Performance study of ammonia synthesis via electrocatalytic nitrate reduction catalyzed by copper-aluminum layered double hydroxide

YUWEN Chen; ZHANG Taijing; JI Huanhuan

doi:10.12434/j.issn.2097-2547.20250029

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Performance study of ammonia synthesis via electrocatalytic nitrate reduction catalyzed by copper-aluminum layered double hydroxide

更新时间：2025-11-25

- Performance study of ammonia synthesis via electrocatalytic nitrate reduction catalyzed by copper-aluminum layered double hydroxide
- Vol. 50, Issue 11, Pages: 138-149(2025)
- 作者机构：
  
  河北农业大学城乡建设学院，河北保定 071000
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250029
  CLC： TQ113.2;TQ426
- Received：18 January 2025，
  
  Revised：2025-03-12，
  
  Published：25 November 2025
- 稿件说明：
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宇文晨,张泰境,吉欢欢.铜铝水滑石电催化还原硝酸盐合成氨性能研究[J].低碳化学与化工,2025,50(11):138-149.

YUWEN Chen,ZHANG Taijing,JI Huanhuan.Performance study of ammonia synthesis via electrocatalytic nitrate reduction catalyzed by copper-aluminum layered double hydroxide[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(11):138-149.
宇文晨,张泰境,吉欢欢.铜铝水滑石电催化还原硝酸盐合成氨性能研究[J].低碳化学与化工,2025,50(11):138-149. DOI： 10.12434/j.issn.2097-2547.20250029.

YUWEN Chen,ZHANG Taijing,JI Huanhuan.Performance study of ammonia synthesis via electrocatalytic nitrate reduction catalyzed by copper-aluminum layered double hydroxide[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(11):138-149. DOI： 10.12434/j.issn.2097-2547.20250029.

摘要

与传统的合成氨工艺（Haber-Bosch法）相比，电催化还原硝酸盐合成氨技术具有可再生能源驱动、反应条件温和及无二次污染等优势。然而，该反应仍面临催化剂催化活性不足、产物选择性较低以及稳定性较差等挑战。采用水热法合成了不同铜铝比例（

(Cu)/

(Al)

= x

= 1.5、2或3）的铜铝水滑石（Cu

Al-LDH），并对其进行了表征分析与电化学性能测试，系统探讨了铜铝比例、电解液中初始NO

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3.89466691

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1.10066664

-N质量浓度、施加电位及光照条件对电催化还原硝酸盐合成氨的影响。结果表明，在电位为-0.6 V

. RHE及初始NO

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3.89466691

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1.10066664

-N质量浓度为500 mg/L条件下，Cu

Al-LDH电极的法拉第效率达到98.2%，氨产率达到822.3 μg/(h·cm

)。增加光照后，在相同条件下，Cu

1.5

Al-LDH电极表现出更优的催化性能，理论法拉第效率达到150.5%，氨产率达到1149.1 μg/(h·cm

)。此外，Cu

Al-LDH和Cu

1.5

Al-LDH电极分别在电催化和光辅助电催化条件下表现出优异的稳定性，持续反应10 h后仍能维持较高的法拉第效率。铜铝水滑石在电催化还原硝酸盐合成氨反应中表现出优异性能，具有应用于绿色合成氨的潜力。

Abstract

Compared with the traditional ammonia synthesis process (Haber Bosch method)

electrocatalytic nitrate reduction to ammonia offers advantages such as renewable energy input

mild reaction conditions and no secondary pollution. However

this reaction still faces challenges including insufficient catalytic activity

low product selectivity and poor stability. Copper-aluminum layered double hydroxides (Cu

Al-LDH) with different ratios of Cu to Al (

(Cu)/

(Al)

= x =

1.5

2 or 3) were synthesized by hydrothermal method. Their structures were characterized

and their electrochemical performances were evaluated. The effects of Cu/Al ratio

initial NO

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3.64066648

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=94285035&type=

1.10066664

-N mass concentration in the electrolyte

applied potential and illumination on the efficiency of electrocatalytic nitrate reduction to ammonia were systematically investigated. The results show that the Cu

Al-LDH electrode achieves a Faradaic efficiency o

f 98.2% and an ammonia yield of 822.3 μg/(h·cm

) at -0.6 V

. RHE with an initial NO

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3.64066648

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1.10066664

-N mass concentration of 500 mg/L. Upon light illumination

the Cu

1.5

Al-LDH electrode exhibits enhanced catalytic performance under the same conditions

achieving a theoretical Faradaic efficiency of 150.5% and an ammonia yield of 1149.1 μg/(h·cm

). Furthermore

both Cu

Al-LDH and Cu

1.5

Al-LDH electrodes display excellent stability under electrocatalytic and photo-assisted electrocatalytic conditions

respectively

maintaining high Faradaic efficiency after continuous operation for ten hours. These results indicate that copper-aluminum layered double hydroxides show promising performance for the electrocatalytic reduction of nitrate to ammonia and hold great potential for green ammonia synthesis.

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Keywords

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Institute of Engineering Thermophysics,Chinese Academy of Sciences

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