共查询到20条相似文献，搜索用时 15 毫秒
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Shulin Bai Jingyi Zhang Mengxiu Wu Dongming Luo Da Wan Xiaodong Li Shuwei Tang 《Small Methods》2023,7(3):2370015
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Shulin Bai Jingyi Zhang Mengxiu Wu Dongming Luo Da Wan Xiaodong Li Shuwei Tang 《Small Methods》2023,7(3):2201368
Inspired by the experimental achievement of layered LaCuOX (X = S, Se) with superior thermoelectric (TE) performance, the TE properties of Ag-based isomorphic LaAgOX are systemically investigated by the first-principles calculation. The LaAgOS and LaAgOSe are direct semiconductors with wide bandgaps of ≈2.50 and ≈2.35 eV. Essential four-phonon and multiple carrier scattering mechanisms are considered in phonon and electronic transport calculations to improve the accuracy of the figure-of-merit (ZT). The p-type LaAgOX (X = S, Se) shows excellent TE performance on account of the large Seebeck coefficient originated from the band convergency and low thermal conductivity caused by the strong phonon–phonon scattering. Consequently, the optimal ZTs along the out-of-plane direction decrease in the order of n-type LaAgOSe (≈2.88) > p-type LaAgOSe (≈2.50) > p-type LaAgOS (≈2.42) > n-type LaAgOS (≈2.27) at 700 K, and the optimal ZTs of ≈1.16 and ≈1.29 are achieved for p-type LaAgOS and LaAgOSe at the same temperature. The present work would provide a deep insight into the phonon and electronic transport properties of LaAgOX (X = S, Se), but also could shed light on the way for the rational design of state-of-the-art heteroanionic materials for TE application. 相似文献
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Potassium-ion hybrid capacitors (PIHCs) have attracted considerable attention as emerging electrochemical energy storage devices for simultaneously achieving high energy and power density, which the key to success is the development of compatible electrode materials for both battery-type anode and capacitive cathode. Among numerous electrode materials, transition metal compounds (including oxides, chalcogenide, carbides, and nitrides) show great potential owing to their high theoretical capacity to achieve high energy density, but their sluggish reaction kinetics restrict the attainable power density. Hence, in the last few years, different strategies are proposed to improve the performance of transition metal compounds as electrode materials for PIHCs, and significant progress is achieved. Herein, this review outlines recent advances of employing transition metal compounds as electrode materials for PIHCs. The performance and challenges of different transition metal compounds are discussed in detail. Finally, the future prospects of practical applications of transition metal compounds in PIHCs are briefly discussed. 相似文献
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Tao Ling Tong Zhang Binghui Ge Lili Han Lirong Zheng Feng Lin Zhengrui Xu Wen‐Bin Hu Xi‐Wen Du Kenneth Davey Shi‐Zhang Qiao 《Advanced materials (Deerfield Beach, Fla.)》2019,31(16)
The practical scale‐up of renewable energy technologies will require catalysts that are more efficient and durable than present ones. This is, however, a formidable challenge that will demand a new capability to tailor the electronic structure. Here, an original electronic structure tailoring of CoO by Ni and Zn dual doping is reported. This changes it from an inert material into one that is highly active for the hydrogen evolution reaction (HER). Based on combined density functional theory calculations and cutting‐edge characterizations, it is shown that dual Ni and Zn doping is responsible for a highly significant increase in HER activity of the host oxide. That is, the Ni dopants cluster around surface oxygen vacancy of the host oxide and provide an ideal electronic surface structure for hydrogen intermediate binding, while the Zn dopants distribute inside the host oxide and modulate the bulk electronic structure to boost electrical conduction. As a result, the dual‐doped Ni, Zn CoO nanorods achieve current densities of 10 and 20 mA cm?2 at overpotentials of, respectively, 53 and 79 mV. This outperforms reported state‐of‐the‐art metal oxide, metal oxide/metal, metal sulfide, and metal phosphide catalysts. 相似文献
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Jinchang Xu;Jiaxi Ruan;Yongqi Jian;Jiayu Lao;Zilong Li;Fangyan Xie;Yanshuo Jin;Xiang Yu;Ming-Hsien Lee;Zhenyou Wang;Nan Wang;Hui Meng; 《Small (Weinheim an der Bergstrasse, Germany)》2024,20(11):2305905
To overcome the low efficiency of overall water splitting, highly effective and stable catalysts are in urgent need, especially for the anode oxygen evolution reaction (OER). In this case, nickel selenides appear as good candidates to catalyze OER and other substitutable anodic reactions due to their high electronic conductivity and easily tunable electronic structure to meet the optimized adsorption ability. Herein, an interesting phase transition from the hexagonal phase of NiSe (H-NiSe) to the rhombohedral phase of NiSe (R-NiSe) induced by the doping of cobalt atoms is reported. The five-coordinated R-NiSe is found to grow adjacent to the six-coordinated H-NiSe, resulting in the formation of the H-NiSe/R-NiSe heterostructure. Further characterizations and calculations prove the reduced splitting energy for R-NiSe and thus the less occupancy in the t2g orbits, which can facilitate the electron transfer process. As a result, the Co2-NiSe/NF shows a satisfying catalytic performance toward OER, hydrogen evolution reaction, and (hybrid) overall water splitting. This work proves that trace amounts of Co doping can induce the phase transition from H-NiSe to R-NiSe. The formation of less-coordinated species can reduce the t2g occupancy and thus enhance the catalytic performance, which might guide rational material design. 相似文献
