Figure 6: Electrochemical characterization.
From: A nickel iron diselenide-derived efficient oxygen-evolution catalyst
(a) Polarization curves; (b) overpotential required for J=10 mA cm−2; (c) current densities at η=250 mV; and (d) Tafel plots for NixFe1−xSe2-DO, NiFe LDH, NiSe2-DO, NiSe-DO and NF. The error bar represents the range of results from three independent measurements. (e) Capacitive J versus scan rate for NixFe1−xSe2-DO and NiFe LDH. The linear slope is equivalent to twice of the double-layer capacitance Cdl. (f) Chronopotentiometric measurements of OER at 10 mA cm−2 using NixFe1−xSe2-DO as catalyst. The inset shows the calculated versus actual oxygen production catalyzed by at a constant current of 1 mA. The calculated value represent the expected amount of O2 assuming a quantitative Faradaic yield for O2 formation.
