時間：2026-10-30(五) 15:20 pm

講題：Enhancing the Performance and Stability of Alkyl Viologens

講者 :  何國川 教授

服務單位：台灣大學 化學工程學系

地點：華立廳

主持人：許梅娟教授

摘要：

    In this presentation, I will focus on some strategies to enhance the electrochromic performance and stability of alkyl viologens. The talk will be divided in two parts. The first part deals with synthesis of three kinds of alkyl viologens with different alky chains on the bipyridinium. After a desirable initial transmittance change was obtained, a UV-cured polymer electrolyte containing polymer ionic liquid (PIL) was introduced to the viologen-based electrochromic device (ECD). By controlling the weight percentage of the PIL, different curing degrees of the polymer electrolytes were obtained and led to an improved stability of the viologen-based ECD because of the immobilization of viologen. This observation was explained by calculating the apparent diffusivity (Dapp) of the redox species in the viologen-based ECD under various curing degrees. An effective coloration efficiency was proposed to account for the extremely low coloration efficiency associated with the presence of the recombination current reported in literatures. 

    In the second talk, a new approach was proposed to address the undesirable dimer formation. Five novel fluorine-substituted benzyl viologen (FSBV) were synthesized through a multi-step route based on the fluorine-atom count on the viologen moiety. It was found that the family of FSBV-based ECDs demonstrated suppressed dimerization tendency, higher optical contrast, fast response time, and enhanced cycling stability compared to the pristine benzyl viologen-based device. The exciting feature of this study lies in the deployment of a highly sensitive and non-invasive technique, electrochemical quartz crystal microbalance (EQCM), to monitor the ultrasmall mass transmutations caused by synthesized chromophores at the electrode/ electrolyte interface.

    Finally, I will briefly touch upon the major difference between academic research and industrial development from my own perspective.

學歷：

美國University of Rochester化工系博士 (1982~1986)
國立成功大學化工系碩士 (1978~1980)
國立成功大學化工系學士 (1974~1978)

經歷：

國立台灣大學「名譽教授」(2026~迄今)
國立台灣大學「特聘教授」(2008~2026)
國立台灣大學化學工程學系教授 (1998~2008)
國立台灣大學化學工程學系副教授 (1994~1998)
國立成功大學化學工程學系副教授 (1993~1994)
PPG Industries, Inc. (Pittsburgh, PA, USA) 高等技術研發部研究計畫工程師 (1990~1993)
PPG Industries, Inc. (Pittsburgh, PA, USA) 高等產品研發部資深研究工程師 (1986~1990)