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Kang S, Kim JK, Kim H, Son YH, Chang J, Kim J, Kim DW, Lee JM, Kwon HJ. Local Structures of Ex-Solved Nanoparticles Identified by Machine-Learned Potentials. NANO LETTERS 2024; 24:4224-4232. [PMID: 38557115 DOI: 10.1021/acs.nanolett.4c00388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
In this study, we identify the local structures of ex-solved nanoparticles using machine-learned potentials (MLPs). We develop a method for training machine-learned potentials by sampling local structures of heterointerface configurations as a training set with its efficacy tested on the Ni/MgO system, illustrating that the error in interface energy is only 0.004 eV/Å2. Using the developed scheme, we train an MLP for the Ni/La0.5Ca0.5TiO3 ex-solution system and identify the local structures for both exo- and endo-type particles. The established model aligns well with the experimental observations, accurately predicting a nucleation size of 0.45 nm. Lastly, the density functional theory calculations on the established atomistic model verify that the kinetic barrier for the dry reforming of methane are substantially reduced by 0.49 eV on the ex-solved catalysts compared to that on the impregnated catalysts. Our findings offer insights into the local structures, growth mechanisms, and underlying origin of the catalytic properties of ex-solved nanoparticles.
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Affiliation(s)
- Sungwoo Kang
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jun Kyu Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Hyunah Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - You-Hwan Son
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jaehee Chang
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jinwoo Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Dong-Wook Kim
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Jong-Min Lee
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
| | - Hyuk Jae Kwon
- Air Science Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Company, Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea
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Ruh T, Berkovec D, Schrenk F, Rameshan C. Exsolution on perovskite oxides: morphology and anchorage of nanoparticles. Chem Commun (Camb) 2023; 59:3948-3956. [PMID: 36916176 PMCID: PMC10065136 DOI: 10.1039/d3cc00456b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
Perovskites are very promising materials for a wide range of applications (such as catalysis, solid oxide fuel cells…) due to beneficial general properties (e.g. stability at high temperatures) and tunability - doping both A- and B-site cations opens the path to a materials design approach that allows specific properties to be finely tuned towards applications. A major asset of perovskites is the ability to form nanoparticles on the surface under certain conditions in a process called "exsolution". Exsolution leads to the decoration of the material's surface with finely dispersed nanoparticles (which can be metallic or oxidic - depending on the experimental conditions) made from B-site cations of the perovskite lattice (here, doping comes into play, as B-site doping allows control over the constitution of the nanoparticles). In fact, the ability to undergo exsolution is one of the main reasons that perovskites are currently a hot topic of intensive research in catalysis and related fields. Exsolution on perovskites has been heavily researched in the last couple of years: various potential catalysts have been tested with different reactions, the oxide backbone materials and the exsolved nanoparticles have been investigated with a multitude of different methods, and the effect of different exsolution parameters on the resulting nanoparticles has been studied. Despite all this, to our knowledge no comprehensive effort was made so far to evaluate these studies with respect to the effect that the exsolution conditions have on anchorage and morphology of the nanoparticles. Therefore, this highlight aims to provide an overview of nanoparticles exsolved from oxide-based perovskites with a focus on the conditions leading to nanoparticle exsolution.
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Affiliation(s)
- Thomas Ruh
- Chair of Physical Chemistry, Montanuniversity Leoben, 8700 Leoben, Austria. .,Institute of Materials Chemistry, TU Wien, 1060 Vienna, Austria
| | | | - Florian Schrenk
- Chair of Physical Chemistry, Montanuniversity Leoben, 8700 Leoben, Austria.
