2024-2-13 アイルランド・リムリック大学（UL）
◆これにより、従来は自然木からのセルロースを使用していた技術が、廃木材からのリグニンにも適用され、より循環的で持続可能な経済に貢献することができるようになりました。この研究は、「Advanced Functional Materials」誌に掲載されました。
＜関連情報＞
- https://www.ul.ie/research/news/university-of-limerick-study-reveals-eco-friendly-way-to-generate-power-from-waste
- https://onlinelibrary.wiley.com/doi/10.1002/adfm.202306427
リグニン由来のイオン伝導膜で低グレードの熱エネルギーハーベスティングを実現 Lignin-Derived Ionic Conducting Membranes for Low-Grade Thermal Energy Harvesting
Muhammad Muddasar, Mohammad Ali Nasiri, Andres Cantarero, Clara Gómez, Mario Culebras, Maurice N. Collins
Advanced Functional Materials Published: 14 December 2023
DOI:https://doi.org/10.1002/adfm.202306427
Abstract
Wood-based ionic conductive membranes have emerged as a new paradigm for low-grade thermal energy harvesting applications due to their unique andtailorable structures. Herein, a lignin-derivedionic conducting membrane with hierarchical aligned channels is synthesized viaa double network crosslinking approach. Their excellent thermal stability andsuperior swelling ratio allow their optimization as low-grade heat recovery technologies. Several vertically aligned nanoscaleconfinements are found in the synthesized membranes, contributing towardenhanced ionic diffusion. Among all the combinations, the membrane comprising69.2 wt.% of lignin and infiltrated with 0.5 m KOH exhibits anexceptional ionic figure of merit (ZTi) of 0.25, relatively higher ionic conductivity(51.5 mS cm‒1), lower thermal conductivity(0.195 W m‒1·K), and a remarkable ionic Seebeck coefficientof 5.71 mV K‒1 under the application of an axialtemperature gradient. A numerical model is also utilized to evaluate theveracity of experimental observations and to gain a better understanding of thefundamental mechanisms involved in attaining such values. These results displaythe potential of lignin-basedmembranes for future thermal energy harvesting applications and are a new facetin thermoelectric energy conversion which is certain to pave the way forfurther investigations on sustainable ionic conductive membranes.
