In:
Small, Wiley, Vol. 19, No. 30 ( 2023-07)
Abstract:
Electroreduction of nitrate to ammonia reaction (NO 3 − RR) is considered as a promising carbon‐free energy technique, which can eliminate nitrate from waste‐water also produce value‐added ammonia. However, it remains a challenge for achieving satisfied ammonia selectivity and Faraday efficiency (FE) due to the complex multiple‐electron reduction process. Herein, a novel Tandem electrocatalyst that Ru dispersed on the porous graphitized C 3 N 4 (g‐C 3 N 4 ) encapsulated with self‐supported Cu nanowires (denoted as Ru@C 3 N 4 /Cu) for NO 3 − RR is presented. As expected, a high ammonia yield of 0.249 mmol h −1 cm −2 at −0.9 V and high FE NH3 of 91.3% at −0.8 V versus RHE can be obtained, while achieving excellent nitrate conversion (96.1%) and ammonia selectivity (91.4%) in neutral solution. In addition, density functional theory (DFT) calculations further demonstrate that the superior NO 3 − RR performance is mainly resulted from the synergistic effect between the Ru and Cu dual‐active sites, which can significantly enhance the adsorption of NO 3 − and facilitate hydrogenation, as well as suppress the hydrogen evolution reaction, thus lead to highly improved NO 3 − RR performances. This novel design strategy would pave a feasible avenue for the development of advanced NO 3 − RR electrocatalysts.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202302266
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2168935-0
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