摘要
Although considerable effort has been devoted to purifying nitrogen oxides(NOx),it is still challenging to effectively reduce NOxat room temperature and ambient pressure without catalysts.In this study,as a proof-of-concept,we have for the first time demonstrated the room-temperature reduction of nitrogen dioxide(NO2)using a rechargeable lithium-nitrogen dioxide(Li-NO2)battery.The battery shows a capacity of 884 m Ah g-1 at 50 m A g-1(an actual energy density of 666 Wh kg-1)and a promising electrochemical Faraday efficiency(FE)of 67%.The unique properties of Li-NO2 rechargeable batteries not only provide a way to reduce and recycle NO2 but also highlight the potential of oxidative air pollutants as energy sources for next-generation electrochemical energy storage(EES)systems.
氮氧化物(NOx)的排放给生态环境和人类社会带来了严重危害.传统净化措施成本高,同时难以实现污染物的循环利用,如何实现经济高效的NOx处理已经成为极具挑战的课题.本研究成功构建了一种新型锂-二氧化氮(Li-NO2)电池,阐明了其充放电机制,实现了NO2在室温下的高效还原.该体系在50 mA g–1的电流密度下实际能量密度高达666 Wh kg–1,NO2还原的法拉第电化学效率达到67%,能够在实现NO2还原的同时高效输出电能.这种新型Li-NO2电池的构建不仅为NO2的治理和再利用提供了新的研究思路,同时为其他污染物气体的高效利用提出了普适性策略.
基金
financial support from the National Science Fund for Distinguished Young Scholars, China (51525204)
the National Natural Science Foundation of China (51602220 and U1710109)
