Magnetic and Electrocatalytic Properties of Nanoscale Cobalt Boride, Co3BClick to copy article linkArticle link copied!
- Anne-Marie ZieschangAnne-Marie ZieschangEduard-Zintl-Institute of Inorganic and Physical Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, 64287 Darmstadt, GermanyMore by Anne-Marie Zieschang
- Joshua D. BocarslyJoshua D. BocarslyDepartment of Chemistry & Biochemistry, Materials Department, and Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, California 93106, United StatesMore by Joshua D. Bocarsly
- Jona SchuchJona SchuchInstitute of Materials Science (Surface Science Division), Technische Universität Darmstadt, Jovanka-Bontschits-Str. 2, 64287 Darmstadt, GermanyMore by Jona Schuch
- Christina V. ReichelChristina V. ReichelEduard-Zintl-Institute of Inorganic and Physical Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, 64287 Darmstadt, GermanyMore by Christina V. Reichel
- Bernhard KaiserBernhard KaiserInstitute of Materials Science (Surface Science Division), Technische Universität Darmstadt, Jovanka-Bontschits-Str. 2, 64287 Darmstadt, GermanyMore by Bernhard Kaiser
- Wolfram JaegermannWolfram JaegermannInstitute of Materials Science (Surface Science Division), Technische Universität Darmstadt, Jovanka-Bontschits-Str. 2, 64287 Darmstadt, GermanyMore by Wolfram Jaegermann
- Ram Seshadri*Ram Seshadri*E-mail: [email protected]. (R.S.)Department of Chemistry & Biochemistry, Materials Department, and Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, California 93106, United StatesMore by Ram Seshadri
- Barbara Albert*Barbara Albert*E-mail: [email protected]. (B.A.)Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, 64287 Darmstadt, GermanyMore by Barbara Albert
Abstract

The use of low-temperature solution synthesis followed by a brief annealing step allows metastable single-phase Co3B nanoparticles to be obtained, with sizes ranging from 11 to 22 nm. The particles are ferromagnetic with a saturation magnetization of 91 A m2 kg–1 (corresponding to 1.02 μB/Co) and a coercive field of 0.14 T at 5 K, retaining the semihard magnetic properties of bulk Co3B. They display a magnetic blocking temperature of 695 K and a Curie temperature near 710 K, but the measurement of these high-temperature properties was complicated by decomposition of the particles during heating in the magnetometer. Additionally, the nanoparticles of Co3B were investigated as an electrocatalyst in the oxygen evolution reaction and showed a low onset potential of 1.55 V vs RHE. XPS measurements were performed before and after the electrocatalytic measurements to study the surface of the catalyst, to pinpoint what appear to be the active surface species.
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