脱炭素エネルギー先導人材育成フェローシップ 2022年度
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wolle温室効果ガスの排出量を「実質ゼロ」とするためには、新たなイノベーションの創出が不可欠です。脱炭素社会の柱として、再生可能エネルギー由来の電力を利用して、水を電気分解し生成されるグリーン水素が挙げられます。私たちは「光触媒」という、水を太陽光から直接分解し水素を生成する水素の生産方法に注目しています。この手法は水の電気分解等の設備を必要としないため、低コストで直接水から水素を得ることができますので、グリーン水素の生産手法です。沈小烽さんは、効率よく水素を生産できる新しい光触媒の開発に取り組んでいます。10Q-Energy Innovator FellowshipXiaofengSHEN統合新領域学府オートモーティブサイエンス専攻博士後期課程2年カーボンニュートラル・エネルギー国際研究所 准教授Petroleum, coal, and natural gas are the main fossil fuels used as energy supply sources. However, burning fossil fuels produces toxic substances such as carbon dioxide (CO2), nitrogen oxides (NOx), and sulfur oxides (SOx), which have a significant negative impact on global warming and environmental pollution. In addi-tion, to realize a carbon-neutral society, the development of new alternative energy sources to fossil fuels is urgently needed. Hydrogen is a well-known renewable and clean energy source that can be produced by means of electrolysis, photocatalytic wa-ter splitting, thermochemical water splitting, photocatalysis, and methane reforming. Among these methods, photocatalytic water splitting using sunlight is considered as the most promising tech-nology for hydrogen production. However, most semiconductor catalysts, including titanium diox-ide (TiO2), exhibit a narrow light absorption range and a slow elec-tron transfer rate, which results in a limited photocatalytic efficiency and sunlight utilization (6 % component in sunlight). In this context, the introduction of a dye sensitizer that absorbs light in the visible-near-infrared (Vis-NIR) region has been demonstrated as an effec-tive tool to expand the light absorption range of semiconductor cata-lysts. In the resulting dye-sensitized photocatalytic systems, the overall sunlight utilization is effectively improved.Up to now, a large number of dye sensitizers, which can be categorized into metal complex dyes and nonmetal organic dyes, have been synthesized, among which ruthenium metal complexes stand out because of their broad spectral response, suitable ground state, long charge separation lifetime, and good chemical stability. However, the high cost and low molar absorption coef-ficient of ruthenium metal hinder its application on a large scale. In this regard, metal-free organic dyes are an attractive alternative owing to their low-cost raw materials and charge recombination lifetimes, which can be modified by molecular design. On the other hand, nanosheet structured materials have a larger surface area and more reaction sites than traditional bulk materials, which can greatly improve the reaction efficiency that has been widely investigated in recently years. However, mono-layer structured nanosheet materials are hardly to obtain.Therefore, in this work, the configuration of the dye junction was adjusted and designed to make dyes that can use visible -near-infrared light, and additionally introduced the function with nanosheet exfoliation, so that monolayer dye-sensitized nano-sheet materials can be obtained.指導教員からメッセージAcademy award of graduate school of integrated frontier sciences.渡邊 源規Development of highly activated monolayer nanosheet dye sensitized photocatalysts高活性化単層ナノシート色素増感型光触媒による水の完全分解沈 小烽05f

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