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Design of MoS2/Graphene van der Waals Heterostructure as Highly Efficient and Stable Electrocatalyst for Hydrogen Evolution in Acidic and Alkaline Media.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-11 , DOI: 10.1021/acsami.0c04838 Xianbo Yu 1 , Guangyu Zhao 2 , Shan Gong 1 , Chao Liu 1 , Canlong Wu 1 , Pengbo Lyu 3 , Guillaume Maurin 3 , Naiqing Zhang 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-11 , DOI: 10.1021/acsami.0c04838 Xianbo Yu 1 , Guangyu Zhao 2 , Shan Gong 1 , Chao Liu 1 , Canlong Wu 1 , Pengbo Lyu 3 , Guillaume Maurin 3 , Naiqing Zhang 2
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The thermodynamically stable phase of molybdenum disulfide (MoS2) is evaluated as a promising and durable nonprecious-metal electrocatalyst toward the hydrogen evolution reaction (HER); however, its actual catalytic activity is restricted by an inert basal plane, low electronic conductivity, low density, and using efficiency of edged atoms. Moreover, 2D/2D van der Waals (vdws) heterostructures (HSs) with face-to-face contact can construct a highly coupled interface and are demonstrated to have immense potential for catalytic applications. In the present work, a 2D/2D hetero-layered architecture of an electrocatalyst, based on the alternate arrangement of ultrasmall monolayer MoS2 nanosheets (approximately 5–10 nm) and ultrathin graphene (G) sheets, is prepared by a facilely chemical process, which is named as MoS2/G HS. The unique structural characteristic of MoS2/G HS is in favor of accommodating more active sites as the centers of ad/desorption hydrogen and transferring and separating the charges at a coupled interface to improve the electronic conductivity and durability. The density functional theory calculation results further confirm that the alternately arranged G layers and MoS2 monolayers, as well as the expanded interplanar distance of 1.104 nm for MoS2/G HS, can exhibit a superior HER performance in both 0.5 M H2SO4 and 1.0 M KOH.
中文翻译：
MoS2 /石墨烯范德华异质结构的设计，作为在酸性和碱性介质中析氢的高效稳定的电催化剂。
二硫化钼（MoS 2）的热力学稳定相被评估为有前途且持久的非贵金属电催化剂，用于放氢反应（HER）。然而，它的实际催化活性受到惰性基底平面，低电子电导率，低密度和有边原子的利用效率的限制。此外，具有面对面接触的2D / 2D范德华（vdws）异质结构（HS）可以构建高度耦合的界面，并被证明具有巨大的催化应用潜力。在当前的工作中，基于超小单层MoS 2的交替排列，电催化剂的2D / 2D杂层结构纳米片（约5–10 nm）和超薄石墨烯（G）片是通过简便的化学过程制备的，称为MoS 2 / G HS。MoS 2 / G HS的独特结构特征是支持容纳更多的活性位点（作为吸附/解吸氢的中心），并在耦合界面处转移和分离电荷，以提高电子导电性和耐久性。密度泛函理论计算结果进一步证实，交替排列的G层和MoS 2单层，以及MoS 2 / G HS的1.104 nm的扩展面间距，在0.5 MH 2 SO 4和0.5 MH 2中均表现出优异的HER性能。1.0 M KOH。
更新日期：2020-05-11
中文翻译：
MoS2 /石墨烯范德华异质结构的设计，作为在酸性和碱性介质中析氢的高效稳定的电催化剂。
二硫化钼（MoS 2）的热力学稳定相被评估为有前途且持久的非贵金属电催化剂，用于放氢反应（HER）。然而，它的实际催化活性受到惰性基底平面，低电子电导率，低密度和有边原子的利用效率的限制。此外，具有面对面接触的2D / 2D范德华（vdws）异质结构（HS）可以构建高度耦合的界面，并被证明具有巨大的催化应用潜力。在当前的工作中，基于超小单层MoS 2的交替排列，电催化剂的2D / 2D杂层结构纳米片（约5–10 nm）和超薄石墨烯（G）片是通过简便的化学过程制备的，称为MoS 2 / G HS。MoS 2 / G HS的独特结构特征是支持容纳更多的活性位点（作为吸附/解吸氢的中心），并在耦合界面处转移和分离电荷，以提高电子导电性和耐久性。密度泛函理论计算结果进一步证实，交替排列的G层和MoS 2单层，以及MoS 2 / G HS的1.104 nm的扩展面间距，在0.5 MH 2 SO 4和0.5 MH 2中均表现出优异的HER性能。1.0 M KOH。
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