A rhodium-decorated carbon nanotube cathode material in the dye-sensitized solar cell: Conversion efficiency reached to 11%

被引:28
作者
Mousavi, Farimah [1 ]
Shamsipur, Mojtaba [1 ]
Taherpour, Avat [1 ,2 ]
Pashabadi, Afshin [1 ]
机构
[1] Razi Univ, Fac Chem, Kermanshah 6714967346, Iran
[2] Kermanshah Univ Med Sci, Med Biol Res Ctr, Kermanshah, Iran
关键词
Dye-sensitized solar cell; Rhodium nanopartides; Carbon nanotubes; Electrodeposition; Density functional theory; omega B97X-D; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; COUNTER ELECTRODE MATERIAL; TUNGSTEN CARBIDE; CHARGE-TRANSPORT; GRAPHENE; PERFORMANCE; FABRICATION; IODINE; DEPOSITION; NANOSHEETS;
D O I
10.1016/j.electacta.2019.03.224
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
This work reports on the successful exploitation of a nanocomposite comprising HO-functionalized multi-walled carbon nanotubes decorated with electrochemically-grown rhodium nanoparticles (MWCNT-OH/Rh) as a cathode material in dye-sensitized solar cells (DSCs). Electrochemical investigations represent a large electroactive surface area, 0.547 cm(2), for the nanocomposite electrode, which is 7.5 times more than the exposed geometric one. The electrochemical impedance spectroscopy (EIS) discloses a 14-time smaller charge-transfer resistance (R-CT) at the nanocomposite electrode compared to the bare electrode. Furthermore, the computational calculation performed by dispersion-corrected density functional theory (DFT-D) signifies that the proposed nanocomposite contains the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), and the bandgap energy values of -6.77, -5.84, and 0.93 eV, respectively, suggesting the high conductivity for the nanocomposite. Based on the calculation results, the manuscript discusses the main charge-transfer mechanism of this device. Under the standard condition, consists of Air Mass 1.5 (AM 1.5) illumination at 100 mW cm(2), the DSC equipped by N719-sensitized TiO2 photoanode and the nanocomposite counter electrode shows significant improvements in photovoltaic parameters including short-circuit current density (J(SC)), power-conversion efficiency (PCE), and incident photon-to-current conversion efficiency (IPCE) as 27.29 mA cm(-2), 11%, and 85%, respectively. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:373 / 383
页数:11
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