Water splitting and urea splitting are one of the most fascinating ways to produce clean energy. In this experiment, the presence of the Sn ion is regulated by modulating the amount of the ion introduced, so as to investigate its influence on the electrochemical performance of this NiFe LDH electrode. What is noteworthy is that the Sn-NiFe LDH/NF electrode exhibited superior oxygen evolution (overpotential of 260 mV @10 mA cm-2) and urea oxidation (potential of 1.35 V @10 mA cm-2) properties. The catalytic performance of this Sn6O4(OH)4@NiFe LDH/NF-1 material is very poor. Experimental analysis also shows that this Sn6O4(OH)4 material is unfavorable to water adsorption. The above results prove that this NiFe LDH/NF electrode is an reactive center of catalytic reaction, and the formation of inert Sn6O4(OH)4 material will cover the reaction site of this NiFe LDH/NF material, resulting in poor catalytic activity. Different forms of Sn ions will affect the electrochemical performance of materials, so the effects of ions on materials can be discussed through doping or the construction of heterogeneous interfaces. The work will propose novel insights into how the presence of ions affects the catalytic activity of materials.

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