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(a) LSV polarization curve of Co-FeS2/CoS2 heterostructure in KOH solutions of different pH; (b) Scatter plot corresponding to overpotential at current density 10 mV cm−2 in (a); (c) Tafel diagram of Co-FeS2/CoS2 heterostructure in KOH solutions of different pH; (d) Histogram corresponding to the slope of Tafel in (c).
