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Metal Selenides as a New Class of Electrocatalysts for Quantum Dot-Sensitized Solar Cells: A Tale of Cu1.8Se and PbSe

Title
Metal Selenides as a New Class of Electrocatalysts for Quantum Dot-Sensitized Solar Cells: A Tale of Cu1.8Se and PbSe
Author
방진호
Keywords
counter electrode; metal selenides; polysulfide electrolyte; Pt corrosion; electrocatalytic activity; COUNTER ELECTRODE; HIGH-EFFICIENCY; HIERARCHICAL MICROSPHERES; CHARGE-TRANSFER; CARBON-BLACK; COMPOSITE; CDS/CDSE; HETEROSTRUCTURE; STABILITY; NANOTUBE
Issue Date
2014-02
Publisher
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Citation
ACS APPLIED MATERIALS & INTERFACES, 권: 6, 호: 4, 페이지: 2335-2343
Abstract
The development of a Pt-free, highly active electrocatalyst for a counter electrode (CE) is vital to the construction of highly efficient quantum dot-sensitized solar cells (QDSSCs). As an alternative to Pt, the use of various metal sulfides, such as Cu2S, CoS, and PbS, has been successfully demonstrated; however, the studies on the utilization of nonsulfide materials have been scarcely reported. In this regard, we examined eight different types of binary metal selenides as new candidate materials, and found that the electrocatalytic activity of Cu1.8Se and PbSe toward polysulfide reduction was superior to that of Pt. In depth investigation into these two material's further revealed that, while the electrocatalytic activity of both metal selenides surpasses that of Pt, the long-term utilization of the PbSe CE is hindered by the formation of PbO on the surface of PbSe, which is attributed to the instability of PbSe under air. Unlike PbSe, Cu1.8Se was found to be chemically stable with a polysulfide electrolyte and was even better than Cu2S, a commonly used CE material for QDSSCs. Using the Cu1.8Se CE, we obtained a power conversion efficiency of 5.0% for CdS/CdSe-sensitized solar cells, which was an efficiency almost twice that obtained from Pt CE. This work provides a new application for metal selenides, which have been traditionally utilized as sensitizers for QDSSCs.
URI
https://pubs.acs.org/doi/10.1021/am404355mhttp://hdl.handle.net/20.500.11754/47761
ISSN
1944-8244
DOI
10.1021/am404355m
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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