Open AccessCoral-Like CoSe2-Nitrogen-Doped Porous Carbon as Efficient Counter Electrodes for Quantum Dot Sensitized Solar Cells
Author(s) -
Wenhua Li,
Zheng Meng,
Zizun Tian,
Guoqiang Long,
Shule Zhang,
Qianqiao Chen,
Qin Zhong
Publication year - 2021
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/abe97d
Subject(s) - materials science , dielectric spectroscopy , zeolitic imidazolate framework , chemical engineering , carbonization , calcination , electrode , scanning electron microscope , carbon fibers , electrocatalyst , catalysis , nanotechnology , electrochemistry , metal organic framework , composite material , adsorption , organic chemistry , chemistry , composite number , engineering
Exploration of counter electrode (CE) catalysts with excellent reduction activity to S n 2− and low charge transfer resistance ( R ct ) is always a major challenge for the development of quantum dot sensitized solar cells. In this work, coral-like CoSe 2 - nitrogen-doped porous carbon hydrides (CoSe 2 -NC) were successfully prepared by two-step calcination of zeolitic imidazolate framework (ZIF), including carbonization and selenization process. Scanning electron microscopy shows that the CoSe 2 -NC catalyst presents a coral-like microscopic morphology composed of nanospheres. Electrochemical impedance spectroscopy displays that the CoSe 2 -NC CE presents a low R ct of 1.04 Ω. The PCE of the QDSSC based CoSe 2 -NC CE is up to 5.06%which is 26%, 87% higher than those of CoSe 2 and NC CEs. The enhanced photovoltaic performance is attributed to the unique coral-like structure and the synergistic catalytic effect of CoSe 2 and NC.