Alloying effects on the hydrogen-storage capability of Pd–TM–H (TM=Cu, Au, Pt, Ir) systems
摘要:
Pressure-composition isotherms and the magnetic susceptibilities of Pd-TM-H (TM = Cu, Au, Pt, and Ir) systems were measured at ambient temperature, and the effects of alloying between Pd and transition metals on the hydrogen storage capability of these Pd-TM alloys were investigated by considering their electronic band structures. All of the magnetic susceptibilities for the Pd-TM-H systems decreased linearly with hydrogen uptake. For the Pd-Cu alloy, the magnetic susceptibility was nearly zero at the terminal composition of hydrogen in the plateau region obtained from the pressure-composition isotherm, and the terminal composition decreased with increasing Cu substitution. These results indicated that the hydrogen-storage capability was proportional to the amount of unoccupied d states in the electronic band structure of the Pd-Cu alloy. The Pd-Au-H system exhibited substantially the same behavior as the Pd-Cu-H system. For the Pd-Pt and Pd-Ir alloys, the magnetic susceptibility at the terminal composition of hydrogen in the plateau exhibited a finite positive value, indicating that the unoccupied d states in the Pd-Pt and Pd-Ir alloys were not filled when the maximum quantity of hydrogen was stored in the alloys. These finite magnetic susceptibilities at the terminal composition of hydrogen in the plateau region were explained by the structural modification of the unoccupied d states in the electronic band structures due to alloying. (C) 2014 Elsevier B.V. All rights reserved.
Synthesis and electrochemical study of Pt-based nanoporous materials
作者:Jingpeng Wang、Peter Holt-Hindle、Duncan MacDonald、Dan F. Thomas、Aicheng Chen
DOI:10.1016/j.electacta.2008.02.028
日期:2008.10
surface areas of these nanoporous Pt-based alloy catalysts are increased by over 68 (Pt–Pd), 69 (Pt–Ru) and 113 (Pt–Ir) fold compared to a polycrystalline Pt electrode. All these synthesized nanoporous electrodes exhibit superb electrocatalytic performance towards electrochemical oxidation of methanol and formic acid. Among the five nanoporous Pt-based electrodes, the Pt–Ir shows the highest peak current
The synthesis and electrochemicaldecontamination of platinum-palladiumnanoparticlesprepared by reduction with hydrazine of H 2 PtCl 6 and K 2 PdCl 4 in a water-in-oilmicroemulsion of water/poly(ethylene glycol)-dodecyl ether (BRIJ 30)/n-heptane is reported. X-ray photoelectron spectroscopy experiments were carried out to determine the composition of the nanoparticles obtained. Due to the presence
Room-temperature Fast Synthesis of Composition-adjustable Pt–Pd Alloy Sub-10-nm Nanoparticle Networks with Improved Electrocatalytic Activities
作者:Shuangxia Hou、You Xu、Yang Liu、Rui Xu、Bin Zhang
DOI:10.1246/cl.2012.546
日期:2012.5.5
Pt–Pd alloy nanoparticle networks (Pt–Pd NN) with adjustable composition have been fast synthesized through a one-step room-temperature coreduction method in a water/ethylene glycol (EG) system. It was found that the Pt–Pd NN exhibited enhanced electrocatalytic activity toward ethanol oxidation reaction (EOR) compared with Pt nanoparticle networks (Pt NN) and commercially available Pt black.
Rapid, General Synthesis of PdPt Bimetallic Alloy Nanosponges and Their Enhanced Catalytic Performance for Ethanol/Methanol Electrooxidation in an Alkaline Medium
作者:Chengzhou Zhu、Shaojun Guo、Shaojun Dong
DOI:10.1002/chem.201202909
日期:2013.1.14
this simple method has also been applied for the synthesis of AuPt, AuPd bimetallic, and AuPtPd trimetallic alloy nanosponges. The as‐synthesized three‐dimensional bimetallic/trimetallic alloy nanosponges, because of their convenient preparation, well‐defined sponge‐like network, large‐scale production, and high electrocatalyticperformance for ethanol/methanol electrooxidation, may find promising potential
<scp>l</scp>-Lysine-assisted fabrication of Pd<sub>x</sub>Pt<sub>1−x</sub>/Ni(OH)<sub>2</sub> (0 ≤ x ≤ 1) hybrids with composition-dependent catalytic properties
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