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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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 electrocatalytic carbon dioxide reduction catalyst efficiency, serious hydrogen evolution side reaction, low selectivity and cumbersome preparation process. And greatly improve the utilization efficiency of metal nanoparticles

Method used

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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

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0046] Take by weighing 0.412g of chloroauric acid, 0.291g of nickel nitrate, that is, the gold-nickel molar ratio is 1:1, and adding it to 15g of polyvinyl alcohol / N,N-dimethylformamide solution with a mass fraction of 20%, using Magnetic stirring produces a homogeneous and transparent solution.

[0047] The above solution is spun by electrospinning, the positive voltage of the spinning is controlled to be 15kV, the distance between the positive electrode and the receiver is set to 20cm, and the solution pushing speed is 0.2mL / min, that is, the nanometer containing gold salt and nickel salt is prepared. Fiber membrane.

[0048] Clamp 0.8g of the prepared nanofiber membrane into a graphite sheet, place it in a tube furnace, and carry out a stepwise heating pre-oxidation treatment in an air atmosphere according to the following temperature and holding time: 80°C-4h, 100°C-4h , 120°C-4h, 140°C-4h, 160°C-4h, 180°...

Embodiment 2

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

[0062] Take by weighing 0.412g of chloroauric acid, 0.873g of nickel nitrate, that is, the gold-nickel molar ratio is 1:3, adding it to 15g of polyvinylpyrrolidone / N,N-dimethylformamide solution with a mass fraction of 20%, using Magnetic stirring produces a homogeneous and transparent solution.

[0063] The solution is spun by electrospinning, the positive voltage of the spinning is controlled to be 18kV, the distance between the positive electrode and the receiver is set to 25cm, and the pushing speed of the solution is 0.3mL / min. nanofibrous membrane.

[0064] 0.8g of the prepared nanofiber membrane is sandwiched between graphite sheets, placed in a tube furnace, and subjected to stepwise temperature rise pre-oxidation treatment in an air atmosphere at the following temperatures: 80°C-4h, 100°C-4h, 120°C -4h, 140°C-4h, 160°C-4h, 180°C-4h, so that the fiber membrane can form a stable structure, effectively p...

Embodiment 3

[0069] (1) Preparation of catalytic material Au3 Ni 1 / CNFs:

[0070] Take by weighing 0.247g of chloroauric acid, 0.058g of nickel nitrate, that is, the gold-nickel mol ratio is 3:1, and adding it to 15g of polyacrylonitrile / N,N-dimethylformamide solution with a mass fraction of 20%, using Magnetic stirring produces a homogeneous and transparent solution.

[0071] All the other preparation methods are the same as in Example 1.

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

[0073] The test method is the same as the method 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 Faradaic efficiency of / CNFs is 80%, given by image 3 (b) It can be concluded that the catalytic material Au 3 Ni 1 / CNFs with a current density of 3.7 mA 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
CPCB01J23/892B01J37/08B01J37/14B01J37/18C25B1/00D01D5/0015D04H1/728C25B11/091B01J35/33
Inventor 朱罕郝继灿蔡剑祝振锋杜明亮
Owner JIANGNAN UNIV
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