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Nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst and preparation method thereof

A cobalt selenide electrocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of complex preparation steps, high cost, poor safety, etc., and achieve simple preparation steps, low cost, The effect of cost security

Pending Publication Date: 2019-12-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of complex preparation steps, high cost and poor safety of the existing doped cobalt selenide electrocatalytic hydrogen evolution catalyst, and provides a nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst and its preparation method

Method used

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  • Nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst and preparation method thereof
  • Nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst and preparation method thereof
  • Nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst and preparation method thereof

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specific Embodiment approach 1

[0021] Specific embodiment 1: The nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst of this embodiment has the general chemical formula of Co x Ni y Se 2 , X = 0.6 ~ 0.8, y = 0.1 ~ 0.35.

specific Embodiment approach 2

[0022] Specific embodiment two: The preparation method of nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst described in specific embodiment one is carried out according to the following steps:

[0023] 1. Press Co x Ni y Se 2 The stoichiometric ratio of selenium powder, Co(NO 3 ) 2 ·6H 2 O and Ni (NO 3 ) 2 ·6H 2 O, Co x Ni y Se 2 Where x = 0.6 ~ 0.8, y = 0.1 ~ 0.35; then weigh potassium hydroxide solution, EDTA-2Na and ultrapure water;

[0024] 2. Dissolve selenium powder in potassium hydroxide solution, stir for 25~35min, add Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O, EDTA-2Na and ultrapure water, continue to stir for about 1~1.5h to obtain a mixed solution;

[0025] 3. Transfer the mixture to a Teflon reaction kettle, react for 10-16h at a temperature of 160-200℃, and cool to room temperature naturally;

[0026] 4. The black precipitate obtained by the reaction is washed with water and ethanol in turn, and then placed in a vacuum oven at 60-65°C for 12-15 hour...

specific Embodiment approach 3

[0027] Specific embodiment three: This embodiment is different from the specific embodiment two in that the concentration of the potassium hydroxide solution described in step one is 20-25 mol / L; the other is the same as the specific embodiment two.

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Abstract

The invention discloses a nickel-doped cobalt selenide electrocatalytic hydrogen evolution catalyst and a preparation method thereof, and relates to an electrocatalytic hydrogen evolution catalyst anda preparation method thereof. The invention aims to solve the technical problems of complex preparation steps, high cost and poor safety of existing cobalt selenide-doped electrocatalytic hydrogen evolution catalysts. The general chemical formula of the catalyst is CoxNiySe2, wherein x is in a range of 0.6-0.8, and y is in a range of 0.1-0.35. The preparation method comprises the following steps:dissolving selenium powder in a potassium hydroxide solution, then adding Co(NO3)2.6H2O, Ni(NO3)2.6H2O, ethylene diamine tetraacetic acid-2Na (EDTA-2Na) and ultrapure water, carrying out uniform stirring to obtain a mixed solution, transferring the mixed solution into a reaction kettle for a hydrothermal reaction, and then carrying out cleaning and drying to obtain the catalyst. The overpotentialof the catalyst reaches 170-195 mV VS RHE, and after 1000 circles of continuous cyclic voltammetry tests, a polarization curve is almost overlapped with an initial curve, so that stability is high, and the catalyst can be used in electrocatalytic hydrogen evolution reactions.

Description

Technical field [0001] The invention relates to an electrocatalytic hydrogen evolution catalyst and a preparation method thereof. Background technique [0002] With the development of the global economy, fossil fuels are gradually depleted. At the same time, environmental problems such as air pollution caused by the burning of fossil fuels force people to look for clean and renewable solar, wind, biomass, and hydrogen energy. Among these new energy sources, hydrogen has a wide range of sources, the product of combustion is pollution-free water, and the energy produced per unit mass of hydrogen is larger than other energy sources, and the energy utilization rate is high, so it has received extensive attention. However, the electrolysis of water to produce hydrogen has a slow kinetic process and often requires a high overpotential. Therefore, a hydrogen evolution reaction catalyst is required to reduce the high energy consumption required in the electrolysis process and realize an ...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/02C25B1/04C25B11/06
CPCB01J27/0573C25B1/04C25B11/091B01J35/33B01J35/40Y02E60/36
Inventor 姜再兴方晓娇郑文慧李阳阳
Owner HARBIN INST OF TECH
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