International Journal of Extreme Manufacturing
·
2024
·Vol. 6
·期 5
·055002
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IF 16.1
Lurun Xu,Jingchao Tao,Zhuguo Li,Guo He,Dongshi Zhang
Exsolution, as an effective approach to constructing particle-decorated interfaces, is still challenging to yield interfacial films rather than isolated particles. Inspired by in vivo near-infrared laser photothermal therapy, using 3 mol% Y2O3 stabilized tetragonal zirconia polycrystals (3Y-TZP) as host oxide matrix and iron-oxide (Fe3O4/γ-Fe2O3/α-Fe2O3) materials as photothermal modulator and exsolution resource, femtosecond laser ultrafast exsolution approach is presented enabling to conquer this challenge. The key is to trigger photothermal annealing behavior via femtosecond laser ablation to initialize phase transition from monoclinic zirconia (m-ZrO2) to tetragonal zirconia (t-ZrO2) and induce t-ZrO2 columnar crystal growth. Fe-ions rapidly segregate along grain boundaries and diffuse towards the outmost surface, and become 'frozen', highlighting the potential to use photothermal materials and ultrafast heating/quenching behaviors of femtosecond laser ablation for interfacial exsolution. Triggering interfacial iron-oxide coloring exsolution is composition and concentration dependent. Photothermal materials themselves and corresponding photothermal transition capacity play a crucial role, initializing at 2 wt%, 3 wt%, and 5 wt% for Fe3O4/γ-Fe2O3/α-Fe2O3 doped 3Y-TZP samples. Due to different photothermal effects, exsolution states of ablated 5 wt% Fe3O4/γ-Fe2O3/α-Fe2O3-doped 3Y-TZP samples are totally different, with whole coverage, exhaustion (ablated away) and partial exsolution (rich in the grain boundaries in subsurface), respectively. Femtosecond laser ultrafast photothermal exsolution is uniquely featured by up to now the deepest microscale (10 μm from 5 wt%-Fe3O4-3Y-TZP sample) Fe-elemental deficient layer for exsolution and the whole coverage of exsolved materials rather than the formation of isolated exsolved particles by other methods. It is believed that this novel exsolution method may pave a good way to modulate interfacial properties for extensive applications in the fields of biology, optics/photonics, energy, catalysis, environment, etc.
研究领域:
材料科学
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光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Mengting Wang,Jiajun Yang,Bo Chi,Jian Pu,Jian Li
La 0.8 Ce 0.2 Mn 0.6 Ni 0.4 O 3 with (LCMN@CuO) and without (LCMN) CuO addition are prepared by solution methods, followed by reduction in 5% H 2 –N 2 stream at 650 °C to form Ni exsolved and CuO reduced catalysts, LCMN@Ni and LCMN@Ni/Cu, for ethanol (EtOH) steam reforming (ESR). The catalysts are characterized by X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), temperature programmed reduction (H 2 -TPR), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy etc., and are evaluated for ESR with a steam/carbon ratio of 3 and a weight hourly space velocity (WHSV) of 4 h −1 at temperatures between 500 and 700 °C. Ni exsolution and CuO reduction are confirmed on the substrates in LCMN@Ni and LCMN@Ni/Cu. Both the catalysts demonstrate a complete conversion of EtOH, forming mainly H 2 , CO 2 , CO and CH 4 . And increasing temperature to 700 °C increases the yields of H 2 and CO to the levels about 90% and 40%, respectively, at the cost of CH 4 ; and such performance remains unchanged for 30 h. These results indicate that both LCMN@Ni and LCMN@Ni/Cu are promising catalysts for ESR, the main difference between them is that the latter is more chemically stable and more resistant to carbon deposition under ESR conditions.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yilan Jiang,Zhibin Geng,Long Yuan,Yu Sun,Yingge Cong,Keke Huang,Lei Wang,Wei Zhang
The exsolution of noble metal nanoparticles (NPs) from perovskite usually requires high doping ratio of noble metal. Herein, we constructed a RuO2/LFRO composite by the exsolution of a low Ru-substituted A-site deficient perovskite, La0.9Fe0.92Ru0.08O3 (LFRO). In this process, pure Ru NPs are in situ exsolved from LFRO via a relatively low temperature heat treatment in 5% H2/Ar. Then the exsolved Ru NPs were oxidized to RuO2 for oxygen evolution reaction (OER) applications. The RuO2/LFRO composite achieved a high OER performance compared with the pristine LFRO, which is mainly originated from the generation of electrochemically active RuO2 NPs and the improvement of conductivity. In addition, the exsolution is a reversible process that the exsolved Ru NPs can disappear into the perovskite lattice at 550 °C in air. Our work thereof demonstrates an effective strategy to minimize the dosage of precious metals for catalytic applications in different fields.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2021