| | - Christoph Rameshan
- Chair of Physical Chemistry, Montanuniversity Leoben, 8700 Leoben, Austria. .,Institute of Materials Chemistry, TU Wien, 1060 Vienna, Austria
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Yang Y, Wang S, Tu X, Hu Z, Zhu Y, Guo H, Li Z, Zhang L, Peng M, Jia L, Yang M, Yang G, Qiao X, Sun J, Liang X, Zhang Z, Zhu Y, Shi L, Jiang C, Zhao Y, Li J, Shao Z, Zhang X, Sun Y. Atomic cerium modulated palladium nanoclusters exsolved ferrite catalysts for lean methane conversion. EXPLORATION (BEIJING, CHINA) 2022; 2:20220060. [PMID: 37324800 PMCID: PMC10190994 DOI: 10.1002/exp.20220060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 05/31/2022] [Indexed: 06/17/2023]
Abstract
The active and stable palladium (Pd) based catalysts for CH4 conversion are of great environmental and industrial significance. Herein, we employed N2 as an optimal activation agent to develop a Pd nanocluster exsolved Ce-incorporated perovskite ferrite catalyst toward lean methane oxidation. Replacing the traditional initiator of H2, the N2 was found as an effective driving force to selectively touch off the surface exsolution of Pd nanocluster from perovskite framework without deteriorating the overall material robustness. The catalyst showed an outstanding T50 (temperature of 50% conversion) plummeting down to 350°C, outperforming the pristine and H2-activated counterparts. Further, the combined theoretical and experimental results also deciphered the crucial role that the atomically dispersed Ce ions played in both construction of active sites and CH4 conversion. The isolated Ce located at the A-site of perovskite framework facilitated the thermodynamic and kinetics of the Pd exsolution process, lowering its formation temperature and promoting its quantity. Moreover, the incorporation of Ce lowered the energy barrier for cleavage of C─H bond, and was dedicated to the preservation of highly reactive PdOx moieties during stability measurement. This work successfully ventures uncharted territory of in situ exsolution to provide a new design thinking for a highly performed catalytic interface.
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Affiliation(s)
| | - Si Wang
- Beijing State Key Laboratory of Chemical Resource EngineeringBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina
| | - Xin Tu
- Department of Electrical Engineering and ElectronicsUniversity of LiverpoolLiverpoolUK
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of SolidsDresdenGermany
| | - Yinlong Zhu
- Institute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjingChina
| | | | - Zhishan Li
- College of EnergyXiamen UniversityXiamenChina
| | - Li Zhang
- College of EnergyXiamen UniversityXiamenChina
| | - Meilan Peng
- College of EnergyXiamen UniversityXiamenChina
| | - Lichao Jia
- School of Materials Science and Engineering, State Key Lab of Material Processing and Die & Mould TechnologyHuazhong University of Science and TechnologyWuhanChina
| | - Meiting Yang
- State Key Laboratory of Materials‐Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech UniversityNanjingChina
| | - Guangming Yang
- State Key Laboratory of Materials‐Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech UniversityNanjingChina
| | - Xurong Qiao
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'anChina
| | - Jiahui Sun
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'anChina
| | - Xiaolu Liang
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'anChina
| | - Zhen Zhang
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'anChina
| | - Yanru Zhu
- Beijing State Key Laboratory of Chemical Resource EngineeringBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina
| | - Lei Shi
- School of Chemical EngineeringDalian University of TechnologyDalianChina
| | | | - Yingru Zhao
- College of EnergyXiamen UniversityXiamenChina
| | - Jianhui Li
- National Engineering Laboratory for Green Chemical Productions of Alcohols‐Ethers‐Esters, College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina
| | - Zongping Shao
- State Key Laboratory of Materials‐Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech UniversityNanjingChina
| | - Xin Zhang
- Beijing State Key Laboratory of Chemical Resource EngineeringBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina
| | - Yifei Sun
- Beijing State Key Laboratory of Chemical Resource EngineeringBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina
- State Key Laboratory of Physical Chemistry of Solid SurfaceXiamen UniversityXiamenChina
- Shenzhen Research Institute of Xiamen UniversityShenzhenGuangdongChina
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