Preparation of highly electroactive cobalt sulfide core-shell nanosheets as counter electrodes for CdZnSSe nanostructure-sensitized solar cells
Resource
SOLAR ENERGY MATERIALS AND SOLAR CELLS, 95(10), 2867-2873
Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Journal Volume
95
Journal Issue
10
Pages
2867-2873
Date Issued
2011
Date
2011
Author(s)
Abstract
A facile method for the synthesis of Co3S4 coreshell hexagonal nanosheets (NSs) from Co(NO3)2 and thioacetamide under alkaline conditions in the presence of poly(vinylpyrrolidone) has been demonstrated. At the molar ratios of thioacetamide/Co2 of 0.26, 0.52, and 2.6, we prepared hollow-, semi-hollow, and non-hollow Co3S 4 coreshell hexagonal NSs. We have found that Ostwald ripening occurring at the core/shell interface accounts for the formation of the hollow Co3S4 coreshell NSs, each consisting of a core of 80±30 nm in diameter and a shell of 25±5 nm in thickness. Three CdZnSSe nanostructure-sensitized solar cells incorporating Co3S 4 NSs provide an average power conversion efficiency of 3.7±0.1%, showing high electrocatalytic activity of the Co 3S4 NSs toward polysulfide electrolyte. © 2011 Elsevier B.V. All rights reserved.
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journal article
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