·
IF 9.746
Bangxin Li,John T.S. Irvine,Jiupai Ni,Chengsheng Ni
A solid oxide fuel cell utilizing bio-fuels such as methanol and ethanol could provide a carbon–neutral electricity generation and facilitate its applications in transport or stationary power unit. Herein, Ce 4+ doping in SrFe 0.95 Ni 0.05 O 3 imparts FeNi 3 exsolution and CeO 2 precipitation in a reducing condition, contributing to the fuel reforming, C-C bond cleavage and coke consumption in the anode chamber. The ferrite perovskites are stable in ethanol/steam at 800 °C, whereas they are unstable in ethanol vapor with the high C fugacity inducing the formation of Fe 0 and carbides. However, the Ce 0.2 Sr 0.8 Fe 0.95 Ni 0.05 O 3 anode maintains mostly the perovskite and is free from coke after the 300 h’ operation under C 2 H 5 OH fuel at 0.5 V or 0.7 V because of the dynamic balance between the carbon deposition and consumption since an operation for 10 h shows a clear carbon deposition. A maximum power density of 0.58 W cm −2 and a polarization resistance of 0.21 Ω cm 2 at 800 °C can be obtained for the symmetrical solid oxide fuel cell with identical Ce 0.2 Sr 0.8 Fe 0.95 Ni 0.05 O 3 cathode and anode under an ethanol fuel. The results demonstrate that the reversible and stable SrFeO 3 with Ce/Ni co-doping has a bright prospect for alcohol fuel oxidation.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Xiaojuan Cao,Le Ke,Kai Zhao,Xiaoyu Yan,Xiaoyu Wu,Ning Yan
The exsolution of metallic nanoparticles (NPs) from perovskite oxides is a promising strategy for synthesizing supported catalysts. The associated segregation of A-site cations on the surface is challenging to investigate experimentally and is often detrimental to the catalytic performance. In this work, we found that during the in situ exsolution of Ni-Co bimetallic nanoparticles from Pr0.45Ba0.45Mn1–x(Co1/3 Ni2/3)xO3±δ, A-site cation enrichment occurred on the surface when x is 0.1; yet, the perovskite surface decomposed when x reached 0.2, forming a thin layer comprising various nanocrystalline oxides, which partially blocked the active sites of the exsolved Ni-Co particles. A hydration and carbonation reaction facilitated the conversion of nanocrystalline BaO species into large and highly crystallized BaCO3 particles. This enabled the exposure of more Ni-Co active sites and offered a chance to quantify that the decomposed surface layer accounts for ∼7.2 wt % of the total perovskite. Because of this unique feature, the surface-decomposed catalyst showed higher activity in the dry methane reforming reaction with better stability. Importantly, the regeneration feature was not hampered as the complete exsolution-dissolution recyclability of the catalyst remained.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Bin Cheng,Xiaohui Yan,Junkun Wu,Lunhua He,Wenbin Guo,Xiuyun Lei,Congling Yin,Xiaojun Kuang
Hexagonal perovskite manganite has attracted much attention due to its rich structural chemistry and magnetic properties . The transformation between Ba M x Mn 1− x O 3 polymorphs can be caused by the change in substitution level or oxygen vacancies . In this study, we find a new polymorph change from 10 H Ba 5 Sb 0.7 Mn 4.3 O 15 ( P 6 3 / mmc ) to 12 R Ba 4 Sb 0.85 Mn 3.15 O 12 ( R 3 ‾ m ) via a ‘topochemical’ reaction with excess Sb 2 O 3 . The 10 H Ba 5 Sb 0.7 Mn 4.3 O 15 structure contains BaO 3 layers in a ( cchhh ) 2 sequence and face-shared MnO 6 tetramers (Mn 4 clusters), while the 12 R Ba 4 Sb 0.85 Mn 3.15 O 12 structure consists of BaO 3 layers in a ( cchh ) 3 stacking and face-shared MnO 6 trimers (Mn 3 clusters). The 10 H → 12 R phase conversion accompanies the exsolution of the Mn 3 O 4 phase in trace amounts. For both 10 H Ba 5 Sb 0.71 Mn 4.29 O 15 and 12 R Ba 4 Sb 0.85 Mn 3.15 O 12 , the Mn 3+ cation on the corner-shared octahedra at M 1 sites mediated competing ferromagnetic and antiferromagnetic exchanges between the magnetic Mn 3 and Mn 4 clusters, leading to spin-freezing transition at T F ≈ 11–15 K. The 10 H → 12 R phase change leads to an abrupt change of 2 K saturation moment from M s ≈ 0.1 μ B of 10 H Ba 5 Sb 0.71 Mn 4.29 O 15 to M s ≈ 1.75 μ B of 12 R Ba 4 Sb 0.85 Mn 3.15 O 12 .
