Green Energy & Environment ( IF 10.7 ) Pub Date : 2022-03-11 , DOI: 10.1016/j.gee.2022.03.003
Hui Liu 1 , Jingsha Li 2 , Feng Du 2 , Luyun Yang 1 , Shunyuan Huang 2 , Jingfeng Gao 2 , Changming Li 1, 2 , Chunxian Guo 2
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Electrochemical nitrate reduction to ammonia (NRA) can realize the green synthesis of ammonia (NH3) at ambient conditions, and also remove nitrate contamination in water. However, the current catalysts for NRA still face relatively low NH3 yield rate and poor stability. We present here a core–shell heterostructure comprising cobalt oxide anchored on copper oxide nanowire arrays (CuO NWAs@Co3O4) for efficient NRA. The CuO NWAs@Co3O4 demonstrates significantly enhanced NRA performance in alkaline media in comparison with plain CuO NWAs and Co3O4 flocs. Especially, at −0.23 V vs. RHE, NH3 yield rate of the CuO NWAs@Co3O4 reaches 1.915 mmol h−1 cm−2, much higher than those of CuO NWAs (1.472 mmol h−1 cm−2), Co3O4 flocs (1.222 mmol h−1 cm−2) and recent reported Cu-based catalysts. It is proposed that the synergetic effects of the heterostructure combing atom hydrogen adsorption and nitrate reduction lead to the enhanced NRA performance.
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核壳氧化铜-氧化钴异质结构纳米线阵列用于高产率还原硝酸盐生成氨
电化学硝酸盐还原氨(NRA)可以实现常温条件下绿色合成氨(NH 3),并且可以去除水中的硝酸盐污染。然而,目前的NRA催化剂仍然存在NH 3产率较低、稳定性较差的问题。我们在这里提出了一种核壳异质结构,包含锚定在氧化铜纳米线阵列上的氧化钴(CuO NWAs@Co 3 O 4),以实现高效的 NRA。与普通CuO NWAs 和Co 3 O 4絮凝体相比, CuO NWAs@Co 3 O 4在碱性介质中表现出显着增强的NRA性能。特别是,在−0.23 V vs. RHE、NH 3时CuO NWAs@Co 3 O 4的产率达到1.915 mmol h -1 cm -2,远高于CuO NWAs(1.472 mmol h -1 cm -2)、Co 3 O 4絮体(1.222 mmol h -1 cm -2)和最近报道的铜基催化剂。提出结合原子氢吸附和硝酸盐还原的异质结构的协同效应导致NRA性能增强。