title: Three-Dimensional Heterostructures of MoS2 Nanosheets on Conducting MoO2 as an Efficient Electrocatalyst To Enhance Hydrogen Evolution Reaction.
abstract: 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(-2) (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(-2), a low Tafel slope of 35.6 mV dec(-1), and robust electrochemical durability.
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.|Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 106, Taiwan.|Nanoscience and Technology Program, Taiwan International Graduate Program, Academia Sinica , Taipei 115, Taiwan.
authors.forename: Revannath Dnyandeo
authors.initials: RD
authors.lastname: Nikam
authors.affiliation: Division of Physical Science & Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Ang-Yu
authors.initials: AY
authors.lastname: Lu
authors.affiliation: Institute of Chemistry, Academia Sinica , Taipei 115, Taiwan.|Department of Applied Chemistry, National Chiao-Tung University , Hsinchu 300, Taiwan.
authors.forename: Poonam Ashok
authors.initials: PA
authors.lastname: Sonawane
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.|Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 106, Taiwan.|Nanoscience and Technology Program, Taiwan International Graduate Program, Academia Sinica , Taipei 115, Taiwan.
authors.forename: U Rajesh
authors.initials: UR
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.|Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 106, Taiwan.|Nanoscience and Technology Program, Taiwan International Graduate Program, Academia Sinica , Taipei 115, Taiwan.
authors.forename: Kanchan
authors.initials: K
authors.lastname: Yadav
authors.affiliation: Division of Physical Science & Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.|Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 106, Taiwan.
authors.forename: Yit-Tsong
authors.initials: YT
authors.lastname: Chen
keywords: 3D MoO2 conductive core; 3D heterostructures; CVD growth; MoS2 nanosheets; electrocatalyst; hydrogen evolution reaction