[15a-PB1-1~16] 9.2 Nanowires and Nanoparticles

[15a-PB1-11] Fabrication of Silicon Nanoparticles from Silicon Swarf and Hydrogen Generation

〇Katsuya Kimura^1,3, Kentaro Imamura^1,3, Taketoshi Matsumoto^1,3, Yayoi Kanatani^3,2, Toru Higo^2,3, Hikaru Kobayashi^1,3 (1.ISIR Univ, 2.Nisshin kasei, 3.CREST-JST)

Keywords:nano particles,Silicon,Hydrogen

Hydrogen has been studied as an energy carrier in the next generation. Bulk Silicon does not react with water while Silicon nanoparticles (Si NPs) easily do, resulting in generation of hydrogen. We are studying fabrication of Si NPs from Si swarf. Si swarf is an industrial waste and is generated during slicing Si ingots to produced Si wafers for Si solar cells with nearly the same weight as that of Si wafers. The production cost for Si NPs can be reduced remarkably by use of Si swarf. In this study, the Si NPs are produced from Si swarf and the reaction mechanism with water to generate hydrogen is investigated.
Si swarf is milled with beads mill to fabricate Si NPs. X-ray diffraction peaks is assigned to crystalline Si. The maximum distribution diameter of the volume distribution changes from 25nm to 6.1nm after beads milling.
Si NPs are immersed in 20 ml KOH alkaline aqueous solutions with various pHs at room temperature. A using pH13.9 KOH aqueous solution, 1150ml hydrogen is generated from 1g Si NPs. The maximum hydrogen rate is 250ml/ min.g at RT. Relationship of hydrogen volume and reaction time discussed.