Three-Dimensional Heterostructures of MoS2 Nanosheets on Conducting MoO2 as an Efficient Electrocatalyst To Enhance Hydrogen Evolution Reaction

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• 作者：Revannath Dnyandeo Nikam ; Ang-Yu Lu ; Poonam Ashok Sonawane ; U. Rajesh Kumar ; Kanchan Yadav ; Lain-Jong Li ; Yit-Tsong Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：23328-23335
• 全文大小：452K
• ISSN：1944-8252

文摘

Molybdenum disulfide (MoS₂) is a promising catalyst for hydrogen evolution reaction (HER) because of its unique nature to supply active sites in the reaction. However, the low density of active sites and their poor electrical conductivity have limited the performance of MoS₂ in HER. In this work, we synthesized MoS₂ nanosheets on three-dimensional (3D) conductive MoO₂ via a two-step chemical vapor deposition (CVD) reaction. The 3D MoO₂ structure can create structural disorders in MoS₂ nanosheets (referred to as 3D MoS₂/MoO₂), which are responsible for providing the superior HER activity by exposing tremendous active sites of terminal disulfur of S₂^鈥? (in MoS₂) as well as the backbone conductive oxide layer (of MoO₂) to facilitate an interfacial charge transport for the proton reduction. In addition, the MoS₂ nanosheets could protect the inner MoO₂ core from the acidic electrolyte in the HER. The high activity of the as-synthesized 3D MoS₂/MoO₂ hybrid material in HER is attributed to the small onset overpotential of 142 mV, a largest cathodic current density of 85 mA cm^鈥?, a low Tafel slope of 35.6 mV dec^鈥?, and robust electrochemical durability.