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综述了近年来国内外锂离子电池层状正极材料中具有协同作用的Ni、Co、Mn三元过渡金属氧化物的研究现状，摘要归纳了这种三元复合型层状正极材料的新型制备方法及其各种方法的特点，以及元素的不同配比变化对材料综合电化学性能及结构的影响，并阐述了其发展方向。 相似文献
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Miao Wang Chung‐Li Dong Yu‐Cheng Huang Yanrui Li Shaohua Shen 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(35)
Non‐noble metal catalysts for high‐active electrocatalytic oxygen evolution reaction (OER) are essential in large‐scale application for water splitting. Herein, tricomponent metal phosphides with hollow structures are synthesized from cobalt‐contained metal organic frameworks (MOFs), i.e., ZIF‐67, by tailoring the feeding ratios of Ni and Fe, followed by a high‐temperature reduction and a subsequent phosphidation process. Excellent OER activity and long‐time stability are achieved in 1 m NaOH aqueous solution, with an overpotential of 329 mV at 10 mA cm?2 and Tafel slope of 48.2 mV dec?1, even superior to the noble metal‐based catalyst. It is evidenced that the formed (oxyhydr)oxide/phosphate species by in situ electrochemical surface oxidation are responsible for active OER. Accordingly, the simultaneous introduction of external Ni and Fe elements significantly influences the electronic structures of the parent metal phosphides, leading to the in situ electrochemical formation of surface active layer with decreased OER activation energy for greatly improved water oxidation performance. This electronic structure tuning strategy by introducing multicomponent metals demonstrates a versatile method to use MOFs as precursors for synthesizing high‐efficient water splitting electrocatalysts. 相似文献
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Xinsheng Wang Zhigang Song Wen Wen Haining Liu Juanxia Wu Chunhe Dang Mongur Hossain Muhammad Ahsan Iqbal Liming Xie 《Advanced materials (Deerfield Beach, Fla.)》2019,31(45)
Layered materials with phase transitions, such as charge density wave (CDW) and magnetic and dipole ordering, have potential to be exfoliated into monolayers and few‐layers and then become a large and important subfamily of two‐dimensional (2D) materials. Benefitting from enriched physical properties from the collective interactions, long‐range ordering, and related phase transitions, as well as the atomic thickness yet having nondangling bonds on the surface, 2D phase‐transition materials have vast potential for use in new‐concept and functional devices. Here, potential 2D phase‐transition materials with CDWs and magnetic and dipole ordering, including transition metal dichalcogenides, transition metal halides, metal thio/selenophosphates, chromium silicon/germanium tellurides, and more, are introduced. The structures and experimental phase‐transition properties are summarized for the bulk materials and some of the obtained monolayers. In addition, recent experimental progress on the synthesis and measurement of monolayers, such as 1T‐TaS2, CrI3, and Cr2Ge2Te6, is reviewed. 相似文献
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多壳层中空金属氧化物具有优异的物理和化学特性。其内部空腔及多壳层结构使其具有大的比表面积,为电化学反应提供了更多的活性位点,因此多壳层中空金属氧化物在电化学领域得到了广泛的应用。本文主要介绍了多壳层中空金属氧化物的合成进展,通过硬模板法、软模板法、选择性刻蚀法和热分解法为例,详细描述了制备得到的不同元素组成、不同壳层数的中空金属氧化物,总结了多壳层中空金属氧化物在超级电容器、锂离子电池和传感器领域表现出的优异性能,最后对多壳层中空金属氧化物的应用前景进行了展望。 相似文献
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At room temperature, two different morphological nanoscaled BiOxF3 − 2x (BiOF nanosheets and Bi26O38F2 nanorods) have been prepared via a simple solution-based route in the presence of diethanolamine (DEA) and NaOH. The compositions and morphologies of bismuth oxyfluoride can be selectively prepared by varying the type of additives. The products were characterized by X-ray diffraction (XRD), energy-disperse X-ray analysis (EDXA), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray photoelectron spectrum (XPS). A possible mechanism was introduced to explain the formation of the products. 相似文献
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C. Zhang Y. Song F.E. Kühn Y. Wang X. Xin W.A. Herrmann 《Advanced materials (Deerfield Beach, Fla.)》2002,14(11):818-822
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《Advanced Materials Interfaces》2017,4(20)
Misfit layer compounds consist of two sublattices that are incommensurately modulated. These sublattices have the structures of cubic monochalcogenide and transition‐metal dichalcogenide monolayers. In this work, a semiconducting misfit layer compound (LaS)1. 20CrS2 is synthesized by chemical vapor transport. In absence of intervening LaS layers, a CrS2 layer does not exist in a stable state. Using thin flakes of (LaS)1. 20CrS2 obtained by mechanical exfoliation, field‐effect transistors are fabricated. The devices show n‐type transport characteristics. An on/off ratio of ≈250 (at 120 K) and mobility of 0.3 cm2 V−1 s−1 (at room temperature) are observed. Temperature dependence of the conductance obeys thermal activation with the activation energy nearly linearly dependent on the gate voltage. This gate‐voltage dependence suggests that the density of trap states is considerably larger than that of MoS2 thin flakes. 相似文献