Ultrathin layered MoS2 and N-doped graphene quantum dots (N-GQDs) anchored reduced graphene oxide (rGO) nanocomposite-based counter electrode for dye-sensitized solar cells

被引:77
作者
Silambarasan, K. [1 ]
Harish, S. [1 ]
Hara, K. [3 ,4 ]
Archana, J. [1 ]
Navaneethan, M. [1 ,2 ]
机构
[1] SRM Inst Sci & Technol, Dept Phys & Nanotechnol, Funct Mat & Energy Devices Lab, Kattankulathur 603203, India
[2] SRM Inst Sci & Technol, Fac Engn & Technol, Nanotechnol Res Ctr NRC, Kattankulathur 603203, India
[3] Shizuoka Univ, Elect Res Inst, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328011, Japan
[4] Shizuoka Univ, Grad Sch Sci & Technol, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328011, Japan
关键词
DSSCs; MoS2; Cyclic voltammetry; Photovoltaic; Graphene quantum dot; HIGH CATALYTIC-ACTIVITY; TRIIODIDE REDUCTION; PERFORMANCE; ELECTROCHEMISTRY; FABRICATION; COMPOSITES; HYBRID; ACID; EDGE;
D O I
10.1016/j.carbon.2021.01.162
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Numerous inorganic and organic counter electrodes (CEs) have been fabricated for dye-sensitized solar cells (DSSCs) instead of platinum (Pt) CE. However, MoS2 and carbon nanocomposite have played an important role in CEs due to their superior electrochemical properties and high chemical stability. N-doped graphene quantum dot (N-GQD) @ MoS2 @ reduced graphene oxide (rGO) nanocomposite was synthesized by the two-step hydrothermal method. The morphology of as-synthesized nanocomposites was studied using field emission scanning electron microscope (FE-SEM) and scanning transmission electron microscopy (STEM). It confirms the formation of sphere-like MoS2 composed of nanosheets on the surface of rGO sheets. The N-GQD@MoS2@rGO composites confirmed the presence of MoS2, rGO, and N-GQD by X-ray diffraction (XRD) and Raman spectra. The chemical composition and purity of N-GQD@MoS2@rGO was examined by the X-ray photoelectron spectroscopy analysis technique. The electrochemical property of the as-fabricated CEs was studied by cyclic voltammetry (CV) analysis by using the iodine-based electrolyte. The N-GQD@MoS2@rGO shows the superior catalytic property due to more electrochemical active site and electrical conductivity property of rGO and MoS2. The DSSCs device assembled with as-fabricated CEs and their photovoltaic power conversion efficiency (eta) of MoS2 was 2.01%, MoS2@rGO was 3.92%, N-GQD@MoS2 was 3.53%, N-GQD@MoS2@rGO was 4.65%, and Pt was 5.17%. (C) 2021 Elsevier Ltd. All rights reserved.
引用
收藏
页码:107 / 117
页数:11
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