珠链状FeNi_(3)/Ni_(3-x)S_(2)/C纳米催化剂的制备与析氧性能

Preparation and oxygen evolution reaction properties of bead-chain FeNi_(3)/Ni_(3-x)S_(2)/C nano-catalysts

在碱性环境下电解水制氢过程中,FeNi基复合材料是一类最有前途替代传统贵重金属的催化剂。以Ni(CH_(3)COO)_(2)和FeSO_(4)为金属离子原料,控制Ni^(2+):Fe^(2+)的摩尔比为3:1和金属离子(Fe^(2+)+Ni^(2+))总浓度为0.6 mol/L。以PVA为胶体剂,采用静电纺丝与气氛热处理技术制备前驱体纤维,再经1000℃气氛热处理,通过Ni,Fe,S元素的原位反应,成功制备了珠链状的FeNi_(3)/Ni_(3-x)S_(2)/C混晶复合纳米材料。结果表明,纳米珠链的直径约为200 nm,链珠的表面均呈蓬松状,Fe,Ni,S和C元素均匀分布于纳米珠链基体中。电化学分析表明,由1000℃气氛热处理制备的FeNi_3/Ni_(3-x)S_(2)/C混晶复合催化剂,在1 mol/L的KOH水溶液中表现出优异的析氧(OER)性能,在10 mA·cm^(-2)时,表现出278.59 mV的过电位。

In the process of hydrogen production from water splitting in alkaline environment,FeNi-based composites are one of the most promising catalysts to replace noble metals.Using Ni(CH3COO)2and FeSO4 as raw materials of metal ions,the molar ratio of Ni2+∶Fe2+was controlled at 3∶1 and the total concentration of metal ions(Fe2++Ni2+)was 0.6 mol/L.FeNi3/Ni3-xS2/C composite nanomaterials were successfully prepared by in situ reaction of the elements of Ni,Fe,S with electrospinning and atmosphere heat treatment at 1000℃.The results show that the diameter of the nanoscale bead-chain is about 200 nm,the surface of the bead-chain is fluffy,and the elements of Fe,Ni,S,C are uniformly distributed in the nanoscale bead-chain matrix.The electrochemical analysis shows that the catalyst prepared from the FeNi3/Ni3-xS2/C composite after heat treatment in 1000℃atmosphere exhibites excellent oxygen evolution reaction(OER)properties in 1 mol/L KOH aqueous solution,and the overpotential is 278.59 mV.