Rare Metals最新文献

{"title":"Degradation behavior analysis of LiNi0.83Co0.12Mn0.05O2/SiOx·graphite pouch cells under fast charging conditions","authors":"Ling Tang,&nbsp;Lve Wang,&nbsp;Yi Zhang,&nbsp;Jing Pang,&nbsp;Fu-Juan Han,&nbsp;Jing-Jing Li,&nbsp;Min-Juan Yang,&nbsp;Ze Wang,&nbsp;Feng-Ling Yun,&nbsp;Li-Jun Wang,&nbsp;Shi-Gang Lu","doi":"10.1007/s12598-024-03166-x","DOIUrl":"10.1007/s12598-024-03166-x","url":null,"abstract":"<div><p>High-nickel ternary silicon-carbon lithium-ion batteries, which use silicon-carbon materials as anodes and high-nickel ternary materials as cathodes, have already been commercialized as power batteries. The increasing demand for high-energy density and rapid charging characteristics has heightened the urgency of improving their fast charging cycle performance while establishing degradation mechanisms. Based on a pouch battery design with an energy density of 285 Wh·kg⁻¹, this work studied 3 Ah pouch batteries for fast charging cycles ranging from 0.5C to 3C. Non-destructive techniques, such as differential voltage, incremental capacity analysis, and electrochemical impedance spectroscopy, were employed to investigate the effects of charging rates on battery cycling performance and to establish the degradation mechanisms. The experimental results indicated that capacity diving was observed at all charging rates. However, at lower rates (0.5C–2C), more cycles were achieved, while at higher rates (2C–3C), the cycle life remained relatively stable. Computed tomography, electrochemical performance analysis, and physicochemical characterizations were obtained, using scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and inductively coupled plasma optical emission spectrometry. The mechanisms of capacity decrease during 3C fast charging cycles were investigated. It is proposed that the primary causes of capacity diving during 3C fast charging are the degradation of SiO_<i>x</i>, anode polarization, and the simultaneous dissolution of metal ions in the cathode which were deposited at the anode, resulting the continuous growth and remodeling of the SEI membrane at the anode, thereby promoting more serious side reactions.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"2958 - 2975"},"PeriodicalIF":9.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polymer-assisted in-situ growth of Cs3Sb2Br9 on Co3O4 to boost sacrificial-agent-free photocatalytic CO2 reduction","authors":"Ke Su,&nbsp;Su-Xian Yuan,&nbsp;You-Xiang Feng,&nbsp;Guang-Xing Dong,&nbsp;Yan-Fei Mu,&nbsp;Min Zhang,&nbsp;Tong-Bu Lu","doi":"10.1007/s12598-024-02968-3","DOIUrl":"10.1007/s12598-024-02968-3","url":null,"abstract":"<div><p>Halide perovskite-based heterojunctions have emerged as promising candidates for solar energy conversion and storage due to their unique photophysical properties. However, the current bottleneck lies in the insufficient separation of photogenerated carriers at the interface, primarily due to challenges in the controllable growth of perovskite on the substrate. Herein, we present a growth strategy for depositing lead-free Cs₃Sb₂Br₉ perovskite nanocrystals onto the surface of Co₃O₄ with the assistance of polyacrylic acid (PAA), generating a step-scheme (S-scheme) heterojunction denoted as Co₃O₄–Cs₃Sb₂Br₉. The utilization of PAA as a template can effectively regulate the nucleation and growth of Cs₃Sb₂Br₉, thereby significantly enhancing the charge separation efficiency of the Co₃O₄–Cs₃Sb₂Br₉ heterojunction compared to its counterpart formed without PAA assistance. Under simulated solar light irradiation (100 mW·cm⁻²), the cerium-doped Co₃O₄–Cs₃Sb₂Br₉ heterojunction exhibits excellent photocatalytic CO₂ reduction activity without the need for any sacrificial agent. Specifically, the CO yield reaches up to 700.7 μmol·g⁻¹·h⁻¹, marking a 2.8-fold increase over the sample synthesized without PAA mediation. This polymer-assisted in-situ growth strategy should open up a new avenue for designing and developing more efficient photocatalytic materials based on halide perovskites.