수소발생반응을 위한 Ni₄Cr 나노 섬유 전기화학 촉매 합성 및 특성 분석

Hydrogen evolution reaction(HER) was studied over Ni₄Cr nanofibers(NFs) prepared by electrospinning method and oxidation/reduction heat treatment for alkaline water electrolysis. The physicochemical and electrochemical properties such as average diameter, lattice parameter, HER activity of synthesized Ni₄Cr NFs could be modified by proper electrospinning process condition and reduction temperature. It was shown that Ni₄Cr NFs had average diameter from 151 to 273 nm. Also, it exhibited the overpotential between 0.419 V and 0.526 V at 1 mA/㎠ and Tafel slope of -334.75 mV to -444.55 mV per decade in 1 M KOH solution. These results indicate that Ni₄Cr NFs with reduction heat treatment at 600 oC show thinnest diameter and highest HER activity among the other catalysts.