堿性介質(zhì)中多孔納米結構鎳/鈀-鎳電極上甲醇電氧化反應(英文)

編號：NMJS04176

篇名：堿性介質(zhì)中多孔納米結構鎳/鈀-鎳電極上甲醇電氧化反應(英文)

作者：Mir Ghasem Hosseini； Mehdi Abdolmaleki； Sajjad Ashrafpoor；

關鍵詞：Methanol electro-oxidation Palladium nanoparticle Galvanic replacement Cyclic voltammetry Electroche

機構： Electrochemistry Research Laboratory,Department of Physical Chemistry,Chemistry Faculty,University o

摘要： A nanostructured Ni/Pd-Ni catalyst with high activity for methanol oxidation in alkaline solution was prepared by electrodeposition followed by galvanic replacement, that is, electrodeposition of Ni-Zn on a Ni coating with subsequent replacement of the Zn by Pd at the open circuit potential in a Pd-containing alkaline solution. The surface morphology and composition of the coatings were examined by energy dispersive X-ray spectroscopy and scanning electron microscopy. The Ni/Pd-Ni coatings were porous and were composed of discrete Pd nanoparticles of about 58 nm. The electrocatalytic activity of the Ni/Pd-Ni electrodes for the oxidation of methanol was examined by cyclic voltammetry and electrochemical impedance spectroscopy. The onset potentials for methanol oxidation on Ni/Pd-Ni were 0.077 V and 0.884 V, which were lower than those for flat Pd and smooth Ni electrodes, respectively. The anodic peak current densities of these electrodes were 4.33 and 8.34 times higher than those of flat Pd (58.4 mA/cm2 vs 13.47 mA/cm2) and smooth Ni (58.4 mA/cm2 vs 7 mA/cm2). The nanostructured Ni/Pd-Ni electrode is a promising catalyst for methanol oxidation in alkaline media for fuel cell application.