Molybdenum Polysulfide Anchored on Porous Zr-Metal Organic Framework To Enhance the Performance of Hydrogen Evolution Reaction

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• 作者：Xiaoping Dai ; Mengzhao Liu ; Zhanzhao Li ; Axiang Jin ; Yangde Ma ; Xingliang Huang ; Hui Sun ; Hai Wang ; Xin Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：120
• 期：23
• 页码：12539-12548
• 全文大小：698K
• 年卷期：0
• ISSN：1932-7455

文摘

Replacement of precious platinum with efficient and low-cost catalysts for electrocatalytic hydrogen evolution reaction (HER) at low overpotentials holds tremendous promise for clean energy devices. Herein, molybdenum polysulfide (MoS_x) anchored on a porous Zr-metal organic framework (Zr-MOF, UiO-66-NH₂) by chemical interactions is fabricated by a facile and one-pot solvothermal method for HER application. The distinctive design of the Zr-MOF stabilized MoS_x composite enables remarkable electrochemical HER activity with a Tafel slope of 59 mV·dec^–1, a lower onset potential of nearly 125 mV, and a cathode current of 10 mA·cm^–2 at an overpotential of 200 mV, which also exhibits excellent durability in an acid medium. The superior HER performance should ascribe to the fast electron transport from the less conducting MoS_x nanosheets to the electrode, high effective surface area, and number of active sites, as well as the favorable delivery for local protons in the porous Zr-MOF structure during the electrocatalytic reaction. Thus, this work paves a potential pathway for designing efficient Mo-based HER electrocatalysts by the combination of molybdenum polysulfide and versatile proton-conductive MOFs.