Ex-solution kinetics of nickel-ceria–doped strontium titanate perovskites

Mohamed Shahid; Shrihari Sankarasubramanian; Cheng He; Vijay K. Ramani; Suddhasatwa Basu

doi:10.1007/s11581-021-04016-x

Ex-solution kinetics of nickel-ceria–doped strontium titanate perovskites

Mohamed Shahid, Shrihari Sankarasubramanian, Cheng He, Vijay K. Ramani, Suddhasatwa Basu

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

6 Scopus citations

Abstract

Nickel ex-solution from La_0.3Sr_0.5Ni_xTi_1-xO_3-δ (LSN_xT_A-) perovskites containing different nickel fractions (x = 0.04 and 0.16) is studied using temperature-programmed reduction (TPR) and chemisorption. Non-isothermal reduction of nickel occurs through two steps as confirmed using two-parameter Sestak-Berggren model, where the nuclei of nickel are formed at low temperatures, which grow through at elevated temperatures. The kinetic triplets (E_a, f(α), and ln A) are estimated from the Sestak-Berggren model. The nucleation at elevated temperature is the rate-determining step whose activation energy (E_a) is reduced with higher nickel loadings in the perovskite. Doping ceria at the A-site in LC_0.04SN_0.16T_A- increases the dispersion of nickel, estimated using chemisorption studies in comparison to LSN_0.16T_A- perovskites. Physical characterization of sthe reduced perovskites using X-ray photo electron spectroscopy is used to correlate the ex-solution process with the Sestak-Berggren model.

Original language	English
Pages (from-to)	2527-2536
Number of pages	10
Journal	Ionics
Volume	27
Issue number	6
DOIs	https://doi.org/10.1007/s11581-021-04016-x
State	Published - Jun 2021

Keywords

Activation energy
Chemisorption
Ex-solution
Perovskite
Temperature-programmed reduction

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10.1007/s11581-021-04016-x

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title = "Ex-solution kinetics of nickel-ceria–doped strontium titanate perovskites",

abstract = "Nickel ex-solution from La0.3Sr0.5NixTi1-xO3-δ (LSNxTA-) perovskites containing different nickel fractions (x = 0.04 and 0.16) is studied using temperature-programmed reduction (TPR) and chemisorption. Non-isothermal reduction of nickel occurs through two steps as confirmed using two-parameter Sestak-Berggren model, where the nuclei of nickel are formed at low temperatures, which grow through at elevated temperatures. The kinetic triplets (Ea, f(α), and ln A) are estimated from the Sestak-Berggren model. The nucleation at elevated temperature is the rate-determining step whose activation energy (Ea) is reduced with higher nickel loadings in the perovskite. Doping ceria at the A-site in LC0.04SN0.16TA- increases the dispersion of nickel, estimated using chemisorption studies in comparison to LSN0.16TA- perovskites. Physical characterization of sthe reduced perovskites using X-ray photo electron spectroscopy is used to correlate the ex-solution process with the Sestak-Berggren model.",

keywords = "Activation energy, Chemisorption, Ex-solution, Perovskite, Temperature-programmed reduction",

author = "Mohamed Shahid and Shrihari Sankarasubramanian and Cheng He and Ramani, \{Vijay K.\} and Suddhasatwa Basu",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.",

year = "2021",

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doi = "10.1007/s11581-021-04016-x",

language = "English",

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AU - Shahid, Mohamed

AU - Sankarasubramanian, Shrihari

AU - He, Cheng

AU - Ramani, Vijay K.

AU - Basu, Suddhasatwa

PY - 2021/6

Y1 - 2021/6

N2 - Nickel ex-solution from La0.3Sr0.5NixTi1-xO3-δ (LSNxTA-) perovskites containing different nickel fractions (x = 0.04 and 0.16) is studied using temperature-programmed reduction (TPR) and chemisorption. Non-isothermal reduction of nickel occurs through two steps as confirmed using two-parameter Sestak-Berggren model, where the nuclei of nickel are formed at low temperatures, which grow through at elevated temperatures. The kinetic triplets (Ea, f(α), and ln A) are estimated from the Sestak-Berggren model. The nucleation at elevated temperature is the rate-determining step whose activation energy (Ea) is reduced with higher nickel loadings in the perovskite. Doping ceria at the A-site in LC0.04SN0.16TA- increases the dispersion of nickel, estimated using chemisorption studies in comparison to LSN0.16TA- perovskites. Physical characterization of sthe reduced perovskites using X-ray photo electron spectroscopy is used to correlate the ex-solution process with the Sestak-Berggren model.

AB - Nickel ex-solution from La0.3Sr0.5NixTi1-xO3-δ (LSNxTA-) perovskites containing different nickel fractions (x = 0.04 and 0.16) is studied using temperature-programmed reduction (TPR) and chemisorption. Non-isothermal reduction of nickel occurs through two steps as confirmed using two-parameter Sestak-Berggren model, where the nuclei of nickel are formed at low temperatures, which grow through at elevated temperatures. The kinetic triplets (Ea, f(α), and ln A) are estimated from the Sestak-Berggren model. The nucleation at elevated temperature is the rate-determining step whose activation energy (Ea) is reduced with higher nickel loadings in the perovskite. Doping ceria at the A-site in LC0.04SN0.16TA- increases the dispersion of nickel, estimated using chemisorption studies in comparison to LSN0.16TA- perovskites. Physical characterization of sthe reduced perovskites using X-ray photo electron spectroscopy is used to correlate the ex-solution process with the Sestak-Berggren model.

KW - Activation energy

KW - Chemisorption

KW - Ex-solution

KW - Perovskite

KW - Temperature-programmed reduction

UR - https://www.scopus.com/pages/publications/85103655737

U2 - 10.1007/s11581-021-04016-x

DO - 10.1007/s11581-021-04016-x

M3 - Article

AN - SCOPUS:85103655737

SN - 0947-7047

VL - 27

SP - 2527

EP - 2536

JO - Ionics

JF - Ionics

IS - 6

ER -

Ex-solution kinetics of nickel-ceria–doped strontium titanate perovskites

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