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Electrocatalyst D-Mo2TiC2/Ni nanosheet as well as preparation method and application thereof

An electrocatalyst, nanosheet technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high price of platinum and limited implementation of scarcity, and achieve excellent HER kinetics, strong catalytic activity and stability, low charge Effect of transfer resistance

Pending Publication Date: 2022-01-04
XIJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high price and scarcity of platinum greatly limit its implementation in practical applications

Method used

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  • Electrocatalyst D-Mo2TiC2/Ni nanosheet as well as preparation method and application thereof
  • Electrocatalyst D-Mo2TiC2/Ni nanosheet as well as preparation method and application thereof
  • Electrocatalyst D-Mo2TiC2/Ni nanosheet as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An electrocatalyst D-Mo 2 TiC 2 The preparation method of / Ni nano sheet, this method comprises:

[0034] (1) Defect Mo 2 TiC 2 Synthesis of Nanosheets:

[0035] Mo 2 TiAlC 2 by mixing Mo (0.2 mol), Ti (0.1 mol), Al (0.11 mol) and C (graphite, 0.2 mol) in a glove box and internal grinding for 30 min. Then, the mixture was sealed in a quartz tube in an Ar environment and heated at 1600 °C for 4 h in a tube furnace. Afterwards, the annealed product was ground with a mortar / pestle to obtain Mo 2 TiAlC 2 .

[0036] Mo 2 TiC 2 Nanosheets chemically etched Mo 2 TiAlC 2 Synthesis, as follows:

[0037] Under magnetic stirring, the Mo 2 TiAlC 2 The powder (0.5 g) was added to a solution of HCl (50 mL, 9 mol / L) containing LiF (5 g). The suspension was transferred to a mechanically equipped autoclave (one atmosphere) and stirred at 60°C for 10 days. Finally, the product was washed 5 times with deionized water to obtain Mo 2 TiC 2 Nanosheets.

[0038] Defect Mo ...

experiment example 1

[0047] Experimental Example 1 Electrochemical Test

[0048] Electrochemical tests were performed on an electrochemical workstation (CHI 600E, CH Instrument) with a three-electrode system (counter electrode: graphite rod; reference electrode: SCE, saturated calomel electrode; working electrode).

[0049] The working electrode was carbon paper with catalyst slurry coating. Wherein, the catalyst slurry was obtained by mixing the catalyst (2 mg), Nafion (80 μL, 6 wt %) and ethanol (1 mL) and sonicating for 1 h. Drop 0.25mL of catalyst slurry on carbon paper (0.7cm x 0.7cm), the amount of catalyst is about 1mg / cm 2 , and then evaporate the ethanol in a vacuum chamber at room temperature. Pt / C (40%) catalyst powders are commercially available.

[0050] Polarization curves were obtained at a scan rate of 5 mV / s and pH=2. To determine the electrochemical capacitance, CV measurements were performed at the open circuit potential at scan rates ranging from 10 to 1000 mV / s. The EIS s...

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Abstract

The invention discloses an electrocatalyst D-Mo2TiC2 / Ni nanosheet as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out chemical etching on Mo2TiAlC2 to obtain a Mo2TiC2 nanosheet; (2) taking Mo2TiC2 nanosheet coated carbon paper as a working electrode, taking a graphite rod as a counter electrode, taking a saturated calomel electrode as a reference electrode, and repeating cathode polarization circulation to obtain D-Mo2TiC2; (3) dispersing D-Mo2TiC2 in deionized water to form a suspension liquid; (4) adding a Ni<2+> aqueous solution into the suspension, and carrying out solid-liquid separation to obtain a solid Ni<2+> / D-Mo2TiC2; and (5) mixing Ni<2+> / D-Mo2TiC2 with urea, and conducting annealing at 800 DEG C in an inert gas environment to obtain the electrocatalyst. The electrocatalyst can be used for catalyzing hydrogen evolution reaction and has high catalytic activity and stability.

Description

technical field [0001] The invention relates to an electrocatalyst, in particular to an electrocatalyst D-Mo 2 TiC 2 / Ni nanosheet and its preparation method and application. Background technique [0002] The extensive use of fossil fuels has a history of more than 200 years, which has led to severe energy crises and global warming in recent decades. It is increasingly urgent to find sustainable and clean alternative fuels for human survival. The energy density of hydrogen is as high as 140MJ / kg, and only water is produced after combustion. It is considered to be the most promising clean energy. The typical way to produce hydrogen today is to convert natural gas or coal into steam, but it still relies heavily on fossil fuels. Methods for sustainable hydrogen production are still being developed, such as the hydrogen evolution reaction (HER) for splitting water. Electrochemical hydrogen evolution technology for electrocatalytic water splitting has attracted extensive atte...

Claims

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Application Information

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IPC IPC(8): C25B11/052C25B11/091C25B1/04
CPCC25B11/052C25B11/091C25B1/04Y02E60/36
Inventor 朱艳芳
Owner XIJING UNIV
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