Effect of DC magnetic field on some physical and catalytic properties of Fe- and Fe/Pt- nanoparticles synthesized by BH method

被引：0

作者：

Lefterova, E. D. ^{[1
]}

Stoyanova, A. E. ^{[1
]}

Kolev, H. ^{[2
]}

Tyuliev, G. ^{[2
]}

Paneva, D. ^{[2
]}

Borisov, G. R. ^{[1
]}

Dragieva, I. ^{[1
]}

机构：

[1] Bulgarian Acad Sci, Acad Evgeni Budevski Inst Electrochem & Energy Sy, BU-1113 Sofia, Bulgaria

[2] Bulgarian Acad Sci, Inst Catalysis, BU-1113 Sofia, Bulgaria

来源：

BULGARIAN CHEMICAL COMMUNICATIONS | 2015年 / 47卷 / 04期

关键词：

nanoparticles; borohydride (BH) reduction; PEM water electrolysis; XRD; XPS; CARBON-MONOXIDE; OXYGEN REDUCTION; IRON-OXIDES; FEROXYHITE; PARTICLES; POWDERS; SIZE;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The influence of dc magnetic field on some physical and catalytic properties of iron and platinum/iron nanoparticles is investigated. The nanoparticles are produced by a borohydride (BH) reduction process, as the dc magnetic field is applied during their synthesis. Structural differences between Fe powders are not observed. XRD and Mossbauer data show the presence of metallic iron and iron oxides (gamma-Fe2O3/Fe3O4). In the Pt-Fe powders fcc-Pt and iron oxide-hydroxides are identified. XPS investigations confirm the availability of the iron oxides and metallic Pt. Pt2+ is identified too. A comparison of the XRD and the XPS data suggests the formation of core (metal)/shell (oxide) structure of the nanoparticles. The samples untreated with magnetic field show better electrocatalytic activities in PEM water electrolysis compared to the treated nanoparticles. For Pt-Fe samples, in which the iron content is about 50%, the influence of the magnetic field is weak. The observed effect can be explained with the influence of the magnetic field on the capability of their self-organization.

引用

页码：1014 / 1021

页数：8

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