VALORIZATION OF LIGNIN in 0D and 1D ADVANCED SYSTEMS:PARTICLES for EMULSIFICATION and FIBERS for ENERGY STORAGE
We demonstrate the valorization of technical lignins into advanced materials.First,0-D systems,namely lignin micro and nanoparticles were developed for the stabilization of oil-water interfaces.Here we introduce spherical particles with sizes ranging from 30 nm to few microns that were synthesized for the first time in an aerosol flow reactor with in-situ fractionation.We extended our work to 1-D systems: Highly mesoporous carbon fibers were obtained from lignin aqueous solutions and used as webs for conductive electrodes with supercapacitance.Polyvinyl alcohol(PVA)was used as sacrificial polymer to facilitate electrospinning of lignin and,most importantly,to produce microphase separation that induced high surface area and mesoporosity.Nitrogen gas adsorption revealed extremely high surface area(> 2000 m2/g)and pore volume(0.7 cm3/g).The mesopores were dominant over micropores and displayed a wider size distribution.The carbon fiber networks were used directly as electrodes with electrochemical double layer capacitance as elucidated by cyclic voltammetry and galvanostatic charge/discharge techniques.The excellent electrochemical capacitance was demonstrated,including a high rate capability,and long-term cycling stability.A specific capacitance as high as 205 F/g in 0.5 M Na2SO4 electrolyte was delivered,one of the highest recorded for electrodes obtained from biopolymer precursors.
Mariko Ago Siqi Huan Maryam Borghei Tero K(a)m(a)r(a)inen Johannes S.Haataja Orlando J.Rojas
Departments of Forest Products and Applied Physics,Aalto University,Espoo FI-00076 Aalto,Finland
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-3
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）