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Issue 15, 2018
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Encapsulating CoS2–CoSe2 heterostructured nanocrystals in N-doped carbon nanocubes as highly efficient counter electrodes for dye-sensitized solar cells

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Abstract

Designing low-cost electrocatalysts combining the features of outstanding catalytic activity, excellent electrical conductivity, and high chemical stability remains a critical challenge for the large-scale fabrication of dye-sensitized solar cells (DSSCs). Here we report the controlled synthesis of CoS2–CoSe2 heterostructured nanocrystals encapsulated in N-doped carbon hollow nanocubes (CoS2–CoSe2@NC) through simultaneous sulfurization and selenization of polydopamine coated Prussian blue analogs. Benefiting from both structural and compositional characteristics, namely, the synergistic effect of CoS2–CoSe2 heterojunctions, the conductive N-doped carbon coating and the porous structure of the nanocubes, the resultant CoS2–CoSe2@NC nanocubes exhibit excellent electrocatalytic activity and cycling stability toward the generation of I3 ions in DSSCs. A typical device achieves a high power conversion efficiency (PCE) of 8.45% under AM1.5G illumination (100 mW cm−2), superior to that of a standard Pt-based device (8.07%). These results demonstrate that the as-synthesized CoS2–CoSe2@NC nanocubes are promising alternatives to Pt in DSSCs. The work represented here not only provides a promising strategy to design efficient and robust CE catalysts, but also can be extended for synthesizing other novel metal sulfide/selenide hybrid materials for applications in the fields of energy conversion and storage.

Graphical abstract: Encapsulating CoS2–CoSe2 heterostructured nanocrystals in N-doped carbon nanocubes as highly efficient counter electrodes for dye-sensitized solar cells

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Publication details

The article was received on 07 Jan 2018, accepted on 24 Feb 2018 and first published on 26 Feb 2018


Article type: Paper
DOI: 10.1039/C8DT00067K
Citation: Dalton Trans., 2018,47, 5236-5244
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    Encapsulating CoS2–CoSe2 heterostructured nanocrystals in N-doped carbon nanocubes as highly efficient counter electrodes for dye-sensitized solar cells

    S. Huang, H. Wang, S. Wang, Z. Hu, L. Zhou, Z. Chen, Y. Jiang and X. Qian, Dalton Trans., 2018, 47, 5236
    DOI: 10.1039/C8DT00067K

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