Abstract

Molybdenum disulfide (MoS₂) has been considered to be a promising electrocatalyst for hydrogen evolution reaction (HER). Incorporation of 1 T phase is a strategy to allow basal planes of MoS₂ nanosheets simultaneously possess highly active catalytic sites and metallic property. This strategy requires as many basal planes as possible to be exposed to the surface, thus enabling the active sites on the basal planes to participate in the catalytic reaction. Herein, we report a porous ultra-thin 1 T phase MoS₂ (1 T-MoS₂) nanosheets prepared by a SiO₂ nanospheres template method. Ultra-thin MoS₂ nanosheets grow laterally around the surface of SiO₂ nanospheres. After etching SiO₂, the rest porous ultra-thin MoS₂ nanosheets ensure the maximized exposure of basal plane active sites. In addition, the metallic porous structure can also facilitate transport of mass in holes and transfer of electron on basal planes. The synergistic effect of these aspects endows our sample with improved hydrogen evolution capability. The onset overpotential at 1 mA/cm² is 131 mV, and the corresponding Tafel slope is 63 mV/dec.

中文翻译：

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将活性相掺入多孔MoS 2中以增强析氢反应

摘要

二硫化钼（MoS ₂）被认为是有前途的氢析出反应（HER）电催化剂。引入1 T相是一种使MoS ₂纳米片基面同时具有高活性催化位点和金属性能的策略。该策略需要使尽可能多的基础平面暴露于表面，从而使基础平面上的活性位点能够参与催化反应。本文中，我们报道了一种通过SiO ₂纳米球模板法制备的多孔超薄1 T相MoS ₂（1 T-MoS ₂）纳米片。超薄MoS ₂纳米片在SiO ₂表面周围横向生长纳米球。在蚀刻SiO _2之后，其余的多孔超薄MoS ₂纳米片可确保基面活性部位的最大暴露。另外，金属多孔结构还可以促进质量在空穴中的传输和电子在基面上的转移。这些方面的协同作用使我们的样品具有更高的析氢能力。1 mA / cm ²的起始过电势为131 mV，相应的Tafel斜率为63 mV / dec。