Co‐Harvest Phase‐Change Enthalpy and Isomerization Energy for High‐Energy Heat Output by Controlling Crystallization of Alkyl‐Grafted Azobenzene Molecules

Author:

Gao Jian1,Feng Yiyu12,Fang Wenyu1,Wang Hui1,Ge Jing1,Yang Xiaoyu1,Yu Huitao1,Qin Mengmeng1,Feng Wei1ORCID

Affiliation:

1. School of Materials Science and Engineering Tianjin University Tianjin 300350 China

2. Key Laboratory of Materials Processing and Mold, Ministry of Education Zhengzhou University Zhengzhou 450002 Henan China

Abstract

Photoisomerization‐induced phase change are important for co‐harvesting the latent heat and isomerization energy of azobenzene molecules. Chemically optimizing heat output and energy delivery at alternating temperatures are challenging because of the differences in crystallizability and isomerization. This article reports two series of asymmetrically alkyl‐grafted azobenzene (Azo‐g), with and without a methyl group, that have an optically triggered phase change. Three exothermic modes were designed to utilize crystallization enthalpy (∆Hc) and photothermal (isomerization) energy (∆Hp) at different temperatures determined by the crystallization. Azo‐g has high heat output (275–303 J g−1) by synchronously releasing ∆Hc and ∆Hp over a wide temperature range (−79 °C to 25 °C). We fabricated a new distributed energy utilization and delivery system to realize a temperature increase of 6.6 °C at a temperature of −8 °C. The findings offer insight into selective utilization of latent heat and isomerization energy by molecular optimization of crystallization and isomerization processes.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Energy (miscellaneous),Waste Management and Disposal,Environmental Science (miscellaneous),Water Science and Technology,General Materials Science,Renewable Energy, Sustainability and the Environment

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