has poor electrical conductivity, resulting in a low charge transport rate inside the material.

Method used

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  • NiCoAl-LDH-modified ferric oxide composite photoanode material and preparation method and application thereof
  • NiCoAl-LDH-modified ferric oxide composite photoanode material and preparation method and application thereof
  • NiCoAl-LDH-modified ferric oxide composite photoanode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of NiCoAl-LDH modified Fe 2 o 3 The preparation method of composite light anode, it comprises the steps:

[0034] (a) Fe 2 o 3 Preparation of Electrode Sheets

[0035] Weigh 1.0812 g of FeCl 3 Put 0.5405 g of urea in a 100 mL beaker, add 50 mL of deionized water to dissolve it; then place the cleaned FTO substrate in the beaker, seal it and place the beaker in an oven at 100°C for 4 h; cool to room temperature, remove. Then it was washed with deionized water, dried at 80°C for 12 h; finally put into a muffle furnace for calcination at 500°C for 3 h, after cooling, it was annealed in a muffle furnace at 750°C for 15 min to obtain Fe 2 o 3 electrode sheet;

[0036] (b) Ni 2.5 co 0.5 Al-LDH / Fe 2 o 3 Preparation of composite photoanode

[0037] Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, according to [Ni 2+ +Co 2+ ] / Al 3+ The molar ratio is 3:1, Ni 2+ / Co 2+ The molar ratio is 5:1, the total concentration of metal ions ...

Embodiment 2

[0039] A kind of NiCoAl-LDH modified Fe 2 o 3 The preparation method of composite light anode, it comprises the steps:

[0040] (a) Fe 2 o 3 Preparation of Electrode Sheets

[0041] Prepared according to the method and conditions of step (a) in Example 1;

[0042] (b) Ni 2.25 co 0.75 Al-LDH / Fe 2 o 3 Preparation of composite photoanode

[0043] Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, according to [Ni 2+ +Co 2+ ] / Al 3+ The molar ratio is 3:1, Ni 2+ / Co 2+ The molar ratio is 3:1, the total concentration of metal ions is 20 mmol / L, added to 25 mL deionized water, and stirred until completely dissolved. Then add a certain amount of urea and NH to the solution 4 F, make its concentration respectively 50 mmol / L and 20 mmol / L, stir until completely dissolved. Finally, transfer the above solution to a 50mL hydrothermal kettle, and put the Fe prepared in step (a) at the same time 2 o 3 The electrode sheet was sealed and placed in an ov...

Embodiment 3

[0045] A kind of NiCoAl-LDH modified Fe 2 o 3 The preparation method of composite light anode, it comprises the steps:

[0046] (a) Fe 2 o 3 Preparation of Electrode Sheets

[0047] Prepared according to the method and conditions of step (a) in Example 1;

[0048] (b) Ni 2 CoAl-LDH / Fe 2 o 3 Preparation of composite photoanode

[0049] Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, according to [Ni 2+ +Co 2+ ] / Al 3+ The molar ratio is 3:1, Ni 2+ / Co 2+ The molar ratio is 2:1, the total concentration of metal ions is 20 mmol / L, added to 25 mL deionized water, and stirred until completely dissolved. Then add a certain amount of urea and NH to the solution 4 F, make its concentration respectively 50 mmol / L and 20 mmol / L, stir until completely dissolved. Finally, transfer the above solution to a 50mL hydrothermal kettle, and put the Fe prepared in step (a) at the same time 2 o 3 The electrode sheet was sealed and placed in an oven at 100 °C...

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Abstract

The invention relates to a preparation method of a NiCoAl-LDH-modified ferric oxide composite photoanode material. The preparation method comprises the specific steps that 1), Ni(NO3)2, Co(NO3)2 and Al(NO3)3 are dissolved into deionized water and prepared into a mixed salt solution, and the total molar concentration of the mixed salt solution ranges from 0.010 mol / L to 0.200 mol / L; 2), urea and NH4F are added to the mixed salt solution, wherein the molar concentration of the urea ranges from 0.025 mol / L to 0.500 mol / L, and the concentration of NH4F ranges from 0.010 mol / L to 0.200 mol / L; 3), the mixed solution obtained in second step is transferred into a hydrothermal kettle, and a Fe2O3 electrode plate is put into the hydrothermal kettle, a constant-temperature reaction is conducted in a drying oven at the temperature of 80-150 DEG C for 1-6 hours, taking-out is conducted after the reaction is completed, washing and drying are conducted, and then the NiCoAl-LDH-modified ferric oxide composite photoanode material is obtained. According to the preparation method, FTO loaded with Fe2O3 serves as a substrate, the in-situ growth of the NiCoAl-LDH activity protection layer is conducted through a hydrothermal method, the conductivity of a catalyst is improved, and the separation and migration of a photon-generated carrier are promoted; meanwhile active sites are provided for oxidation of water or biomass, and the reaction overpotential is lowered effectively; and migration from H+ to the solution can be promoted as well, the Fe2O3 hydrolysis is inhibited, and the stability of the NiCoAl-LDH-modified ferric oxide composite photoanode material is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and photoelectrochemical catalysis, and in particular relates to a NiCoAl hydrotalcite-modified Fe 2 o 3 Composite photoanode material, preparation method and photoelectrocatalytic application in photoelectric water splitting anodic oxygen evolution reaction in neutral electrolyte and photoanodic oxidation biomass reaction in photoassisted fuel cell. Background technique [0002] With the increasing demand for clean and sustainable energy, the research and development of efficient, low-cost and environmentally friendly solar energy conversion systems has become a research hotspot. Inspired by the photosynthesis of plants in nature, human beings have successfully realized the storage and conversion of solar energy by using solar energy to drive water splitting or solar energy to oxidize biomass for power generation. Among them, the photoelectrochemical cell system is one of the ideal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B1/04B01J23/755H01M4/86H01M4/88H01M4/90
CPCB01J23/002B01J23/755B01J35/0033B01J2523/00C25B1/04C25B11/04C25B1/55H01M4/8657H01M4/8846H01M4/9016B01J2523/31B01J2523/842B01J2523/845B01J2523/847Y02E60/36Y02E60/50
Inventor 种瑞峰常志显王广王宝云张凌高欢李趁意
Owner HENAN UNIVERSITY
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