JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 2
·117772
·
IF 6.2
Jingdan Lei,Chunhui Wang,Xiaoyun Yang,Xiwei Zhang,Di Yuan,Xu-Jin Ge,Shike Zhang,Gui Yang,Chao Wang
AgCuTe has attracted significant interest due to their superior electrical and thermal transport characteristics. In this work, we focuses on investigating the effects of Se and S solid solution on AgCuTe thermoelectric properties. A series of AgCu(Te, Se, S) solid solutions were synthesized via melting reaction. We found these compositions effectively inhibited the typical hexagonal-to-cubic phase transition and showed features of secondary phase segregation, such as Ag 2 Te, Cu 2 Te, and Cu 2 S. These nano- to microscale chemistry fluctuations significantly affect the thermoelectric transport properties, particularly thermal transport, resulting in an exceptional low lattice thermal conductivity of 0.19 W m −1 K −1 , which was approaching the amorphous limits. Consequently, a maximum figure of merit zT up to 1.4 was obtained at 723 K for AgCuTe 0.65 Se 0.1 S 0.25 sample. This work investigates the relationships between composition, structure, and thermoelectric properties of AgCuTe, providing substantial support for the further development of high-performance AgCuTe-based materials.
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Nature Communications
·
2025
·Vol. 16
·期 1
·7484
·
IF 15.7
Xie Liangjun,Tong Haoyang,Peng Guyang,Wu Hao,Shi Wenjing,Yu Kuai,Hu Jinsuo,Jiao Lei,Dong Xingyan,Guo Fengkai,Cai Wei,Zhang Yang,Wu Haijun,Liu Zihang,Sui Jiehe
Carrier mobility has conventionally been manipulated to enhance thermoelectric performance by reducing crystal defects. Therefore, an effective strategy for optimizing carrier mobility is highly desired for nanostructured materials. In this work, InSb nanoprecipitates are formed in situ within the nanostructured MgAgSb matrix, serving as channels for accelerating charge carriers. A high carrier mobility of 93.1 cm 2 V -1 s -1 is achieved in MgAg 0.97 Sb 0.99 -0.02InSb composite at 300 K, resulting in an average power factor of 23.8 μW cm -1 K -2 from 300 K to 553 K. To address the efficiency degradation caused by the narrow operational temperature range of MgAgSb, a two-pair segmented thermoelectric module is developed. A high conversion efficiency of 12.4% is achieved under a cold-side temperature of ~293 K and a temperature difference of ~540 K, presenting an effective strategy for carrier mobility optimization and opening new avenues for medium-temperature waste heat harvesting using MgAgSb.
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PubMed
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Small
·
2025
·
IF 12.1
Jie Huang,Kangpeng Jin,Chen Li,Hao Yang,Yiming Zhang,Xiyang Wang,Ming Huang,Zhen-Hua Ge,Liangwei Fu
Maximizing the average figure-of-merit ( ZT avg ) of thermoelectric (TE) materials is crucial for optimizing the module performance. Herein, this work enhances the ZT avg to 1.42 (298–673 K) in a n-type Mg 3 (Sb, Bi) 2 -based material by a stepwise optimization strategy. Specifically, Cr injects electron into Mg 3 Sb 0.8 Bi 1.19 Te 0.01 , which synergistically boosts carrier concentration and forms an electron accumulation layer at the interface. Meanwhile, lattice softening and interfacial scattering suppress lattice thermal conductivity. A peak ZT of 1.72 at 673 K and ZT avg of 1.30 over 298–673 K are achieved for Mg 3 Sb 0.8 Bi 1.19 Te 0.01 –1.5 wt.% Cr. Then, through grain refinement and Se doping instead of Te, a delicate equipoise is reached between the power factor and the electronic thermal conductivity. Eventually, the Mg 3 Sb 0.8 Bi 1.19 Se 0.01 –1.5 wt.% Cr sample obtains an outstanding ZT of ≈1.9 at 573 K and ZT avg of 1.42 over 298–673 K. The integrated two-pair full-Zintl YbZn 2 Sb 2 /Mg 3 (Sb, Bi) 2 module achieves a high conversion efficiency of 10.5% and power density of 0.37 W cm −2 simultaneously under a temperature difference of 370 K. More importantly, this module exhibits excellent thermal stability during a 10-day in situ test. This work provides new ideas for applications of full-Zintl modules to the recovery of waste heat.
