fig2
![Portable green energy out of the blue: hydrogel-based energy conversion devices](https://image.oaes.cc/f745047f-e08d-4f49-b493-e9d51d342ce9/5477.fig.2.jpg)
Figure 2. The scope of the present review including hydrogel-based ionic thermoelectric systems, hydrovoltaic devices, and their hybrids.
Figure 2. The scope of the present review including hydrogel-based ionic thermoelectric systems, hydrovoltaic devices, and their hybrids.
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