ハロゲン結合は,より高い染料感受性の太陽電池を促進する
Sarah J C Simon1, Fraser G L Parlane1, Wesley B Swords2
1Departments of Chemistry and Chemical & Biological Engineering, The University of British Columbia , 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
Journal of the American Chemical Society
|August 13, 2016
まとめ
染料感受性太陽電池 (DSSC) のハロゲン結合は光電圧を高める. 染料の重いハロゲンは染料の再生速度を向上させ,全体のセル性能とオープン回路電圧 (VOC) を高めます.
科学分野:
- 材料科学
- 太陽光発電
- 電気化学
背景:
- 染料感受性太陽電池 (Dye-sensitized solar cells,DSSC) は,有望な光伏技術である.太陽電池は,太陽光発電の技術である.
- 染料再生と光伏の最適化は DSSCの効率化に不可欠です.
- ハロゲン結合は,光伏材料で十分に研究されていない相互作用です.
研究 の 目的:
- DSSCにおけるハロゲン結合相互作用の役割を調査する.
- ハロゲン置換剤が染料再生率 (kreg) に与える影響を測定する.
- 染料再生運動とオープン回路電圧 (VOC) の強化を相関させる.
主な方法:
- 異なるハロゲン置換剤を用いたトリアリアミン基染料の合成と特徴づけ
- これらのカスタマイズされた染料と核性電解質 (I) を使用してDSSCを製造する.
- 染料再生速度定数 (kreg) とオープン回路電圧 (VOC) の測定
主要な成果:
- より重いハロゲン置換剤を使用した染料は,染料再生の速度定数 (kreg) が著しく高かった.
- DSSCのオープン回路電圧 (VOC) は,観測されたクレグ値と直接相関しています.
- 光酸化染料と電解質の間のハロゲン結合相互作用の直接的な証拠が観察されました.
結論:
- DSSCの光電は染料の再生速度 (kreg) に敏感であることが実証されています.
- 染料と電解質の間のハロゲン結合相互作用は,DSSCの性能を効果的に高めることができます.
- ハロゲンの戦略的組み込みは,DSSCの染料再生と光電力の改善への道を提供します.
関連する概念動画
01:04Hydrogen Bonds
15.8K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
15.8K
02:45Alkyl Halides
21.1K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
21.1K
03:01Halogens
24.0K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
24.0K
03:35Hybridization of Atomic Orbitals II
50.1K
sp3d and sp3d 2 Hybridization
50.1K
02:45Valence Bond Theory
51.1K
Overview of Valence Bond Theory
51.1K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.4K