Abstract
Abstract Ni3S2/g-C3N4 composite based photoanodes were constructed through hydrothermal method and electrophoretic deposition technique. Photoelectric properties of the material were assessed by measuring open circuit potential (OCP), photocurrent density versus time (I-t), electrochemical impedance spectroscopy (EIS) and Mott-Schottky plots. The Ni3S2 particles were wrapped in the g-C3N4 ribbons, forming a tight interface contact. The incorporation of Ni3S2 increases the utilization efficiency of visible light. The matching combination of Ni3S2 and g-C3N4 boosts the separation efficiency of the photoinduced carriers and strengthens the cathodic protection performance of g-C3N4 for 304 stainless steel. Under visible-light irradiation, Ni3S2/g-C3N4 composite prepared in the bath of 4 mM Ni(NO3)2·6H2O exhibited photocurrent density of 18 μA/cm2. The open circuit potential of the NS/CN-4 photoanode is −486 mV, about 110 mV lower than that of the pristine g-C3N4.
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