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Fast Surface Oxygen Release Kinetics Accelerate Nanoparticle Exsolution in Perovskite Oxides

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.2c10256· OSTI ID:1924197
Exsolution is a recent advancement for fabricating oxide-supported metal nanoparticle catalysts via phase precipitation out of a host oxide. A fundamental understanding and control of the exsolution kinetics are needed to engineer exsolved nanoparticles to obtain higher catalytic activity toward clean energy and fuel conversion. Since oxygen release via oxygen vacancy formation in the host oxide is behind oxide reduction and metal exsolution, we hypothesize that the kinetics of metal exsolution should depend on the kinetics of oxygen release, in addition to the kinetics of metal cation diffusion. In this report we probe the surface exsolution kinetics both experimentally and theoretically using thin-film perovskite SrTi0.65Fe0.35O3 (STF) as a model system. We quantitatively demonstrated that in this system the surface oxygen release governs the metal nanoparticle exsolution kinetics. As a result, by increasing the oxygen release rate in STF, either by reducing the sample thickness or by increasing the surface reactivity, one can effectively accelerate the Fe0 exsolution kinetics. Fast oxygen release kinetics in STF not only shortened the prereduction time prior to the exsolution onset, but also increased the total quantity of exsolved Fe0 over time, which agrees well with the predictions from our analytical kinetic modeling. The consistency between the results obtained from in situ experiments and analytical modeling provides a predictive capability for tailoring exsolution, and highlights the importance of engineering host oxide surface oxygen release kinetics in designing exsolved nanocatalysts.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1924197
Report Number(s):
BNL-224042-2023-JAAM
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 3 Vol. 145; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (66)

