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GETACHEW ALEMU,MINGKUI WANG,BINGYAN ZHANG,JUNPENG LI,XIAOBAO XU,JIN CUI,YAN SHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
The power conversion e±ciency of p-type dye-sensitized solar cells (DSSC) is determined by thekinetics of hole injection and dye-regeneration reaction at the dye/electrolyte interface. In thiswork, the photochemical regeneration kinetics of dye adsorbed on CuCrO 2 mesoporous ¯lm wasinvestigated by using scanning electrochemical microscopy with feedback mode. Organic P1 andC343 sensitizers in combination with iodide-based and thiolate-based electrolytes were selected tounderstand the e®ect of sensitizers and redox shuttles on dye-regeneration process. A fast re-generation kinetic rate constant was con¯rmed in thiolate-based sample compared with iodide-based electrolyte, indicating that the organic redox shuttle was an e±cient mediator to optimizethe performance of p-type DSSC.
Weili Shao,Wanli Yue,Gaihuan Ren,Chen Cui,Junpeng Xiong,Ling Wang,Tong Lu,Wanjun Bu,Fan Liu,Jianxin He 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
Electrospun nanofibers are widely used in air-filtration materials because of their fine fiber diameter, small poresize, and high porosity. However, nanofiber membranes exhibit a dense structure, such that they present a large resistance toany air flow. In this study, we set out to design and develop composite nanofiber materials with fluffy structures, as well asblended structures of coarse and fine fibers, through electrospinning technology. These materials could be used in airfiltration applications, given that they offer high efficiency and low resistance. The results show that, compared with purePAN nanofibers, the diameter of PAN nanofibers doped with CNT decreased from 192.36 to 124.37 nm; when the spinningratio of PS coarse fiber (1053 nm) and PAN/CNT fine fiber is 3:1, the resulting nanofiber membrane materials has an obviousthree-dimensional structure, with a specific surface area of 103.16 m2/g, a pore size of 2.25 μm, and a quality factor of0.0947 Pa-1. Under test conditions featuring an air flow of 32 L/min, and 0.3 μm NaCl aerosol particles, the filtrationefficiency was 99.37 % and the resistance was 35 Pa. Furthermore, the dust-holding capacity of the nanofiber air-filter paperwas found to be almost the same as that of melt-blown air-filter papers. Even after being water-soaked 50 times, the filteringefficiency of the nanofiber air-filter paper was still higher. Interestingly, the nanofiber membrane materials doped with CNTalso exhibited excellent sound-absorption abilities. Thus, the composite nanofiber material could potentially be applied toareas with serious air pollution and high noise pollution.