摘要
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(CH3COO)2和FeSO4为金属离子原料,控制Ni2+∶Fe2+的摩尔比为3∶1和金属离子(Fe2++Ni2+)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FeNi3/Ni3-xS2/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FeNi3/Ni3-xS2/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.
Abstract
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)2 and 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.
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