α-Ni(OH)2/g-C3N4复合材料合成及其电化学性能研究

Synthesis and electrochemical properties of nickel hydroxide/carbon nitride composites

在制备α-Ni(OH)2纳米片和g-C3N4的基础上,通过水热法合成了α-Ni(OH)2/g-C3N4复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)对材料进行了结构表征,并用电化学工作站研究了复合材料的电化学性能。结果表明,经复合g-C3N4后α-Ni(OH)2纳米片尺寸明显变小,分散更加均匀;其中20.6%-g-C3N4/α-Ni(OH)2复合材料在以1 mol/L KOH电解液条件下,在10 mA/cm2电流密度下析氧过电势为333.5 mV,显著优于纯相g-C3N4和α-Ni(OH)2。为利用低成本的α-Ni(OH)2代替贵金属催化剂在电催化制氧商业化提供了可能。

Theα-Ni(OH)2/g-C3N4 composite was synthesized by hydrothermal method on the basis of preparation of nano-α-Ni(OH)2 sheet and g-C3N4.Materials were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM),and electrocatalytic performances of materials were investigated by electrochemical workstation.The results showed that the particles ofα-Ni(OH)2 were significantly smaller and more evenly dispersed after the combination of g-C3N4.When the content of g-C3N4/α-Ni(OH)2 was 20.6 wt%,the overpotential of the composite was 333.5 mV at the conditions of 10 mA/cm2 current density and 1 mol/L KOH electrolyte,significantly better than that of pure g-C3N4 andα-Ni(OH)2.This work provided a possibility for the commercialization of electrocatalytic oxygen production using low-cost Ni(OH)2 instead of noble metal catalyst.