研究领域:
材料科学
·
固体物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Menglin Wu,Jiupai Ni,Chengsheng Ni
In situ exsolution of nanoparticles has been reported to be an efficient path to optimize CO2 electrolysis performance. Herein, a Ce/Co co-doped SrFeO3-δ (SF) can achieve the co-exsolution of CeO2 and Co–Fe alloy in 5% H2 at 800 °C. A small amount (<10%) of Ce-doped SF cannot stabilize the perovskite structure in a reducing atmosphere. Sr0.9Ce0.1Fe0.9Co0.1O3 (10Ce10CoF) and Sr0.95Ce0.05Fe0.9Co0.1O3 (5Ce10CoF) as symmetric electrodes of solid oxide electrolysis cells showed an excellent electrolysis performance at 800 °C for CO2 electrolysis. The current densities of the cells with 5Ce10CoF and 10Ce10CoF reached 0.98 and 1.30 A cm–2 under a bias of 1.3 V after a 48 h durability test for CO2 electrolysis, respectively, and the performance difference, however, may be due to CeO2 being more easily exsolved from the 10Ce10CoF lattice. We also investigated the role of the exsolved CeO2 and oxygen vacancy (VO) in determining the CO2 electrolysis performance via theoretical calculation. In this work, we designed a novel strategy to achieve the exsolution of CeO2 and Co–Fe alloy via reduction treatment and showed an outstanding CO2 electrolysis performance.
研究领域:
材料科学
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化学工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Zhengrong Liu,Jun Zhou,Yueyue Sun,Xiangling Yue,Jiaming Yang,Lei Fu,Qinyuan Deng,Hongfei Zhao,Chaofan Yin,Kai Wu
Solid oxide electrolysis cell (SOEC) could be a potential technology to afford chemical storage of renewable electricity by converting water and carbon dioxide. In this work, we present the Ni-doped layered perovskite oxides, (La 4 Sr n −4 ) 0.9 Ti 0.9 n Ni 0.1 n O 3 n +2 with n = 5, 8, and 12 (LSTNn) for application as catalysts of CO 2 electrolysis with the exsolution of Ni nanoparticles through a simple in-situ growth method. It is found that the density, size, and distribution of exsolved Ni nanoparticles are determined by the number of n in LSTNn due to the different stack structures of TiO 6 octahedra along the c axis. The Ni doping in LSTNn significantly improved the electrochemical activity by increasing oxygen vacancies, and the Ni metallic nanoparticles afford much more active sites. The results show that LSTNn cathodes can successfully be manipulated the activity by controlling both the n number and Ni exsolution. Among these LSTNn (n = 5, 8, and 12), LSTN8 renders a higher activity for electrolysis of CO 2 with a current density of 1.50A cm −2 @2.0 V at 800 °C It is clear from these results that the number of n in (La 4 Sr n −4 ) 0.9 Ti 0.9 n Ni 0.1 n O 3 n +2 with Ni-doping is a key factor in controlling the electrochemical performance and catalytic activity in SOEC.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhihong Du,Yue Gong,Hailei Zhao,Yang Zhang,Sha Yi,Lin Gu
Exsolution of catalytic nanoparticles (NPs) from perovskites has arisen as a flexible method to develop high-performance functional materials with enhanced durability for energy conversion and catalytic synthesis applications. Here, we unravel the interface structure of the in situ exsolved alloy nanoparticles from the double perovskite substrate on the atomic scale. The results show that the Co–Fe alloy NPs exsolved topologically from the {100} facets terminations of the Sr2FeMo0.65Co0.35O6−δ (SFMC) double perovskite along ⟨100⟩ directions exhibiting the same orientation and identical crystal structure. The lattice planes of these two phases align and insert into each other at the interface, forming a smooth and continuous coherent connection. The presence of moiré patterns at the interface confirms the topological exsolution mechanism. The coherent interface can significantly reduce the interfacial energy and therefore stabilize the exsolved nanoparticles. Therefore, excellent and stable electrochemical performance of the NP-decorated SFMC perovskite is observed as the anode for solid oxide fuel cells. Our contribution promotes a fundamental understanding of the interface structure of the in situ exsolved alloy nanoparticles from perovskite substrate.
研究领域:
材料科学
·
能源转换技术
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yuanhui Shen,Yunlian Liu,Ying Pan,Hongguang Jin
Chemical looping dry reforming of methane (CL-DRM) represents an innovative CO 2 utilization technology that enables efficient conversion of CH 4 and CO 2 while producing high-quality syngas. To investigate the carbon resistance of oxygen carriers, we present a comprehensive analysis of carbon deposition mechanisms in CL-DRM from both thermodynamic and experimental perspectives, establishing a quantitative correlation between carbon deposition and oxygen carrier characteristics. Experimental validation confirmed the thermodynamic predictions. Utilizing an exsolution strategy, we successfully synthesized nano-Ni-modified iron-based perovskite, which demonstrated exceptional reactivity and carbon resistance at 800 °C. This work provides both theoretical and practical guidance for the development of advanced oxygen carriers in CL-DRM systems.
研究领域:
能源工程
·
化学工程
·
材料科学
·
环境科学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）