Karimpour Ahmad, Norouzi Parviz, Ganjali Mohammad Reza
Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, 1417614411, Iran.
J Nanosci Nanotechnol. 2019 Nov 1;19(11):7330-7338. doi: 10.1166/jnn.2019.16726.
Layer-by-layer of Ni/Ni(OH)₂ particles were deposited on Steel Gauze (SG) electrode via cathodic electrodeposition. The system with two electrodes was selected for electrodeposition in the galvanostatic condition. Electrodeposition of the first layer of Nickel was conducted in the electrochemical cell with an SG substrate as a cathode. This electrode was fixed between two parallel graphite anodes and electrodeposition was performed from a mixture of NiCl₂, NH₄Cl, NaCl solution. Electrodeposition of the second layer of Ni(OH)₂ on the Ni layer which has been formed in the first step, was carried out in the same way from a solution containing Ni(NO₃)₂. TG, XRD and SEM techniques were used for the characterization of the prepared SG/Ni/Ni(OH)₂ electrode. The prepared SG/Ni/Ni(OH)₂ electrode was analyzed by electrochemical techniques such as Cyclic Voltammetry (CV), galvanostatic charge-discharge and Electrochemical Impedance Spectroscopy (EIS). The SG/Ni/Ni(OH)₂ electrode demonstrated high specific capacity (1308 C g at the scan rate of 5 mV s) and excellent cycling ability (8.9% capacity decay at the current density of 50 A g after 1000 cycle).
通过阴极电沉积法在钢丝网（SG）电极上逐层沉积Ni/Ni(OH)₂颗粒。在恒电流条件下，选择双电极系统进行电沉积。以SG基底作为阴极，在电化学池中进行第一层镍的电沉积。该电极固定在两个平行的石墨阳极之间，电沉积从NiCl₂、NH₄Cl、NaCl溶液的混合物中进行。在第一步中形成的镍层上，以同样的方式从含有Ni(NO₃)₂的溶液中进行第二层Ni(OH)₂的电沉积。采用TG、XRD和SEM技术对制备的SG/Ni/Ni(OH)₂电极进行表征。通过循环伏安法（CV）、恒电流充放电和电化学阻抗谱（EIS）等电化学技术对制备的SG/Ni/Ni(OH)₂电极进行分析。SG/Ni/Ni(OH)₂电极表现出高比容量（扫描速率为5 mV s时为1308 C g）和优异的循环性能（1000次循环后，在电流密度为50 A g时容量衰减8.9%）。
