首页|Efficient electroreduction of nitrate via enriched active phases on copper-cobalt oxides

Efficient electroreduction of nitrate via enriched active phases on copper-cobalt oxides

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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 metal-based 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 en-gineering 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 50mg/L NO3--N,consuming only 0.69 kWh/mol in a two-electrode system.This study provides a facile and efficient engi-neering strategy for developing high-performance catalysts for electrocatalytic nitrate conversion.

NO3--containing sewage remediationElectrocatalytic reductionCopper-cobalt oxidesTandem reactivityEnriched active phases

Ling Fang、Sha Wang、Shun Lu、Fengjun Yin、Yujie Dai、Lin Chang、Hong Liu

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Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China

University of Chinese Academy of Sciences,Beijing 100049,China

国家自然科学基金国家自然科学基金Special Research Assistant Program of Chinese Academy of Science重庆市自然科学基金Scientific Research Instrument Development Project of Chinese Academy of SciencesOutstanding Scientist of Chongqing Talent Program

5213100342007180cstc2020jcyj-msxmX0775YJKYYQ20200044CQYC20210101288

2024

10.1016/j.cclet.2023.108864

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(4)
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