Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for generating ammonia by nitrogen

A nitrogen and ammonia technology, applied in the field of photoelectrochemistry, can solve problems such as hindering the development of photoelectrochemical nitrogen reduction synthesis of ammonia, low conversion efficiency, low ammonia yield, etc., and achieves improved photoelectrochemical nitrogen reduction synthesis ammonia performance, simple device, and low cost. Effect

Active Publication Date: 2021-01-15
HUNAN UNIV
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing photocathode shows low ammonia yield and low conversion efficiency at room temperature and pressure, which seriously hinders the development of photoelectrochemical nitrogen reduction synthesis of ammonia.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for generating ammonia by nitrogen
  • Device and method for generating ammonia by nitrogen
  • Device and method for generating ammonia by nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Reaction: The 3H-type reaction cell is used as a reaction device, including a working electrode compartment, two counter electrode compartments and a proton-conducting cation exchange membrane. The photocathode of the first working electrode is p-type silicon (Au / SiO) supported by gold nanoparticles and protected by a silicon oxide layer. 2 / Si photocathode), the second working electrode is acid-etched, oxidized and methane plasma treated stainless steel base mesh material. Two working electrodes are placed in the working electrode compartment in an orderly manner, the second working electrode is close to the nitrogen gas inlet, and the first working electrode is close to the gas outlet. Platinum mesh and Ag / AgCl electrodes serve as counter and reference electrodes, respectively, and each counter electrode compartment contains a counter electrode and a reference electrode. The working electrode compartment is separated from the counter electrode compartment by a proton-...

Embodiment 2

[0089] Reaction: The reaction device and reaction conditions are consistent with Example 1, except that the stainless steel-based electrode is replaced with foam Cu as the second working electrode, Au / SiO 2 The / Si photocathode was still used as the first working electrode, and its applied voltage was fixed at −0.2 V (vs RHE), while the relationship between the applied voltage of the foamed Cu electrode and the photoelectrochemical nitrogen reduction behavior was investigated.

[0090] Au / SiO 2 The composition and structure of the / Si photocathode are consistent with Example 1, while the foamed Cu electrode is pure metallic Cu.

[0091] The result of the reaction is as image 3 As shown, the first working electrode Au / SiO 2 The working electrode system composed of Si photocathode and second working electrode foam Cu electrode has an applied voltage of -0.2V (vs RHE) on the first working electrode, and -0.7V (vs RHE) on the foam Cu electrode. , the ammonia production rate is...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a device and a method for generating ammonia by nitrogen. The device comprises a working electrode compartment and a counter electrode compartment, the working electrode compartment is communicated with the counter electrode compartment, a proton conductive cation exchange membrane used for separation is arranged between the working electrode compartment and the counter electrode compartment, and the working electrode compartment is provided with a first working electrode and a second working electrode. The first working electrode and the second working electrode are arranged oppositely at an interval, the working electrode compartment is provided with a gas inlet and a gas outlet, reaction gas entering from the gas inlet can sequentially pass through the second working electrode and the first working electrode and then is discharged from the gas outlet, and the counter electrode compartment is provided with a counter electrode and a reference electrode. Compared with a single working electrode, the porous material is added to serve as the second working electrode, and the better photoelectrochemical nitrogen reduction ammonia synthesis performance is shown.The auxiliary enhancement method can also be expanded to other photoelectrochemical reactions, especially multi-electron and multi-step reactions with delayed reaction rates.

Description

technical field [0001] The invention relates to the field of photoelectrochemical technology, in particular to a device and method for generating ammonia from nitrogen. Background technique [0002] Nitrogen reduction to ammonia is one of the most important chemical reaction processes in nature, making important contributions to the balance of human beings and the earth's ecosystem. As the most basic chemical substance, ammonia is the basic precursor of various industries and is used in the production of chemicals such as fertilizers, synthetic fibers, dyes, explosives, and resins. At the same time, due to the high hydrogen content (17.8%), the high volumetric energy density (13.6GJ / m 3 ), carbon-free, and easy to transport (boiling point is -33°C), ammonia can be regarded as a potential candidate for future hydrogen energy carriers. According to statistics, the global annual ammonia production is 150-200 million tons, and the main method of industrial ammonia synthesis is...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C25B1/27C25B9/19C25B9/50C25B11/031C25B11/054
CPCY02P20/133
Inventor 郑建云蒋三平王双印陈如
Owner HUNAN UNIV