Preparation of Co-Fe-Gd/NF electrodes by electrodeposition in deep eutectic solvents and study of their hydrogen precipitation properties
In order to prepare inexpensive hydrogen precipitation electrode catalysts with high efficiency in alka-line environment,five Co-Fe-Gd/NF electrode catalysts were prepared by electrodeposition in choline chloride-urea(ChCl-urea)with different deposition potentials.The electrode surface morphology,elemental content and distribution were characterized by SEM and EDX,and the chemical properties of the electrode surface were characterized by XPS.The combination of LSV,EIS and CV electrochemical test results showed that the Co-Fe-Gd/NF-3 electrode prepared at-1.24 V deposition potential possessed excellent hydrogen precipitation catalytic performance,with an overpotential of only 71 mV at 10 mA/cm2,a minimum Tafel slope(45 mV/dec).The smallest Tafel slope and charge transfer resistance(0.28503 Ω/cm2)indicate that the electrode possesses a fas-ter kinetic process for hydrogen precipitation reaction,and the maximum electrochemically active surface area(ECSA)is 390.5,which provides more reactive sites for the hydrogenation process.Cyclic voltammetric dura-bility tset and I-t test were performed on the electrode,and the results showed that the Co-Fe-Gd/NF-3 elec-trode was stable in alkaline environments.
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