Heterostructured V‐Doped Ni
<sub>2</sub>
P/Ni
<sub>12</sub>
P
<sub>5</sub>
Electrocatalysts for Hydrogen Evolution in Anion Exchange Membrane Water Electrolyzers
active sites in V–Ni2P/Ni12P5 due to the Vdoping and heterointerfaces effect. The strong coupling between Ni2P and Ni12P5 at the interface leads to an increased electron density at interfacial Ni sites while depleting at P sites, with V-doping further promoting the electron accumulation at Ni sites. This is accompanied by the change of active sites from the anionic P sites to the interfacial Ni–V bridge
通过优化氢中间体吸附来调节催化剂活性位点的电子结构和本征活性对于增强碱性介质中的析氢反应 (HER) 至关重要。在此,通过水热处理和可控磷化工艺制备了异质结构的V掺杂Ni 2 P/Ni 12 P 5 (V-Ni 2 P/Ni 12 P 5 )电催化剂。与纯相 V-Ni 2 P 相比,原位/非原位表征和理论计算揭示了 V-Ni 2 P/Ni 12 P 5中电子和活性位点的重新分布由于 V 掺杂和异质界面效应。Ni 2 P 和 Ni 12 P 5在界面处的强耦合导致界面 Ni 位点的电子密度增加,而 P 位点耗尽,V 掺杂进一步促进了 Ni 位点的电子积累。这伴随着活性位点从阴离子 P 位点到 V-Ni 2 P/Ni 12 P 5中的界面 Ni-V 桥位点的变化。得益于界面电子结构、增加的活性位点数量和优化的 H 吸附能量,V-Ni 2 P/Ni 12 P 5的过电位为 62 mV,可提供 10
Structural, thermodynamic, and electrochemical properties of TixZr1−x(VNiCrMnCoAl)2 C14 Laves phase alloys
作者:K. Young、M.A. Fetcenko、F. Li、T. Ouchi
DOI:10.1016/j.jallcom.2007.09.096
日期:2008.9
Abstract Variations in structural, thermodynamic, and electrochemical properties due to partial replacement of Zr by Ti in stoichiometricTi x Zr 1− x (VNiCrMnCoAl) 2 AB 2 alloys, have been studied. In particular, these properties are evaluated to determine the alloys’ potential as a negative electrode material for highenergy density nickel metal hydride batteries. Alloys having an x value of from
摘要 已经研究了由于在化学计量的 Ti x Zr 1- x (VNiCrMnCoAl) 2 AB 2 合金中 Zr 被 Ti 部分取代而导致的结构、热力学和电化学性能的变化。特别是,评估这些特性以确定合金作为高能量密度镍金属氢化物电池负极材料的潜力。x 值为 0.49 至 0.61 的合金以 C14 Laves 相晶体结构为主。随着Ti含量的增加,晶格常数a和c呈非线性减小,氢化物形成热的绝对值减小,总气相存储容量减小,高倍率放电能力增大。然而,电化学容量保持相对恒定。
Phase equilibria in the V-Ni-Sb system
作者:Ya. F. Lomnytska、O. P. Pavliv
DOI:10.1134/s0020168507060106
日期:2007.6
Phase relations in the V-Ni-Sb system have been studied by x-ray diffraction, and the 1070-K section of its phase diagram has been constructed in the region 0-67 at % Sb. The VSb phase (NiAs structure) is shown to have a homogeneity range: V1.04-1.00Sb0.96-1.00 (a = 0.4274(1)-0.4266(2) nm, c = 0.5464(2)-0.5448(4) nm). The binary antimonides with the NiAs structure dissolve the third component. V solubility in NiSb is within 3.5 at %. Ni dissolution in VSb is accompanied by partial Ni substitution for V and Ni incorporation into position 2d of space group P6(3)/mmc, up to the composition V0.84Ni0.32Sb0.84 (a = 0.42187(6) nm, c = 0.54000(9) nm).
Free volume distribution and structural inhomogeneity in Ni50V50 amorphous alloy
作者:K. Itoh、Y. Yoshioka、E.R. Barney、A.C. Hannon
DOI:10.1016/j.jallcom.2018.08.148
日期:2019.1
The structure of Ni50V50 amorphous alloy was investigated by using neutron, X-ray diffraction and reverse Monte Carlo (RMC) modelling. The RMC configuration was decomposed into polyhedral holes whose faces are all triangles consisting of chemical bonds. Free volumes in the respective polyhedral holes were evaluated with reference to the packing efficiency of Ni-V metastable BCC phase. The tetrahedral holes, which account for about 70% of the whole space, are regarded as densely packed units because the average packing efficiency of them is approximately equal to that of the corresponding crystal phase. On the other hand, various types of polyhedral holes, which have a certain free volume, are observed and some of them are connected with each other. The densely packed coordination polyhedra consisting only of tetrahedral holes tend to be clustered. (C) 2018 Elsevier B.V. All rights reserved.