ADVANCED MATERIALS
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2025
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IF 26.8
Haoyu Yue,Zhongnan Guo,Wenjing Guo,Ruonan Yao,Shuang Zhen,Qiansu Ma,Ming Chen,Jiawei Lin,Wenxia Yuan
The high-entropy strategy offers a viable pathway to activate the inert basal plane of transition metal dichalcogenides (TMDs) for electrocatalysis. This work demonstrates that the “lattice distortion effect”, one of the core effects of high-entropy materials, plays a crucial role in activating the basal plane of TMDs. A high-entropy diselenide (ReNbTaMoW)Se 2 (denoted as HESe 2 ) is synthesized via solid-state reaction. Single-crystal X-ray diffraction and atomic resolution scanning transmission electron microscopy reveal a unique fivefold-modulated structure in HESe 2 , which unexpectedly distorts the rigid trigonal prismatic motif. HESe 2 exhibits exceptional activity for hydrogen evolution reaction (HER), showing a low overpotential of 31 mV at a current density of 10 mA cm −2 , comparable to state-of-the-art precious metal catalysts. In situ X-ray photoelectron spectroscopy indicates that the distorted structure of HESe 2 remains stable during the HER process. A proton exchange membrane (PEM) electrolyser assembled with HESe 2 cathodic catalyst shows competitive performance and durability with negligible degradation over 400 h. Density functional theory calculations reveal the electron accumulation regions induced by lattice distortion as high-activity sites, thereby driving the augmented HER performance of HESe 2 . This work presents a universal strategy for boosting the basal plane activity of layered materials through unique lattice distortion effect.
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高影响因子
RSC Advances
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2025
·Vol. 15
·期 7
·5242-5251
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IF 4.6
Qiyuan Zhang,Ruoming Du,Aihua Yao
Recent advances in hydrated tungsten oxides (WO3·nH2O, n = 1, 2) have highlighted their potential for dual-band electrochromic applications. However, achieving both high optical modulation and robust cycling stability remains a challenge. This study presents a cost-effective and straightforward cathodic electrodeposition method to fabricate amorphous tungsten oxide dihydrate (WO3·2H2O) films using a precursor solution primarily composed of monomeric diperoxotungstate. The open framework and interlayer structural water in WO3·2H2O enable exceptional dual-band electrochromic performance at super-low switching potentials (−0.5 V for full coloration and 0.5 V for full bleaching) in a 1.0 M LiClO4/propylene carbonate (LiClO4/PC) electrolyte. Key features include high optical modulation (∼92% at 633 nm and ∼86% at 1100 nm), fast response times (17.5 s for bleaching and 18.1 s for coloration at 633 nm; 5.0 s for bleaching and 7.1 s for coloration at 1100 nm), high coloration efficiencies (204.2 cm2 per C at 1100 nm and 72.3 cm2 per C at 633 nm), and exceptional cycling stability (retaining 94% of initial optical modulation after 2000 cycles and 76% after 10 000 cycles at 633 nm). The interlayer water in WO3·2H2O plays a critical role in facilitating pseudocapacitive Li+ intercalation, enabling control over optical properties across the visible and near-infrared (NIR) regions while maintaining structural integrity. Additionally, the scalability of the method was demonstrated through the successful fabrication of large-area films (10 cm × 10 cm) and prototype electrochromic devices.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Yu Fang,Zheng Tang Cai,Ze Wei Zhu,Jia Hao Ma,Hong Kai Cai,Han Li
SnTe has attracted significant attention as a promising thermoelectric material due to its favorable band structure and low cost. However, its high intrinsic hole concentration and thermal conductivity still hinder further performance enhancement. In this study, a series of Sn 2.9-x W x Te 2.9 –(In 2 Te 3 ) 0.03 –(Cu 2 Te) 0.18 (x = 0, 0.03, 0.06, 0.09, 0.12, 0.15) composites were synthesized by incorporating in-situ formed In 2 Te 3 and Cu 2 Te nanophases along with W doping. Structural and microstructural analyses confirmed the formation of uniformly distributed nanoinclusions (10–20 nm) and homogeneous elemental distribution. W doping effectively suppressed intrinsic Sn vacancies and induced valence band convergence, while the introduction of In created resonant states. These synergistic effects significantly enhanced the Seebeck coefficient. Moreover, multiscale phonon scattering arising from nanophases, dislocations, and lattice distortions greatly reduced the lattice thermal conductivity. The sample with x = 0.09 exhibited a maximum power factor of 25.98 μW·cm −1 ·K −2 , while the sample with x = 0.12 achieved a minimum lattice thermal conductivity of 0.406 W·m −1 ·K −1 . As a result, the optimized composition reached a peak ZT of 1.23 and an average ZT of 0.44 at 823 K, representing improvements of approximately 209 % and 215 % over pristine SnTe, respectively. These results place the material among the top-performing SnTe-based thermoelectric systems reported to date.
