One-Step Hydrothermal Tailoring of NiCo2S4 Nanostructures on Conducting Oxide Substrates as an Efficient Counter Electrode in Dye-Sensitized Solar Cells

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Si Yun Khoo
  • Jianwei Miao
  • Hong Bin Yang
  • Ziming He
  • Kam Chew Leong
  • Timothy Thatt Yang Tan

Detail(s)

Original languageEnglish
Article number1500384
Journal / PublicationAdvanced Materials Interfaces
Volume2
Issue number18
Publication statusPublished - 14 Dec 2015
Externally publishedYes

Abstract

A one-step in situ tailoring of NiCo<sub>2</sub>S<sub>4</sub> nanostructures is demonstrated on fluorine-doped tin oxide (FTO) as Pt-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) with performance surpassing that of a conventional Pt-sputtered CE. An interconnected NiCo<sub>2</sub>S<sub>4</sub> nanosheet network is successfully constructed on the FTO glass via a hydrothermal method, attributed to the synergistic effect of structure-directing hexamethylenetetramine and L-cysteine. A growth mechanism is proposed, and the effects of nanostructures and sulfur atomic percentages on the electrocatalytic performance are discussed in depth. A DSSC with the optimized interconnected NiCo<sub>2</sub>S<sub>4</sub> nanosheet CE exhibits higher power conversion efficiency (7.22%) compared to that with a conventional Pt-sputtered CE (6.87%) due to excellent charge transport properties and enhanced electrocatalytic activity of the NiCo<sub>2</sub>S<sub>4</sub> nanostructures. This work showcases the strong potential of nanostructured ternary chalcogenides, which are composed of earth-abundant elements and prepared through a single-step hydrothermal process without tedious posttreatments, to reduce the dependence of platinum in DSSCs and other electrochemical devices. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • counter electrodes, dye-sensitized solar cells, electrocatalytic activities, nanostructures, NiCo2S4

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Citation Format(s)

One-Step Hydrothermal Tailoring of NiCo2S4 Nanostructures on Conducting Oxide Substrates as an Efficient Counter Electrode in Dye-Sensitized Solar Cells. / Khoo, Si Yun; Miao, Jianwei; Yang, Hong Bin et al.
In: Advanced Materials Interfaces, Vol. 2, No. 18, 1500384, 14.12.2015.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review