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Self-supporting phosphating nickel nanomaterial for hydrogen production with electrocatalytic decomposition of water and preparation method of self-supporting phosphating nickel nanomaterial

A technology of nanosheets and nickel phosphide, applied in chemical instruments and methods, electrolytic processes, electrolytic components, etc., can solve the problems of few active sites and poor stability, and achieve simple operation, good stability, and good stability Effect

Inactive Publication Date: 2017-06-09
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a self-supporting material in which nickel phosphide nanosheets are directly grown on the surface of a nickel mesh substrate and a preparation method thereof, in an attempt to overcome the disadvantages of poor stability and few active sites of existing catalysts

Method used

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  • Self-supporting phosphating nickel nanomaterial for hydrogen production with electrocatalytic decomposition of water and preparation method of self-supporting phosphating nickel nanomaterial
  • Self-supporting phosphating nickel nanomaterial for hydrogen production with electrocatalytic decomposition of water and preparation method of self-supporting phosphating nickel nanomaterial
  • Self-supporting phosphating nickel nanomaterial for hydrogen production with electrocatalytic decomposition of water and preparation method of self-supporting phosphating nickel nanomaterial

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The commercial nickel mesh (1×3 cm in size) was washed successively with ethanol, acetone and deionized water, and then dried at 100° C. for 12 hours. The obtained clean nickel mesh was placed in a 50 mL reactor containing 30 mL of hydrogen peroxide (10 wt %) solution. The sealed reactor was placed at 120°C for 2 hours, and after the reaction was finished, it was naturally cooled down to room temperature. After the product was washed, it was further dried at 100°C and marked as Ni / NF. The obtained Ni / NF was confirmed to be nickel hydroxide nanosheets by XRD and SEM characterization, and it grew directly on the surface of nickel mesh. The obtained nickel mesh after oxidation etching was placed in the middle of the tube furnace, 300 mg of sodium hypophosphite was placed in the upper part of the tube furnace, under the protection of nitrogen, the nitrogen flow rate was 50 mL / min, the temperature was programmed to 350 ° C for 2 hours, and the temperature was raised The rat...

Embodiment 2

[0027] The sample NiP / NF in Example 1 was directly used as the working electrode. The electrochemical test was carried out on a computer-controlled electrochemical workstation, using a three-electrode test system, Ag / AgCl as the counter electrode, Pt wire as the working electrode, and 1.0M KOH aqueous solution as the alkaline electrolyte. The test range of the polarization curve is 0 to -0.6V for HER (vs reversible hydrogen electrode), and 1.2 to 1.7V for OER (vs reversible hydrogen electrode). image 3 with Figure 4 The linear polarization curves and Tafel curves of the synthesized catalysts are shown for the HER and OER processes, respectively.

Embodiment 3

[0029] The sample NiP / NF in Example 2 was directly used as the cathode and the anode respectively, and under the condition of the two-electrode test system, 1.0M KOH aqueous solution was used as the alkaline electrolyte. Electrochemical tests were performed on a computer-controlled electrochemical workstation. The scanning range of the electrodes is 1.1 to 2.0V. Figure 5 The linear sweep polarization curves of the synthesized catalysts are shown. It can be seen from the figure that when the voltage is 1.62V, the catalytic system can reach 10mA / cm 2 The current density of the catalyst shows the excellent electrocatalytic activity of hydrogen evolution and oxygen evolution.

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Abstract

The invention belongs to the preparation of porous nano-catalyzed materials particularly applicable to metal-based direct-growing porous nanostructured material and an electrocatalytic application thereof. The material has a multistage channel structure, nickel phosphate nanoparticles are directly grown in a nickel net based skeleton, high mechanical stability is achieved, more active sites are exposed, and shortcomings existing in preparation tediousness, poor stability, lack of the active sites and the like are overcome. A synthetic method of low-temperature subphosphate phosphating is utilized in preparation of the nanomaterial after hydrothermal oxidative etching and growing of nickel hydroxide nanopararticles by hydrogen peroxide; the nanomaterial is applied to hydrogen production with electrocatalytic decomposition of water, preparation process of electrodes is greatly simplified, stability of the catalyst is obviously improved, good catalytic hydrogen production effect is achieved, and high application value is realized; the nanomaterial is simple in adopted equipment, moderate in preparation condition, easy and cheap in acquisition of raw materials and suitable for industrialized mass production.

Description

technical field [0001] The invention relates to a preparation method of a nickel mesh-loaded nickel phosphide nanosheet catalytic material with a self-supporting structure and a relatively high active specific surface area, and applies it to the electrocatalytic decomposition of water to produce hydrogen, belonging to the field of inorganic nano catalytic materials. Background technique [0002] The widespread application of fossil energy has greatly promoted the progress of human society, but it has also caused serious environmental pollution and other adverse consequences. In order to realize the sustainable development of modern society, it is necessary to find and develop renewable green energy materials. Among them, hydrogen energy, as the best clean energy to support future economic and social development, is regarded as the most potential alternative energy in the future society. Therefore, the research on hydrogen production by electrolysis of water involved in the ...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/1853B01J35/33Y02E60/36
Inventor 袁忠勇任金涛
Owner NANKAI UNIV
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