Mechanochemical processing of IrO2-Ta2O5: An alternative route for synthesizing Ir and Ir(Ta)O2solid solution

Danny Guzmán; Gabriel Dubray; Claudio Aguilar; Paula Rojas; Alexis Guzmán; Álvaro Soliz; Rossana Sepúlveda; Rodrigo Espinoza

doi:10.1016/j.bsecv.2020.01.010

Mechanochemical processing of IrO₂-Ta₂O₅: An alternative route for synthesizing Ir and Ir(Ta)O₂solid solution

Translated title of the contribution: Mechanochemical processing of IrO₂-Ta₂O₅: An alternative route for synthesizing Ir and Ir(Ta)O₂solid solution

Danny Guzmán, Gabriel Dubray, Claudio Aguilar, Paula Rojas, Alexis Guzmán, Álvaro Soliz, Rossana Sepúlveda, Rodrigo Espinoza

Research output: Contribution to journal › Article › peer-review

Abstract

This paper describes a study exploring milling and subsequent heat treatments of pure IrO2 and Ta2O5 powders. Reactants were milled under Ar atmosphere in a SPEX 8000D mill, with structural, morphological, and compositional characterizations (during milling and after subsequent heat treatments) by X-ray diffraction, energy-dispersive spectroscopy, and transmission electron microscopy. Electrochemical stability of powders was evaluated by open circuit potential (OCP). Results showed that the mechanical energy transferred during this process induces a reaction between IrO2 and Ta2O5, forming metallic Ir and Ir(Ta)O2 saturated solid solution. The study additionally shows that this reaction can be thermally induced with previous mechanical activation of reactants. Electrochemical evaluations of milled powders immersed in H2SO4 solution revealed that OCP shifts negatively with increasing milling time, approaching that of pure Ir at 15 h milling.

Translated title of the contribution	Mechanochemical processing of IrO₂-Ta₂O₅: An alternative route for synthesizing Ir and Ir(Ta)O₂solid solution
Original language	English
Pages (from-to)	109-118
Number of pages	10
Journal	Boletin de la Sociedad Espanola de Ceramica y Vidrio
Volume	60
Issue number	2
DOIs	https://doi.org/10.1016/j.bsecv.2020.01.010
State	Published - Mar 2021
Externally published	Yes

Keywords

Catalytic material
Mechanochemical synthesis
Oxides
Thermogravimetry

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10.1016/j.bsecv.2020.01.010

Cite this

@article{28b5f59dd63d4e0cb0f2a5fc273f9676,

title = "Mechanochemical processing of IrO2-Ta2O5: An alternative route for synthesizing Ir and Ir(Ta)O2solid solution",

abstract = "This paper describes a study exploring milling and subsequent heat treatments of pure IrO2 and Ta2O5 powders. Reactants were milled under Ar atmosphere in a SPEX 8000D mill, with structural, morphological, and compositional characterizations (during milling and after subsequent heat treatments) by X-ray diffraction, energy-dispersive spectroscopy, and transmission electron microscopy. Electrochemical stability of powders was evaluated by open circuit potential (OCP). Results showed that the mechanical energy transferred during this process induces a reaction between IrO2 and Ta2O5, forming metallic Ir and Ir(Ta)O2 saturated solid solution. The study additionally shows that this reaction can be thermally induced with previous mechanical activation of reactants. Electrochemical evaluations of milled powders immersed in H2SO4 solution revealed that OCP shifts negatively with increasing milling time, approaching that of pure Ir at 15 h milling.",

keywords = "Catalytic material, Mechanochemical synthesis, Oxides, Thermogravimetry",

author = "Danny Guzm{\'a}n and Gabriel Dubray and Claudio Aguilar and Paula Rojas and Alexis Guzm{\'a}n and {\'A}lvaro Soliz and Rossana Sep{\'u}lveda and Rodrigo Espinoza",

note = "Funding Information: This study was financially supported by FONDECYT [Project No. 1151204]. The authors wish to thank the Metallurgy Department of University of Atacama for the XRD, SEM, and DSC analyses [Projects EQM 130125, EQUV 003, and EQUR 16002]. Additionally, Gabriel Dubray thanks to the University of Atacama for the postgraduate fellowship. Publisher Copyright: {\textcopyright} 2020 SECV.",

year = "2021",

month = mar,

doi = "10.1016/j.bsecv.2020.01.010",

language = "English",

volume = "60",

pages = "109--118",

journal = "Boletin de la Sociedad Espanola de Ceramica y Vidrio",

issn = "0366-3175",

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number = "2",

}

TY - JOUR

T1 - Mechanochemical processing of IrO2-Ta2O5

T2 - An alternative route for synthesizing Ir and Ir(Ta)O2solid solution

AU - Guzmán, Danny

AU - Dubray, Gabriel

AU - Aguilar, Claudio

AU - Rojas, Paula

AU - Guzmán, Alexis

AU - Soliz, Álvaro

AU - Sepúlveda, Rossana

AU - Espinoza, Rodrigo

N1 - Funding Information: This study was financially supported by FONDECYT [Project No. 1151204]. The authors wish to thank the Metallurgy Department of University of Atacama for the XRD, SEM, and DSC analyses [Projects EQM 130125, EQUV 003, and EQUR 16002]. Additionally, Gabriel Dubray thanks to the University of Atacama for the postgraduate fellowship. Publisher Copyright: © 2020 SECV.

PY - 2021/3

Y1 - 2021/3

N2 - This paper describes a study exploring milling and subsequent heat treatments of pure IrO2 and Ta2O5 powders. Reactants were milled under Ar atmosphere in a SPEX 8000D mill, with structural, morphological, and compositional characterizations (during milling and after subsequent heat treatments) by X-ray diffraction, energy-dispersive spectroscopy, and transmission electron microscopy. Electrochemical stability of powders was evaluated by open circuit potential (OCP). Results showed that the mechanical energy transferred during this process induces a reaction between IrO2 and Ta2O5, forming metallic Ir and Ir(Ta)O2 saturated solid solution. The study additionally shows that this reaction can be thermally induced with previous mechanical activation of reactants. Electrochemical evaluations of milled powders immersed in H2SO4 solution revealed that OCP shifts negatively with increasing milling time, approaching that of pure Ir at 15 h milling.

AB - This paper describes a study exploring milling and subsequent heat treatments of pure IrO2 and Ta2O5 powders. Reactants were milled under Ar atmosphere in a SPEX 8000D mill, with structural, morphological, and compositional characterizations (during milling and after subsequent heat treatments) by X-ray diffraction, energy-dispersive spectroscopy, and transmission electron microscopy. Electrochemical stability of powders was evaluated by open circuit potential (OCP). Results showed that the mechanical energy transferred during this process induces a reaction between IrO2 and Ta2O5, forming metallic Ir and Ir(Ta)O2 saturated solid solution. The study additionally shows that this reaction can be thermally induced with previous mechanical activation of reactants. Electrochemical evaluations of milled powders immersed in H2SO4 solution revealed that OCP shifts negatively with increasing milling time, approaching that of pure Ir at 15 h milling.

KW - Catalytic material

KW - Mechanochemical synthesis

KW - Oxides

KW - Thermogravimetry

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