期刊
CHEMICAL ENGINEERING JOURNAL
卷 446, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137341
关键词
Oxide-derived Cu; Structural transition; Stacking faults; Electrocatalytic nitrate reduction
资金
- National Natural Science Foundation of China [52131003, 42007180, 52100065]
- Special Research Assistant Program of Chinese Academy of Science, Natural Science Foundation of Chongqing [cstc2020jcyj-msxmX0775]
The study found that during nitrate reduction, Cu oxide can be transformed into oxide-derived Cu, which exhibits efficient NO3RR performance. The generation of oxide-derived Cu has a positive effect on nitrate adsorption and the activity of metallic Cu.
Electrochemical reduction of nitrate is a promising approach to the production of value-added ammonia, which is meaningful in wastewater remediation and energy saving. However, the structural changes of metal oxide electrocatalysts have not fully understood under the electrocatalytic nitrate reduction reaction (NO3RR). Here, we find that the pristine Cu oxides can be transformed into Cu (oxide-derived Cu) with a high density of stacking faults during NO3RR process. The oxide-derived Cu directly grown on Cu foam produces great nitrate-N removal, ammonia-N selectivity, and ammonia Faradaic efficiency up to 93, 94, and 80%, respectively. Physical characterizations and theoretical investigations indicate that the oxide-derived Cu with in situ generated stacking faults causes tensile strain, which is favorable for nitrate adsorption and makes the metallic Cu more active. This work offers a new strategy of altering the electrocatalyst properties by in situ generating stacking faults from its oxides during nitrate reduction.
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