Materials Horizons
·
2022
·Vol. 10
·期 2
·454-465
·
IF 15.717
Jianbo Li,Yanxia Wang,Xue Jiang,Zhen Tian,Huijun Kang,Zongning Chen,Enyu Guo,Zhiqiang Cao,Tongmin Wang
The thermal conductivity of superlattices is strongly reduced as compared to that of the parent materials due to phonon-scattering and thermal boundary resistances at the superlattice period interfaces. Herein, homogenous superlattices consisting of homogenous structural CeδCa1−δTiO3 and CaTi1−δCeδO3 alternate layers were obtained through a variable-valence Ce doping, providing multi-quantum well interfaces between the alternate layers due to Ce-substitution at Ca and Ti sites, respectively. This material comprising these homogenous superlattices displayed a significantly reduced lattice thermal conductivity of 1.82 W m−1 K−1 and a record high zT value of 0.405 at 1031 K in CaTiO3-based thermoelectric materials. This strategy of synthesizing homogeneous superlattices provides a cost advantage over heterogeneous superlattices prepared by the molecular beam epitaxy method and paves a route for preparing bulk superlattices with unique thermoelectric properties rooting in the quantum domain limiting effect.
研究领域:
材料科学
·
热电学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hao Wang,Zixuan Yang,Yutong Gao,Ziyue Zheng,Jing Yang,Ting Wang,Dong Yang,Yajun Wang,Tongtao Li,Angang Dong
We present a coordination-inspired strategy for assembling binary nanocrystal superlattices (BNSLs) using CdSe nanotetrapods as symmetry-encoding building blocks. Exploiting their intrinsic tetrahedral geometry, which mimics the sp 3 hybridization of carbon atoms in a diamond lattice, we encode spatially defined binding sites that guide regioselective coassembly with spherical nanocrystals. By tuning the size ratio between components, we achieve both three-dimensional and two-dimensional BNSLs with long-range structural order. Notably, in NaCl-type BNSLs, the CdSe tetrapod sublattice defines a hypothetical porous network that is topologically analogous to a diamond lattice—an architecture difficult to realize using isotropic nanocrystals. The key advantage of this approach lies in its ability to translate molecular coordination principles into nanoscale assembly, thereby enabling access to architecturally complex and topologically rich lattices. A potential limitation, however, is the need for precise control over component size and shape to ensure high-quality ordering. By integrating molecular coordination concepts with nanocrystal assembly, this work establishes nanotetrapods as versatile symmetry-directing building blocks for the rational design of next-generation superlattices. This work establishes nanotetrapods as symmetry-directing building blocks for designing architecturally complex BNSLs, bridging molecular coordination chemistry with nanocrystal assembly.
研究领域:
材料科学
·
纳米技术
·
化学
·
凝聚态物理
·
自组装
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2021
·
IF 15.881
Xunuo Lou,Shuang Li,Xiang Chen,Qingtang Zhang,Houquan Deng,Jian Zhang,Di Li,Xuemei Zhang,Yongsheng Zhang,Haibo Zeng,Guodong Tang
Polycrystalline SnSe materials with ZT values comparable to those of SnSe crystals are greatly desired due to facile processing, machinability, and scale-up application. Here manipulating interatomic force by harnessing lattice strains was proposed for achieving significantly reduced lattice thermal conductivity in polycrystalline SnSe. Large static lattice strain created by lattice dislocations and stacking faults causes an effective shortening in phonon relaxation time, resulting in ultralow lattice thermal conductivity. A combination of band convergence and resonance levels induced by Ga incorporation contribute to a sharp increase of Seebeck coefficient and power factor. These lead to a high thermoelectric performance ZT ∼ 2.2, which is a record high ZT reported so far for solution-processed SnSe polycrystals. Besides the high peak ZT, a high average ZT of 0.72 and outstanding thermoelectric conversion efficiency of 12.4% were achieved by adopting nontoxic element doping, highlighting great potential for power generation application at intermediate temperatures. Engineering lattice strain to achieve ultralow lattice thermal conductivity with the aid of band convergence and resonance levels provides a great opportunity for designing prospective thermoelectrics.
