| Increasingly serious problems such as environmental pollution,energy shortage and climate change caused by the massive burning of fossil energy have greatly hindered the sustainable development of human society.Therefore,there is urgently need to develop clean and sustainable energy to meet large energy needs.Alkaline water electrolysis and nitrogen fixed have been proposed for achieving more efficient energy conversion or storage systems.Noble metal based materials were widely used for their excellent catalytic activity.However,their scarcity and high cost seriously limited their scalable production.As a result,it is of great significance to develop electrocatalysts with the characteristics of low-cost,abundant,efficient and stable.In this paper,the following effective electrocatalysts were designed with structure modification,material composition and electronic control for improving the catalytic activity of the catalysts.1.Iron?Fe?doped Ni nanoparticles encapsulating in nitrogen-doped carbon microspheres ?Fe-Ni@NC?was prepared by direct pyrolyzing Fe doped Ni-based metal-organic framework?MOFs?for effectively boosting oxygen evolution reaction?OER?.The Fe-doping level has an influence on the catalytic properties.The optimized catalyst of Fe ?5%?-Ni@NC represents remarkable activity and durability with an overpotential of 257 mV at a current density of 10 mA cm-2 for OER in 1.0 M KOH.This research provides us outstanding catalyst for electrochemical water splitting applications.2.Reduced graphene oxide was modified by tannic acid?TA-rGO?for tunning its electronic structure,which is a mild and effective strategy to boost its nitrogen reduction reaction?NRR?activity.Such electrocatalyst is stable with an NH3 formation rate of 17.02?g h-1 mg-1cat.in 0.5 M LiClO4,and its Faradaic efficiency can reach 4.83%at an optimized potential.The work would provide an impressive new option to boost the electrocatalytic N2-fixing performances of carbon materials by organic molecules modification. |
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