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Efficient electrore duction of nitrate via enriche d active phases on copper-cobalt oxides
Fang, Ling1; Wang, Sha1,2; Lu, Shun1; Yin, Fengjun1; Dai, Yujie1; Chang, Lin1; Liu, Hong1
2024-04-01
摘要Electrochemical conversion of nitrate (NO3 -) to ammonia (NH3 ) can target two birds with one stone well, in NO3 --containing sewage remediation and sustainable NH3 production. However, single metalbased catalysts are difficult to drive high-efficient NO3 - removal due to the multi-electron transfer steps. Herein, we present a tandem catalyst with simple structure, Cu-Co binary metal oxides (Cu-Co-O), by engineering intermediate phases as catalytic active species for NO3 - conversion. Electrochemical evaluation, X-ray photoelectron spectroscopy, and in situ Raman spectra together suggest that the newly-generated Cu-based phases was prone to NO3 - to NO2 - conversion, then NO2 - was reduced to NH3 on Co-based species. At an applied potential of -1.1 V vs . saturated calomel electrode, the Cu-Co-O catalyst achieved NO3 --N removal of 90% and NH3 faradaic efficiency of 81% for 120 min in 100 mL of 50 mg/L NO3 --N, consuming only 0.69 kWh/mol in a two-electrode system. This study provides a facile and efficient engineering strategy for developing high-performance catalysts for electrocatalytic nitrate conversion. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
关键词Electrocatalytic reduction Copper -cobalt oxides Tandem reactivity Enriched active phases
DOI10.1016/j.cclet.2023.108864
发表期刊CHINESE CHEMICAL LETTERS
ISSN1001-8417
卷号35期号:4页码:6
通讯作者Liu, Hong(liuhong@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001170316200001
语种en