W–N/C@Co9S8@WS2-hollow carbon nanocage as multifunctional electrocatalysts for DSSCS,ORR and OER
Electrochimica Acta(2020)
Abstract
Due to the unique characteristics like large specific surface area of Transition Metal Dichalcogenides (TMDs) and its well-defined hollow Metal-Organic Framework (MOF), it is widely used in dye-sensitized solar cells (DSSCs), oxygen reduction (ORR) and oxygen evolution reaction(OER). Herein, we prepare N-doped C hollow metal organic frame structure materials, which are used as a template, WS2 nanocrystals are grown and encapsulated in MOF with interfacial W–N coupling centers. During the pyrolysis, after carbonizing, ZIF-67 becomes Co, N-doped C materials, and the growth of WS2 is effectively suppressed, creating multi-functional groups W–N/C@Co9S8@WS2 materials. The synthesized material is employed as a counter electrode (CE) for dye-sensitized solar cells, its high power conversion efficiency (PCE) (7.38%) based DSSC under AM 1.5G irradiation was much more than that of Pt (7.06%). Such excellent electrocatalytic performance was resulted from the unique frame pore structure, the synergistic effect of WS2, Co9S8 and W–N multi-functional groups. Besides, W–N/C-4@Co9S8@WS2 shows E1/2≈0.84 V and a little Tafel slope of 44 mVdec−1 when employed as electrocatalysts for ORR and potential ≈ 1.79 V to achieve the current density of 10 mA cm−2, which are lower than that of Pt/C ≈ 1.91 V catalysts in 0.1 M KOH.
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Key words
Metal-organic framework,Oxygen reduction,Oxygen evolution reaction,Transition metal dichalcogenides,Dye-sensitized solar cells
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