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6. Síntesis y caracterización de nanopartículas calcogenuras del sistema Cu-Zn-Sn-Ge

Author

Cancino Gordillo, Francisco Enrique and Pal, Umapada

Subjects
CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA, Nanocristales--Síntesis, Materiales nanoestructurados, Óptica cristalográfica, Películas delgadas, Materiales nanocompuestos, Semiconductores
Abstract

"Este trabajo concierne a la síntesis y caracterización estructural y óptica de nano-/microestructuras calcogenuras del sistema Cu-Zn-Sn-Ge. Se sintetizaron nano-/microestructuras de Cu2ZnSn1-xGexSe4 con diferentes valores de x utilizando el método hidrotermal/solvotermal con GeO2 como precursor de Ge y Se elemental y cloruros/acetatos de los elementos Zn, Cu y Sn. Por otra parte, se fabricaron nanoestructuras de Cu2ZnSn1-xGexS4 con diferentes contenidos de Ge (diferentes valores de x) por el método hidrotermal."

Published
2018

7. Performance of asymmetric supercapacitor fabricated with perovskite‐type Sr2+‐incorporated LaMnO3 (La0.7Sr0.3MnO3) nanostructures in neutral 1M Na2SO4 aqueous electrolyte

Author

Roy, Atanu, Cancino‐Gordillo, Francisco Enrique, Saha, Samik, Pal, Umapada, and Das, Sachindranath

Subjects
*SUPERCAPACITOR electrodes, *SUPERCAPACITOR performance, *COMPOSITE materials, *ENERGY storage, *ELECTROCHEMICAL electrodes, *ELECTRODE performance, *AQUEOUS electrolytes
Abstract

Summary: Strontium (Sr) incorporated LaMnO3 (La0.7Sr0.3MnO3) nanoparticles have been synthesized by ball‐milling‐assisted solid‐state reaction to study their performance as electrode material for energy storage applications. The La0.7Sr0.3MnO3 nanoparticles exhibit superior electrochemical performance in neutral aqueous electrolyte (1 M Na2SO4) in comparison to LaMnO3 and SrMnO3 nanoparticles. This neutral electrolyte provides relatively higher ionic conductivity and viscosity compared to the ionic liquids and a wider potential window compared to the alkaline electrolytes. Electrochemical study of the electrodes prepared using La0.7Sr0.3MnO3 nanoparticles reveals pseudocapacitive behaviors with fast reversible Faradaic charge storage, which plays a key role in charge storage. The composite materials exhibit highest specific capacitance of 393.5 F g−1 at a scan rate of 2 mV s−1. Asymmetric supercapacitors fabricated using La0.7Sr0.3MnO3 nanoparticle and activated carbon operates over a wide potential window of 1.8 V, and it reveals high specific capacitance (197 F g−1) as well as high capacitive retention (87%) even after 4000 charge–discharge cycles. [ABSTRACT FROM AUTHOR]

Published
2021
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