4.7 Article

Ni3N nanoparticles on porous nitrogen-doped carbon nanorods for nitrate electroreduction

期刊

CHEMICAL ENGINEERING JOURNAL
卷 430, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132666

关键词

Ultrafine Ni3N nanoparticles; Porous nanorod; Nitrogen-doped carbon; Nitrate reduction reaction; Electroreduction

资金

  1. Outstanding Youth Project of Guangdong Natural Science Foundation [2021B1515020051]
  2. Science and Technology Program of Guangzhou [2019050001]
  3. Special Fund Project of Science and Technology Application in Guangdong [2017B020240002]
  4. National 111 project

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Ni3N/N-C nanohybrids synthesized in this work exhibit efficient electroreduction of nitrate, high selectivity and yield rate for ammonium production, as well as excellent long-term stability, making them promising candidates for practical applications in nitrate treatment and ammonium production.
Electrocatalytic nitrate reduction into recyclable ammonium under mild conditions provides an efficient and clean ammonium production strategy and remediation of nitrate-containing wastewater. In this work, we successfully synthesize the Ni3N nanoparticles anchored on nitrogen-doped carbon (Ni3N/N-C) nanohybrids through simple calcination and acid etching procedures using Ni-dimethylglyoxime complex (Ni-DMG) nanorods as raw material. Physical characterizations confirm that as-synthesized Ni3N/N-C nanohybrids have the high specific surface area of 665.7 m2 g-1 and the ultrafine Ni3N nanoparticles (5.3 nm) are dispersed uniformly on the surface of porous nitrogen-doped carbon nanorods. The electrochemical experiments indicate that the combination of nitrogen-doped carbon can greatly improve electroactivity of Ni3N nanoparticles for nitrate reduction reaction. Consequently, Ni3N/N-C nanohybrids possess high selectivity for ammonium production (89.5%) and high yield rate of ammonium (9.185 mmol h-1 mgNi3N- 1) for nitrate electroreduction. Additionally, Ni3N/N-C nanohybrids also show excellent long-term stability due to their structural/chemical stability.

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