New Article: Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes

A new article out of Prof. Ning Yan’s lab in collaboration with Prof. Lian’s lab (Materials Engineering) has been published in Chemistry Europe’s ChemSusChem written by Dr. Nicolas Tanguy, Dr. Haoran Wu, Dr. Sandeep Niar, Prof. Keryn Lian and Prof. Ning Yan. This article explores using lignin cellulose nanofibrils in fabricating flexible supercapacitor electrodes for wearable electronics.The article was selected as Very Important Paper by the Editors of the journal, invited for an article in Chemistryviews.org, and for a Cover art as well. More to come!

Click here to view the article

Abstract

The increasing demand for wearable electronics has driven the development of supercapacitor electrode materials toward enhanced energy density, while being mechanically strong, flexible, as well as environmentally friendly and low‐cost. Taking advantage of faradaic reaction of quinone groups in natural lignin that is covalently bound to the high‐strength cellulose nanofibrils, the fabrication of a novel class of mechanically strong and flexible thin film electrodes with high energy storage performance is reported. The electrodes were made by growing polyaniline (PANI) on flexible films composed of lignin‐containing cellulose nanofibrils (LCNF) and reduced graphene oxide (rGO) nanosheets at various loading levels. The highest specific capacitance was observed for the LCNF/rGO/PANI electrode with 20 wt% rGO nanosheets (475 F g−1 at 10 mV s−1 and 733 F g−1 at 1 mV s−1), which represented a 68 % improvement as compared to a similar electrode made without lignin. In addition, the LCNF/rGO(20)/PANI electrode demonstrated high rate performance and cycle life (87 % after 5000 cycles). These results indicated that LCNF functioned as an electrochemically active multifunctional component to impart the composite electrode with mechanical strength and flexibility and enhanced overall energy storage performance. LCNF/rGO(20)/PANI electrode was further integrated in a flexible supercapacitor device, revealing the excellent promise of LCNF for fabrication of advanced flexible electrodes with reduced cost and environmental footprint and enhanced mechanical and energy storage performances.

Article Chosen as Green Chemistry Editor’s Choice

The article Barking up the right tree: biorefinery from waste stream to cyclic carbonate with immobilization of CO2 for non-isocyanate polyurethanes by Heyu Chen, Prashant Chauhan and Ning Yan has been selected by editor Buxing Han to be highlighted as a Green Chemistry Editor’s Choice.

The blog post showcasing the publication can be found here and is publically accessible until Feb 2021.

Recent Publication is Now Featured on “Advances in Engineering” as a Key Scientific Article

Advances in Engineering—which recognizes important findings in engineering fields and reports timely engineering research news—has recently labeled a research work that came from Professor Ning Yan’s group as a “key scientific article contributing to science and engineering research excellence.”

Report link: https://advanceseng.com/lignin-containing-cellulose-nanofibril-application-pmdi-wood-adhesives-drastically-improved-gap-filling-properties-robust-bondline-interfaces/

This work was done by University of Toronto researchers: Heyu Chen (PhD candidate), Dr. Sandeep Nair, Dr. Prashant Chauhan and led by distinguished professor, Prof. Ning Yan; they investigated the effect of lignin-containing nanocellulose (LCNF) on the reinforcing performance of pMDI wood adhesives. As concluded by Advances in Engineering: “Sustainable LCNF from renewable biomass will advance the development of high-performance pMDI adhesives for wider practical applications.”

For further information, this work is published in Chemical Engineering Journal.

Chen, H., Nair, S., Chauhan, P., & Yan, N. (2019). Lignin containing cellulose nanofibril application in pMDI wood adhesives for drastically improved gap-filling properties with robust bonding line interfaces. Chemical Engineering Journal, 360, 393-401.

Article from the Yan Lab makes the Cover Page

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A recently published article by current Post Doc, Nicolas Tanguy, former Post Doc Mohammad Arjmand and Ning Yan was featured on the cover of Material Interfaces.

Abstract

Combining polyaniline and graphene doped with nitrogen favors the formation of electrical heterojunctions in the nanocomposite. During exposure to ammonia gas, the concurrent immobilization of charge carriers by dedoping of polyaniline and increasing depletion layer depth causes a more pronounced change of the electrical resistance of the nanocomposite as compared to pristine polyaniline. Further details can be found in article number 1900552