The in situ decoration of Ti3C2 quantum dots on Cu nanowires for highly efficient electrocatalytic reduction of nitric oxide to ammonia

In order to solve the environmental problems caused by the ever-growing NO emission from the combustion of fossil fuels, an electrocatalytic reduction technique has been developed to convert NO into NH3 under ambient conditions, which is also regarded as a promising alternative for the traditional H...

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Veröffentlicht in:Inorganic chemistry frontiers 2023-10, Vol.10 (20), p.5927-5936
Hauptverfasser: Li, Baojing, Shen, Dongcai, Xiao, Zhengting, Li, Quan, Yao, Shuo, Wang, Wentai, Liu, Licheng
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Sprache:eng
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Zusammenfassung:In order to solve the environmental problems caused by the ever-growing NO emission from the combustion of fossil fuels, an electrocatalytic reduction technique has been developed to convert NO into NH3 under ambient conditions, which is also regarded as a promising alternative for the traditional Haber–Bosch process. Catalysts with excellent activity and selectivity are necessary for the efficient NO reduction to NH3. Herein, we decorated Ti3C2 quantum dots (Ti3C2 QDs) on Cu nanowires (Cu NWs) as an efficient and stable electrocatalyst (Ti3C2 QDs/Cu NWs) with greatly improved NO conversion performances. The Ti3C2 QDs/Cu NWs affords a significantly enhanced NH3 yield of 5346.3 μg h−1 mg−1 and high faradaic efficiency (FE) of 95.5% compared to the Cu NWs (3313.11 μg h−1 mg−1, 89.51%) at −0.4 V vs. RHE in 0.1 M K2SO4 electrolyte. We further assembled a Zn–NO battery using Ti3C2 QDs/Cu NWs as the cathode and a Zn plate as the anode, which shows a power density of 3.03 mW cm−2 and an NH3 yield of 925.2 μg h−1 mg−1. The improved NORR activity can be attributed to the role of the Ti3C2 QDs converter. The density functional theory calculation results reveal the catalytic mechanism, indicating the reaction pathway of *NO → *HNO → *N → *NH → *NH2 → *NH3 and the potential determination step of *N → *NH.
ISSN:2052-1545
2052-1553
DOI:10.1039/d3qi01337e