Fig. 3
Electrochemical stability of m-, c-, and o-CoSe2. a–c HER polarization curves of m-, c-, and o-CoSe2 catalysts before and after different potential cycles, respectively. Catalyst loading: ~1.02 mg cm−2. Sweep rate: 2 mV s−1. d Tafel plots for m-, c-, and o-CoSe2 catalysts derived from their initial polarization curves. e–g EIS Nyquist plots of the m-, c-, and o-CoSe2 catalysts before and after different potential cycles, respectively. h Chronopotentiometry (E ~ t) recorded on m-CoSe2 catalyst at the constant current density of 10 mA cm−2, exhibiting the exceptional long-term stability.
