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Three-dimensional graded FeP nanosheet hydrogen-evolution electrocatalysis material, and preparation method and application thereof

A nanosheet, three-dimensional iron phosphide technology, applied in the field of electrocatalytic hydrogen evolution, can solve the problems of limited storage capacity of platinum group noble metals, high price, unfavorable promotion, etc., and achieves the advantages of surface reaction and mass transfer, cheap materials and simple equipment. Effect

Active Publication Date: 2019-07-09
JIANGXI NORMAL UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, for the hydrogen evolution reaction process, platinum group noble metals have the best electrocatalytic activity, but the storage capacity of platinum group noble metals on the earth is limited, the price is very expensive, and they are easy to be lost during the reaction process, which is not conducive to large-scale promotion.

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  • Three-dimensional graded FeP nanosheet hydrogen-evolution electrocatalysis material, and preparation method and application thereof
  • Three-dimensional graded FeP nanosheet hydrogen-evolution electrocatalysis material, and preparation method and application thereof
  • Three-dimensional graded FeP nanosheet hydrogen-evolution electrocatalysis material, and preparation method and application thereof

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Experimental program
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Embodiment 1

[0031] (1) Preparation of three-dimensional iron oxide nanosheets:

[0032] Two iron wires (2cm long, 0.5mm diameter) were ultrasonically cleaned in acetone, absolute ethanol and deionized water for 20min in sequence; the dried iron wires were immersed in 4M NaOH aqueous solution in parallel for 0.5cm, keeping a distance of 1.5cm; for the two iron wires Apply an AC voltage of 8V, and keep the solution magnetically stirred for 60min; collect the suspended matter in the electrolyte by centrifugation, and wash it alternately with deionized water and absolute ethanol for 6 times, wherein the centrifuge speed is 8000rpm, and the time for each time is 5min; The cleaned product was dried in an oven at 70° C. for 12 hours to obtain three-dimensional iron oxide nanosheets.

[0033] figure 1 The X-ray powder diffraction (XRD) analysis revealed that all the diffraction peaks of the electrochemical stripping products from the iron wire using 8V AC voltage belonged to the maghemite crysta...

Embodiment 2

[0038] Performance test of three-dimensional iron phosphide nanosheets as a catalyst for hydrogen evolution reaction in electrolysis of water:

[0039] (1) Preparation of electrocatalyst working electrode:

[0040] Add 5 mg of three-dimensional iron phosphide nanosheet powder and 50 μl of 5wt% nafion solution into 950 μl of ethanol, and sonicate for 15 minutes; then add 1.5 mg of carbon black powder to the mixture, and continue to sonicate for 30 minutes to form a uniform catalyst ink; pipette 5 μl of catalyst ink drops Apply on the surface of glassy carbon electrode (diameter 3mm) and let it dry naturally before testing.

[0041] (2) Electrochemical performance research:

[0042] The electrochemical properties of the prepared samples were tested on a CHI 660E electrochemical workstation (Chenhua Instruments, Shanghai, China). A traditional three-electrode system was used, that is, a Pt sheet electrode as a counter electrode, a saturated calomel electrode (SCE) as a referenc...

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Abstract

The invention relates to a three-dimensional graded FeP nanosheet hydrogen-evolution electrocatalysis material, and a preparation method and application thereof, and belongs to the field of electrocatalytic hydrogen evolution. The method comprises the following steps: firstly, stripping an iron wire by adopting an alternating-current voltage to prepare a three-dimensional nanosheet iron oxide which is taken as a precursor; and then taking a sodium hypophosphite crystal as a phosphorus source to carry out a one-step heat treatment reaction in a quartz tube furnace to prepare the three-dimensional FeP nanosheet hydrogen-evolution electrocatalysis material. According to the method provided by the invention, the preparation process of the three-dimensional nanosheet iron oxide is simple and green and has a high yield; and the three-dimensional FeP nanosheet hydrogen-evolution electrocatalysis material is prepared by a simple, convenient and mild one-step low-temperature phosphating method,so that cost is low, repeatability is high, and large-scale synthesis is easy. The three-dimensional FeP nanosheet material exihibits excellent catalytic performance when being used for an electrocatalytic hydrogen evolution reaction, and when the obtaned reduction current density is 10 mA / cm<-2>, only an overpotential of 88 mV needs to be tested, the Tafel slope is only 47.7 mv*dec<-1>, and goodelectrocatalytic stability is achieved.

Description

technical field [0001] The invention belongs to the field of electrocatalytic hydrogen evolution, and in particular relates to a three-dimensional graded FeP nano sheet hydrogen evolution electrocatalytic material and its preparation method and application. Background technique [0002] With the continuous development of social economy, energy consumption has increased by leaps and bounds. At present, my country's energy consumption is still dominated by the use of non-renewable fossil fuels, which has also brought serious environmental pollution and greenhouse effect. In order to cope with the depletion of fossil fuels and the environmental problems it brings, it is urgent to find an environmentally friendly and renewable energy production model. [0003] As the cleanest energy carrier, hydrogen also has high energy density and renewable characteristics, and can be used as a new type of fuel to replace fossil fuels. Due to the advantages of simple equipment, relatively ma...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06B01J27/185B82Y30/00B82Y40/00
CPCC25B1/04B01J27/1853B82Y30/00B82Y40/00C25B11/031C25B11/075B01J35/33Y02E60/36
Inventor 郭满满屈耀辉杨勇袁彩雷邹成武俞挺
Owner JIANGXI NORMAL UNIV