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Advanced Electronic Materials
·
2025
·Vol. 11
·期 15
·e00192
·
IF 5.3
Yikang Li,Dazhi Wang,Yiwen Feng,Chang Liu,Xu Chen,Zefei Li,Xiangji Chen,Ran Zhang,Xiaopeng Zhang,Shiwen Liang,Liujia Suo,Weiwei Li,Guo Liu,Jifei Liu,Tiesheng Wang
Directional acoustic sensing can be used for localization and detection, has a wide range of applications in various fields, including rescue robotics, drone positioning, and underwater navigation. It is, however, a challenge to sense both the amplitude and direction of the acoustic waves with a simple sensor design. In this paper, a series of artificial cilia is prepared using additive micro-manufacturing technologies for direction-sensitive acoustic sensing, including electrospray and 3D micro-direct ink writing. The response of the artificial cilia at resonance is significantly enhanced, while the resonance frequencies decrease with increasing length, and the response increases due to the amplification. Two resonances are achieved on a cilium by printing two independent electrode-to-electrode interconnect bridges. Two signal channels of the artificial cilia produce an ‘8’-shaped loop by varying acoustic excitation angles, showing that both amplitude ratio and phase difference are direction-dependent. The two voltages of the artificial cilia can be decoupled to produce different frequencies, amplitudes, and phase differences, thus enabling directional detection of multiple sound sources. The direction-sensitive acoustic sensing is achieved by micro-manufacturing artificial cilia. This effort opens an avenue in the fields of cochlear and device detection with promising applications.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2025
·
IF 7
Wei Feng,Jian Zhang,Ruxia Liu,Yong Xiao,Guoqiang Luo,Qiang Shen
Particle-reinforced composite fillers allow precise control of joint microstructure to enhance mechanical performance. However, traditional designs often reduce joint deformability and face issues like particle agglomeration and poor interfacial wettability. To overcome these limitations, a micro-network of Cu-Ti reinforcements within the brazing seam via Ag- x TiH 2 composite filler was developed in this work, which enabled the fabrication of high-strength Si 3 N 4 /Cu joints. Optimal results were achieved with the Ag-4TiH 2 filler, wherein a eutectic liquid formed at the Ag-4TiH 2 /Cu interface during the initial brazing stage. Simultaneously, undissolved Ti reacts with Cu to yield submicron Cu 4 Ti 3 -dominated reinforcements. On the Si 3 N 4 surface, hypostoichiometric TiN/TiN 0 . 61 /TiN 0 . 5 nanocrystals grow sequentially, which is beneficial for enhancing interfacial wettability and bonding reliability. A maximum average shear strength of 186.9 MPa was obtained, a 57.6 % improvement over the conventional AgCuTi filler. The fracture mechanism underwent a notable transformation: brittle failure at mixed regions of Si 3 N 4 and the reaction layer in AgCuTi joints was replaced by ductile failure at the interface between the Cu matrix and the brazing seam in Ag-4TiH 2 joints. The Cu 4 Ti 3 -dominated micro-network offers distinct advantages by enabling controllable in-situ growth that prevents agglomeration while maintaining joint deformability through the synergy effect of the abundant retention of ductile Ag(s, s) and decent elastic modulus and yield strength increment, and regulates the interface reaction to yield a thinner Ti-N layer instead of a TiN/Ti 5 Si 3 dual-layer. These features collectively contribute to the notable mitigation of residual stress within Si 3 N 4 /Cu joints.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yilin Zhao,Fangwei Liu,Jingbo Hu,Yang Yang,Jianzhou Wu,Shihui Zou,Jie Fan
The Mn–Na2WO4/SiO2 catalyst for oxidative coupling of methane (OCM) is highly appealing and promising but its high light-off temperature (>800 °C) hinders its industrial application. Engineering catalysts for efficient catalytic performance is attractive yet challenging. In this study, we demonstrate that the incorporation of small amounts of silver into the Mn–Na2WO4/SiO2 catalyst significantly improves its performance, achieving a C2 yield of up to 20% at 750 °C. Characterization results indicate that silver facilitates O2 activation and promotes C–H bond activation, thereby further enhancing CH4 conversion. The findings offer valuable insights into advancing the design concept of high-performance OCM catalysts.
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