CuO nanorods for high-efficiency nitrate electroreduction to ammonia†

IF 2.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY New Journal of Chemistry Pub Date : 2025-03-24 DOI:10.1039/D5NJ00500K

Ling-Qi Li, Xiao-Hui Wang, Ze-Nong Zhang, Si-Mian Liu, Xiao Wang and Shu-Ni Li

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Abstract

Electrocatalytic nitrate reduction (NO₃⁻RR) provides an environmentally friendly alternative to the traditional Haber–Bosch technology for ammonia (NH₃) production. Herein, cupric oxide (CuO) nanorods (NRs) were synthesized by a simple one-pot method and applied as NO₃⁻RR electrocatalysts. Due to the nanorod-like structure and large specific surface area, the CuO NR electrocatalyst exhibited excellent NO₃⁻RR performance. The electrocatalyst experienced in situ reconstruction and its phase partly changed from CuO to Cu/Cu₂O in the process of the NO₃⁻RR. The formed Cu/Cu₂O/CuO mixed valence state promoted its catalytic activity for the NO₃⁻RR. At −0.7 V potential, the faradaic efficiency and NH₃ yield could reach 94% and 28.76 mg h⁻¹ mg_cat⁻¹, respectively, along with excellent durability for 10 h.

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高效硝酸电还原制氨的CuO纳米棒

电催化硝酸还原（NO3 - RR）为传统的Haber-Bosch氨（NH3）生产技术提供了一种环保的替代方案。本文采用简单的一锅法合成了氧化铜纳米棒（CuO），并将其用作NO3−RR电催化剂。由于纳米棒状结构和较大的比表面积，CuO NR电催化剂表现出优异的NO3−RR性能。在NO3−RR过程中，电催化剂经历了原位重构，其物相部分由CuO转变为Cu/Cu2O。Cu/Cu2O/CuO混合价态的形成促进了其对NO3−RR的催化活性。在−0.7 V电位下，faradaic效率和NH3产率分别达到94%和28.76 mg h−1 mgcat−1，并具有良好的10 h耐久性。

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