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3194 - 3205"},"PeriodicalIF":9.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of porous Ga-In4Ag9 catalyst for CO2 electro-reduction to CO in three-chamber electrolyzer","authors":"Shuai Wu,&nbsp;Feng-Xia Shen,&nbsp;Peng-Chong Zhao,&nbsp;Jiang-Feng Mou,&nbsp;Shi-Peng Miao,&nbsp;Jian-Xiong Liu,&nbsp;Feng Shi,&nbsp;Jin Shi,&nbsp;Tian-You Chen","doi":"10.1007/s12598-024-03207-5","DOIUrl":"10.1007/s12598-024-03207-5","url":null,"abstract":"<div><p>Developing high-efficiency catalyst is crucial for electrochemical conversion of carbon dioxide (CO₂) to high-value products. In the present work, a three-chamber electrolysis cell has been developed for CO₂ reduction to carbon monoxide (CO) in an organic electrolyte, with sodium hydroxide (NaOH) and chlorine (Cl₂) produced as byproducts. In order to improve the performance of the three-chamber electrolyzer, a gallium-based (Ga-based) ternary-porous catalyst (Ga-In₄Ag₉) has been fabricated. During the long-term electrolysis process, Ga-In₄Ag₉ catalyst exhibits good performance toward CO₂ reduction reaction (CO₂RR), the CO partial current density achieves to 139.21 mA·cm⁻² at − 2.4 V (vs. SHE), with the Faraday efficiency (FE) of CO formation stabled at 92.3%. Density functional theory (DFT) analysis reveals that the position of the d-band center of Ga-In₄Ag₉ is regulated by silver (Ag) atoms, which is beneficial for enhancing the binding ability between the catalyst and the intermediate. Owing to the adsorption of Cl⁻ on the surface of Ga-In₄Ag₉, the reconfiguration of electron density has been altered, which is beneficial for the stabilization of *CO₂⁻ intermediate. This work provides valuable insights for designing Ga-based metal catalysts toward CO₂ electrolysis to produce high-value chemicals.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3182 - 3193"},"PeriodicalIF":9.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Medium-entropy configuration enabling reversible P2-OP4 phase transition in layered oxides for high-rate sodium-ion batteries","authors":"Fei-Fei Hong,&nbsp;Xin Zhou,&nbsp;Hao Liu,&nbsp;Gui-Lin Feng,&nbsp;Xiao-Hong Liu,&nbsp;Heng Zhang,&nbsp;Wei-Feng Fan,&nbsp;Bin Zhang,&nbsp;Mei-Hua Zuo,&nbsp;Wang-Yan Xing,&nbsp;Ping Zhang,&nbsp;Wei Xiang","doi":"10.1007/s12598-024-03196-5","DOIUrl":"10.1007/s12598-024-03196-5","url":null,"abstract":"<div><p>Layered transition metal oxides have emerged as promising cathode materials for sodium ion batteries. However, irreversible phase transitions cause structural distortion and cation rearrangement, leading to sluggish Na⁺ dynamics and rapid capacity decay. In this study, we propose a medium-entropy cathode by simultaneously introducing Fe, Mg, and Li dopants into a typical P2-type Na_0.75Ni_0.25Mn_0.75O₂ cathode. The modified Na_0.75Ni_0.2125Mn_0.6375Fe_0.05Mg_0.05Li_0.05O₂ cathode predominantly exhibits a main P2 phase (93.5%) with a minor O3 phase (6.5%). Through spectroscopy techniques and electrochemical investigations, we elucidate the redox mechanisms of Ni^2+/3+/4+, Mn^3+/4+, Fe^3+/4+, and O²⁻/O₂^<i>n</i>− during charging/discharging. The medium-entropy doping mitigates the detrimental P2-O2 phase transition at high-voltage, replacing it with a moderate and reversible structural evolution (P2-OP4), thereby enhancing structural stability. Consequently, the modified cathode exhibits a remarkable rate capacity of 108.4 mAh·g⁻¹ at 10C, with a capacity retention of 99.0% after 200 cycles at 1C, 82.5% after 500 cycles at 5C, and 76.7% after 600 cycles at 10C. Furthermore, it also demonstrates superior electrochemical performance at high cutoff voltage of 4.5 V and extreme temperature (55 and 0 °C). This work offers solutions to critical challenges in sodium ion batteries cathode materials.