Journal
ELECTROCHIMICA ACTA
Volume 291, Issue -, Pages 114-123Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.08.135
Keywords
Dye-sensitized solar cells; Alloy counter electrodes; Polyaniline; Hybrid materials; Electrocatalysts
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Funding
- National Natural Science Foundation of China [21503202, 61774139]
- Director Foundation from Qingdao National Laboratory for Marine Science and Technology [QNLM201702]
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Developing efficient and cost-effective counter electrodes (CEs) to catalyze triiodide reduction reaction is a persistent objective for high-performance dye-sensitized solar cells (DSSCs). One promising solution is to design electron-enriched electrode materials by combining conductive polymers with alloys. In this work, ternary hybrid PtM@polyaniline (M = Ni, FeNi) CEs are synthesized by one-step replacement reaction and in-situ polymerization reaction. When assembling into liquid-junction DSSCs, the power conversion efficiencies of 8.52% and 8.39% for the devices tailored with PtNi@polyaniline and PtFeNi@polyaniline CEs can be obtained. The experimental results demonstrate that the enhanced photovoltaic performances are mainly attributed to matching work function and high electrocatalytic activity of these well-designed hybrid CEs. Arising from the competitive reactions between transition metal and I-2/I-3(-) species, the dissolution reaction of Pt in liquid electrolyte is restricted and therefore the long-term stability of corresponding devices are significantly enhanced. (C) 2018 Elsevier Ltd. All rights reserved.
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