Extended X-ray Absorption Fine Structure and X-ray Diffraction Examination of Sputtered Nickel Carbon Binary Thin Films for Fuel Cell Applications

被引：9

作者：

Ingham, Bridget ^{[1
,2
]}

Gaston, Nicola ^{[1
,2
]}

Fahy, Kieran ^{[3
]}

Chin, Xiao Yao ^{[3
]}

Dotzler, Christian J. ^{[1
]}

Rees, Eric ^{[3
]}

Haslam, Gareth ^{[3
]}

Barber, Zoe H. ^{[3
]}

Burstein, G. Timothy ^{[3
]}

Ryan, Mary P. ^{[4
,5
]}

机构：

[1] Ind Res Ltd, Lower Hutt 5011, New Zealand

[2] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Sch Chem & Phys Sci, Wellington 6140, New Zealand

[3] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[4] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[5] Univ London Imperial Coll Sci Technol & Med, London Ctr Nanotechnol, London SW7 2AZ, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; CARBIDE-MODIFIED MO(110); WAVE BASIS-SET; TUNGSTEN CARBIDE; POTENTIAL APPLICATION; METHANOL ELECTROOXIDATION; ELECTROCATALYTIC ACTIVITY; SURFACE REACTIVITIES; REACTION PATHWAYS;

D O I：

10.1021/jp207308g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Extended X-ray absorption fine structure (EXAFS) and X-ray diffraction (XRD) are used to study the structure of sputtered binary nickel carbon alloy films (5-44 atom % Ni) for use as potential electrocatalysts in acidic solutions. Three compositional regions are identified: "low" (5 atom % Ni), where the structure consists mainly of isolated Ni atoms or dimers in a carbon matrix; "medium" (11-24 atom % Ni), where the Ni-Ni nearest-neighbor coordination is increased but there is little longer-range order; and "high" (35-44 atom % Ni), where crystalline Ni3C is formed. This indicates a threshold concentration of Ni of between 25 and 35 at% before Ni3C starts to form.

引用

页码：6159 / 6165

页数：7

共 65 条

[1] Oxidation and dissolution of tungsten carbide powder in water [J].