TY - JOUR
T1 - Procesamiento mecanoquímico de IrO2-Ta2O5
T2 - Una ruta alternativa para sintetizar Ir y solución sólida Ir(Ta)O2
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
UR - http://www.scopus.com/inward/record.url?scp=85081590828&partnerID=8YFLogxK
U2 - 10.1016/j.bsecv.2020.01.010
DO - 10.1016/j.bsecv.2020.01.010
M3 - Article
AN - SCOPUS:85081590828
SN - 0366-3175
VL - 60
SP - 109
EP - 118
JO - Boletin de la Sociedad Espanola de Ceramica y Vidrio
JF - Boletin de la Sociedad Espanola de Ceramica y Vidrio
IS - 2
ER -