ITO@TiO<sub>2</sub> nanoarray: An efficient and robust nitrite reduction reaction electrocatalyst toward NH<sub>3</sub> production under ambient conditions

Li Shaoxiong; Liang Jie; Wei Peipei; Liu Qian; Xie Lisi; Luo Yonglan; Sun Xuping

doi:10.1016/j.esci.2022.04.008

Volume 2 Issue 4

Jul. 2022

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Article Navigation > eScience > 2022 > 2(4): 382-388

Li Shaoxiong, Liang Jie, Wei Peipei, Liu Qian, Xie Lisi, Luo Yonglan, Sun Xuping. ITO@TiO2 nanoarray: An efficient and robust nitrite reduction reaction electrocatalyst toward NH3 production under ambient conditions[J]. eScience, 2022, 2(4): 382-388. doi: 10.1016/j.esci.2022.04.008

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Li Shaoxiong, Liang Jie, Wei Peipei, Liu Qian, Xie Lisi, Luo Yonglan, Sun Xuping. ITO@TiO₂ nanoarray: An efficient and robust nitrite reduction reaction electrocatalyst toward NH₃ production under ambient conditions[J]. eScience, 2022, 2(4): 382-388. doi: 10.1016/j.esci.2022.04.008

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ITO@TiO₂ nanoarray: An efficient and robust nitrite reduction reaction electrocatalyst toward NH₃ production under ambient conditions

doi: 10.1016/j.esci.2022.04.008

a.
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, School of Chemistry and Chemical Engineering, China West Normal University, Nanchong, 637002, Sichuan, China
b.
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China
c.
Institute for Advanced Study, Chengdu University, Chengdu, 610106, Sichuan, China

More Information

Corresponding author: E-mail address: luoylcwnu@hotmail.com (Y. Luo); xpsun@uestc.edu.cn (X. Sun)
Received Date: 2021-12-29
Revised Date: 2022-03-04
Accepted Date: 2022-04-30

Available Online: 2022-05-06

Abstract

Abstract

Ambient electrochemical nitrite (NO₂^-) reduction is viewed as an effective and sustainable approach for simultaneously removing NO₂^- and producing ammonia (NH₃). However, the complex multi-electron transfer steps involved in the NO₂^- reduction reaction (NO₂^-RR) lead to sluggish kinetics and low product selectivity toward NH₃, underscoring the need for NH₃ synthesis electrocatalysts with high activity and durability. Herein, we report amorphous indium–tin oxide sputtered on a TiO₂ nanobelt array on a Ti plate (ITO@TiO₂/TP) as a 3D NH₃-producing catalyst for the NO₂^-. In 0.5 M LiClO₄ with 0.1 M NO₂^-, it shows greatly boosted NO₂^-RR activity toward NH₃ production, with excellent selectivity, achieving a large NH₃ yield of 411.3 μmol h^-1 cm^-2 and a high Faradaic efficiency of 82.6%. It also shows high durability for continuous electrolysis. A Zn-NO₂^- battery with ITO@TiO₂/TP cathode offers an NH₃ yield of 23.1 μmol h^-1 cm^-2 and a peak power density of 1.22 mW cm^-2.
- ITO,
- Electrocatalysis,
- Magnetron sputtering,
- Nitrite reduction reaction,
- NH₃ electrosynthesis

● A battery was assembled by using ITO@TiO₂/TP as the cathode.
● It shows high catalytic activity and stability for NH₃ synthesis.
● An ITO@TiO₂ nanoarray was used for nitrite electroreduction.

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