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MoP/C composite nanomaterial for alkaline electrocatalytic hydrogen evolution

A nano-material and carbon composite technology, which is applied in the direction of catalyst activation/preparation, chemical/physical process, physical/chemical process catalyst, etc., can solve the problems of poor electrocatalytic hydrogen evolution performance, high cost of raw material preparation, poor product stability, etc., to achieve Good hydrogen evolution performance, good catalytic effect, easy recovery effect

Inactive Publication Date: 2018-11-02
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many methods, none of them have made through holes, and the electrocatalytic hydrogen evolution performance is poor because there are few reactive sites. The molybdenum phosphide composite materials currently obtained have poor electrocatalytic hydrogen evolution performance, poor product stability, short service life, and poor conductivity. , not easy to recycle, the cost of raw materials for preparation is high, and the preparation process has serious environmental pollution problems that need to be solved urgently

Method used

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  • MoP/C composite nanomaterial for alkaline electrocatalytic hydrogen evolution
  • MoP/C composite nanomaterial for alkaline electrocatalytic hydrogen evolution
  • MoP/C composite nanomaterial for alkaline electrocatalytic hydrogen evolution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the Erlenmeyer flask, weigh 2.48g ammonium molybdate tetrahydrate (NH 4 ) 6 Mo 7 o 24 .4H 2 Add 40ml of uniform deionized water containing 3.28ml of aniline solution to dissolve it, pass through 99.99% nitrogen for protection, the gas flow rate is 25ml / min, at the same time, use microwave to heat to 50 ° C, and then slowly add 1mol / L Adjust the pH value to 4.0 with dilute hydrochloric acid solution, keep at 50 degrees Celsius for 4h to obtain the Mo-MOF precursor intermediate, and then wash with distilled water and ethanol solution respectively for 3 times (the mass of the Mo-MOF precursor intermediate, distilled water and ethanol : volume: volume = 1:45:45), and then centrifuged at 2500 rpm for 15 minutes, and then freeze-dried. Mo-MOF precursors. Transfer the Mo-MOF precursor to the alumina ark, and weigh 2g of sodium hypophosphite in another alumina ark and place it upstream of the tube furnace, 17cm away from the MOF precursor, at 100ml / min with a volume fra...

Embodiment 2

[0036] In the Erlenmeyer flask, weigh 2.48g ammonium molybdate tetrahydrate (NH 4 ) 6 Mo 7 o 24 .4H 2 Add 40ml of uniform deionized water containing 3.28ml of aniline solution to dissolve it, pass through 99.99% nitrogen for protection, the gas flow rate is 20ml / min, at the same time, use microwave to heat to 45°C, and then slowly add 0.8mol / L dilute hydrochloric acid solution to adjust the pH value to 4.5, keep at 45°C for 6h to obtain the Mo-MOF precursor intermediate, and then wash with distilled water and ethanol solution for 3 times respectively (the Mo-MOF precursor intermediate, distilled water and ethanol (mass: volume: volume = 1:40:40), and then centrifuged at 1500 rpm for 15 minutes, and then freeze-dried. The freeze-drying temperature is -45°C, the vacuum is 50Pa, and the drying time is 48h. A precursor containing Mo-MOF is obtained. Transfer the Mo-MOF precursor to the alumina ark, and weigh 2g of sodium hypophosphite in another alumina ark and place it upst...

Embodiment 3

[0039] In the Erlenmeyer flask, weigh 2.48g ammonium molybdate tetrahydrate (NH 4 ) 6 Mo 7 o 24 .4H 2 Add 40ml of uniform deionized water containing 3.28ml of aniline solution to dissolve it, pass through 99.99% nitrogen for protection, the gas flow rate is 30ml / min, at the same time, use microwave to heat to 55 ° C, and then slowly drop 1.2mol / L dilute hydrochloric acid solution to adjust the pH value to 3.5, keep at 55°C for 3h to obtain the Mo-MOF precursor intermediate, and then wash with distilled water and ethanol solution for 3 times respectively (the Mo-MOF precursor intermediate, distilled water and ethanol (mass: volume: volume = 1:40:40), and then centrifuged at 3000 rpm for 10 minutes, and then freeze-dried. The freeze-drying temperature is -55°C, the vacuum is 10Pa, and the drying time is 48h. A precursor containing Mo-MOF is obtained. Transfer the Mo-MOF precursor to the alumina ark, and weigh 2g of sodium hypophosphite in another alumina ark and place it u...

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Abstract

The invention discloses a MoP / C composite nanomaterial for alkaline electrocatalytic hydrogen evolution. Through holes which are arranged regularly are formed in nanowires, the holes are arranged in parallel in one direction, the diameter of the holes is 0.8-1 nm, and the surface of the nanowires is wrapped with a uniform C layer with the thickness of 3-4 nm. The whole experiment process is simpleand convenient to operate, mass production of the product is facilitated, the obtained product has regular through holes of 0.8-1 nm, the C layer of 2-4 nm thick is arranged on the surface, and diffusion of H2 is facilitated; the C layer on the surface facilitates charge transport, has a good catalytic effect on electrocatalytic hydrogen evolution and shows good hydrogen evolution performance inan alkaline solution, the initial voltage of electrocatalytic hydrogen evolution is 26 mVvsRHE, the current density can reach 10 mA / cm<2> when overpotential is 78 mV, the product has good stability, the current density is reduced by 1% or below within 14 h under the constant voltage pf 120 mV, and the nanomaterial has the stable through hole structure, has no collapse, is good in conductivity andeasy to recover and has broad application prospects in energy development and storage.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanomaterials and energy development and storage, and specifically relates to a molybdenum phosphide / carbon composite nanomaterial used for alkaline electrocatalytic hydrogen evolution and a preparation method thereof. Background technique [0002] With the rapid expansion of population and the rapid development of industry, energy issues have become the primary issues affecting human production and life. In order to solve the global energy shortage problem, the electrochemical splitting of water to produce hydrogen has received more and more attention. Noble metals such as platinum (Pt) and its alloys are currently the most commonly used catalysts for electrocatalytic hydrogen production due to their low potential and high electrochemical stability in acidic solutions. However, it has the disadvantages of high cost and scarce resources, which hinder its practical application. Especially in an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/19B01J35/00B01J35/10B01J37/08B01J37/10B01J37/28
CPCB01J27/19B01J37/086B01J37/10B01J37/28C25B1/02B01J35/33B01J35/643Y02E60/36
Inventor 刘碧桃陈文波姚昱岑彭玲玲韩涛李晨马秀玲向敏
Owner CHONGQING UNIV OF ARTS & SCI
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