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Double-walled heterostructured Cu2-xSe/Cu7S4 nanoboxes with enhanced electrocatalytic activity for quantum dot sensitized solar cells

Abstract

It is of great importance to develop counter electrodes (CEs) alternative for enhancing power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSSCs). Here, single-walled Cu7S4 nanoboxes (SW-Cu7S4-NBs) and double-walled heterostructured Cu2-xSe/Cu7S4 nanoboxes (DW-Cu2-xSe/Cu7S4-HNBs) are synthesized by a facile in-situ inward etching/sacrificial template method based on Kirkendall effect. The remarkably enhanced and stable electrocatalytic activity is achieved for QDSSC based on DW-Cu2-xSe/Cu7S4-HNBs CE, which is inclusively derived from high intrinsic electron conductivity of Cu2-xSe, the stimulative electron transfer process and abundant active catalytic sites due to the enlarged specific surface area, higher utilization efficiency of incident light of unique double-walled hollow structure, and the formation of heterogeneous nanostructure. As a result, the QDSSC based on DW-Cu2-xSe/Cu7S4-HNBs CE exhibits a PCE of 4.38% under 1 sun (100 mW·cm-2) irradiation, and 3.97%, 3.43% and 1.54% for SW-Cu7S4-NBs, Pt and the brass/Cu2S based CE, respectively. Furthermore, it is suggested that DW-Cu2-xSe/Cu7S4-HNBs CE still shows a superior long-term stability towards the polysulfide electrolyte even after 600 cycles.

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Supplementary files

Publication details

The article was received on 15 Jun 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7CE01112A
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Double-walled heterostructured Cu2-xSe/Cu7S4 nanoboxes with enhanced electrocatalytic activity for quantum dot sensitized solar cells

    L. Ran and L. Yin, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01112A

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