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![Strained carbon steel as a highly efficient catalyst for seawater electrolysis](https://image.oaes.cc/fe71c2c5-edb0-4f29-a49d-37e01caaa6cc/4749.fig.4.jpg)
Figure 4. (A) LSV curves of Pt plate and CS-8t samples with various numbers of indents, showing their ECSA-normalized activities. (B) Linear fits of η10 and TOF values with number of indents. (C) Nyquist plots of Pt plate and CS-16 sample. (D) Stability tests of Pt plate and CS-16 sample using CP and (inset) SEM image of an indent (scale bar: 500 μm).