Electricity Generation with Sodium Alginate Hydrogel for Osmotic Energy Harvesting

• Published in: Industrial & engineering chemistry research Vol. 62; no. 50; pp. 21666 - 21672
• Main Authors: Pei, Junxian, Chen, Guopeng, Li, Zining, Zhou, Zuwei, Chen, Aofei, Xie, Shangzhen, Jiang, Xingchi
• Format: Journal Article
• Language: English
• Published: American Chemical Society 20.12.2023
• Subjects: Materials and Interfaces
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.3c02570

Seawater covers 75% of the Earth’s surface, and it exists in nature as a vast resource. Harvesting energy from this tremendous resource provides a promising green approach to tackle the problem of electricity shortage. Herein, we develop a simple and effective ion-selective hydrogel membrane to harvest the osmotic energy from seawater and salt solutions at room temperature. Sodium alginate hydrogel, an ion-transport medium with numerous functional groups and a hierarchical porous structure, shows excellent ion-transport and ion-sieving capability in salt solutions. A single device can output a 0.16 V open-circuit voltage and 0.048 μW power in real seawater. Through a simple serial connection, the output voltage of the device can be further linearly improved to charge capacitors and thus light a light-emitting diode (LED) lamp. This research provides a new direction of material selection for hydrovoltaic electricity generation technology, which is conducive to expanding the practical applications of energy harvesting.