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Molybdenum carbide catalyst and preparation method thereof

A molybdenum carbide and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of decreasing the number of active sites and low specific surface area, etc.

Active Publication Date: 2019-10-22
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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  • Molybdenum carbide catalyst and preparation method thereof
  • Molybdenum carbide catalyst and preparation method thereof
  • 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. According to the present invention, MoC nanoparticles with high specific surface area are successfully prepared by using space-limited pyrolysis, and a transition metal Ni is introduced into the system so as to significantly improve the hydrogen evolution catalytic activity of the MoC catalyst; in an acidic medium (0.5 M H2SO4 solution) and an alkaline medium (1 M KOH solution), the overpotentials of the catalyst at a current density of 10 mA / cm<2> respectively are 138 mV and 136 mV; and after the catalyst is subjected to constant potential electrolysis for 12 h in an acidic medium, the current density is decreased from 80 mA / cm<2> to 60 mA / cm<2>, and is decreased by about 25%, such that the catalyst hasgood 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 Applications(China)
IPC IPC(8): B01J27/22C25B1/04C25B1/02C25B11/06C25B11/03C25B11/12
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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