用于电催化硝酸盐还原制氨的多孔Fe2TiO5纳米纤维的催化性能OA

Nitrate pollution,which induces eutrophication and threatens drinking water safety,has become a global environmental issue.Conventional remediation technologies,including biological denitrification,ion exchange,and reverse osmosis,are constrained by limited efficiency,high operational costs,and secondary pollution,thereby restricting large-scale application.The low-energy recycling of nitrate pollutants is a significant challenge currently faced in the fields of environment and energy.Meanwhile,ammonia(NH3),a promising energy carrier with high hydrogen density and established infrastructure,is currently produced mainly via the Haber-Bosch process,developed by Fritz Haber and Carl Bosch.This thermochemical route operates under harsh conditions(400～650℃,15～25 MPa)and is energy-intensive and carbon-emitting,motivating the exploration of sustainable alternatives. In recent years,electrocatalytic nitrate reduction technology has garnered significant attention due to its ability to simultaneously achieve nitrate pollutant removal and ammonia synthesis.The core of this technology lies in the development of catalysts with high selectivity and stability.Therefore,the study proposes the construction of a catalyst system with high performance and stability,aiming to achieve efficient ammonia conversion by regulating the microstructure of the catalyst.However,conventional nanostructures exhibit intrinsic limitations:nanoparticles suffer from aggregation,sintering or detachment;one-dimensional nanofibers often lack robust active-site integration;and two-dimensional nanosheets are prone to restacking,leading to blocked active sites and sluggish charge transfer.Rational structural engineering is therefore essential to achieve high activity and durability. Herein,leveraging the structural versatility and multivalent characteristics of spinel-type oxides(AB2 O3),a self-supporting porous Fe2 TiO5 nanofibrous membrane was fabricated via electrospinning followed by thermal treatment with a pore-forming strategy.The resulting fibers possess an average diameter of(405±30)nm and a specific surface area of 120.2 m2/g.Serving directly as a working electrode,the membrane exhibits optimal NO3 RR performance at-1.0 V versus RHE in 0.1 mol/L PBS containing 0.1 mol/L NaNO3,achieving an ammonia yield of 0.158 mmol/(h·cm2)with a Faradaic efficiency of 85.7%.This work provides a viable structural design strategy for self-supporting porous nanofibrous electrocatalysts toward efficient nitrate-to-ammonia conversion.