A TiO2- nanobelt array with oxygen vacancies: an efficient electrocatalyst toward nitrite conversion to ammonia
Donglin Zhao1, Jie Liang2, Jun Li2
1College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, Sichuan, China. liquan6688@163.com.
Chemical Communications (Cambridge, England)
|February 28, 2022
Summary
This study demonstrates a novel titanium dioxide (TiO2) nanobelt array catalyst for efficient electrocatalytic nitrite reduction to ammonia. The catalyst exhibits high efficiency and durability, offering a sustainable solution for environmental remediation and ammonia synthesis.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Science
Background:
- Nitrite contamination poses environmental risks.
- Sustainable ammonia synthesis is crucial.
- Electrocatalysis offers a potential solution for nitrite reduction.
Purpose of the Study:
- To develop an efficient electrocatalyst for nitrite reduction to ammonia.
- To investigate the role of oxygen vacancies in the catalytic process.
- To assess the catalyst's efficiency, yield, and durability.
Main Methods:
- Fabrication of a TiO2 nanobelt array on a titanium plate.
- Electrocatalytic reduction of nitrite in an alkaline solution.
- Performance evaluation including faradaic efficiency and yield.
- Durability testing over 12 hours.
- Theoretical calculations to understand the mechanism.
Main Results:
- Achieved 92.7% faradaic efficiency for nitrite to ammonia conversion.
- Obtained a high yield of 7898 μg h⁻¹ cm⁻².
- Demonstrated catalyst durability with sustained activity for 12 hours.
- Theoretical calculations confirmed the importance of oxygen vacancies.
Conclusions:
- The TiO2 nanobelt array with oxygen vacancies is a highly effective catalyst for electrocatalytic nitrite reduction.
- This technology shows promise for both environmental nitrite control and sustainable ammonia production.
- Oxygen vacancies play a critical role in enhancing the electrocatalytic performance.
