Polyaniline (PANI) nanofibers have been prepared by potentiodynamic electrodeposition on nickel fromaniline in sulfuric acid solution. By varying the scan rate during deposition, polyaniline nanofibers withdifferent diameter and length have been obtained, as shown by scanning electron microscopy. The layerof polyaniline nanofibers deposited on nickel has an open and porous structure at low scan rates and amore compact structure at high scan rates. The modified Ni/PANI electrodes were used for the hydrogenevolution reaction and their electrocatalytic activity was evaluated by linear Tafel polarization andelectrochemical impedance spectroscopy in 0.5 M H2SO4 solution. It has been shown that the presenceof polyaniline nanofibers layer increases the electrocatalytic activity for hydrogen evolution reaction ascompared to plain nickel electrode, as indicated by the increase of the apparent exchange current densityby two orders of magnitude and the decrease of overpotential for hydrogen evolution reaction.
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机译：通过在硫酸溶液中的镍含镍上的电量电沉积来制备聚苯胺（PANI）纳米纤维。通过改变沉积期间的扫描速率，已经获得了扫描电子显微镜所示的扫描直径和长度的聚苯胺纳米纤维。沉积在镍上的聚苯胺纳米纤维的层在低扫描速率下具有开口和多孔的结构，并且在高扫描速率下浑浊的结构。改性的Ni / PANI电极用于氢化反应，并通过在0.5M H 2 SO 4溶液中通过线性Tafel偏振和电化学阻抗光谱评估其电催化活性。已经表明，聚苯胺纳米纤维层的存在增加了催化剂的电催化活性作为普通镍电极的氢进化反应，如表明交换电流密度的增加，两个数量级的增加和氢进化反应的过电位的降低。
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