Pt@Ni-SNT/graphene hydrogen evolution catalyst as well as preparation method and application thereof

A catalyst and graphene technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as limiting large-scale applications, high cost, and scarce reserves , to achieve the effect of preventing growth and loss, improving dispersion, large economy and social value

Active Publication Date: 2020-07-24
西安旭旌再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, among various electrode materials, Pt electrode has the best catalytic hydrogen evolution activity, but its scarce reserves and high cost limit its large-scale application

Method used

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  • Pt@Ni-SNT/graphene hydrogen evolution catalyst as well as preparation method and application thereof
  • Pt@Ni-SNT/graphene hydrogen evolution catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of 5wt% Pt@Ni-SNT / Graphene Hydrogen Evolution Catalyst

[0026] (1) 2g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 80ml deionized water, and excess ammonia solution was added dropwise, so that the solution first formed a precipitate, and then the precipitate gradually dissolved. Under magnetic stirring, 0.4mol / l Na was added dropwise. 2 SiO 3 The solution formed a precipitate, wherein the molar ratio of Ni to Si was 0.3; 3wt% polyvinylpyrrolidone was added, and the stirring was continued for 2h, and the resulting mixture was transferred into a polytetrafluoroethylene-lined hydrothermal reactor, and reacted at 180°C for 24h, naturally Cool to room temperature, centrifuge, wash with deionized water and ethanol several times, dry at 150°C, and bake at 350°C to obtain Ni-SNT;

[0027] (2) Disperse the obtained Ni-SNT in an appropriate amount of ethanol, add 0.3M chloroplatinic acid solution, in which the molar ratio of Pt to Ni is 1: 1; ultrasonic 1.5h, so that chl...

Embodiment 2

[0029] 3wt% Pt@Ni-SNT / graphene

[0030] (1) 2g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 80ml deionized water, and excess ammonia solution was added dropwise, so that the solution first formed a precipitate, and then the precipitate gradually dissolved. Under magnetic stirring, 0.2mol / l Na 2 SiO 3 The solution forms a precipitate, wherein the molar ratio of Ni to Si is 0.2; add 3wt% polyvinylpyrrolidone, continue to stir for 0.5h, transfer the resulting mixture into a polytetrafluoroethylene-lined hydrothermal reactor, and react at 220°C for 16h, Naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol several times, dried at 150°C, and calcined at 350°C to obtain Ni-SNT;

[0031](2) Disperse the obtained Ni-SNT in an appropriate amount of ethanol, add 0.3M chloroplatinic acid solution, in which the molar ratio of Pt to Ni is 0.85; ultrasonic 2h, so that chloroplatinic acid is fully filled in the Ni-SNT silicate nano Add 8g / l graphene oxide di...

Embodiment 3

[0033] Electrochemical tests of the catalysts were performed using an electrochemical workstation.

[0034] The electrolyte solution used was 0.5M H 2 SO 4 Solution, the test temperature is room temperature, the test system is a conventional three-electrode system, the Pt wire electrode is used as the counter electrode, and the Ag / AgCl (10wt% KCl) electrode is used as the reference electrode. All potentials in the test results are adjusted relative to the potential of the reversible hydrogen electrode (vs. RHE). The scanning speed of the linear sweep voltammetry (LSV) test is 5mV / s. Before the measurement, the electrodes are scanned 100 times by cyclic voltammetry at a scanning speed of 50mV / s. figure 2 That is the cyclic voltammetry polarization (LSV) curve of the hydrogen evolution catalyst obtained in Examples 1 and 2 of the present invention, as a comparison, also adopt the 5wt% PtNi alloy / graphene hydrogen evolution catalyst recorded in the literature and the commercia...

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Abstract

The invention relates to a Pt@Ni-SNT/graphene hydrogen evolution catalyst as well as a preparation method and application thereof, and belongs to the technical field of water electrolysis hydrogen production. Ni-silicate nanotubes are prepared through an in-situ one-step hydrothermal method, Pt nanoparticles are coated with the tube walls of the Ni-silicate nanotubes through the confinement effectof the silicate nanotubes, and the Pt nanoparticles are compounded with graphene. The silicate nanotubes can effectively prevent growth and loss of the Pt nanoparticles, the dispersity of the Pt nanoparticles is greatly improved, Pt and transition metal Ni can form a synergistic effect, and the hydrogen evolution activity of the catalyst is further improved. The catalyst obtained by the inventionhas excellent hydrogen evolution activity when the loading capacity of noble metal is relatively low (5wt%); and the overpotential at the current density of 10 mA/cm < 2 > is 167 mV, is obviously superior to that of PtNi alloy/graphene with the same loading capacity, and is close to that of commercial 20 wt% Pt/C, and the Pt@Ni-SNT/graphene hydrogen evolution catalyst has great economic and social values.

Description

technical field [0001] The invention relates to a Pt@Ni-SNT / graphene hydrogen evolution catalyst and a preparation method and application thereof, belonging to the technical field of hydrogen production by electrolysis of water. Background technique [0002] The electrolytic water process is easy to form industrialization because of its high efficiency. It is the most promising method for hydrogen production. It has the characteristics of simple operation, high product purity, no pollution and economical source of raw materials. Electrolyzed water is to decompose water by passing direct current through acidic or alkaline aqueous solution, hydrogen gas is precipitated at the cathode, and oxygen gas is precipitated at the anode. The theoretical voltage required for water electrolysis is 1.23 V, which is temperature-dependent. However, in practical applications, the voltage required for water decomposition is higher than this theoretical value, and the additional voltage requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10C25B11/06C25B1/04
CPCB01J23/892B01J35/0033B01J35/1004C25B1/04C25B11/04Y02E60/36
Inventor 孙占仑
Owner 西安旭旌再生资源有限公司
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