successfully applied as a highlyefficient catalyst for the rapid and complete decomposition of hydroushydrazine (a promising hydrogen storage/generation material) for hydrogen generation at a mild temperature. The surfactant/support-free nanoparticles possess good dispersion and small particle size. Moreover, upon the incorporation of Mo and Fe, the catalytic activity and hydrogen selectivity of the present
have been synthesized on graphene sheets via a facile chemical reduction route, which show the highest catalytic activity reported to date for noble-metal-free catalysts for hydrogenevolution from the hydrolysis of ammoniaborane with a turnover frequency value as high as 66.7 mol H2 (mol metal min)−1.
已通过一种简便的化学还原途径在石墨烯片上合成了用Mo掺杂剂改性的Ni纳米颗粒,该纳米颗粒显示了迄今为止报道的无贵金属催化剂从氨硼烷水解产生氢气的最高催化活性,其周转频率值为高达66.7 mol H 2(最小金属mol)-1。
Electrochemical performance of porous Ni-alloy electrodes for hydrogen evolution reaction from seawater electrolysis
The hydrogen evolution reaction in seawater is investigated using porous Ni–Cr–Fe, Ni–Fe–Mo, Ni–Fe–C and Ni–Ti electrodes, prepared by elemental powder reactive synthesis methods.
Explosive anisotropic grain growth of delta‐NiMo by solid‐state diffusion
作者:T. C. Chou、T. G. Nieh
DOI:10.1063/1.104794
日期:1991.6.10
Anomalous, anisotropicgraingrowth has been observed in delta(δ)‐NiMo intermetallic compound during the annealings of Mo/Ni thin‐film diffusion couples at 700 and 800 °C. Two layered microstructures showing median‐sized, equiaxed grains and large columnar single crystalline grains were generated. The growth direction of the columnar grains was parallel to the direction of Ni diffusion flux. Electron
在 700 和 800 °C 对 Mo/Ni 薄膜扩散偶进行退火期间,在 delta(δ)-NiMo 金属间化合物中观察到异常的各向异性晶粒生长。产生了显示中等尺寸的等轴晶粒和大柱状单晶晶粒的两层显微组织。柱状晶粒的生长方向与Ni扩散通量的方向平行。电子衍射表明中值晶粒和柱状晶粒均为δ-NiMo。δ-NiMo 的组成被确定为 Ni48-Mo52 (at.%)。根据反应形成的δ-NiMo的厚度,测得表观互扩散系数约为10-10 cm2/s,比文献数据大4-5个数量级。Ni-Mo 中增强的扩散速率,并在扩散混合过程中 Ni 和 Mo 之间的放热反应的基础上讨论了 δ-NiMo 化合物的异常各向异性晶粒生长。δ-NiMo的形成焓被计算并证明......
Carbothermic reduction of copper, nickel, and cobalt oxides and molybdates
作者:N. V. Lebukhova、N. F. Karpovich
DOI:10.1134/s0020168508080207
日期:2008.8
The carbothermic reduction of NiO, CoO, CuO, MoO3, and the MMoO4 (M = Ni, Co, Cu) molybdates has been studied by thermogravimetry. The results demonstrate that the reactivity of the molybdates with solid carbon, the sequence of reduction reactions, and the composition of reaction intermediates are determined by the reactivity of the constituent oxides, which decreases in the order CuO > MoO3 > NiO > CoO. The reaction intermediates in the reduction of CuMoO4 are Cu6Mo5O18 and Cu2Mo3O10, and those in the reduction of CoMoO4 are Co2Mo3O8 and CoMoO3. NiMoO4 is reduced without oxide intermediates. The reactions of CuMoO4 and NiMoO4 with solid carbon lead to selective reduction of the molybdates to metals (Cu or Ni) and molybdenum oxides (MoO2 and MoO3-x). In the reactions of NiMoO4 and CoMoO4 with CO gas, the metals are formed at comparable rates, which favors the formation of metal solid solutions, intermetallic phases, and mixed carbides.