研究领域:
材料科学
·
热电材料
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy & Environmental Science
·
2023
·Vol. 16
·期 12
·6046-6057
·
IF 32.5
Haotian Gao,Kunpeng Zhao,Hexige Wuliji,Min Zhu,Beibei Xu,He Lin,Liting Fei,Hongyao Zhang,Zhengyang Zhou,Jingdan Lei,Heyang Chen,Shun Wan,Tian-Ran Wei,Xun Shi
High-entropy engineering is considered one of the most promising strategies in materials science, including the field of thermoelectrics. However, the presence of multiple elements with different atomic sizes and electronegativities in high-entropy materials often results in phase separation instead of the formation of a single phase. Herein, we propose that the adaptable sublattice can effectively stabilize single-phase high-entropy materials. Furthermore, the electrical and thermal transports can be efficiently tuned for much enhanced thermoelectric performance. Taking Mg2−δ(Si, Ge, Sn, Bi) as a case study, the loosely bonded Mg sublattice is featured with large dynamic adaptability or flexibility, enabling it to release the large lattice strains caused by the large atomic size mismatch among Si, Ge, Sn and Bi. The resulting ultralow lattice thermal conductivity of 0.58 W m−1 K−1 at 800 K is not only approaching the amorphous limit but also lower than that of all known Mg2X-based materials. Additionally, the interplay between the substitutional BiSn defects and self-compensational Mg vacancies leads to an optimized carrier concentration and thereby high power factors. A maximum zT value of 1.3 is finally realized at 700 K in Mg2−δSi0.12Ge0.13Sn0.73Bi0.02, which is among the top values of all Mg2X-based materials. This study highlights the role of an adaptable sublattice in stabilizing high-entropy materials and offers a new pathway for exploring high-performance thermoelectric materials.
研究领域:
材料科学
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热电材料
·
晶体结构
·
凝聚态物理
·
能源转换技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Wu Qinyue,Fan Xinfei,Shan Bing,Qi Liang,Quan Xie,Liu Yanming
Electrocatalytic NO 3 − reduction (eNO3RR) is a sustainable method for purification of NO 3 − wastewater and NH 3 recovery. Cu-based catalysts are promising for eNO3RR, but insufficient active hydrogen (*H) supply and *NO 2 poison of active sites have hindered their performance, and the catalytic mechanism remains ambiguous. Here, we report oxide-derived copper nanosheet arrays (OD-Cu NSs) with residual lattice oxygen and lattice strains to enhance NH 3 synthesis from eNO3RR. It is efficient for NH 3 synthesis with high Faradaic efficiencies of 88.7-99.7% and maximum NH 3 yield of 6.20 mmol·h −1 ·cm −2 at neutral solution, 10-140 mM NO 3 − and 50-1500 mA·cm −2 . Experimental and theoretical results reveal that lattice oxygen regulates the electronic structure of OD-Cu NSs and promotes *NO 2 conversion, while lattice strain enhances *H generation from water dissociation, resulting in the good performance for NH 3 synthesis. The applicability of OD-Cu NSs is proved by the high recovery of ammonia compound from eNO3RR.
研究领域:
电催化
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
National Science Review
·
2024
·
IF 16.3
Huang Yuling,Gong Shaokuan,Chen Qianxia,Chen Congcong,Yang Zhangqiang,Wang Kang,Xue Jie,Wang Daozeng,Lu Haipeng,Mao Lingling,Yang Ye,Zhao Jin-Zhu,Chen Xihan
Halide perovskites have attracted substantial attention recently. However, the strong lattice distortion effects in these materials have led to debates regarding the nature of charge carriers. While the behavior of carriers in bulk three-dimensional materials is well-documented, the characteristics of carriers in two-dimensional perovskites remain less well understood. In this study, we provide direct and clear evidence of small polaron formation through transient spectroscopic analysis of deformation potential and dynamic lattice screening. Coherent acoustic phonon wave signals reveal a strong coupling between carriers and lattice degrees of freedom, leading to small polaron formation and a spin lifetime enhancement of up to 10-fold. Utilizing optical Kerr spectroscopy and theoretical modeling, we observed a notably long polarization response time at room temperature, attributed to lattice distortion and small polarons approximately two-unit cells in size. Temperature-dependent coherent phonon dynamics and X-ray diffraction further confirmed the presence of small polarons. This discovery underscores the significance of the cooperative interplay between exciton dynamics and the small polaron field, particularly in influencing the Coulomb exchange interaction of excitons.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2025
