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Three-dimensional Ni-Co alloy hierarchical nanostructure as efficient non-noble-metal electrocatalyst for hydrogen evolution reaction

机译:三维Ni-Co合金分层纳米结构作为氢生成反应的高效非贵金属电催化剂

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Hydrogen is an ideal energy carrier with ultrahigh energy value that is believed to be the best candidate for replacement for fossil fuel. Thus, fabrication of novel materials and structures for this purpose is one of the important challenges of our times. In this study, Ni-Co nanocones as new structure was fabricated by electro-deposition method in the bath containing crystal modifier and electrocatalytic activity of these structures for HER was studied in 1.0 M KOH solution. Scanning electron microscope (SEM), X-ray diffraction (XRD) method and Atomic force microscopy (AFM) were used for physical characterization. Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and Chronopotentiometry were used for electrocatalytic activity evaluations. Fabricated Ni-Co alloy nanocones exhibited an enhanced electrocatalytic activity for HER. Best electrocatalytic activity was obtained for alloy prepared at Ni/Co salts ratio of about 8, in which eta(10) = -107 mV, eta(20) = -142 mV and eta(100) = -198 mV. This remarkable activity is mainly attributed to the high surface area of the nanocones and also synergistic effect between Ni and Co while decreasing the bubble resistance as a result of fabrication of nanocones. Additionally, the Ni-Co alloy catalyst displayed good durability and affords long-term electrolysis without activity degradation. This study offers a facile fabrication method for in situ growth of 3-D electrocatalyst and also provide deep insight into the relationship between active surface area, intrinsic catalytic activity and catalytic properties.
机译:氢是具有超高能量值的理想能量载体,被认为是替代化石燃料的最佳候选者。因此,为此目的制造新颖的材料和结构是当今时代的重要挑战之一。在这项研究中,Ni-Co纳米锥作为一种新结构,是通过在含有晶体改性剂的镀液中通过电沉积方法制备的,并且在1.0 M KOH溶液中研究了这些结构对HER的电催化活性。使用扫描电子显微镜(SEM),X射线衍射(XRD)方法和原子力显微镜(AFM)进行物理表征。线性扫描伏安法(LSV),电化学阻抗谱(EIS)和计时电位法用于电催化活性评估。制备的Ni-Co合金纳米锥对HER表现出增强的电催化活性。对于以大约8的Ni / Co盐比制备的合金,可以获得最佳的电催化活性,其中eta(10)= -107 mV,eta(20)= -142 mV和eta(100)= -198 mV。这种显着的活性主要归因于纳米锥的高表面积,还归因于镍和钴之间的协同效应,同时由于纳米锥的制造而降低了耐气泡性。另外,Ni-Co合金催化剂表现出良好的耐久性,并提供长期的电解而不会降低活性。这项研究为3-D电催化剂的原位生长提供了一种简便的制备方法,并为深入了解活性表面积,固有催化活性和催化性能之间的关系提供了深刻的见识。

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