</p><h3>Graphic abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"2997 - 3007"},"PeriodicalIF":9.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical output performance of triboelectric nanogenerator based on magnetic high entropy alloy","authors":"Meng-Nan Liu,&nbsp;Lu-Yao Wang,&nbsp;Peng Wang,&nbsp;Lin-Xin Wu,&nbsp;Fang Yin,&nbsp;Jun Zhang,&nbsp;Yun-Ze Long","doi":"10.1007/s12598-024-03112-x","DOIUrl":"10.1007/s12598-024-03112-x","url":null,"abstract":"<div><p>Although traditional soft magnetic materials have been investigated to improve triboelectric nanogenerator (TENG) performance, their electrical output performance remains insufficient. Magnetic high-entropy alloys (HEAs), a new type of magnetic functional material, possess excellent mechanical and magnetic properties. However, the electrical characteristics of TENGs based on magnetic HEAs remain unexplored. Therefore, a TENG based on polyvinylidene fluoride/HEA-polyamide 66 (PHP-TENG) is proposed in this study. The coupling of displacement current from the polarization field and magnetization current generated by time-varying electric-field magnetization of magnetic HEAs can improve the electrical characteristics of TENGs. The maximum voltage, current, and power density of the PHP-TENG are 156.34 V, 1.56 μA, and 188.40 mW·m⁻², respectively. PHP-TENG maintains a stable current output even after 20,000 cycles. Furthermore, it can power a 47 μF commercial capacitor to 2.5 V in 70 s and propel a hygrometer to function normally. In addition, PHP-TENG exhibits satisfactory sensitivity to humidity. These results indicate that TENGs based on magnetic HEAs exhibit potential for high-efficiency energy-collecting devices.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2547 - 2563"},"PeriodicalIF":9.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multilevel structured CuCoP with synergistic catalytic active site designed for hydrogen evolution coupled gluconic acid synthesis","authors":"Xiang-Dong Ma,&nbsp;Rui Liu,&nbsp;Shan Yue,&nbsp;Hai-Jiao Xie,&nbsp;Xiao-Hong Xia","doi":"10.1007/s12598-024-03103-y","DOIUrl":"10.1007/s12598-024-03103-y","url":null,"abstract":"<div><p>Hydrogen production coupled with small molecule oxidation derived by renewable energy power has been widely studied as an effective method to reduce energy consumption and prepare added value production. Here, the copper-cobalt phosphide with a multilevel structure has been designed based on the hard and soft acids and bases theory. The nanocone composed of lamellas presented a sharp tip, which a positive effect on the mass transfer enhanced by a local electric field, and the nanolamellas contain CoP/Cu₃P interface provide the highly selective active site for the gluconic acid (GNA) synthesis and hydrogen evolution. The catalyst can drive hydrogen evolution at 5 A·cm⁻² up to 437 h without active decay, and the electrocatalytic glucose oxidation at anode presents high efficiency due to Cu (I) introduction and the synergetic effect between interfaces. Density functional theory (DFT) calculation shows that water splitting more readily occurs at the CoP, which provides adsorbed H and −OH for hydrogen evolution and glucose oxidation, respectively, and glucose adsorption more readily occurs at the Cu₃P, which presents lower conversion energy for high value-added GNA. Efficient hydrogen evolution and glucose conversion indicate its high intrinsic activity and synergetic effect. This work provides a special interface construction strategy for the catalytic conversion of hydrogen and small molecules.