種別 国内論文 No. 58 年度 2012
論文名 バイオ光化学電池によるバイオマスの太陽光完全分解と直接発電
著者名 金子正夫
掲載誌名 光学
バイオマス廃棄物や廃液は環境汚染の主要原因であるが、多量のエネルギーを有しているため太陽光エネルギーを利用して物質循環とエネルギー循環を同時に行う廃棄物処理システムを検討した。このシステムは、ナノ多孔質半導体(TiO2)薄膜被膜電極と酸素還元触媒電極を用いて紫外光で駆動する。現時点では小規模な発電力しか得られないが、高効率にCO2とN2にまで完全分解する。
Problems of sustainable energy resource and environmental cleaning were introduced, and a concept given to solve these issues. BioPhotoChemical Cell (BPCC) was proposed comprising a mesoporous n-semiconductor (SC, here TiO2) film photoanode coated on a conducting glass and an O2-reducing cathode capable if completely and efficiently photodecomposing biomass and its wastes in an aqueous solution involving also solid suspensions under solar UV-light irradiation with simultaneous electrical power generation. The principle and the mechanism were interpreted by a Schottky junction on a nanostructured n-SC thin film soaked in a biomass aqueous solution. The electrical power was presented by open circuit photovoltage, short circuit photocurrent, and Fill Factor (FF). Remarkably high quantum efficiencies (QEs) for the photocomposition were obtained. External QE based on total incident UV-light exceeding 2 (=200%) and internal QE based on activating UV photons exceeding 20 (2000%) were interpreted by an autooxidation mechanism of the photoactivated biomass.