Effects of manganese nitrate concentration on the performance of an aluminum substrate 尾-PbO₂-MnO₂-WC-ZrO₂ composite electrode material

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• 作者：Haitao Yang ; Buming Chen ; Huanrong Liu ; Zhongcheng Guo ; Yongchun Zhang ; Xuelong Li ; Ruidong Xu
• 关键词：Composite electrode material ; Al substrate ; 尾-PbO2&ndash ; MnO2&ndash ; WC&ndash ; ZrO2 ; Electrochemical oxidation co-deposition ; Manganese nitrate concentration
• 刊名：International Journal of Hydrogen Energy
• 出版年：25 February, 2014
• 年：2014
• 卷：39
• 期：7
• 页码：3087-3099
• 全文大小：2615 K

文摘

An Al/conductive coating/伪-PbO₂-CeO₂-TiO₂/尾-PbO₂-MnO₂-WC-ZrO₂ composite electrode material was prepared through electrochemical oxidation co-deposition on an Al/conductive coating/伪-PbO₂-CeO₂-TiO₂ substrate. The effects of manganese nitrate concentration on the chemical composition, electrocatalytic activity, and stability of the composite anode material were investigated using energy dispersive X-ray spectroscopy, anode polarization curves, quasi-stationary polarization curves, electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray diffraction. Results revealed that the WC and nano-ZrO₂ content in the 尾-PbO₂-MnO₂-WC-ZrO₂ composite coatings increased with increasing manganese nitrate concentration. Moreover, the highest values of 6.61聽wt% and 3.51聽wt%, respectively, were achieved at 80聽g聽L^鈭? manganese nitrate. PbO₂ content decreased and MnO₂ content increased with the increasing manganese nitrate concentration; both the descending and ascending trends were nonlinear. The Al/conductive coating/伪-PbO₂-CeO₂-TiO₂/尾-PbO₂-MnO₂-WC-ZrO₂ composite electrode obtained at 80聽g聽L^鈭? manganese nitrate concentration in plating solution exhibited reduced overpotential for oxygen evolution (0.610聽V at 500聽A聽m^鈭?), highest electrocatalytic activity, longest service life (360聽h at 40聽掳C in 150聽g聽L^鈭? H₂SO₄ solution at 2聽A聽cm^鈭?), and lowest cell voltage (2.75聽V at 500聽A聽m^鈭?). Furthermore, the composite coating obtained with 80聽g聽L^鈭? manganese nitrate had uniform crystal grains. The deposit formed was flat, dense, and crackless.