Author : Kevin A. Click
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)
Book Synopsis Design and Synthesis of Organic Dyes for Solar Energy Conversion and Storage by : Kevin A. Click
Download or read book Design and Synthesis of Organic Dyes for Solar Energy Conversion and Storage written by Kevin A. Click and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 3 exploits the unique highly hydrophobic and large light absorption properties of the BH4 dye to answer the stability and wettability issues faced in solar driven water splitting applications. The unprecedented stability of the BH4 dye on NiO allowed the first use of low pH electrolytes to be used in p-type water splitting DSPECs. The ability to use acidic electrolytes likewise allowed the use of an acidically soluble and active earth abundant [Mo3S4]4+ homogeneous catalyst for the first time. Chapter 4 further utilizes the aqueous stability of the BH series dyes for aqueous based DSSCs. Utilizing water as the electrolyte solvent makes the already cost effective tandem DSSCs even more economical and environmentally friendly. The BH2 dye was used to fabricate entirely aqueous p-type DSSCs using the iodide/triiodide redox for the first time. The BH2 dye displayed aqueous p-type DSSC photocurrents greater than most non-aqueous p-type DSSCs and were stable for up to 4 months with no sign of photocathode degradation. Furthermore, aqueous tandem DSSC were fabricated with a completely aqueous electrolyte with all earth abundant materials with no use of any precious metals. Chapter 5 introduces a new dye (KC2) designed specifically for aqueous based dye sensitized electrodes. From what was learned in Chapters 2 – 4, there exists a dilemma between aqueous dye stability and wettability in the form of hydrophobicity. A novel layered amphiphilic structure is proposed to balance both the aqueous stability and wettability of dye sensitized films. The new amphiphilic KC2 dye was synthesized and fully characterized. It was compared to its purely hydrophobic analog (BH2) in all aspects including electrochemical, photo-physical and device performance properties. The KC2 dye doubles the aqueous wettability of sensitized NiO films and displays excellent stability identical to that of the hydrophobic BH2 dye. Finally from what was discovered from the KC2 dye, a new amphiphilic structure is proposed for further exploration. Chapter 6 summarizes the common experimental procedures and details used throughout the dissertation. More specific procedures relevant to each chapter are discussed in each corresponding chapter introduction.