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Urea Cycle

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Related Experiment Video

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Atomic Defects Engineering Boosts Urea Synthesis toward Carbon Dioxide and Nitrate Coelectroreduction.

Zifan Xu¹, Zhengwu Yang¹, Huan Lu¹

¹Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

|September 9, 2024

Summary

Creating oxygen vacancies on indium hydroxide nanobelts significantly boosts urea electrosynthesis efficiency. This defect engineering enhances catalytic performance for producing urea, achieving record-high activity.

Keywords:

In(OH)3 nanobelt atomic defect engineering carbon dioxide and nitrate utilization oxygen vacancy urea electrosynthesis

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Ammonia Synthesis at Low Pressure

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Published on: August 23, 2017

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Atomic defect engineering offers a pathway to tune material properties for enhanced catalytic performance.
Surface defects, specifically oxygen vacancies, can alter the chemical behavior of reaction intermediates.

Purpose of the Study:

To investigate the impact of oxygen vacancies on the surface of In(OH)3 nanobelts for urea electrosynthesis.
To enhance the efficiency and activity of urea electrosynthesis through defect engineering.

Main Methods:

Fabrication of In(OH)3 nanobelts with controlled oxygen vacancies.
Electrochemical characterization including Faradaic efficiency and partial current density measurements.
Density Functional Theory (DFT) calculations to understand reaction mechanisms.
In-situ spectroscopy to validate the role of oxygen vacancies.

Main Results:

Oxygen vacancies on In(OH)3 nanobelts led to a significant increase in urea Faradaic efficiency (80.1%) compared to pristine materials (20.7%).
The modified nanobelts demonstrated a record-high partial current density for urea electrosynthesis (-18.8 mA cm-2 at -0.8 V vs RHE).
DFT calculations indicated that unsaturated In sites adjacent to oxygen defects optimize intermediate adsorption and facilitate key reaction steps.
In-situ spectroscopy confirmed the promotional effect of oxygen vacancies on urea electrosynthesis.

Conclusions:

Oxygen vacancy engineering on In(OH)3 nanobelts is an effective strategy to enhance urea electrosynthesis.
The optimized electronic structure and adsorption properties due to oxygen defects are crucial for high catalytic activity.
This work provides a promising approach for developing efficient electrocatalysts for urea synthesis.