Exsolution Synthesis of Nanocomposite Perovskites with Tunable Electrical and Magnetic Properties journal November 2021
In Situ Method Correlating Raman Vibrational Characteristics to Chemical Expansion via Oxygen Nonstoichiometry of Perovskite Thin Films journal June 2019
In Situ Investigation of Reversible Exsolution/Dissolution of CoFe Alloy Nanoparticles in a Co‐Doped Sr 2 Fe 1.5 Mo 0.5 O 6− δ Cathode for CO 2 Electrolysis journal December 2019
Correlating Surface Crystal Orientation and Gas Kinetics in Perovskite Oxide Electrodes journal April 2021
A New Durable Surface Nanoparticles‐Modified Perovskite Cathode for Protonic Ceramic Fuel Cells from Selective Cation Exsolution under Oxidizing Atmosphere journal January 2022
In Situ Optical Absorption Studies of Point Defect Kinetics and Thermodynamics in Oxide Thin Films journal June 2019
Active Tuning of Optical Constants in the Visible–UV: Praseodymium‐Doped Ceria—a Model Mixed Ionic–Electronic Conductor journal January 2021
A New Model Describing Solid Oxide Fuel Cell Cathode Kinetics: Model Thin Film SrTi1-xFexO3-δ Mixed Conducting Oxides-a Case Study journal September 2011
Enhancing Electrochemical Water-Splitting Kinetics by Polarization-Driven Formation of Near-Surface Iron(0): An In Situ XPS Study on Perovskite-Type Electrodes journal December 2014
An Optical In-Situ Method to Study Redox-Kinetics in SrTiO3 journal September 1993
Countering the Segregation of Transition-Metal Ions in LiMn1/3Co1/3Ni1/3O2Cathode for Ultralong Life and High-Energy Li-Ion Batteries journal July 2016
Emergence and Future of Exsolved Materials journal March 2021
Effects of exsolution on the stability and morphology of Ni nanoparticles on BZY thin films journal April 2022
Systematic and collaborative approach to problem solving using X-ray photoelectron spectroscopy journal September 2021
Surface segregation in Cr-Mn-Fe-Co-Ni high entropy alloys journal December 2020
From material design to mechanism study: Nanoscale Ni exsolution on a highly active A-site deficient anode material for solid oxide fuel cells journal September 2016
Oxygen tracer diffusion and surface exchange kinetics in La0.6Sr0.4CoO3−δ journal June 2010
Effects of crystallographic orientation on the oxygen exchange rate of La0.7Sr0.3MnO3 thin films journal July 2011
Atomic and subnanometer resolution in ambient conditions by atomic force microscopy journal March 2009
Hybrid DFT calculations of the atomic and electronic structure for ABO3 perovskite (001) surfaces journal January 2005
Synthesis and catalytic properties of metal nanoparticles: Size, shape, support, composition, and oxidation state effects journal April 2010
Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides journal June 2021
Perspective on the Relationship between the Acidity of Perovskite Oxides and Their Oxygen Surface Exchange Kinetics journal January 2022
Strain-Dependent Surface Defect Equilibria of Mixed Ionic-Electronic Conducting Perovskites journal May 2022
How To Get Mechanistic Information from Partial Pressure-Dependent Current–Voltage Measurements of Oxygen Exchange on Mixed Conducting Electrodes journal June 2018
Ambient Pressure XPS Study of Mixed Conducting Perovskite-Type SOFC Cathode and Anode Materials under Well-Defined Electrochemical Polarization journal January 2016
Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La 2 NiO 4+δ journal August 2016
Water-Induced Decoupling of Tracer and Electrochemical Oxygen Exchange Kinetics on Mixed Conducting Electrodes journal June 2016
Metal Nanoparticle Exsolution on a Perovskite Stannate Support with High Electrical Conductivity journal April 2020
Exsolution-Driven Surface Transformation in the Host Oxide journal June 2022
Exceptional Tunability over Size and Density of Spontaneously Formed Nanoparticles via Nucleation Dynamics journal April 2020
Simultaneous Electrical, Electrochemical, and Optical Relaxation Measurements of Oxygen Surface Exchange Coefficients: Sr(Ti,Fe)O 3−d Film Crystallization Case Study journal October 2020
In Situ Observation of Nanoparticle Exsolution from Perovskite Oxides: From Atomic Scale Mechanistic Insight to Nanostructure Tailoring journal October 2019
Electronic Structure, Defect Chemistry, and Transport Properties of SrTi 1 - x Fe x O 3 - y Solid Solutions journal August 2006
A Density Functional Theory Study of Self-Regenerating Catalysts LaFe 1– x M x O 3– y (M = Pd, Rh, Pt) journal November 2011
Cation Size Mismatch and Charge Interactions Drive Dopant Segregation at the Surfaces of Manganite Perovskites journal May 2013
Anodic Shock-Triggered Exsolution of Metal Nanoparticles from Perovskite Oxide journal April 2022
Growth Kinetics of Individual Co Particles Ex-solved on SrTi 0.75 Co 0.25 O 3-δ Polycrystalline Perovskite Thin Films journal April 2019
Facet-Dependent in Situ Growth of Nanoparticles in Epitaxial Thin Films: The Role of Interfacial Energy journal April 2019
Electrochemical Polarization Dependence of the Elastic and Electrostatic Driving Forces to Aliovalent Dopant Segregation on LaMnO 3 journal January 2020
Self-regeneration of a Pd-perovskite catalyst for automotive emissions control journal July 2002
Switching on electrocatalytic activity in solid oxide cells journal August 2016
In situ growth of nanoparticles through control of non-stoichiometry journal October 2013
Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites journal June 2017
Nano-socketed nickel particles with enhanced coking resistance grown in situ by redox exsolution journal September 2015
Improved chemical and electrochemical stability of perovskite oxides with less reducible cations at the surface journal June 2016
Demonstration of chemistry at a point through restructuring and catalytic activation at anchored nanoparticles journal November 2017
Factors controlling surface oxygen exchange in oxides journal March 2019
Anomalous metal segregation in lithium-rich material provides design rules for stable cathode in lithium-ion battery journal April 2019
Lattice strain-enhanced exsolution of nanoparticles in thin films journal April 2019
Understanding electrochemical switchability of perovskite-type exsolution catalysts journal September 2020
Promoting exsolution of RuFe alloy nanoparticles on Sr2Fe1.4Ru0.1Mo0.5O6−δ via repeated redox manipulations for CO2 electrolysis journal September 2021
Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites journal November 2021
Acidity of surface-infiltrated binary oxides as a sensitive descriptor of oxygen exchange kinetics in mixed conducting oxides journal October 2020
Formation and migration of cation defects in the perovskite oxide LaMnO3 journal January 1999
Cation diffusion in La0.6Sr0.4CoO3−δ below 800 °C and its relevance for Sr segregation journal January 2014
An electrical conductivity relaxation study of oxygen transport in samarium doped ceria journal January 2014
Microstructure evolution and kinetics of B-site nanoparticle exsolution from an A-site-deficient perovskite surface: a phase-field modeling and simulation study journal January 2019
Evolution of surface and sub-surface morphology and chemical state of exsolved Ni nanoparticles journal January 2022
Oxygen incorporation into Fe-doped SrTiO3: Mechanistic interpretation of the surface reaction journal August 2002
Ambient Pressure X-Ray Photoelectron Spectroscopy at the IOS (23-ID-2) Beamline at the National Synchrotron Light Source II journal May 2022
Oxygen surface exchange kinetics measurement by simultaneous optical transmission relaxation and impedance spectroscopy: Sr(Ti,Fe)O 3-x thin film case study journal February 2018
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Ab initiocalculations of theSrTiO3(110) polar surface journal January 2004
Investigation of Cathode Behavior of Model Thin-Film SrTi[sub 1−x]Fe[sub x]O[sub 3−δ] (x=0.35 and 0.5) Mixed Ionic-Electronic Conducting Electrodes journal January 2008
Gwyddion: an open-source software for SPM data analysis journal January 2012

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