CO 2到CH 4的电还原是非常需要的,具有挑战性的研究课题。在这项研究中,报道了一种电催化系统,该系统包括超薄MoTe 2层和离子液体电解质,用于将CO 2还原为甲烷,可有效提供法拉第效率为83±3%的甲烷(类似于已报道的最佳铜基催化剂)到目前为止),并在25.6 mA cm -2(-1.0 V RHE)的相对较高的电流密度下具有超过45小时的持久活性。获得的结果可以促进对其他过渡金属二卤化二硫化物电催化剂设计的研究,该催化剂用于将CO 2还原为有价值的燃料。
Standard molar enthalpy of formation at 298.15 K of the β-modification of molybdenum ditelluride
作者:P.A.G. O'Hare、G.A. Hope
DOI:10.1016/0021-9614(89)90051-7
日期:1989.7
Abstract Fluorine-combustion calorimetry of a high-purity sample of molybdenum ditelluride has yielded the standardmolarenthalpy of formation: ΔfHmo MoTe2, cr, β, 298.15K) = −(84.2 ± 4.6) kJ·mol−1. At 298.15K, the enthalpy of the hypothetical β-to-α transition in MoTe2 is approximately −6 kJ·mol−1. The present result for ΔfHmo(MoTe2) has been combined with literature values for the decomposition
diffraction and wavelength dispersive spectroscopy indicate that both S and Te successfully substitute for Se and exhibit a low solubility limit of y ≈ z ≈ 0.5. Measurements of the thermoelectric properties between 2 and 800 K show that S and Te substitutions tend to lead to a more pronounced heavily-doped character with respect to Ag3.8Mo9Se11. The very low lattice thermal conductivity of these compounds
摘要 我们详细研究了 S 和 Te 取代 Se 对簇化合物 Ag3.8Mo9Se11 的热电性能的影响。两个系列的多晶样品 Ag3.8Mo9Se11-ySy (0 ≤ y ≤ 0.5) 和 Ag3.8Mo9Se11-zTez (0 ≤ z ≤ 0.5) 是通过结合常规粉末冶金技术和放电等离子烧结合成的。粉末 X 射线衍射和波长色散光谱表明 S 和 Te 都成功地替代了 Se,并且表现出 y ≈ z ≈ 0.5 的低溶解度极限。对 2 到 800 K 之间的热电特性的测量表明,S 和 Te 取代倾向于导致相对于 Ag3.8Mo9Se11 更明显的重掺杂特性。这些化合物的晶格热导率非常低 (κ L ≈ 0. 5 W m-1 K-1) 可归因于 Ag 原子的大热位移参数。尽管样品具有重掺杂的性质,但电荷载流子传导的热量比 Wiedemann-Franz 定律预期的要少,导致洛伦兹数比 300 K
The in-built bionic “MoFe cofactor” in Fe-doped two-dimensional MoTe<sub>2</sub> nanosheets for boosting the photocatalytic nitrogen reduction performance
The bionic “MoFe cofactor” in 2D Fe–MoTe2 effectively facilitates the transport and separation of photogenerated carriers by one- and two-electron redox reactions.
as-synthesized and exfoliated tellurides were characterized in detail and investigated for potential application in electrocatalysis. The inherent electrochemical activity related to both cation and anion was observed. This is dominantly related to the oxidation tendency of tellurium. The MoTe2 and WTe2 show significantly contrasting properties toward the hydrogen evolution reaction, where MoTe2 shows highly
Grain boundary conductivity in different polycrystalline MoSe<sub>2</sub> thin films
作者:J. C. Bernede、J. Pouzet、R. Le Ny、T. Ben Nasrallah
DOI:10.1051/jp3:1994158
日期:1994.4
Abstract It has been shown early that curved plots for the conductivity of polycrystalline diselenide molybdenum were systematically obtained whatever the technique used for the obtention of the layers. In the general case of polycrystalline semiconductors these deviations from the simple thermoionic emission across the grain boundaries have been recently attributed to potential fluctuations at the grain boundaries. Here a good agreement between the experimental results and this new theory is obtained. The result deduced from theoretical propositions is conforted by the scanning electron micrographs of the layers and other preceeding experimental studies. In the light of the discussion of the MoSe 2 layers, a quality factor Q is proposed for photovoltaic thin films. This estimation shows that the films obtained by solid state reaction and substitution are the best. Mo and Te thin films are sequentially deposited. Then an annealing under Se and Te pressure at 770 K for 24 h gives crystallized and stoichiometric MoSe 2 thin films. These films have the higher quality factor among the films studied here (Q = 0.75). This is in close agreement with the good electrical and optical properties of these layers.
摘要 早期研究表明,无论采用何种技术获得多晶二硒化钼层,都能系统地获得其电导率曲线图。在多晶半导体的一般情况下,这些跨晶界的简单热离子发射偏差最近被归因于晶界的电位波动。在这里,实验结果与这一新理论之间取得了很好的一致。 层的扫描电子显微照片和之前的其他实验研究证实了理论推导的结果。根据对 MoSe 2 层的讨论,提出了光伏薄膜的质量因子 Q。这一估算结果表明,通过固态反应和置换获得的薄膜是最好的。Mo 和 Te 薄膜依次沉积。然后在 770 K 的 Se 和 Te 压力下退火 24 小时,得到结晶的、共计量的 MoSe 2 薄膜。在本文研究的薄膜中,这些薄膜的品质因数较高(Q = 0.75)。这与这些薄膜良好的电学和光学特性十分吻合。