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3141 - 3155"},"PeriodicalIF":9.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced energy-storage performances and thermal stability in BNT–LST-based ceramics by tuning domain configuration and bandgap","authors":"Fang-Fang Zeng,&nbsp;Qian-Si Zhang,&nbsp;Shi-Dong Zhang,&nbsp;Qi Sun,&nbsp;Hui-Tao Guo,&nbsp;Qing-Quan Xiao,&nbsp;Quan Xie,&nbsp;Li Zhang,&nbsp;Gui-Fen Fan,&nbsp;Yun-Peng Qu,&nbsp;Jia Liu,&nbsp;Qi-Bin Liu,&nbsp;Yun-Lei Zhou","doi":"10.1007/s12598-024-03051-7","DOIUrl":"10.1007/s12598-024-03051-7","url":null,"abstract":"<div><p>Low energy-storage density and inferior thermal stability are a long-term obstacle to the advancement of pulse power devices. Herein, these concerns are addressed by improving bandgap and fabricating polar nanoregions, and the superior high efficiency of ~ 86.7%, excellent thermal stability of ~ 2% (31–160 °C) and energy density of ~ 6.8 J·cm^–3 are achieved in Bi_0.5Na_0.5TiO₃–La_0.1Sr_0.8TiO_3-_<i>δ</i>–NaNbO₃ ceramics. The high breakdown strength (460 kV·cm^–1) is ascribed to the broadened bandgap and refined grain. Slim ferroelectric loops originate from the construction of polar nanoregions (PNRs) in a pseudocubic matrix, and transmission electron microscope and piezoelectric force microscope measurements reveal the occurrence of PNRs. The phase-field stimulation and UV–Vis spectrophotometer measurement reveal that the increased grain boundary density and bandgap are beneficial for promoting breakdown strength. The strategy provides an efficient path to prepare Bi_0.5Na_0.5TiO₃La_0.1Sr_0.8TiO_3-_<i>δ</i>-based ceramics with superior efficiency, high energy density and outstanding thermal stability.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3313 - 3323"},"PeriodicalIF":9.6,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistically optimized electronic and phonon transport properties in cubic SnSe thermoelectric materials via Pb doping","authors":"Wen-Ying Wang,&nbsp;Jun-Liang Zhu,&nbsp;Lin Bo,&nbsp;Wen-Ying Zhou,&nbsp;Xing-Shuo Liu,&nbsp;Chang-Cun Li,&nbsp;Zheng Zhang,&nbsp;De-Gang Zhao","doi":"10.1007/s12598-024-03070-4","DOIUrl":"10.1007/s12598-024-03070-4","url":null,"abstract":"<div><p>The rock-salt cubic SnSe compound with multiple valleys and inherent low thermal conductivity is considered to be a promising thermoelectric compound. In this study, heterogeneous Pb atoms were strategically introduced into the lattice of cubic SnSe matrix, synergistically adjusting the thermoelectric transport properties of samples by optimizing hole carrier concentration (<i>n</i>) and suppressing thermal conductivity (<i>κ</i>_tot). When the doping content reached 0.08 mol, the peak power factor (PF) at 300 K increased to 20.00 μW·cm^–1·K^–2. The growing internal microstrain induced by the differences in atomic size strengthened the phonon scattering and effectively reduced the lattice thermal conductivity (<i>κ</i>_L). With further decoupling of the electrical and thermal transport properties, a peak thermoelectric figure of merit (<i>ZT</i>) of 0.82 and an average <i>ZT</i> of 0.42 (300–750 K) were achieved in the samples doped with 0.10 mol Pb. These findings highlight the effectiveness of the selected dopants and demonstrate their synergy in improving the performance of thermoelectric materials.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3339 - 3350"},"PeriodicalIF":9.