Figure 3
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(a–d) Low- and high-magnification (inset) TEM images of Co3O4-HoMSs and samples after phosphorization reaction for 2 h (B-CoP-HoMSs), 4 h (D-CoP-HoMSs), and 8 h (CoP-HoMSs). The scale bars of inset images are 50 nm. (e, f) HER LSV and Tafel plots of HoMS samples before and after grinding and Pt/C, recorded at a scan rate of 5 mV s−1 in 1.0 M KOH electrolyte. (g, h) OER LSV and Tafel plots of HoMS samples before and after grinding and RuO2, recorded at a scan rate of 5 mV s−1 in 1.0 M KOH electrolyte. (i) EIS Nyquist plots of HoMS samples before and after grinding. (j) Water contact angle images of 2 μL liquid drops on B-CoP-HoMSs, D-CoP-HoMSs, and CoP-HoMSs, and bubble contact angle images of HoMSs under water. Adapted from Ref. [18]. Copyright 2021, Wiley-VCH GmbH.
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