Journal
CHEMICAL ENGINEERING JOURNAL
Volume 368, Issue -, Pages 202-211Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.179
Keywords
Ni-Co-MoSx BHSs; Ball-in-ball hollow nanosphere; M-glycerol precursors; Electrocatalytic performance; Dye-sensitized solar cells; Hydrogen evolution
Categories
Funding
- National Natural Science Foundation of China [21702031]
- Natural Science Foundation of Fujian Province [2018J01692]
- Hong Kong Scholars Program [XJ2018023]
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Multi-shelled micro-/nanomaterials with complex hollow structures have been regarded as a promising kind of advanced catalysts for energy conversion owing to their large specific surface, increased active sites, and shortened paths of charge transfer. Herein, a series of double-shelled transition metal chalcogenides (Ni-Co-MoSx, Co-MoSx, and Ni-MoSx) with ball-in-ball hollow structures have been synthesized by converting corresponding metal-glycerol spherical precursor with the assistance of (NH4)(2)MoS4 under a facile solvothermal condition. In this process, (NH4)(2)MoS4 acted as a multifunctional vulcanizator, which could conveniently afford Mo and S elements at the same time, and the mass ratio of the precursor to (NH4)(2)MoS4 played an indispensable role in preparing the uniform hollow sphere with satisfactory morphology and catalytic performance. Noteworthily, compared with ternary Co-MoSx and Ni-MoSx, the quaternary Ni-Co-MoSx ball-in-ball nanospheres demonstrated much enhanced catalytic properties in accelerating the reduction of triiodide in dyesensitized solar cells (DSSCs) and the electrochemical hydrogen evolution reactions (HERs) due to the advantages of multi-elements, moderated surface texture, and larger surface area. Specifically, a prominent power conversion efficiency of 9.63% was achieved by the DSSC assembled with Ni-Co-MoSx counter electrode (CE), which was much superior to that of Pt CE (8.28%). Besides, Ni-Co-MoSx showed a low eta(10) of 93.4 mV and a small Tafel slope of 55.0 mV dec(-1) when employed as electrocatalysts for HER in 0.5M H2SO4.
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