·Vol. 15
·期 38
·e03481
·
IF 26
Minhui Yuan,Zhen Tong,Qing Cao,Wenjie Li,Min Ruan,Jiahao Jiang,Jingyi Lyu,Yanglong Hou,Ran He,Jing Shuai
N -type Mg 3 (Sb,Bi) 2 system has emerged as a groundbreaking thermoelectric (TE) material, renowned for its optimized electronic transport properties and intrinsically low lattice thermal conductivity (κ l ). However, the origin of anomalously low κ l and its weak temperature scaling (κ l ∼ T −0.5 , deviating from the classical T −1 behavior) remain elusive. Employing a theoretical framework that integrates ab initio anharmonic lattice dynamics into a unified heat transport theory accounting for particle-like propagation (κ p ) and wave-like coherent (κ c ) transport, phonon renormalization, and fourth-order anharmonic phonon scattering, the thermal transport property of Mg 3 Bi 2 is comprehensively investigated. It is found that the weakly bonded interlayer cation Mg atoms amplify phonon coherence through dynamic disorder, driving wave-like transport contributes ≈40% to κ l at 600 K, while four-phonon scattering significantly suppresses particle-like propagation (>40% reduction). The theoretical predictions of both the magnitude and temperature-dependent behavior of κ l in Mg 3 Bi 2 exhibit synergistic agreement with in-house and reported experimental values. This work pioneers key insights into the Mg cation sublattice tuning the particle-wave duality in phonon transport, its strong anharmonic potential disrupts phonon phase coherence while enhancing four-phonon scattering, collectively driving the low κ l in Mg 3 Bi 2 . This discovery provides two actionable design strategies—cation site engineering and coherent phonon tuning—for developing high- zT Mg 3 Bi 2 -based thermoelectrics.
研究领域:
材料科学
·
热电学
·
凝聚态物理
·
声子输运
·
计算材料物理
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuqing Sun,Adeel Abbas,Hongxiang Wang,Chang Tan,Zhihao Li,Yujie Zong,Hui Sun,Chunlei Wang,Hongchao Wang
Quaternary Cu 2 MnSnSe 4 alloys with low intrinsic thermal conductivity are identified as promising middle-temperature thermoelectric materials. However, zT is depressed by the poor electrical performance. To overcome this issue, here, a series of Cu 2.1 Mn 0.9 SnSe 4 samples are prepared by ball-milling method which appears as a time-saving technique and lattice strain variation is observed by changing the annealing time ( x = 0, 1, 2, 3, 4 days). The vacancy defects concentration of Cu, with lowest vacancy defects formation energy, is changed with the competition between compression and tension-strain state, consistent with the first principles calculations, which optimizes the carrier transport. As a result, about 4 times increment of the carrier mobility is found. Moreover, the lattice strain of several nanometers is observed with TEM analysis, which scatters phonon strongly. A lowest κ L value of 0.57 W m −1 K −1 at 673 K is obtained for x = 3 sample, which is close to the amorphous limit. The interactive effect of enhanced mobility and strong scattering of phonons, contributing to a record zT ∼ 0.48 at 673 K for x = 3 sample. Lattice strain engineering is an effective tactic to simultaneously optimize the electrical and thermal transport.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
能源材料
·
半导体物理
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Xinmiao Gai,Jia Qu,Nan Zhang,Cun You,Fuqing Zhang,Tao Lv,Qiang Tao,Pinwen Zhu,Yan Li,Xin Wang
Bi2Ru2O7 is a weak metal pyrochlore with static disorder from lone-pair electrons. The suppression of static disorder can be observed by in situ Raman spectroscopy, and the abnormal turning point in resistivity can be found at high pressure. X-ray photoelectron spectroscopy (XPS) of bismuth and ruthenium, low-temperature magnetic susceptibility, and magnetization curve were studied, indicating that there were different valence states between bismuth and ruthenium. The in situ high-pressure structure evolution and conductivity in Bi2Ru2O7 were investigated up to 30.4 and 32.7 GPa, respectively. The electronic structure evolution was studied by first-principles calculations up to 30.0 GPa. Some of the Raman peaks related to static disorder were suppressed at around 2.5 and 18.0 GPa, respectively. The [RuO6] octahedron was compressed and distorted with pressure, and the triangular distortion increased in the range of 18.0 and 24.4 GPa. The high-pressure resistivity was measured by the four probe method. It slowly decreased at first and then increased slowly after 2.5 GPa due to the effects of static disorder and the applying pressure. After 18.0 GPa, the resistivity increased rapidly because of the pressure-induced lattice distortion, which led to the weakening of the conductivity of the sample under high pressure. All observations showed that the lattice distortion was influenced by the combined effects of static disorder and pressure before 18.0 GPa, which caused the resistivity to decrease first and then increase. As static disorder is suppressed, Bi2Ru2O7 is close to standard pyrochlore and the conductivity after 18.0 GPa, which is consistent with the theoretical calculation results of band gap.