Revolutionizing Renewable Energy: Innovative Salt Battery Efficiently Harvests Osmotic Power

An improved membrane dramatically increased the amount of osmotic power harvested from salt gradients, like those found in estuaries where salt water meets fresh water . Credit: Adapted from ACS Energy Letters 2024, DOI: 10.1021/acsenergylett.4c00320

Estuaries — where freshwater rivers meet the salty sea — are great locations for birdwatching and kayaking. In these areas, waters containing different salt concentrations mix and may be sources of sustainable, “blue” osmotic energy. In the journal, researchers report creating a semipermeable membrane that harvests osmotic energy from salt gradients and converts it to electricity.

Previous research suggests that improving both the flow of ions across the RED membrane and the efficiency of electron transport would likely increase the amount of electricity captured from osmotic energy. So, Dongdong Ye, Xingzhen Qin, and colleagues designed a semipermeable membrane from environmentally friendly materials that would theoretically minimize internal resistance and maximize output power.

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