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Journal Article 2

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2017 2

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EXAFS 1

X-ray absorption spectroscopy 1

X-ray adsorption near edge structure (XANES) 1

X-ray diffraction (XRD) 1

XANES 1

core shell 1

extended X-ray absorption fine structure (EXAFS) 1

nano-suspension flow battery 1

nanocatalysts 1

scanning electronic microscopy (SEM) 1

β-Ni(OH)₂ 1

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Design of efficient Pt-based electrocatalysts through characterization by X-ray absorption spectroscopy

Nebojsa S. MARINKOVIC, Kotaro SASAKI, Radoslav R. ADZIC

Frontiers in Energy 2017, Volume 11, Issue 3, Pages 236-244 doi: 10.1007/s11708-017-0487-1

Abstract: A method is described to determine the internal structure of electrocatalyst nanoparticles by X-ray absorption spectroscopy (XAS). The nondestructive spectroscopic technique typically utilizing synchrotron radiation as the source measures changes in the X-ray absorption coefficient as a function of energy. The bulk technique has found its use for materials characterization in all scientific areas, including nanomaterials. The analysis of the internal structure of nanoparticles reveals interatomic distances and coordination numbers for each element, and their values and mutual relations indicate whether the elements form a homogeneous or heterogeneous mixture. The core-shell heterogeneous structure in which certain elements are predominantly located in the core, and others form the encapsulating shell is of particular importance in catalysis and electrocatalysis because it may reduce the amount of precious metals in nanoparticles by replacing the atoms in the core of nanoparticles with more abundant and cheaper alternatives. The examples of nanoparticle structures designed in the laboratory and the approach to model efficient catalysts through systematic analysis of XAS data in electrochemical systems consisting of two and three metals are also demonstrated.

Keywords： X-ray absorption spectroscopy EXAFS XANES nanocatalysts core shell

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β-Nickel hydroxide cathode material for nano-suspension redox flow batteries

Yue LI, Cheng HE, Elena V. TIMOFEEVA, Yujia DING, Javier PARRONDO, Carlo SEGRE, Vijay RAMANI

Frontiers in Energy 2017, Volume 11, Issue 3, Pages 401-409 doi: 10.1007/s11708-017-0496-0

Abstract: spectroscopy to obtain the shift in the oxidation state of Ni (X-ray adsorption near edge structure, XANESXANES results indicated that the electrode in the discharged state was a mixture of phases because the

Keywords： scanning electronic microscopy (SEM) X-ray diffraction (XRD) X-ray adsorption near edge structure (XANES