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Hanqian Li,Bangzhi Ge,Wenqi Xie,Ruoyan Li,Chao Li,Wanqi Jie,Dongxu Zhang,Yi Qin,Yuan Yu,Chongjian Zhou
Liquid-like thermoelectric materials continuously draw significant attention because of their extraordinary performance. However, liquid-like Cu atoms usually aggregate into clusters, resulting in charge carrier concentration far above the optimized value. Herein, we demonstrate that the dynamic Cu atoms can be homogenized throughout the matrix by a phase-dependent diffusion process. We directly visulized that the typical equilibrium process periodically aggregates Cu atoms into clusters along the grain boundaries, leaving abundant vacancies within the dynamic cation sublattice and thereby causing carrier concentrations that are much higher than the optimal value. We developed a solid-state non-equilibrium quenching process to freeze the homogeneous Cu sublattice in the symmetry cubic phase to ambient environment and removed the unfavorable Cu segregation. This substantially decreases the hole concentration from 1.2 × 1022 cm−3 for the equilibrium sample to 0.8 × 1022 cm-3 for the quenched sample, approaching the calculated optimal value. Notably, the highly uniform Cu sublattice reduces the lattice thermal conductivity to predicted minima of 0.3 W·m−1·K−1 from 300 to 1000 K. The reduced hole concentration and lattice thermal conductivity collectively give rise to a high ZT value of 1.5 at 1000 K, lying in the ballpark of all previously reported stoichiometric copper chalcogenides.
研究领域:
材料科学
·
凝聚态物理
·
纳米技术
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·
IF 9.9
Ni Jing,Shi Zhaoping,Wang Yibo,Yang Jiahao,Wu Hongxiang,Wang Pengbo,Li Kai,Xiao Meiling,Liu Changpeng,Xing Wei
The scale-up deployment of ruthenium (Ru)-based oxygen evolution reaction (OER) electrocatalysts in proton exchange membrane water electrolysis (PEMWE) is greatly restricted by the poor stability. As the lattice-oxygen-mediated mechanism (LOM) has been identified as the major contributor to the fast performance degradation, impeding lattice oxygen diffusion to inhibit lattice oxygen participation is imperative, yet remains challenging due to the lack of efficient approaches. Herein, we strategically regulate the bonding nature of Ru-O towards suppressed LOM via Ru-based high-entropy oxide (HEO) construction. The lattice disorder in HEOs is believed to increase migration energy barrier of lattice oxygen. As a result, the screened Ti 23 Nb 9 Hf 13 W 12 Ru 43 O x exhibits 11.7 times slower lattice oxygen diffusion rate, 84% reduction in LOM ratio, and 29 times lifespan extension compared with the state-of-the-art RuO 2 catalyst. Our work opens up a feasible avenue to constructing stabilized Ru-based OER catalysts towards scalable application.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Acta Metallurgica Sinica-English Letters
·
2025
·
IF 3.9
Yuan Baocheng,Wen Yi,Wang Lei,Li Zhihao,Wang Hong-Chao,Chang Cheng,Zhao Li-Dong
Thermoelectric materials possess tremendous potential in energy regeneration owing to their capacity to produce power directly from heat. SnTe, a lead-free compound, is a prospective thermoelectric material. However, because of its elevated thermal conductivity, the thermoelectric performance of undoped SnTe remains at a low level. In this work, we induce ternary compounds CuFeS 2 into the SnTe matrix by ball milling. We observe the decomposition of CuFeS 2 , which decomposes into FeS, Cu 2 S, and other binary compounds. These newly generated binary compounds form micropores and secondary phases in the matrix. Combined with the natural grain boundaries in the polycrystal, they form all-scale hierarchical structures within the material, resulting in reduced lattice thermal conductivity. Overall, the produced SnTe + 2 wt% CuFeS 2 composites show the peak dimensionless figure of merit ( ZT ) up to 0.33 at 673 K, an increase of ~ 100% compared to the undoped SnTe.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）