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Efficient vanadium nitride/molybdenum carbide heterojunction hydrogen production electrocatalyst and preparation method and application thereof

An electrocatalyst and heterojunction technology, which is applied in the direction of electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of affecting the electron transmission rate of electrodes, difficult to control the morphology, and poor conductivity, so as to promote synergistic catalytic effect and easy control , good stability

Pending Publication Date: 2022-06-21
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among the above-mentioned non-noble metal catalysts, vanadium nitride has good electrical conductivity, thermal conductivity and catalytic performance. 2 The desorption has a strong auxiliary effect, but its synthesis temperature is high and its morphology is difficult to control; molybdenum carbide has excellent catalytic performance and hydrogen binding energy, which is beneficial to H + Adsorption, but the conductivity is poor, which affects the electron transfer rate on the electrode

Method used

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  • Efficient vanadium nitride/molybdenum carbide heterojunction hydrogen production electrocatalyst and preparation method and application thereof
  • Efficient vanadium nitride/molybdenum carbide heterojunction hydrogen production electrocatalyst and preparation method and application thereof
  • Efficient vanadium nitride/molybdenum carbide heterojunction hydrogen production electrocatalyst and preparation method and application thereof

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Effect test

preparation example Construction

[0040] Figure 5 It is the nanometer VN / Mo that embodiment 3 prepares 2 The hydrogen production performance graph of C at pH 14, when the current density is 10mA / cm 2 , when the scan rate is 3mV / s, the overpotential of the sample is 95mV, indicating that it has excellent hydrogen production performance.

[0041] Example 4

1) Weigh melamine, ammonium metavanadate and ammonium molybdate tetrahydrate according to the mass ratio of 20:3:1.

2) Dry mix the above powders and grind them in an agate mortar for 20 minutes, put them into a porcelain boat, place the porcelain boat in a tube-type atmosphere furnace, and put two furnace plugs at each end of the tube with an interval of 5cm.

3) Introduce argon gas into the tube, and then carry out 6 times of pumping and replenishing air, even though the air inside is exhausted, and do not pump after the last gas replenishment. Pass in an inert protective atmosphere (argon) at a flow rate of 40 sccm, raise the temperature to 400°C at 5...

Embodiment 1

[0049] Comparative example 3

[0050] When the composite material is prepared with thiocyanic acid: ammonium metavanadate: ammonium molybdate tetrahydrate according to the mass ratio of 19:5:3, the XRD of the sample is as follows Figure 14 As shown, it can be seen that VN and Mo 2 The diffraction peak of C matches well with the standard card, but the intensity of the diffraction peak of VN is very weak, indicating that the nitrogen content of carbon and nitrogen homologous compounds is below 30%, which is not conducive to the formation of VN. Figure 15 is the TEM image of the sample, VN and Mo can be seen in different parts of the sample 2 C lattice stripes, no heterojunction structure was found. Combined with XRD and TEM analysis, it can be seen that when the nitrogen content of carbon and nitrogen homologous compounds is below 30%, the formation of VN is affected, and VN and Mo are also not formed. 2 The heterojunction structure of C affects the catalytic performance of...

Embodiment 2

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Abstract

The invention discloses an efficient vanadium nitride / molybdenum carbide heterojunction hydrogen production electrocatalyst and a preparation method and application thereof. The electrocatalyst has a heterojunction structure formed by coupling VN and Mo2C, wherein the mass ratio of VN to Mo2C is (20: 1)-(50: 1). According to the catalyst, nano VN and Mo2C are coupled to form a VN / Mo2C heterojunction, so that active centers are increased, the balance of H < + > adsorption / H2 desorption kinetics is facilitated, and the activity of the catalyst is improved to a great extent.

Description

technical field [0001] The invention belongs to the field of nano powder catalytic materials, in particular to a high-efficiency VN / Mo 2 C heterojunction hydrogen production electrocatalyst and its preparation method and application. Background technique [0002] With the increasingly prominent issue of fossil energy, mankind is facing a new round of opportunities and challenges. As a green, recyclable and abundant resource, hydrogen energy has attracted more and more attention from scholars. Although platinum group metals (PFMs) have excellent catalytic performance, the drawbacks of platinum-based catalysts, such as high price, low content, and instability, seriously hinder their global application. Exploring excellent catalysts for hydrogen production is the key technical point of water splitting for hydrogen production. [0003] In recent years, researchers have discovered some important non-noble metal catalysts, such as transition metal carbides (TMCs) and transition...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/091
CPCC25B1/04Y02E60/36C25B11/091C25B11/052C25B11/065C23C18/1275C23C18/1283C23C18/1204C25B11/067
Inventor 黄剑锋李帅楠冯亮亮曹丽云冯永强何丹阳冯李张晓
Owner SHAANXI UNIV OF SCI & TECH
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