Enhanced electrocatalytic activity of vacuum thermal evaporated CuxS counter electrode for quantum dot-sensitized solar cells
Enhanced electrocatalytic activity of vacuum thermal evaporated CuxS counter electrode for quantum dot-sensitized solar cells
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增强量子点敏化太阳能电池真空热蒸发 CuxS 对电极的电催化活性
DOI：
10.1016/j.electacta.2014.12.089
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发表时间：
2015-02
影响因子：
6.6
通讯作者：
Zhu, Jun
中科院分区：
文献类型：
--
作者：
Tao, Ruhua;Zhang, Qingli;Hu, Linhua;Zhu, Jun
研究了在掺氟氧化锡衬底上真空热蒸发CuxS（VTE-CuxS）薄膜作为多硫化物电解质量子点敏化太阳能电池（QDSC）的对电极。QDSC的光伏参数与CuxS薄膜的退火时间有明显的依赖关系，当VTE-CuxS-300 s CE在270 °C退火300 s时，在1个太阳光照下（100 mW cm−2，AM 1.5 G）获得最大的功率转换效率为3.16 ± 0.05%。采用电化学阻抗谱、Tafel极化和循环伏安法研究了VTE-CuxS-300 s CE的电催化活性。VTE-CuxS-300 s CE的电催化活性远高于Pt CE，略高于黄铜片上原位制备的Cu 2S CE。特别是VTE-CuxS-300 s CE在多硫化物电解液中保持了较高的S2-/Sn 2-扩散速度，其电催化活性的稳定性明显优于Pt和Pt-Cu 2S CE。
Vacuum thermal evaporated CuxS (VTE-CuxS) film on fluorine-doped tin oxide substrate has been investigated as counter electrode (CE) for quantum dot-sensitized solar cells (QDSCs) with polysulfide electrolyte. The photovoltaic parameters of QDSCs show an obvious dependence on the annealing time of CuxS film, and the maximum power conversion efficiency of 3.16 ± 0.05% under one sun illumination (100 mW cm−2, AM 1.5 G) was obtained when the VTE-CuxS CE was annealed at 270 °C for 300 s (VTE-CuxS-300s CE). Electrochemical impedance spectroscopy, Tafel polarization, and cyclic voltammetry measurements have been employed to investigate the electrocatalytic activity of VTE-CuxS-300s CE. The electrocatalytic activity of the VTE-CuxS-300s CE is much higher than that of Pt CE, and is slightly higher than that of Cu2S CE in situ prepared on brass sheet. In particular, VTE-CuxS-300s CE holds high diffusion velocity of S2−/Sn2−in polysulfide electrolyte, and the stability of its electrocatalytic activity in polysulfide electrolyte is better than that of Pt and Brass-Cu2S CEs obviously.
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