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Item type:Publication, Algal-based polysaccharides as polymer electrolytes in modern electrochemical energy conversion and storage systems: A review(Elsevier, 2020-12-19)In the last decade, the development of high-efficiency electrolytes based on polymeric materials has drawn increasing attention. Polysaccharides are widespread biopolymers with properties suitable for the fabrication of high-efficiency polymer electrolytes. In specific, algal-based polysaccharides are promising eco-friendly and biodegradable alternatives to conventional polymer electrolytes. This review focuses on the recent progress of polymer electrolytes based on algal polysaccharides. We set the basic consideration for high-performance polymer electrolytes and discuss the materials science aspects of algal-based polysaccharides involved. Then, we review the recent progress of algal polysaccharides-based electrolytes, including the various physical and chemical treatments applied for the enhancement of ionic conductivity and mechanical properties. Lastly, we summarize the applications of the algal polymer electrolytes in batteries, fuel cells, supercapacitors, and dye-sensitized solar cells and their performance. Algal polysaccharides are presented as biodegradable, cost-efficient, high-performance, and eco-friendly alternatives for the development of high-performance solid polymer electrolytes for modern electrochemical applications. - Some of the metrics are blocked by yourconsent settings
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Item type:Publication, Triboelectric Nanogenerators Based on Ulvan Biopolymer: Impact of Lithium Sulfate Doping on Electrical Output(John Wiley and Sons, 2025)The increasing demand for sustainable energy solutions has driven extensive research into energy harvesting devices, such as triboelectric nanogenerators (TENGs). Although various additives, including nanowires and salts, have been investigated to enhance the performance of biopolymer-based TENGs, the use of lithium salts in green algae-based TENGs remains unexplored. Herein, a series of TENGs are fabricated using ulvan, a biopolymer derived from the green algae Ulva nematoidea. To improve the output performance of these TENGs, the ulvan matrix is doped with lithium sulfate (Li2SO4) at concentrations of 0%, 10%, 20%, 30%, 40%, and 50% by weight. Dielectric permittivity measurements are conducted to calculate the surface charge density. The results show an increase from 0.94 nC cm−2 for the pristine film to 1.14 nC cm−2 at 30 wt% Li2SO4, beyond which further increases in salt concentration lead to a decrease in charge density. The incorporation of salts significantly enhances the electrical performance, with the 20% Li2SO4/ulvan device achieving a maximum power density of 0.156 W m−2, representing an 85.7% improvement compared to the pristine ulvan TENG. The open-circuit voltage (Voc) and short-circuit current also increase with salt concentration, with Voc reaching 87.71 V at 30% Li2SO4.1