Boron-doped silver nano spongy catalyst for electrochemical ammonia synthesis and preparation method thereof

A catalyst and sponge-like technology, which is applied in the field of boron-doped silver nano-sponge electrochemical ammonia synthesis catalyst and its preparation, can solve the problems of low NH3 Faraday efficiency and cannot be applied in industrial fields, and achieve high yield, mild preparation method, The effect of simple preparation method

Inactive Publication Date: 2019-12-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although extensive theoretical and experimental studies have been conducted on the development of noble metal-based NRR electrocatalysts, their low NH 3 Yield and Faradaic efficiency are far from being applicable in the industrial field

Method used

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  • Boron-doped silver nano spongy catalyst for electrochemical ammonia synthesis and preparation method thereof
  • Boron-doped silver nano spongy catalyst for electrochemical ammonia synthesis and preparation method thereof
  • Boron-doped silver nano spongy catalyst for electrochemical ammonia synthesis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a boron-doped silver nano-sponge electrochemical catalyst for ammonia synthesis, said method comprising the steps of:

[0036] (1) prepare the DMF solution that concentration is the silver nitrate of 0.1M and sodium borohydride respectively;

[0037] (2) get 1.0mL concentration and be the DMF solution of the silver nitrate of 0.1M, join then 5.0mL concentration and be the DMF solution of the sodium borohydride of 0.1M, stir reaction 1.5 hours under ice-water bath condition, wash, centrifuge, dry, The boron-doped silver nano-sponge catalyst is obtained.

[0038] The SEM figure of the obtained boron-doped silver nano-sponge electrochemical ammonia synthesis catalyst can be found in figure 1 . The TEM picture of obtained boron-doped silver nano-sponge electrochemical ammonia synthesis catalyst can be found in figure 2 . The XRD pattern of obtained boron-doped silver nano-sponge electrochemical ammonia synthesis catalyst can be found in image ...

Embodiment 2

[0041] A preparation method of a silver nano-sponge electrochemical ammonia synthesis catalyst, said method comprising the steps of:

[0042] (1) prepare the aqueous solution of silver nitrate and sodium borohydride that concentration is 0.1M respectively;

[0043] (2) Get 1.0mL concentration and be the aqueous solution of silver nitrate of 0.1M, then join into 5.0mL concentration and be the aqueous solution of 0.1M sodium borohydride, stir reaction 2 hours under ice-water bath condition, wash, centrifuge, dry, obtain obtained Described silver nano-sponge catalyst.

[0044] Obtain the SEM figure of silver nano-sponge catalyst see Figure 7 ; Silver nano-sponge catalyst catalyzes the performance diagram of nitrogen reduction to prepare ammonia, see Figure 8 .

[0045] It can be seen from the SEM image that the silver nano-sponge electrochemical ammonia synthesis catalyst has been formed. The performance diagram of ammonia preparation by nitrogen reduction shows that the am...

Embodiment 3

[0047] A method for preparing boron-doped silver nanoparticles, the method comprising the steps of:

[0048] (1) prepare the DMF solution that concentration is the silver nitrate of 0.5M and sodium borohydride respectively;

[0049] (2) get 1.0mL concentration and be the DMF solution of the silver nitrate of 0.5M, then add to 5.0mL concentration and be the DMF solution of the sodium borohydride of 0.5M, stir reaction 2.5 hours under ice-water bath condition, wash, centrifuge, dry, The boron-doped silver nanoparticle catalyst is obtained.

[0050] Obtain the SEM image of boron-doped silver nanoparticles see Figure 9 .

[0051] It can be seen from the SEM images that boron-doped silver nanoparticles have been formed. This is mainly due to the change in the morphology of the boron-doped silver due to changing the concentration of the precursor.

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Abstract

A boron-doped silver nano spongy catalyst for electrochemical ammonia synthesis is prepared by the following method: preparing an N,N-dimethylformamide (DMF) solution and aqueous solution of silver nitrate with a concentration of 0.01-1.0 M, and preparing a DMF solution and aqueous solution of sodium borohydride with a concentration of 0.01-1.0 M; adding 1.0 mL of the DMF solution and aqueous solution of silver nitrate with the concentration of 0.01-1.0 M into 5.0 mL of the DMF solution and aqueous solution of sodium borohydride with the concentration of 0.01-1.0 M, separately carrying out stirring for reacting for 1.5-2.5 hours under an ice-water bath condition and under a normal temperature condition, and carrying out washing, centrifuging and drying to obtain the boron-doped silver nanospongy catalyst. The invention also provides a preparation method of the boron-doped silver nano spongy for electrochemical ammonia synthesis. The preparation process is simple, the reaction time isshort, and the prepared material has excellent electrochemical nitrogen reduction performance at low temperature and normal pressure.

Description

technical field [0001] The invention relates to a boron-doped silver nano-sponge electrochemical catalyst for ammonia synthesis and a preparation method thereof. The catalyst can be used for the research of electrocatalytic nitrogen reduction reaction. Background technique [0002] Ammonia (NH 3 ) is an important synthetic chemical substance, which has a wide range of applications in the fields of chemical fertilizers, textiles, and medicine. Moreover, NH 3 It is considered as a promising carbon-free energy carrier with high hydrogen content and convenient storage and transportation. Currently, the traditional Haber-Bosch process in NH 3 Occupies a large proportion of the production of which N 2 and H 2 The reaction is carried out under harsh reaction conditions such as 400-600° C. and 150-350 atm on an iron-based or ruthenium-based catalyst. due to N 2 The extreme inertness of , more than 1% of the annual global energy supply is used to produce NH 3 . At the same t...

Claims

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Application Information

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IPC IPC(8): B01J23/50C25B1/00C25B11/06
CPCB01J23/50C25B1/00C25B11/04B01J35/33
Inventor 王鸿静李英豪王自强许友王亮
Owner ZHEJIANG UNIV OF TECH
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