Flower-like MoS2 with stepped edge structure efficient for electrocatalysis of hydrogen and oxygen evolution. (8th March 2019)

• Record Type: Journal Article
• Authors: Wang, Anqi; Hu, Kang; Liu, Yuqian; Li, Ruiqi; Ye, Chenlu; Yi, Zixiao; Yan, Kai
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 13(2019)
• Page Start: 6573
• Page End: 6581
• Publication Date: 2019-03-08
• Subjects: Flower-like MoS2 -- Hydrogen and oxygen evolution -- Overpotential -- Durability; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.01.200
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A flower-like MoS2 with a stepped edge structure was successfully and controllably fabricated as a bifunctional electrocatalyst efficient for hydrogen and oxygen evolution reactions. The hierarchically porous polycrystalline MoS2 was characterized by a combination analysis of XRD, Raman, XPS, N2 -BET, SEM and TEM. In the hydrogen evolution reaction (HER), this as-obtained MoS2 /Ni catalyst presents significantly enhanced performance versus most previously studied catalysts. In the oxygen evolution reaction (OER), the electrocatalyst MoS2 /Ni gives rise to a rather low overpotential of ∼0.335 V at 20.0 mA cm −2 and much enhanced durability over 6 h. Highlights: Flower-like MoS2 with a stepped edge structure was controllably fabricated. The prepared MoS2 had a high surface area and a hierarchical porous structure. The prepared MoS2 is efficient at hydrogen and oxygen evolution reactions. In HER, the fabricated electrocatalyst exhibited 162 mV at 10 mA cm −2 . In OER, the electrocatalyst had a low overpotential of 340 mV at 20.0 mA cm −2 .