Abstract
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.
基金项目
国家自然科学基金(52131003)
国家自然科学基金(42007180)
Special Research Assistant Program of Chinese Academy of Science()
重庆市自然科学基金(cstc2020jcyj-msxmX0775)
Scientific Research Instrument Development Project of Chinese Academy of Sciences(YJKYYQ20200044)
Outstanding Scientist of Chongqing Talent Program(CQYC20210101288)
NETL
NSTL
万方数据