Kinetics of the hydrogen evolution reaction on Ni-(Ebonex...

来自 : www.ixueshu.com/h5/document/f9 发布时间：2021-03-25

摘要：The hydrogen evolution reaction (HER) was studied on Ni, Ni-Ebonex and Ni-(Ebonex-Ru) coatings in 1 mol dm -3 NaOH solution at 25 degC. The composite coatings were electrodeposited from a nickel Watts-type bath containing suspended Ebonex (chemical composition mainly Ti 4O 7) or Ebonex-supported Ru(10 wt.%) particles (0-10 g dm -3) onto Ni 40 mesh substrate. The electrodes were investigated by cyclic voltammetry (CV), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in combination with energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), electrochemical impedance spectroscopy (EIS) and polarization measurements. These investigations showed that the roughness factor of the Ni-(Ebonex-Ru) and the Ni-Ebonex coating was 29 and 6 times higher than that of a pure Ni coating, respectively. In the whole potential range of the HER only one Tafel slope of about -120 mV was present at the polarization curves of Ni and Ni-Ebonex electrodes, with increased activity of the latter being attributed only to the increase of the electrochemically active surface area. The Ni-(Ebonex-Ru) electrodes exhibited the highest intrinsic catalytic activity with two Tafel slopes, indicating also that the HER takes place exclusively on Ru active sites. [All rights reserved Elsevier].
(chemical analysis); X-ray chemical analysis/ intrinsic catalytic activity; Ni-Ebonex electrodes; Ni electrodes; Tafel slope; polarization measurements; EIS...爱学术,谷歌学术,百度学术,知网,万方,免费期刊论文下载,毕业论文文献下载,免费论文网,期刊下载,学术期刊,核心期刊论文库,国内免费期刊,论文范文查找,国内外文献,国外免费图书,PPT模板免费下载,pdf转word爱学术是一家专业的学术文献分享平台，覆盖各个行业期刊论文，学位论文，会议论文，标准，专利等各类学术资源，是国内最大的学术文献交流中心和论文资源免费下载网站。Kinetics of the hydrogen evolution reaction on Ni