Complete Conversion of Hydrous Hydrazine to Hydrogen at Room Temperature for Chemical Hydrogen Storage
摘要:
A synergic effect of Rh and Ni in the bimetallic Rh4Ni nanocatalyst (Rh/Ni ratio = 4:1) makes it possible to achieve a 100% selectivity for hydrogen generation by complete decomposition of hydrous hydrazine at room temperature. The Rh,Ni nanocatalysts with a particle size of similar to 3 nm were prepared by alloying Rh and Ni using a coreduction process in the presence of hexadecyltrimethyl ammonium bromide (CTAB).
Complete Conversion of Hydrous Hydrazine to Hydrogen at Room Temperature for Chemical Hydrogen Storage
摘要:
A synergic effect of Rh and Ni in the bimetallic Rh4Ni nanocatalyst (Rh/Ni ratio = 4:1) makes it possible to achieve a 100% selectivity for hydrogen generation by complete decomposition of hydrous hydrazine at room temperature. The Rh,Ni nanocatalysts with a particle size of similar to 3 nm were prepared by alloying Rh and Ni using a coreduction process in the presence of hexadecyltrimethyl ammonium bromide (CTAB).
Rhodium–nickel bimetallic nanocatalysts: high performance of room-temperature hydrogenation
作者:Haohong Duan、Dingsheng Wang、Yuan Kou、Yadong Li
DOI:10.1039/c2cc37668g
日期:——
Rhodiumânickel bimetallic nanocrystals were fabricated with high activity in hydrogenation of olefins, nitroarenes and arenes at room temperature, indicating that bimetallic nanocrystals of noble and non-noble metals represent a novel kind of nanocatalyst.
The synergistic effect of Rh–Ni catalysts on the highly-efficient dehydrogenation of aqueous hydrazine borane for chemical hydrogen storage
作者:Di-Chang Zhong、Kengo Aranishi、Ashish Kumar Singh、Umit B. Demirci、Qiang Xu
DOI:10.1039/c2cc36407g
日期:——
An Rh4Ni alloy nanocatalyst exhibits highly-efficient performance in dehydrogenation of aqueous hydrazine borane. The hydrogen selectivity reaches almost 100%. More interestingly, catalyzed by the Rh4Ni nanocatalyst, the dehydrogenation of aqueous hydrazine borane is not simply divided into two steps.
The Curie temperature and the effect of pressure of Ni-based alloys (Ni-Cu, -Pd, -Pt and -Rh)
作者:H. Kadomatsu、H. Fujiwara
DOI:10.1016/0038-1098(79)91050-0
日期:1979.1
Abstract The pressureeffect on the Curietemperature T c , Δ T c /Δ p , of Ni-basedalloy systems (Ni-Cu, -Pd, -Pt and -Rh) was measured over the entire ferromagnetic composition range. It was found that the trend of the variation of Δ T c /Δ p with composition exactly reflects the variation of T c , leading to a systematic discussion in terms of alloy heterogeneity.
摘要 在整个铁磁成分范围内测量了压力对 Ni 基合金系统(Ni-Cu、-Pd、-Pt 和 -Rh)的居里温度 T c 、ΔT c /Δ p 的影响。发现Δ T c /Δ p 随成分的变化趋势准确地反映了T c 的变化,从而在合金非均质性方面进行了系统的讨论。
A Series of NiM (M = Ru, Rh, and Pd) Bimetallic Catalysts for Effective Lignin Hydrogenolysis in Water
作者:Jiaguang Zhang、Jason Teo、Xi Chen、Hiroyuki Asakura、Tsunehiro Tanaka、Kentaro Teramura、Ning Yan
DOI:10.1021/cs401199f
日期:2014.5.2
In this paper, NiRu, NiRh, and NiPd catalysts were synthesized and evaluated in the hydrogenolysis of lignin C O bonds, which is proved to be superior over single-component catalysts. The optimized NiRu catalyst contains 85% Ni and 15% Ru, composed of Ni surface-enriched, Ru Ni atomically mixed, ultrasmall nanoparticles. The Ni85Ru15 catalyst showed high activity under low temperature (100 degrees C), low H-2 pressure (1 bar) in beta-O-4 type C-Obond hydrogenolysis. It also exhibited significantly higher activity over Ni and Ru catalysts in the direct conversion of lignin into monomeric aromatic chemicals. Mechanistic investigation indicates that the synergistic effect of NiRu can be attributed to three factors: (1) increased fraction of surface atoms (compared with Ni), (2) enhanced H-2 and substrate activation (compared with Ni), and (3) inhibited benzene ring hydrogenation (compared with Ru). Similarly, NiRh and NiPd catalysts were more active and selective than their singlecomponent counterparts in the hydrogenolysis of lignin model compounds and real lignin.
NiRh nanosponges with highly efficient electrocatalytic performance for hydrogen evolution reaction
The development of Ni-based nanoalloys has been extensively explored due to their low cost, high activity, and durability in the hydrogen evolution reaction (HER). Structural design of Ni-based nanoalloys is a promising approach to attain excellent electrocatalytic activity as well as stability of these catalysts. This study reports a facile method to prepare NixRhy nanosponges while using NaBH4 as a reducing agent without any surfactant. The ratio of Ni and Rh has been changed to obtain various NixRhy electrocatalysts (Ni, Ni3Rh1, Ni1Rh1, Nt(1)Rh(3), and Rh), respectively. Among the prepared catalysts, Ni1Rh3 electrocatalyst exhibits a high electrocatalytic activity with an overpotential of 48 mV at a current density of -10 mA cm(-2) and a superior stability even after 2000 cycles of CV in 0.5 MH2SO4 electrolyte. In addition, the Ni1Rh3 electrocatalyst shows good electrocatalytic activity in 1.0 M KOH electrolyte compared to commercial Pt/C (20 wt% of Pt) (c-Pt/C). Moreover, the overall water splitting system of the Ni1Rh3 cathode and the commercial RuO2 anode is evaluated, not only exhibiting excellent performance with a potential of 1.52 Vat a current density of 10 mA cm(-2), but also proving very stable operation for over 100,000 s in 1.0 M KOH electrolyte. (C) 2019 Elsevier B.V. All rights reserved.