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A kind of molybdenum carbide catalyst and preparation method thereof

A catalyst and electrocatalysis technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of decreased number of active sites, low specific surface area, etc. The effect of catalytic hydrogen evolution catalytic activity

Active Publication Date: 2022-01-25
HENAN UNIVERSITY
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Problems solved by technology

However, the current specific surface area of ​​molybdenum carbide electrocatalytic hydrogen evolution catalyst is low; too much carbon material covers the active sites of molybdenum atoms on the surface of molybdenum carbide during the synthesis process, which reduces the number of active sites exposed on the surface

Method used

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  • A kind of molybdenum carbide catalyst and preparation method thereof
  • A kind of molybdenum carbide catalyst and preparation method thereof
  • A kind of molybdenum carbide catalyst and preparation method thereof

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Embodiment

[0029] 1. Preparation of molybdenum carbide (MoC) particles supported on porous carbon materials (referred to as MoC@NC).

[0030] 1.1, (n-Bu 4 N) 3 [α-PMo 12 o 40 ] (referred to as PMo 12 )Synthesis.

[0031] to 2.42g Na 2 MoO 4 2H 2 O and 0.16 g NaH 2 PO 4 2H 2 In 95mL aqueous solution of O, add 4.35mL concentrated hydrochloric acid, then add 0.8g tetrabutylammonium bromide, obtain yellow precipitation. It was then filtered off with suction, washed with distilled water and ethanol, and recrystallized from acetonitrile.

[0032] 1.2. PMOs 12 Synthesis of @ZIF / C / DCA.

[0033] Take a certain amount of PMo 12 , Zn(NO 3 ) 2 ·6H 2 O dissolved in 24 mL DMF and 56 mL CH 3 OH, then take another appropriate amount of 2-methylimidazole, DCA and C to add 24mL DMF and 56mL CH 3 OH mixed solution. Then the above solution was fully mixed and stirred at room temperature for 24h to obtain a black precipitate. Wash with DMF and distilled water at least 4 times respectivel...

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Abstract

The invention provides a molybdenum carbide catalyst and a preparation method thereof. MoC nanoparticles with a high specific surface area are successfully prepared by space-confined pyrolysis, and a transition metal Ni is also introduced into the system, which significantly improves the hydrogen evolution catalytic activity of the MoC catalyst. . It is in acid medium (0.5M H 2 SO 4 solution) and alkaline medium (1M KOH solution), 10mA / cm 2 The overpotentials under the current density are 138mV and 136mV respectively, and the catalyst is electrolyzed at a constant potential in an acidic medium for 12h, and the current density is from 80mA / cm 2 down to 60mA / cm 2 , decreased by about 25%, showing better catalytic stability.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a molybdenum carbide catalyst for electrocatalyzing hydrogen evolution and a preparation method thereof. Background technique [0002] Hydrogen is a clean, efficient and sustainable new energy to replace non-renewable fossil energy. Electrocatalytic hydrogen evolution reaction (Hydrogen Evolution Reaction, HER) has become one of the most promising hydrogen production technologies due to its high efficiency and clean hydrogen production. [0003] Molybdenum carbide (MoC) has been extensively studied as a potential electrocatalytic hydrogen evolution catalyst. However, the current specific surface area of ​​molybdenum carbide electrocatalytic hydrogen evolution catalyst is low; too much carbon material covers the active sites of molybdenum atoms on the surface of molybdenum carbide during the synthesis process, which reduces the number of active sites exposed on the surface. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/031C25B11/075C25B11/091
CPCB01J27/22C25B1/02C25B1/04C25B11/057C25B11/031C25B11/051C25B11/075Y02E60/36
Inventor 张超张梦锐王冠范世杰
Owner HENAN UNIVERSITY
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