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automatic clustering of single-molecule break junction data through task-oriented representation learning","authors":"Yi-Heng Zhao,&nbsp;Shen-Wen Pang,&nbsp;Heng-Zhi Huang,&nbsp;Shao-Wen Wu,&nbsp;Shao-Hua Sun,&nbsp;Zhen-Bing Liu,&nbsp;Zhi-Chao Pan","doi":"10.1007/s12598-024-03089-7","DOIUrl":"10.1007/s12598-024-03089-7","url":null,"abstract":"<div><p>Clustering is a pivotal data analysis method for deciphering the charge transport properties of single molecules in break junction experiments. However, given the high dimensionality and variability of the data, feature extraction remains a bottleneck in the development of efficient clustering methods. In this regard, extensive research over the past two decades has focused on feature engineering and dimensionality reduction in break junction conductance. However, extracting highly relevant features without expert knowledge remains an unresolved challenge. To address this issue, we propose a deep clustering method driven by task-oriented representation learning (CTRL) in which the clustering module serves as a guide for the representation learning (RepL) module. First, we determine an optimal autoencoder (AE) structure through a neural architecture search (NAS) to ensure efficient RepL; second, the RepL process is guided by a joint training strategy that combines AE reconstruction loss with the clustering objective. The results demonstrate that CTRL achieves excellent performance on both the generated and experimental data. Further inspection of the RepL step reveals that joint training robustly learns more compact features than the unconstrained AE or traditional dimensionality reduction methods, significantly reducing misclustering possibilities. Our method provides a general end-to-end automatic clustering solution for analyzing single-molecule break junction data.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3244 - 3257"},"PeriodicalIF":9.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A-site defect construction in medium-entropy SrTiO3 ceramics for enhanced thermoelectric performance","authors":"Hong-Xin Wang,&nbsp;Xin-Lei Wang,&nbsp;Tong-An Bu,&nbsp;Shan-Shan Xu,&nbsp;Pan-Pan Lv,&nbsp;Lu-Chao Ren,&nbsp;Peng-Fei Zhang,&nbsp;Cun-Cheng Li,&nbsp;Ming-Wei Zhang,&nbsp;Wen-Yu Zhao","doi":"10.1007/s12598-024-03177-8","DOIUrl":"10.1007/s12598-024-03177-8","url":null,"abstract":"<div><p>The compositional flexibility and structural stability of SrTiO₃-based perovskite oxides present a promising approach to tailor their electrical and thermal transport properties. In this work, a series of (Ca_0.25Nd_0.25Sr_0.35Ba_0.15)_1-<i>x</i>TiO_3±<i>δ</i> ceramics with varying A-site deficiencies were designed by integrating entropy engineering and defect chemistry, and their microstructural characteristics and transport properties were systematically investigated. All samples exhibited a stable single-phase <span>(Pmoverline{3}m)</span> cubic structure with uniformly distributed constituent elements. The introduction of A-site vacancies created favorable pathways for ion diffusion during the sintering process and facilitated grain growth. A-site deficiencies significantly increased carrier concentration by promoting the formation of oxygen vacancies and Ti³⁺, while also enhancing carrier mobility by improving structural symmetry and reducing grain boundary scattering, leading to the improved power factor. The multiscale defects resulting from entropy engineering including point defects, strain fields, and high-density grain boundaries contributed to the reduced thermal conductivity of all samples. By synergistically optimizing the entropy and defect engineering, the sample with <i>x</i> = 0.09 achieved a peak figure of merit (<i>ZT</i>) of 0.21 at 900 K, representing a 32% enhancement compared with that of the <i>x</i> = 0.03 sample. This work underscores the significance of the combined strategy of entropy engineering and defect chemistry in manipulating the transport properties of SrTiO₃-based thermoelectric oxides.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 5","pages":"3324 - 3338"},"PeriodicalIF":9.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}