Homogeneous AuNi alloy catalytic material and preparation method thereof

A technology of catalytic materials and alloys, applied in the field of electrocatalysis, can solve the problems of low efficiency of electrocatalytic reduction of carbon dioxide catalyst, cumbersome preparation process, side reactions of hydrogen evolution, etc., and achieve excellent performance of electrocatalytic reduction of carbon dioxide, excellent specific surface area, reduced preparation cost effect

Active Publication Date: 2020-04-17
JIANGNAN UNIV
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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a homogeneous AuNi alloy catalytic material and its preparation method, which can effectively overcome the shortcomings of low electrocatal

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  • Homogeneous AuNi alloy catalytic material and preparation method thereof
  • Homogeneous AuNi alloy catalytic material and preparation method thereof
  • Homogeneous AuNi alloy catalytic material and preparation method thereof

Examples

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[0044] Example 1

[0045] (1) Preparation of catalytic material Au 1 Ni 1 / CNFs:

[0046] Weigh 0.412g of chloroauric acid and 0.291g of nickel nitrate, that is, the molar ratio of gold to nickel is 1:1, add them to 15g of 20% polyvinyl alcohol / N,N-dimethylformamide solution, and use Magnetic stirring produces a uniform and transparent solution.

[0047] Electrospinning is used to spin the above solution, control the spinning positive electrode voltage to 15kV, set the distance between the positive electrode and the receiver to 20cm, and the solution pushing speed to 0.2mL / min to obtain the nanometer containing gold salt and nickel salt. Fiber membrane.

[0048] The 0.8g nanofiber membrane is sandwiched between graphite sheets and placed in a tube furnace. Step-wise heating and pre-oxidation are carried out in an air atmosphere at the following temperature and holding time: 80℃-4h, 100℃-4h , 120℃-4h, 140℃-4h, 160℃-4h, 180℃-4h, so that the fiber membrane can form a stable structure a...

Example Embodiment

[0060] Example 2

[0061] (1) Preparation of catalytic material Au 1 Ni 3 / CNFs:

[0062] Weigh 0.412g of chloroauric acid and 0.873g of nickel nitrate, that is, the molar ratio of gold to nickel is 1:3, add them to 15g of polyvinylpyrrolidone / N,N-dimethylformamide solution with a mass fraction of 20%, and use Magnetic stirring produces a uniform and transparent solution.

[0063] Electrospinning is used to spin the solution, the voltage of the spinning positive electrode is controlled to 18kV, the distance between the positive electrode and the receiver is set to 25cm, and the solution pushing speed is 0.3mL / min, that is, a gold salt and nickel salt containing Nanofiber membrane.

[0064] The 0.8g nanofiber membrane is sandwiched between graphite sheets, placed in a tube furnace, and stepped heating pre-oxidation treatment is carried out at the following temperature in an air atmosphere: 80℃-4h, 100℃-4h, 120℃ -4h, 140℃-4h, 160℃-4h, 180℃-4h, so that the fiber membrane can form a sta...

Example Embodiment

[0068] Example 3

[0069] (1) Preparation of catalytic material Au 3 Ni 1 / CNFs:

[0070] Weigh 0.247g of chloroauric acid and 0.058g of nickel nitrate, that is, the molar ratio of gold to nickel is 3:1, add them to 15g of 20% polyacrylonitrile / N,N-dimethylformamide solution, and use Magnetic stirring produces a uniform and transparent solution.

[0071] The rest of the preparation method is the same as in Example 1.

[0072] (2) Performance characterization of catalytic reduction of carbon dioxide:

[0073] The test method is the same as that in Example 1.

[0074] Catalytic material Au 3 Ni 1 / CNFs catalytic reduction of carbon dioxide performance such as image 3 (a), 3(b) shown by image 3 (a) It can be seen that the catalytic material Au 3 Ni 1 The CO optimal Faraday efficiency of / CNFs is 80%, which is determined by image 3 (b) It can be concluded that the catalytic material Au 3 Ni 1 / CNFs current density is 3.7mA cm -2 .

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Abstract

The invention discloses a homogeneous AuNi alloy catalytic material and a preparation method thereof, and belongs to the technical field of electrocatalysis. According to the preparation method, a nanofiber membrane is prepared by adopting an electrostatic spinning method, the homogeneous AuNi alloy nanoparticles are prepared by combining a simple, convenient and efficient stepped heating method and a high-temperature thermal reduction method, and the preparation method is simple and convenient to operate, environment-friendly and efficient. The catalytic material alloy particles prepared through the method reach the nanoscale and are used for preparing carbon monoxide through electrochemical reduction of carbon dioxide, the catalytic activity is high, the CO optimal Faraday efficiency ofthe catalytic material Au1Ni1/CNFs can reach 92%, and the current density reaches 3.9 mAcm<-2>. Meanwhile, the hydrogen evolution reaction can be effectively inhibited, high selectivity and stabilityare achieved, and the prepared catalytic material Au1Ni1/CNFs can still keep stable after continuously working for 12 h.

Description

technical field [0001] The invention relates to a homogeneous AuNi alloy catalytic material and a preparation method thereof, belonging to the technical field of electrocatalysis. Background technique [0002] In recent years, the extensive use of fossil energy has caused a huge amount of carbon dioxide gas to be discharged into the atmosphere, which has caused a series of environmental problems such as global warming. How to improve the efficient utilization and conversion of energy has become a very challenging issue. Among many carbon dioxide conversion and reuse schemes, electrocatalytic reduction of carbon dioxide provides a direction for people to solve energy and environmental problems because of its clean, efficient and sustainable advantages. [0003] Among the many products of electrocatalytic reduction of carbon dioxide, CO has become the most widely studied product because of its simple and efficient reaction path and high economic value. The carbon dioxide mol...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/08B01J37/14B01J37/18C25B11/06C25B1/00D01D5/00D04H1/728
CPCB01J23/892B01J35/0033B01J37/08B01J37/14B01J37/18C25B1/00D01D5/0015D04H1/728C25B11/091
Inventor 朱罕郝继灿蔡剑祝振锋杜明亮
Owner JIANGNAN UNIV
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