A new semipermeable nanofluidic membrane has been developed in China that collects osmotic energy from salt gradients and converts it into electricity. The device achieved an output power density of 11.7 W/m
Renewable energy continues to advance with innovations that promise to transform our ability to harness natural resources in increasingly efficient and sustainable ways. A recent example of this innovation comes from China, where researchers have developed a new salt battery capable of capturing osmotic energy from estuaries with significantly higher efficiency than existing technologies.
Innovation in osmotic energy capture
What is osmotic energy?
Osmotic energy, also known as salt gradient energy or blue energy, is generated from the difference in osmotic pressure between freshwater and seawater. This type of energy is especially prevalent in estuaries, where these two types of water are found. Although the idea of harnessing this energy dates back to the 1950s, it was not until 1973 that the first devices for its exploitation were developed.
Technological advances in the salt battery
The study carried out by Anhui Agricultural University and Guangxi University has resulted in a battery that not only doubles the efficiency of reverse electrodialysis (RED) technologies available on the market, but also introduces an innovative design. The key to its success lies in a semipermeable membrane structured in layers of cellulose and plastic, which facilitates differentiated routes for the passage of ions and electrons, reducing internal electrical resistance and maximizing conductivity.
Highlights of the new salt battery
- Power density: The battery has achieved an output power density of 11.7 W/m², more than double that of commercial RED membranes.
- Durability: It has operated continuously for 16 days, demonstrating its ability to operate long-term under aquatic conditions.
Potential of osmotic energy in medicine and beyond
This technology not only shows promise for sustainable energy production, but also has potential applications in international medical systems. For example, it could be used to power medical devices in remote areas or to improve energy infrastructure in hospitals in coastal regions.
The salt battery represents a significant step towards the efficient use of natural resources in estuaries, offering a more sustainable and ecological future. With continued advancements and expansive applications, this technology could play a crucial role in the global transition towards renewable energy and more sustainable systems globally.
More information: acs.org
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