Fig. 4. Degradation process of the calcium alginate film. (a) The output voltage of the fabricated TENG with the degradation time. (b) Weight loss of the calcium alginate film with the thickness of 100 μm depended on the degradation time at room temperature. The insets show the images indicating the degradation process of the calcium alginate film. (c) Weight loss of the calcium alginate film depended on the film thickness after 12 h at room temperature. (d) The complete degradation time of the calcium alginate film with the thickness of 100 μm depended on the environment temperature.
