Preparation of iron-cobalt-nickel ternary catalyst for water electrolysis and study on its performance
A series of iron-cobalt-nickel hydroxide catalysts are prepared through hydrothermal method,and characterized.The influences of mole fraction of Fe-Co-Ni catalysts on the electrocatalytic performance of foam nickel electrode are evaluated.It is shown that the optimal preparation conditions for Fe-Co-Ni catalysts include a hydrothermal temperature of 60℃and a duration of 8 h.Under these conditions,the obtained sample demonstrates the maximum specific surface area as 59.61 m2·g-1.At a current density of 25 mA·cm-2,the oxygen evolution potential of the sample with 60 mol.%of Ni is only 1.35 V,while the lowest oxygen evolution voltage and overpotential of the sample with 20 mol.%of Co(OH)2 are 1.33 V and 100 mV,respectively.The sample with 20 mol.%of Fe(OH)3 shows the lowest impedance.The catalyst with the optimized iron-cobalt-nickel hydroxides molar ratio of 2∶2∶6 is coated on a nickel mesh electrode as a test sample,demonstrating a small chamber voltage of around 1.71 V at a current density of 2 000 A·m-2,and an overpotential of 420 mV under a large area electrode.
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