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Synthesis method and application of hollow oxide/phosphide carbon-coated composite material for electrocatalytic hydrogen production

A composite material and synthesis method technology, applied in the field of electrocatalysis, can solve problems such as poor catalytic activity, achieve good universality, inhibit segregation growth, and improve utilization rate

Inactive Publication Date: 2020-01-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although after years of research, the HER catalytic activity of transition metal phosphides used in acidic conditions has been greatly improved, but the catalytic activity in alkaline conditions is still poor, which contradicts the development of commercial electrolytic cells in alkaline conditions. More mature and the other half-reaction (OER) exhibits higher catalytic activity under alkaline conditions
Therefore, tuning the catalytic activity of transition metal phosphides in alkaline conditions is very valuable but challenging.

Method used

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  • Synthesis method and application of hollow oxide/phosphide carbon-coated composite material for electrocatalytic hydrogen production
  • Synthesis method and application of hollow oxide/phosphide carbon-coated composite material for electrocatalytic hydrogen production
  • Synthesis method and application of hollow oxide/phosphide carbon-coated composite material for electrocatalytic hydrogen production

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Synthetic H-CeO 2 / Ni@NC-0.8

[0024] First, 0.15g of hollow cerium oxide powder was dispersed in a mixed solution of ethanol / deionized water (30 / 30mL), sonicated for 0.5 hours and then injected 1mL of ammonia (25%) and stirred at room temperature for ten minutes, and then added 0.8 g nickel nitrate hexahydrate and 0.25 g dopamine hydrochloride powder, the mixed solution was stirred at room temperature for 6 hours, centrifuged and washed three times, and then dried under vacuum at 60°C. Then the obtained brown-black powder was kept in argon atmosphere at 750℃ for 2 hours, and finally the precursor H-CeO was obtained. 2 / Ni@NC powder. After low-temperature phosphating treatment to obtain H-CeO 2 / Ni 2 P@NC-0.8.

Embodiment 2

[0026] Synthetic H-CeO 2 / Ni@NC-0.4

[0027] Firstly, 0.15g of hollow cerium oxide powder was dispersed in a mixed solution of ethanol / deionized water (30 / 30mL), sonicated for 0.5 hours and then injected with 1mL ammonia (25%) and stirred at room temperature for ten minutes, followed by adding 0.4 g nickel nitrate hexahydrate and 0.25 g dopamine hydrochloride powder, the mixed solution was stirred at room temperature for 6 hours, centrifuged and washed three times, and then dried under vacuum at 60°C. Then the obtained brown-black powder was kept in argon atmosphere at 750℃ for 2 hours, and finally the precursor H-CeO was obtained. 2 / Ni@NC powder. After low-temperature phosphating treatment to obtain H-CeO 2 / Ni 2 P@NC-0.4.

Embodiment 3

[0029] Synthetic H-CeO 2 / Ni@NC-1.6

[0030] Firstly, 0.15g of hollow cerium oxide powder was dispersed in a mixed solution of ethanol / deionized water (30 / 30mL), sonicated for 0.5 hours and then injected 1mL ammonia (25%) and stirred at room temperature for ten minutes, and then added 1.6 in sequence g nickel nitrate hexahydrate and 0.25 g dopamine hydrochloride powder, the mixed solution was stirred at room temperature for 6 hours, centrifuged and washed three times, and then dried under vacuum at 60°C. Then the obtained brown-black powder was kept in argon atmosphere at 750℃ for 2 hours, and finally the precursor H-CeO was obtained. 2 / Ni@NC powder. After low-temperature phosphating treatment to obtain H-CeO 2 / Ni@NC-1.6.

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Abstract

The invention belongs to the technical field of electrocatalysis, and discloses a synthesis method of a hollow oxide / phosphide carbon-coated composite material for electrocatalytic hydrogen production. The synthesis method mainly comprises the following steps: synthesizing nano silicon dioxide particles; synthesizing hollow nano cerium dioxide; synthesizing H-CeO2 / Ni@NC; and synthesizing a targetproduct H-CeO2 / Ni@NC. According to the invention, a transition metal oxide is used for regulating and controlling transition metals, so that rapid water molecule dissociation and hydrogen removal reaction are realized, and efficient catalytic hydrolysis hydrogen production reaction is realized. The hollow cerium dioxide nanospheres are composed of octahedral sub-nano cerium dioxide particles, so that the hollow cerium dioxide nanospheres have the porous characteristic, and electrolyte and gas transmission is faster; the hollow structure can expose a larger specific surface area, so that the utilization rate of active sites is improved.

Description

Technical field [0001] The invention belongs to the technical field of electrocatalysis, and specifically relates to the synthesis of a ternary heterogeneous structure catalyst material with a carbon nano-layer coated hollow ceria nanosphere surface loaded with nickel phosphide nanoparticles and its use in hydrolysis and hydrogen production. application. Background technique [0002] Hydrogen is an energy carrier with high energy density, clean combustion and pollution-free, while electrocatalytic hydrolysis is a large-scale and sustainable hydrogen production method. However, the main reasons hindering the large-scale application of hydrogen production by electrocatalytic hydrolysis are due to the high price of commercial electrocatalysts, low catalytic activity, and insufficient stability to meet industrial needs, which severely restricts the development of hydrogen production technology by electrolysis of water. There is an urgent need to develop materials with low cost, low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/08B01J37/00B01J37/08B01J37/10B01J37/28C25B1/04C25B11/06
CPCB01J27/24B01J37/28B01J37/0018B01J37/082C25B1/04C25B11/073B01J35/33B01J35/51Y02E60/36
Inventor 张彪何春年赵乃勤师春生刘恩佐
Owner TIANJIN UNIV
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