材料科学
量子点
多硫化物
电解质
复合数
辅助电极
纳米颗粒
电极
化学工程
电导率
硒化物
纳米技术
热液循环
复合材料
冶金
化学
物理化学
硒
工程类
作者
Yifan Chen,Dejun Wang,Yanhong Lin,Xiaoxin Zou,Tengfeng Xie
标识
DOI:10.1016/j.electacta.2019.05.132
摘要
This paper reports a one-step hydrothermal method of in-situ growing copper selenide (CuSe) nanoparticles on the 2D materials-MXene (Ti3C2) nanosheets to form CuSe/Ti3C2 composite with three-dimensional structure. The CuSe/Ti3C2 slurry prepared via a solvothermal method was screen-printied onto graphite sheet to form a counter electrode (CE) in quantum dot-sensitized solar cells (QDSCs). The CuSe/Ti3C2 CE shows the better electrical conductivity for electron transfer, and a larger specific surface area to provide more active sites for polysulfide electrolyte reduction, as compared to the pristine CuSe CE and Ti3C2 CE. Hence, the device with CuSe/Ti3C2-30 mg CE achieves an efficiencies of 5.12%, which much better than that of CuSe CE (3.47%) and Ti3C2 CE (2.04%). The symmetrical dummy cells consisting of two CEs are further designed to confirm the best electrocatalytic activity and the excellent stability of composite CE towards polysulfide electrolyte. Therefore, CuSe/Ti3C2 is very promising as CE for QDSCs and this strategy provides a facile route for the design of the composite with MXene as a CE for QDSCs.
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