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高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 8
·722
·
IF 4.4
Zhengtang Cai,Kaipeng Zheng,Chun Ma,Yu Fang,Yuyang Ma,Qinglin Deng,Han Li
Compared to SnTe and PbTe base materials, the GeTe matrix exhibits a relatively high Seebeck coefficient and power factor but has garnered significant attention due to its poor thermal transport performance and environmental characteristics. As a typical p-type IV–VI group thermoelectric material, W-doped GeTe material can bring additional enhancement to thermoelectric performance. In this study, the introduction of W, Ge1−xWxTe (x= 0, 0.002, 0.005, 0.007, 0.01, 0.03) resulted in the presence of high-valence state atoms, providing additional charge carriers, thereby elevating the material’s power factor to a maximum PFpeakof approximately 43 μW cm−1K−2, while slightly optimizing the Seebeck coefficient of the solid solution. Moreover, W doping can induce defects and promote slight rhombohedral distortion in the crystal structure of GeTe, further reducing the lattice thermal conductivityκlatto as low as approximately 0.14 W m−1K−1(x= 0.002 at 673 K), optimizing it to approximately 85% compared to the GeTe matrix. This led to the formation of a p-type multicomponent composite thermoelectric material with ultra-low thermal conductivity. Ultimately, W doping achieves the comprehensive enhancement of the thermoelectric performance of GeTe base materials, with the peak ZT value of sample Ge0.995W0.005Te reaching approximately 0.99 at 673 K, and the average ZT optimized to 0.76 in the high-temperature range of 573–723 K, representing an increase of approximately 17% compared to pristine GeTe within the same temperature range.
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高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
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2025
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IF 3.1
Jianping Mu,Ran Hai,Yupeng Yang,Mingzhe Zhao,Cong Li,Ding Wu,Hongbin Ding
Tungsten impurities deposited on the plasma-facing components (PFCs) of the inner walls of tokamak devices pose a significant risk to steady-state operation and safety. Nevertheless, a quantitative chemical analysis of the co-deposited layer on PFCs is a critical task. Laser-induced breakdown spectroscopy (LIBS) is a promising technique for assessing the deposition of impurities on PFCs, enabling in-situ monitoring, real-time analysis, and simultaneous detection of all elements. However, the accuracy of the quantitative analysis is affected by the effects of the material matrix. Diffuse reflectance spectroscopy (DRS) provides complementary information about the material matrix, such as optical properties. Herein, we present a novel data fusion model of LIBS and DRS techniques, providing more accurate results compared to the models based on each of these single methods. 66 standard samples were prepared to simulate the impurities deposited on PFCs in EAST. 15 samples were randomly selected as prediction set, while the remaining 51 samples were used as calibration set. The average relative errors of the data fusion model for W, Li, Fe, and O were 2.23, 1.95, 2.08, and 0.39%, respectively. Compared with the single LIBS data model, the root mean square errors of prediction(RMSEP) of four elements W, Fe, Li, and O in the data fusion model are reduced by 19.4, 18.5, 21.4, and 20.9%, respectively. The results show that the fusion of LIBS and DRS data enables an improved quantitative analysis of co-deposited impurities on PFCs.
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