Journal
JOURNAL OF POWER SOURCES
Volume 369, Issue -, Pages 35-41Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.09.080
Keywords
Cobalt iron selenides; Cobalt iron sulfides; Porous nanocubes; Photovoltaic performances; Counter electrodes; Dye-sensitized solar cells
Funding
- National Natural Science Foundation of China [21676057, 21702031]
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A novel series of ternary compounds, namely cobalt iron selenide/sulfide nanocubes, are successfully synthesized as counter electrode (CE) materials for dye-sensitized solar cells (DSSCs), which deliver excellent performances. Homogeneous cobalt iron Prussian-blue-analog (PBA) nanocubes are prepared as the templates and are subsequently dealt with selenation/sulfidation processes via hydrothermal methods. Owing to their unique morphology, porous structure, high surface area, small charge transfer resistance and high diffusion coefficient, the Co-Fe-Se/S nanocubes possess high catalytic activity and excellent conductivity, which are tested and verified by electrochemical measurements. Meanwhile, cobalt iron selenide/sulfide nanocubes CEs achieve high efficiencies of 9.58% and 9.06%, respectively, which are both higher than that of Pt CE (8.16%). All these prominent merits make them outstanding and promising participants among Pt-free CE materials of DSSCs with lower production costs and higher power conversion efficiency. (C) 2017 Elsevier B.V. All rights reserved.
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