Preparation method of Co2P/NPC electrocatalyst

An electrocatalyst, 2·6H2O technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of low electron transfer efficiency, poor bifunctionality, and high OER overpotential, and achieve the effect of improving oxygen reduction performance.

Active Publication Date: 2020-01-03
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty in making N-C and Co 2 Efficient complexation of P, while achieving ORR / OER bifunctional activity, in the presence of ORR4e - Problems with low electron transfer efficiency and high OER overpotential, thus poor bifunctionality

Method used

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  • Preparation method of Co2P/NPC electrocatalyst
  • Preparation method of Co2P/NPC electrocatalyst
  • Preparation method of Co2P/NPC electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add 0.1gC 14 h 14 N 3 SO 3 Na was added to 120mL ultrapure water, and added in an ice-water bath with stirring

[0019] Add 0.48g FeCl 3 ·6H 2 O, add 0.2mL C 4 h 5 N; add 57.3mg (NPCl 2 ) 3 , kept stirring for 24 hours in the dark under normal temperature conditions, and obtained the precursor polypyrrole after suction filtration, washing and drying;

[0020] (2) Put 60mg polypyrrole in 0.29g Co(NO 3 ) 2 ·6H 2 O ultrapure aqueous solution (10ml)

[0021] Sonicate for 20min, let stand for 12h, centrifuge, wash and dry; place the obtained sample in a place containing 0.082g C 4 h 6 N 2 The ultrapure aqueous solution (10ml) was allowed to stand for 12h, then centrifuged, washed and dried. The obtained sample was placed in the center of the tube furnace for 900 oC High temperature pyrolysis for 1h, to obtain Co 2 P / NPC electrocatalyst. In this step, the annealing atmosphere is high-purity Ar, and the heating rate of the tube furnace is 10 o C / min.

...

Embodiment 2

[0025] (1) Add 0.1gC 14 h 14 N 3 SO 3 Na was added to 120mL of ultrapure water, and 0.48g of FeCl was added in an ice-water bath with stirring 3 ·6H 2 O, add 0.2mL C 4 h 5 N; add 57.3mg (NPCl 2 ) 3, kept stirring for 24 hours in the dark under normal temperature conditions, and obtained the precursor polypyrrole after suction filtration, washing and drying;

[0026] (2) Put 60mg polypyrrole in 0.29g Co(NO 3 ) 2 ·6H 2 Ultrapure aqueous solution (10ml) of O was ultrasonicated for 20min, allowed to stand for 5h, centrifuged, washed and dried; 4 h 6 N 2 The ultrapure aqueous solution (10ml) was allowed to stand for 5h, then centrifuged, washed and dried. The obtained sample was placed in the center of the tube furnace for 900 oC High temperature pyrolysis for 1h, to obtain Co 2 P / NPC electrocatalyst. In this step, the annealing atmosphere is high-purity Ar, and the heating rate of the tube furnace is 10 o C / min.

[0027] Figure 5 For the Co prepared under this...

Embodiment 3

[0029] (1) Add 0.1g C 14 h 14 N 3 SO 3 Na was added to 120mL of ultrapure water, and 0.48g of FeCl was added in an ice-water bath with stirring 3 ·6H 2 O, add 0.2mL C 4 h 5 N; add 57.3mg (NPCl 2 ) 3 , kept stirring in the dark for 24 hours at room temperature, and filtered, washed, and dried to obtain the precursor polypyrrole; put 60 mg of polypyrrole in 0.29 g of Co(NO 3 ) 2 ·6H 2 O ultrapure aqueous solution (10ml) sonicated for 20min, let stand for 2h, centrifuged, washed and dried; the obtained sample was placed in 0.082g C 4 h 6 N 2 Stand in ultrapure aqueous solution (10ml) for 2h, centrifuge, wash and dry. The obtained sample was placed in the center of the tube furnace for 900 oC High temperature pyrolysis for 1h, to obtain Co 2 P / NPC electrocatalyst. In this step, the annealing atmosphere is high-purity Ar, and the heating rate of the tube furnace is 10 o C / min.

[0030] Figure 7 For the Co prepared under this example 2 The ORR stability diagram ...

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Abstract

The invention provides a preparation method of a Co2P / NPC electrocatalyst. The preparation method comprises the following steps: adding methyl orange into ultrapure water, adding ferric chloride hexahydrate (FeCl3.6H2O) under the condition of ice-water bath, sequentially adding pyrrole (C4H5N) and phosphonitrilic chloride trimer (NPCl2)3, carrying out stirring continuously for 24 hours under a dark condition, and carrying out suction filtration, washing and drying to obtain precursor polypyrrole; putting the polypyrrole into ultrapure water containing cobalt nitrate hexahydrate (Co(NO3)2.6H2O)for ultrasonic treatment, and letting the mixture to stand; carrying out centrifuging and drying, putting an obtained sample into ultrapure water containing dimethylimidazole (C4H6N2) for standing, and centrifuging, washing and drying the sample; and putting the sample in a tubular furnace, and calcining the sample at high temperature in an inert atmosphere to obtain the Co2P / NPC electrocatalyst.The catalyst has excellent oxygen reduction / precipitation electrocatalytic activity.

Description

technical field [0001] The present invention relates to a Co 2 The invention discloses a preparation method of P / NPC electrocatalyst, which belongs to the application field of oxygen reduction / precipitation. Background technique [0002] Electrocatalysis plays a central role in clean energy conversion technologies (fuel cells and metal-air batteries), and oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are key processes in these technologies. Since these two reactions are four-electron transfer processes, the slow kinetics severely limit the energy conversion efficiency. Therefore, the development of cost-effective oxygen electrode catalysts is urgently needed. Precious metals Pt / C, RuO 2 and IrO 2 It is currently recognized as a high-performance oxygen electrocatalyst, but high cost, low storage capacity, and poor durability severely limit their large-scale commercial application. In addition, Pt / C has excellent ORR performance but poor OER performan...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9083Y02E60/50
Inventor 孙盼盼张丹左壮田良愉孙小华黄妞
Owner CHINA THREE GORGES UNIV
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